研究者総覧

井上 幹生 (イノウエ ミキオ)

  • 大学院理工学研究科 環境機能科学専攻 教授
Last Updated :2020/11/10

研究者情報

学位

  • 博士(農学)(北海道大学)
  • 修士(農学)(北海道大学)

科研費研究者番号

  • 10294787

J-Global ID

研究キーワード

  • 河川生態学   Stream Ecology   

研究分野

  • ライフサイエンス / 生態学、環境学

経歴

  • 2006年  - 愛媛大学大学院理工学研究科
  • 1995年 - 1997年  北海道大学大学院農学研究科
  • 1997年  - 愛媛大学理学部

学歴

  •         - 1997年   北海道大学   大学院農学研究科   林学専攻
  •         - 1997年   北海道大学   Graduate School, Division of Agriculture
  •         - 1992年   北海道大学   農学部   林学科
  •         - 1992年   北海道大学   Faculty of Agriculture

所属学協会

  • 日本魚類学会   応用生態工学会   日本森林学会   

研究活動情報

論文

  • 重信川で発生した記録的出水に対する底生無脊椎動物群集および魚類群集の反応
    角田 康祐, 三宅 洋, 渡辺 裕也, 井上 幹生
    応用生態工学 22 1 35 - 49 2019年07月 [査読有り]
     研究論文(学術雑誌)
  • Contrasting effects of dams with and without reservoirs on the population density of an amphidromouos goby in southwestern Japan
    Y. Sumizaki, R. Kawanishi, M. Inoue, M. Takagi, K. Omori
    Ichthyological Research 66 3 319 - 329 2019年07月 [査読有り]
  • 小河川における生息環境計測のための横断測線間隔 —その粗さと精度—
    井上 幹生
    応用生態工学 21 93 - 107 2019年01月 [査読有り]
  • 愛媛県松山平野における湧水性水域へのマツカサガイの試験的導入
    吉見翔太郎, 井上幹生, 畑啓生
    保全生態学研究 23: 99-114 23 99 - 114 2018年07月 [査読有り]
  • 魚類の生息場所としての河床間隙水域 –河川における鉛直的つながりの重要性-
    川西亮太, 井上幹生
    地下水学会誌 60 2 157 - 167 2018年05月 [査読有り][招待有り]
     研究論文(学術雑誌)
  • Ryota Kawanishi, Ryota Dohi, Asuka Fujii, Mikio Inoue, Yo Miyake
    ICHTHYOLOGICAL RESEARCH 64 4 433 - 443 2017年11月 [査読有り]
     研究論文(学術雑誌) 
    Vertical hydrological connectivity between the surface stream and benthic and hyporheic zones plays a key ecological role in the biodiversity of lotic ecosystems because it allows surface and benthic organisms to use the hyporheic zone as a seasonal habitat and refuge. Use of the hyporheic zone by surface/benthic organisms has been well studied in invertebrates, but little is known about the importance of this connectivity for fishes. We investigated streambed surface and hyporheic densities (5-10, 15-20 and 20-25 cm below the streambed surface) of a stream fish, Cobitis shikokuensis, over a 20-month period in the Shigenobu River, southwestern Japan, to test the hypothesis that it uses the hyporheic zone for spawning and overwintering. In total, 1,804 individuals (13-58 mm total length) were captured from 33 streambed surface samplings and 102 individuals (10-46 mm total length) were present in 1,147 samples of 57 hyporheic samplings. Population densities in both zones peaked in late summer-early autumn due to the recruitment of age 0+ fish and a female with eggs was found in the hyporheic zone during the reproductive season. Both 0+ and older fish were absent from the streambed surface during winter, and fish densities were also lower in the hyporheic zone at this time. However, the vertical distribution of the fish tended to be skewed towards the deeper hyporheic layers from autumn to spring. These findings indicate that C. shikokuensis vertically migrates between the streambed surface and the hyporheic zone for spawning, rearing and overwintering, suggesting that the integrity of vertical hydrological connectivity in lotic systems is crucial for certain fish species.
  • 愛媛県松山平野におけるイシガイ科貝類個体群の衰退
    桑原明大, 松葉成生, 井上幹生, 畑啓生
    保全生態学研究 22 91 - 103 2017年06月 [査読有り]
  • 西日本におけるマーモクレブスの初記録と淡水生態系への脅威
    西川潮, 東典子, 佐々木進一, 岡智春, 井上幹生
    Cancer 26 5 - 11 2017年 [査読有り]
  • 河川水辺の国勢調査を保全に活かす―データがもつ課題と研究例
    末吉 正尚, 赤坂 卓美, 森 照貴, 石山 信雄, 川本 朋慶, 竹川 有哉, 井上 幹生, 三橋 弘宗, 河口 洋一, 鬼倉 徳雄, 三宅 洋, 片野 泉, 中村 太士
    保全生態学研究 21 2 167 - 180 2016年11月 [査読有り]
     研究論文(学術雑誌)
  • S. Ito, H. Iwao, J. Sakata, M. Inoue, K. Omori, Y. Yanagisawa
    JOURNAL OF FISH BIOLOGY 89 3 1592 - 1602 2016年09月 [査読有り]
     研究論文(学術雑誌) 
    A laboratory experiment was conducted by varying the undersurface area of nesting substratum and the number of females in an experimental tank to elucidate the determinants of the mating pattern in the stream goby, Rhinogobius sp. cross-band type. Males with larger nests tended to attract two or more females to their nest in a tank. Moreover, males spawned simultaneously with multiple females and entire brood cannibalism by males was rarely observed under a female-biased sex ratio. When males spawned with a single female with low fecundity, however, entire brood cannibalism occurred at a high frequency, suggesting that a male guarding a nest with fewer eggs consumes the brood. Therefore, spawning behaviour of females that leads to a large egg mass would decrease the risk of entire brood cannibalism. In this species, simultaneous spawning by multiple females in a nest serves as a female counter-measure against entire brood cannibalism. These results suggest that a conflict of interest between the sexes through brood cannibalism is a major determinant of simultaneous spawning.
  • Ryota Kawanishi, Ryota Dohi, Asuka Fujii, Mikio Inoue
    ECOLOGY OF FRESHWATER FISH 24 4 584 - 590 2015年10月 [査読有り]
     研究論文(学術雑誌) 
    A negative correlation between the degree of fine sediment deposition and the abundance of stream benthic fishes has often been reported, although the causal mechanisms for this effect are not fully understood. To better understand the influence of sedimentation, it is important to clarify whether it alters the habitat required by fish, or merely preferred by them. We conducted two enclosure experiments in the field to examine (i) whether an endangered benthic fish, Cobitis shikokuensis, prefers sediment-free substrate and (ii) whether fine sediment deposition has negative effects on the physiological condition of C.shikokuensis. The first experiment, which used three types of substrates, cobble', pebble' and mixture of fine sediment and pebbles', showed that C.shikokuensis avoided the mixture. The second experiment, which compared the physiological condition of fish reared in enclosures with either a pebble or mixture substrate, showed that the condition of the fish in the latter group declined more quickly. These results suggest that, for C.shikokuensis, sediment-free substrate is a habitat requirement, not merely a preference, and that excessive input of fine sediment due to human activities can cause a decline in the population of this species.
  • 藤原結花, 内田有紀, 川西亮太, 井上幹生
    応用生態工学 18 2 127 - 137 2015年 [査読有り]
     研究論文(学術雑誌) 
    In an intermittent reach of the Shigenobu River (Ehime Prefecture, southwestern Japan), two floodplain ponds (Matsubara Spring and Hirose-gasumi wetland) were created in 2006-2007 as a part of a habitat rehabilitation project. Fish assemblages and habitat characteristics of the two created ponds were investigated in 2008, and compared with those of ten pre-existing spring-fed ponds (reference ponds). Structural characteristics (canopy shade, cover habitat, substrate, and bank condition) of the two created ponds were similar to those of the reference ponds. The created ponds were characterized by lower values of water level fluctuation, indicating that the created ponds can function as stable, permanent habitats in the intermittent reach. The number of fish species in the reference ponds ranged from 4 to 14 species, while that in the two created ponds was 13 and 9. This indicates that most of the major fish species had colonized the newly created ponds, al-though total fish density in both created ponds was low relative to that in the reference ponds. Overall, our data suggest that the two ponds created by the habitat rehabilitation project provide suitable habitats for freshwater fishes. However, exotic largemouth bass (Micropterus salmoides), which can have strong negative effects on native biota, was found in a created pond (Hirose-gasumi). Management of the created ponds should include consideration of this invasive species.
  • Nobuyoshi Kotera, Mikio Inoue
    LANDSCAPE AND ECOLOGICAL ENGINEERING 11 1 119 - 128 2015年01月 [査読有り]
     研究論文(学術雑誌) 
    Habitat loss and degradation due to human activities are major threats to stream fishes. To predict and/or monitor habitat changes, quantification of suitable habitats for target fish species is indispensable. For drift-feeding salmonids, bioenergetics models that estimate energetic benefit (net energy intake: NEI) can be used for their habitat evaluation. In this study, we examined applicability of a bioenergetics model, which had been developed for Arctic grayling (Thymallus arcticus) in Alaska, North America, to habitat evaluation for red-spotted masu salmon (Oncorhynchus masou ishikawae) in southwestern Japan, by assessing whether their position choice can be predicted by the model. The results showed that the model successfully predicted their position choice in 12 of the total 16 study sections. Further, in two sections inhabited by several individuals, strong positive correlations were found between NEI potential and fish body length, being consistent with a widely reported trend in drift-feeding salmonids that larger individuals occupy more profitable positions. We concluded that the bioenergetics model we tested is useful in evaluating habitat quality for red-spotted masu salmon. Our results suggested that NEI models can be regarded as a site-independent, widely applicable tool for habitat evaluation for drift-feeding salmonids.
  • 菊地修吾, 井上幹生
    応用生態工学 17 1 17 - 28 2014年 [査読有り]
     研究論文(学術雑誌) 
    Numerous sediment-control dams are installed in most headwater catchments in Japan. These dams cause habitat fragmentation of stream-dwelling salmonids, raising the risk of local extinction of their isolated populations. We examined such an effect of habitat fragmentation due to dams on red-spotted masu salmon (Oncorhynchus masou ishikawae) in Shikoku, southwestern Japan. We hypothesized that their local extinctions would occur from uppermost reaches (uppermost margins of their distribution range), where populations are completely isolated, and then extend downstream. Our purpose was to clarify habitat size (catchment area upstream of dams) at which local extinctions becoming apparent in the present state. Classification tree analysis using presence/absence data at 69 study sites suggested that local extinctions due to dams were apparent in stream reaches at catchment area 0.49-0.89 km. In addition, regression tree analysis showed that masu salmon density increased upstream, suggesting that upper reaches have higher habitat quality. Estimations of stream length and population size based on catchment area indicated that stream reaches facing extinction threat are within 500-600 m from the headwater and have only 40-50 individuals of adult population size. Our results emphasized the priority of uppermost reaches in conservation and restoration of connectivity for populations of stream-resident salmonids. We proposed four management classes (critically endangered area: catchment area < 2 km least-required area: 4 km2 required area: 10 km2 target range: 40 km2) based on previous knowledge and the present results to facilitate conservation and restoration of the headwater connectivity.
  • 松葉成生, 吉見翔太郎, 井上幹生, 畑啓生
    魚類学雑誌 61 89 - 96 2014年 [査読有り]
  • 今田 慎太郎, 守口 祥平, 三宅 洋, 井上 幹生
    第41回環境システム研究論文発表会講演集 329 - 336 2013年10月
  • Mikio Inoue, Shogo Sakamoto, Shugo Kikuchi
    ECOLOGY OF FRESHWATER FISH 22 3 335 - 347 2013年07月 [査読有り]
     研究論文(学術雑誌) 
    Terrestrial invertebrates falling from the riparian canopy are a major energy source for fishes in headwater streams. Because quantity and quality of such allochthonous resources can vary depending on riparian conditions, conversion of riparian forests to conifer plantations may affect stream productivity. We compared falling and drifting invertebrate abundances and the diet of masu salmon (Oncorhynchus masou) among stream reaches bordered by deciduous broadleaved forests, conifer plantations (Cryptomeria japonica), and clear-cut sites in southwestern Japan. We also examined whether among-reach variation in salmon abundance was related to the riparian vegetation types. The results indicated that, on an annual basis, falling inputs of terrestrial invertebrates at the broadleaved reaches were 2-4 times higher than those at the plantation and clear-cut reaches. In nonwinter seasons, terrestrial invertebrates made up 40-60% and 30-90% of drift and masu salmon diets, respectively, and drifting invertebrate abundance was higher in the broadleaved reaches than in the plantation reaches. Furthermore, a multivariate analysis of salmon abundance showed that variation in salmon biomass was explained primarily by riparian vegetation type, with broadleaved and clear-cut reaches having higher biomass than the plantation reaches. These results indicate that terrestrial invertebrates are an important resource for masu salmon, and suggest that streams bordered by conifer plantations receive lower terrestrial prey inputs, which results in lower salmon abundance. In regions where natural forests have been extensively converted to conifer plantations, forest management that allows and facilitates recovery of natural riparian stands is important.
  • R. Kawanishi, M. Inoue, R. Dohi, A. Fujii, Y. Miyake
    AQUATIC SCIENCES 75 3 425 - 431 2013年07月 [査読有り]
     研究論文(学術雑誌) 
    In lotic systems, the hyporheic zone has been suggested as a potential refuge for aquatic organisms during disturbances (hyporheic refuge hypothesis). However, the supporting evidence is unclear, especially regarding the survival of hyporheic refugees and their contribution to the recovery of post-disturbance populations. Moreover, few studies have focused on the importance of the hyporheic refuge for aquatic vertebrates such as fish. In this study, we present evidence that the hyporheic zone acts as a refuge for a small benthic fish (Cobitis shikokuensis) following surface drying in an intermittent river. We examined its survival during and recolonization after dry periods by direct hyporheic sampling and mark-and-recapture surveys. When the streambed dried, hyporheic sampling was conducted 58 times across 33 locations in the intermittent reach and 31 individuals of C. shikokuensis were captured from extracted hyporheic water. Mark-and-recapture surveys revealed that recolonizers after re-wetting included C. shikokuensis individuals that had survived dry periods in the hyporheic refuge. The condition factor of C. shikokuensis significantly declined after dry periods, suggesting that most recolonizers suffered from physiological stress, probably within the hyporheic refuge. These results clearly support the long-debated, hyporheic refuge hypothesis, and provide a striking example of the critical role of the hyporheic zone in population maintenance of lotic organisms.
  • 高木基裕, 柴川涼平, 清水孝昭, 大森浩二, 井上幹生
    応用生態工学 16 1 13 - 22 2013年 [査読有り]
     研究論文(学術雑誌) 
    Population genetic structure of a common freshwater goby Rhinogobius fluviatilis in the Yoshino River and its tributaries was surveyed using three microsatellite loci to examine effects of dams. Allelic richness of the Akui and Sadamitsu River populations below the dams were high (15. 7, 15. 9) and that of the above the dams populations were low (10. 9 ∼13. 0). Heterozygosity was same level diversity between above and below dam populations (0. 870∼0. 890) except for Takeno river population (0. 788). Considerable genetic differences were observed between populations above and below the dams. Migratory history was also examined using otolith Sr/Ca ratio. The otolith Sr/Ca ratio analysis confirmed that the populations above the dams were landlocked by the dams. It was also suggested that some individuals below the dams do not undertake amphidromous migration.
  • 藤原結花, 内田有紀, 川西亮太, 井上幹生
    応用生態工学 16 2 91 - 105 2013年 [査読有り]
     研究論文(学術雑誌) 
    Fish assemblage structure in spring-fed irrigation ponds in the Shigenobu River watershed (Ehime Prefecture) was compared between two periods, 1998-1999 and 2008, to examine effects of revetment construction and exotic largemouth bass (Micropterus salmoides). Two of the 11 study ponds were 'altered ponds, where bank revetment was constructed during the decade, whereas another pond was 'bass pond, where largemouth bss had established a self-reproducing population. Comparisons of species richness, density of each species and assemblage structure revealed that the most distinct change occurred in the bass pond, where most species other than largemouth bass showed drastic declines in population density. On the other hand, distinct fish-assemblage changes specific to the altered ponds were not found, despite considerable habitat changes due to the revetment construction work. Our data also revealed that two species, Tanakia lanceolata and Gnatho-pogon elongatus elongatus, which had been found from six and two ponds, respectively, disappeared in 2008. These disappearances may suggest an overall degradation of irrigation-associated aquatic systems (river-pond-ditch-paddy: alternative habitats for floodplain-adapted fishes) as fish habitat.
  • Mikio Inoue, Sei-ichi Shinotou, Yusuke Maruo, Yo Miyake
    LIMNOLOGY 13 2 207 - 219 2012年08月 [査読有り]
     研究論文(学術雑誌) 
    In headwater streams, conifer plantation forestry may affect stream communities through the quantity and quality of basal resources (allochthonous litter). We compared (1) the seasonal patterns of litter input from the riparian canopy, (2) those for the abundance of benthic and drifting litter in streams, and (3) the density of litter-associated invertebrates among streams bordered by deciduous broadleaved forest, a plantation of Japanese cedar (Cryptomeria japonica), and a clear-cut site, to extract the characteristics of conifer-plantation streams in terms of litter dynamics and benthic invertebrates. The results illustrate differences in litter input and in-stream processes between the broadleaved and plantation sites, although the total annual inputs from canopy were similar. In the broadleaved site, high litter storage was limited to winter, probably because pulsed inputs of litter in autumn were retained on the streambed but rapidly processed. In contrast, litter input was more constant at the plantation site, and litter was stored throughout the year. Although the litter-patch-specific density of total invertebrates was similar between the broadleaved and plantation sites, estimates of the reach-scale, habitat-weighted density considering differences in the coverage area of litter patches revealed considerable differences. Although the habitat-weighted density of total invertebrates was lower at the plantation site than at the broadleaved site in winter, it was noticeably higher at the plantation site in summer, owing to the seasonal stability of benthic litter abundance. Our results emphasized the importance of considering the spatiotemporal availability of benthic litter when assessing the effects of conifer plantations on stream ecosystems.
  • 潮見 礼也, 三宅 洋, 上田 竜士, 井上 幹生
    土木学会論文集B1(水工学) 68 4 I_697 - I_702 2012年02月 [査読有り]
     研究論文(学術雑誌) 
    We conducted a field survey in 8 tributaries of the Shigenobu River to elucidate the influence of catchment land use on fish and invertebrate assemblages and feeding habit of fish. Fish and invertebrate assemblages were dominated by high-temperature and pollution tolerant taxa in agricultural streams. Dominant omnivorous fish, <i>Phoxinus oxycephalus jouyi</i>, selectively fed on periphyton in agricultural streams while it utilized various food items in forest streams. We concluded that changes in water temperature and nutrient concentration would generate synchronous changes in community structures of fish and invertebrates and, moreover, fish feeding, along the forest-agricultural gradient.
  • 上田 竜士, 菊地 修吾, 三宅 洋, 杉原 達也, 井上 幹生
    土木学会論文集B1(水工学) 68 4 I_691 - I_696 2012年02月 [査読有り]
     研究論文(学術雑誌) 
    The construction of erosion control dams and the alteration of riparian forest are known to have strong influences on the density of salmonid fish that dominate in mountain streams. Our objective was to elucidate the indirect effect of the dam construction and riparian alteration on stream invertebrates through the alteration of salmonid fish (<i>Oncorhynchus masou ishikawae</i>) density. The densities of two dominant invertebrate species, Baetis <i>yoshinensis</i> and Baetis <i>thermicus</i>, were low at study sites with high O. <i>masou</i> density. In conclusion, our study suggested that human activities indirectly affect stream invertebrates via changing fish abundance in mountain streams.
  • 高木基裕, 関家一平, 柴川涼平, 清水孝昭, 川西亮太, 井上幹生
    応用生態工学 15 2 161 - 170 2012年 [査読有り]
     研究論文(学術雑誌) 
    Influence of the dams in the Kamo and Nakayama River systems in the Ehime Prefecture on the common freshwater gobies Rhinogobius flumineus (non-diadromous species), R. sp. CB, R. fluviatilis and R. kurodai (amphidromous species) were surveyed using three microsatellite loci. Genetic variability was high in R. sp. CB (0. 900-0. 919) and low in R. flumineus (0.191-0. 278). Considerable genetic differences were observed among the species. The effects of a dam with a reservoir were examined for R. flumineus and R. sp. CB. In R. flumineus (non-diadromous species), genetic differences were not observed between populations above and below the Nakayama-gawa Dam (Nakayama R.). In R. sp. CB (amphidromous species), migratory history was also examined using otolith Sr/Ca ratio. The otolith Sr/Ca ratio analysis confirmed that the population above the Kurose Dam (Kamo R.) was landlocked by the dam. However, genetic heterogeneity was not observed between populations above and below the Kurose Dam.
  • Ryota Kawanishi, Mikio Inoue, Motohiro Takagi, Yo Miyake, Takaaki Shimizu
    ICHTHYOLOGICAL RESEARCH 58 3 202 - 208 2011年07月 [査読有り]
     研究論文(学術雑誌) 
    We examined habitat factors related to the distribution and abundance of the spinous loach Cobitis shikokuensis, an endangered benthic fish, in the Shigenobu River system, southwestern Japan. In the study river, the spinous loach was distributed widely along the main stem, from headwater to near the mouth, whereas it was rarely found in tributary streams. Classification tree analysis showed that the presence/absence of spinous loach was explained by a combination of percent pebble and length of river fragment between artificial barriers. Spinous loach incidence was high in sites with abundant pebble (> 27.7%), but low in sites with short river fragment (a parts per thousand currency sign0.97 km) even if pebbles were abundant. A regression tree model for loach density retained only percent pebble as a single best predictor, with sites with higher percent pebble (> 40.4%) having higher density. These results suggest that substrate condition is an important factor determining the distribution and abundance of spinous loach and also that habitat fragmentation by artificial barriers has great potential to threaten the spinous loach population in this river. Considering the highly fragmented situation of the study river and prevention of upstream migration by barriers, we conclude that maintenance of suitable habitats in upper reaches has high priority for conservation of the spinous loach.
  • Mayu Hisabae, Shin Sone, Mikio Inoue
    JOURNAL OF FOREST RESEARCH 16 2 108 - 115 2011年04月 [査読有り]
     研究論文(学術雑誌) 
    Breakdown and macroinvertebrate colonization of conifer needles (Cryptomeria japonica) and deciduous broadleaves (Euptelea polyandra) were investigated using litter bags in two study sites in streams flowing through a conifer plantation of C. japonica in Shikoku, southwestern Japan (one site with conifer canopy and another with mixed conifer and broadleaved canopy). Breakdown rates and macroinvertebrate densities were compared between litter species (conifer needle vs broadleaf) and between the two sites (conifer vs mixed canopy) to determine (1) whether breakdown rate of broadleaves is higher than conifer needles, (2) whether macroinvertebrates prefer broadleaves to conifer needles, and (3) whether the difference in riparian canopy is reflected in macroinvertebrate abundance. The results indicated that breakdown rates of broadleaves were higher than those of conifer needles, suggesting poorer quality of the latter as food for macroinvertebrates. Differences in macroinvertebrate density between needles and broadleaves were generally consistent with those in breakdown rates: broadleaves tended to have higher densities than needles, suggesting that conifer needles were not preferred by macroinvertebrates. However, total macroinvertebrate density in the conifer site was not significantly different from that in the mixed site, although the dominant shredder taxon differed (conifer site: gammarids; mixed site: lepidostomatids). Although conifer needles are low-quality food for macroinvertebrates, this may offer some advantages. Conifer needles remain on the streambed for longer periods owing to their lower breakdown rates, being a constantly available resource. In addition, accumulations of conifer litter may effectively trap and retain particulate organic matter.
  • 高木基裕, 矢野諭, 柴川涼平, 清水孝昭, 大原健一, 角崎嘉史, 川西亮太
    応用生態工学 14 1 35 - 44 2011年 [査読有り]
     研究論文(学術雑誌) 
    Population genetic structure and migratory history of the common freshwater goby Rhinogobius sp. LD in the Shigenobu River system were surveyed by using three microsatellite loci and otolith Sr /Ca ratio, to examine effects of two types of dams, a single dam with a reservoir (Ishite-gawa Dam) and multiple erosion-control dams without reservoir. Genetic variabilities were high in the Shigenobu River populations and the estimated hetero zygosity ranged from 0.843 to 0.889. Considerable genetic differences were observed between populations above Ishite-gawa Dam (two sites) and populations of the other nine sites (above multiple erosion-control dams), within which the genetic heterogeneity was not observed. These results suggested that the populations above Ishite-gawa Dam were landlocked and differentiated genetically by the dam, whereas the goby populations were not isolated by multiple erosion-control dams. This was supported by the otolith Sr /Ca analysis, which indicated that the goby individuals sampled from the sites above the Ishitegawa Dam had not experienced saltwater whereas those above multiple erosion-control dams had experienced. In addition, Sr /Ca analysis suggested that a population just below the Ishitegawa Dam consisted of both landlocked (drifted from the reservoir) and sea-migratory individuals.
  • Ryota Kawanishi, Yuta Kudo, Mikio Inoue
    ECOLOGICAL RESEARCH 25 4 837 - 845 2010年07月 [査読有り]
     研究論文(学術雑誌) 
    We examined habitat use by spinous loach (Cobitis shikokuensis), an endangered benthic fish in Japan, in relation to distance to the stream bank, water depth, current velocity, substrate types and bed-subsurface conditions (fine-sediment volume, vertical hydraulic gradient). In the study reach (Shigenobu River in Shikoku Island), spinous loach exhibited a patchy distribution within the channel, being limited to sloping bed of channel margins. Although high selectivities were detected for three variables (close to the stream bank, pebble-dominant substrates, and low fine-sediment volume) from univariate perspective, decision-tree analysis indicated that their distribution pattern was best explained by the two variables representing subsurface conditions. Locations occupied by spinous loach were characterized by extremely low fine-sediment volume (a parts per thousand currency sign1.5%), or by moderate fine-sediment volume (1.5-9.8%) with positive vertical hydraulic gradient (indicative of upwelling). Our results suggest that subsurface interstices are essential habitat for spinous loach and that prevention of excessive inputs and deposition of fine sediments, which cause interstitial sedimentation, is crucial for conservation of this endangered species.
  • Yuki Uchida, Mikio Inoue
    FRESHWATER BIOLOGY 55 5 983 - 994 2010年05月 [査読有り]
     研究論文(学術雑誌) 
    1. Species richness in a habitat patch is determined by immigration (regional) and extinction (local) processes, and understanding their relative importance is crucial for conservation of biodiversity. In this study, we applied the Island Biogeography concept to spring ponds connected to a river in southwestern Japan to examine how immigration and extinction processes interact to determine fish species richness in temporally variable environments. 2. Fish censuses were conducted 15 times in 13 study ponds at 1-4 month intervals from August 1998 through October 2000. Effects of habitat size (pond area), isolation (distance from the river) and temporal environmental variability (water level fluctuation) on (i) species richness, (ii) immigration and extinction rates and (iii) population size and persistence of each fish species were assessed. 3. The results revealed predominant effects of distance on species richness, immigration/extinction rates and population size and persistence. Species richness decreased with increasing distance but was not related to either pond area or water level fluctuation. A negative effect of distance on immigration rate was detected, while neither pond area nor water level fluctuation had significant effects on extinction rate. Further, population size and persistence of four species increased with decreasing distance, suggesting that, in ponds close to the river, immigrants from the river reduce the probability of extinction (i. e. provide a rescue effect), contributing to the maintenance of high species richness. 4. Overall results emphasise the importance of immigration processes, rather than extinction, in shaping patterns of species richness in our system. The predominant importance of immigration was probably because of (i) high temporal variability that negates habitat-size effects and (ii) continuous immigration that easily compensates for local extinctions. Our results suggest that consideration of regional factors (e. g. connectivity, locations of source populations and barriers to colonisation) is crucial for conservation and restoration of local habitats.
  • Mikio Inoue, Hiroshi Miyata, Yousuke Tange, Yoshinori Taniguchi
    CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES 66 9 1423 - 1434 2009年09月 [査読有り]
     研究論文(学術雑誌) 
    Factors controlling invasion success of rainbow trout (Oncorhynchus mykiss) and interactions with native masu salmon (Oncorhynchus masou) were examined by field investigations. The results suggested that flow regime has a major role in controlling rainbow trout invasion success. Although competitive relationships were found between the two species, masu salmon were not likely to prevent trout invasion. Analyses on the distributions and abundances of the two species indicated that the occurrence of rainbow trout was limited to streams with stable flows, and the density of each species was negatively related with that of the other. Habitat use and diet analyses revealed a pattern of their resource partitioning; rainbow trout occupy positions near the bottom or cover, foraging benthic prey, while masu salmon feed drifting prey at the middle layers of the water column. This resource partitioning was suggested to reflect a diet shift by rainbow trout. Our results also have a management implication that dams, which control flow regime, can be a key factor in managing rainbow trout invasion and its effects.
  • 中野 裕, 土肥 唱吾, 峰松 勇二, 井上 幹生, 三宅 洋
    土木学会環境システム研究論文集 36 445 - 455 2008年 [査読有り]
  • 宮田 浩, 國本 昌宏, 井上 幹生
    応用生態工学会応用生態工学 10 2 117 - 129 2007年 [査読有り]
     研究論文(学術雑誌) 
    Exotic largemouth bass (Micropterus salmoides) and bluegill (Lepomis macrochirus), both of which were introduced from North America, are now widespread throughout Japan, often dominating in irrigation ponds and reservoirs. The rapid expansions of their distributions beyond watersheds are obviously due to human agency however, their expansions within a watershed may be, more or less, attributable to natural dispersal, which has rarely been investigated. This study presents circumstantial evidence of their dispersal from artificial ponds to irrigation ditches. In the Shigenobu River watershed (Ehime Prefecture, southwestern Japan), 21 study sites were established in river pools and irrigation ditches associated with 6 ponds inhabited by the two species. In each site, population densities of both species were monitored from the spring of 2002 to the autumn of 2003. The monitoring showed that (1) both species attained high densities (maximum density, 8.0 and 12.1 individuals/m2 for largemouth bass and bluegill, respectively) in ditches just downstream of ponds in summer, (2) most of them were small in size (< 10 cm in fork length), (3) at every study site, their densities were temporarily variable and zero densities were often recorded (i. E., neither of the two species was found), and (4) the two exotic species comprised considerable percentages of fish assemblages in the ditches (41.9 % in the sum total of estimated number of fishes). These results, in combination with a fact that most study ditches had potential barriers to upstream migration (i. E., falls of 0.8-2 m in height), suggest that individuals of both species in the ditches were immigrants from the ponds. © 2007, Ecology and Civil Engineering Society. All rights reserved.
  • Sayaka Ito, Hidekazu Koike, Koji Omori, Mikio Inoue
    ICHTHYOLOGICAL RESEARCH 53 3 301 - 305 2006年08月 [査読有り]
     研究論文(学術雑誌) 
    Tolerance to current velocity was compared among six stream gobies of the genus Rhinogobius (cross-band, dark, large-dark, cobalt, and orange types, and R. flumineus). Each individual of the six gobies was exposed to incremental increases in current velocity within a laboratory flume. The current velocity at which each individual was dislodged was recorded and compared by species. Results from comparisons showed that the tolerance of gobies declined in the following order: cobalt, large-dark, dark, cross-band, R. flumineus, and orange type. This interspecific difference in velocity tolerance is consistent with their habitat segregation patterns as previously reported by field observations.
  • Mikio Inoue, Masanobu Miyayoshi
    OIKOS 114 1 95 - 107 2006年07月 [査読有り]
     研究論文(学術雑誌) 
    in streams, physical and biotic conditions change from the headwaters to the mouth, shaping longitudinal patterns in community structure. We examined how fish foraging effects on periphyton and benthic invertebrates changed along a longitudinal gradient of a warm-temperate stream in southwestern Japan. We established three study sites according to changes in the composition of fish feeding guilds (upper site characterized by drifting-invertebrate feeders, Oncorhynchus mason; middle site by benthic invertebrate feeders, Rhinogobius spp.; lower site by the presence of periphyton grazers, Sicyopterus japonicus), and performed two manipulative experiments to examine effects of different fish assemblages on periphyton and benthic invertebrate abundances. Results of an exclosure experiment suggested that fishes had no effect on the benthic assemblages at the upper and middle sites whereas fishes reduced the abundances of both periphyton and invertebrates on stone surfaces at the lower site, where both benthic invertebrate feeders and grazers inhabited. A subsequent enclosure experiment showed that the reduction of invertebrate densities at the lower site was caused by the grazers rather than benthic invertebrate feeders. These experimental results suggested that effects of fishes on benthic assemblages are intensified downstream, owing to the occurrence of the grazing fish. Furthermore, observational data based on field sampling suggested that such grazing effects were reflected in longitudinal patterns in periphyton and invertebrate abundances. Overall results emphasize an important role of the grazing fish (S. japonicus) in shaping longitudinal patterns in benthic assemblage structure.
  • S Sone, M Inoue, Y Yanagisawa
    ICHTHYOLOGICAL RESEARCH 53 1 19 - 23 2006年02月 [査読有り]
     研究論文(学術雑誌) 
    Competition between two congeneric gobies, Rhinogobius sp. LD (large-dark type) and CB (cross-band type), for habitat was studied in a tributary of the Shimanto River, southwestern Shikoku, Japan. Habitat use by CB, measured by water depth, current velocity, and substrate, was compared between before and after the removal of LD. After the removal of LD, CB shifted their habitat use to coarser substrates than previously, suggesting a release from effects of LD. This result supports a hypothesis from our previous study that habitat partitioning between CB and LD is a consequence of interference effects of LD on CB.
  • 土肥唱吾, 峰松勇二, 井上幹生, 三宅洋
    土木学会環境システム委員会環境システム研究論文集 34 47 - 56 2006年 [査読有り]
  • M Inoue, M Nunokawa
    LIMNOLOGY 6 1 7 - 14 2005年04月 [査読有り]
     研究論文(学術雑誌) 
    The densities of two benthic fishes, the Siberian stone loach (Noemacheilits barbatulus) and the wrinklehead sculpin (Cottus nozawae), and the biomass of their food resources (i.e., periphyton and benthic invertebrates) were compared between forest and grassland streams in northern Hokkaido, Japan, to examine whether riparian deforestation had positive effects on the benthic fishes via enhancement of food availability. The comparisons indicated that riparian vegetation had little influence on periphyton, invertebrates, or fishes. Regression analysis indicated that spatial variations in loach and sculpin densities were explained more by substrate heterogeneity, competitor abundance, or both, rather than by food abundance. However, when the two species were combined as benthic insectivores, a strong correlation was found between total benthic fish density and invertebrate biomass. Our results suggest that, although total benthic fish abundance was food limited, riparian vegetation had no positive effects via food availability on the benthic fishes in our streams.
  • M Inoue, M Miyayoshi, S Sone
    ECOLOGICAL RESEARCH 20 2 151 - 161 2005年03月 [査読有り]
     研究論文(学術雑誌) 
    Habitat use and foraging behavior of two benthic insectivorous gobies, Rhinogobius sp. CO (cobalt type) and Rhinogobius sp. DA (dark type), were examined in relation to their predation effects on local prey density in a small coastal stream in southwestern Shikoku, Japan. Correlations among the foraging range, frequency of foraging attempts and current velocity indicated that individuals using fast-current habitats had small foraging ranges and infrequently made foraging attempts while those in slow currents frequently foraged over large areas. The former and the latter were recognized as ambush and wandering foragers, respectively. Interspecific comparisons of habitat use, foraging behavior and prey preference suggested that Rhinogobius sp. CO selectively forage mobile prey by ambushing in fast currents, whereas Rhinogobius sp. DA randomly forage available prey by wandering in slow-current habitats. A cage experiment was conducted to assess prey immigration rate and the degree of predation effects on local prey density in relation to current velocity. The results of the experiment support, at least in part, our initial predictions: (1) prey immigration rates increase with current velocity and (2) the effects of fish predation on local prey density are reduced as current velocity increases. Overall results illustrated a link between the foraging modes of the stream gobies and their predation effects on local prey density: fish adopt ambush foraging
  • T Iwata, M Inoue, S Nakano, H Miyasaka, A Doi, AP Covich
    JOURNAL OF TROPICAL ECOLOGY 19 606 - 606 2003年09月 [査読有り]
  • T Iwata, S Nakano, M Inoue
    ECOLOGICAL APPLICATIONS 13 2 461 - 473 2003年04月 [査読有り]
     研究論文(学術雑誌) 
    Tropical stream communities are increasingly threatened by A vast array of human perturbations. However, ecological impacts of deforestation on stream communities are poorly understood in tropical rain forests of Southeast Asia. We investigated the impacts of past riparian deforestation associated with slash-and-burn agriculture on stream habitats and communities in Borneo, East Malaysia, by comparing streams running through primary forests and those through secondary forests that had been deforested 9-20 yr previously. Distinctive differences were found in depositional character of stream habitats; secondary-forest reaches had finer substrates, more eroded banks, and larger areas of depositional habitat and cover than did primary-forest reaches. Although our findings suggest that such, altered habitats are recovering toward a predisturbance state with redevelopment of the secondary forests, effects of the habitat alteration on stream communities were still evident. The habitat alteration (i.e., sedimentation) lowered the abundance and/or diversity of every benthic assemblage (periphyton,, aquatic insects, shrimps, crabs, and benthic fishes), while nektonic fishes were less affected. Although the habitat alteration benefited a few benthic taxa, such a's caenid mayflies and two shrimps (Macrobrachium trompii and Caridina nilotica peninsularis), the overall effects were apparently detrimental, leading to a reduction in biodiversity of the stream communities. We concluded that slash-and-burn agriculture, which alters vegetation and soil conditions more intensively than logging, caused long-term degradation of stream communities (at least nine years in our study). These findings emphasize the importance of management practices that protect the stream biodiversity from poorly regulated land use in Southeast Asia.
  • Fish assemblage composition, abundance-habitat relationships and habitat use in tropical rain forest streams, Sarawak, Borneo: effects of past deforestation
    Inoue M, Iwata T, Nakano S, Doi A, Miyasaka H
    Biosphere Conservation 5 71 - 86 2003年 [査読有り]
  • M Inoue, M Nunokawa
    FRESHWATER BIOLOGY 47 9 1594 - 1607 2002年09月 [査読有り]
     研究論文(学術雑誌) 
    1. Stream reaches contain assortments of various habitat types that can be defined at different spatial scales, such as channel unit (e.g. pools, riffles) and subunit (patches within channel units). We described longitudinal (upstream-downstream) patterns of stream habitat structure by considering subunits as structural elements, and examined their effects on the abundance of masu salmon (Oncorhynchus masou ) and rosyface dace (Leuciscus ezoe ) in a third-order tributary of the Teshio River in northern Hokkaido, Japan. 2. Nine subunit types were determined on the basis of water depth, current velocity and substrate, using 0.5 x 0.5 m grids. Although both masu salmon and rosyface dace used pools as a major habitat, the former preferred a subunit type occurring at pool heads (PH subunit) while the latter preferred a slow-current edge type (SE-2 subunit). 3. Along the course of the stream, slow-edge subunits (SE-1, 2 and 3) increased in frequency downstream while fast-edge subunits (FE-1 and 2) decreased, suggesting a downstream development of slow-current edges. Regression analyses indicated that longitudinal variation in masu salmon abundance was explained by the area of PH, rather than pools. Masu salmon density increased with the area of PH. Rosyface dace abundance was explained by a combination of water depth and the area of SE-2, both effects being positive. 4. Longitudinal variations in the abundance of both species were related to the abundance of their preferred habitat at the subunit scale, rather than channel-unit scale. The results emphasise the importance of fine-scale patchiness when examining stream fish habitats.
  • JN Negishi, M Inoue, M Nunokawa
    FRESHWATER BIOLOGY 47 8 1515 - 1529 2002年08月 [査読有り]
     研究論文(学術雑誌) 
    1. The effects of channelisation on macroinvertebrates were examined in relation to a spate and flow refugia. Habitat components that can function as flow refugia were identified in a small, low-gradient stream in northern Hokkaido, Japan. 2. Macroinvertebrates and their habitat characteristics (depth, current velocity and substratum) were sampled and measured in natural and channelised sections on three occasions: before, during and immediately after a spate. For macroinvertebrate sampling and habitat measurements, five (riffle, glide, pool, backwater and inundated habitats) and three (channelised-mid, channelised-edge and inundated habitats) habitat types were classified in the natural and channelised section, respectively. 3. The rate of velocity increase with discharge was compared among habitat types to determine which habitat types were less affected by increased discharge. The rate was the highest in riffles followed by glides and channelised-mids. Backwaters maintained low current velocity even at high flow. In addition, current velocity in both natural and channelised inundated habitats was low relative to other habitat types during the spate. 4. Through the spate, total density of macroinvertebrates in channelised-mids and taxon richness in both channelised-mids and edges decreased. In the natural section, however, such a significant decrease was not found except for taxon richness in pools. This indicated that the spate had a greater impact on assemblages in the channelised section. Riffle assemblages exhibited a rapid recovery immediately after the spate, suggesting the existence of flow refugia in the natural section. Among the habitat types we examined, backwaters and inundated habitats appeared to have acted as flow refugia, because these habitats accumulated macroinvertebrates during the spate. 5. The lower persistence of the macroinvertebrate assemblage in the channelised section was attributable to the lower availability of flow refugia such as backwaters and inundated habitats. Our results emphasised the importance of considering flow fluctuations and refugia in assessing the effects of channelisation. In addition, the lateral heterogeneity of stream channels should be considered in stream restoration and management.
  • A Doi, T Iwata, M Inoue, H Miyasaka, MS Sabki, S Nakano
    RAFFLES BULLETIN OF ZOOLOGY 49 1 13 - 17 2001年07月 [査読有り]
     研究論文(学術雑誌) 
    We surveyed fish fauna in 21 locations over the Rayu River system running through the Kubah National Park, Sarawak. In this study, we recognized 27 species in 18 genera belonging to 13 families. Ambassis miops Gunther, 1872 and Stenogobius ingeri Watson, 1991 were newly recorded. Pseudomystus rugosus (Regan, 1913) was rediscovered from Sarawak.
  • M Inoue, S Nakano
    ECOLOGICAL RESEARCH 16 2 233 - 247 2001年06月 [査読有り]
     研究論文(学術雑誌) 
    The relationships between habitat variables and population densities of masu salmon (Oncorhynchus masou), rosyface dace (Leuciscus ezoe), Siberian stone leach (Noemacheilus barbatulus) and wrinklehead sculpin (Cottus nozawae) were examined by data collected at 55 reaches in forest and grassland streams in northern Hokkaido, Japan. Regression analysis suggested that salmon and dace densities were affected by water temperature (negative for salmon, positive for dace) and structural habitat factors (woody debris for salmon, pools for dace). Salmon density was higher in forest reaches than in grassland reaches, whereas dace density was higher in grassland reaches, suggesting that the removal of riparian forest had raised water temperature and allowed upstream invasions by dace. In contrast to salmon and dace, neither the density of leach nor sculpin differed between the forest and grassland reaches. For their densities, a negative effect of each on the other was most important, suggesting a strong effect of interspecific competition between leach and sculpin on their distributions. However, regression models also suggested that substrate heterogeneity mediated the outcome of their interspecific competition. On the basis of the results, a scenario is predicted for a fish-assemblage change with a typical land-development process in Hokkaido, and the importance of leaving or restoring riparian buffer for conservation and restoration of stream habitat is emphasized.
  • S Sone, M Inoue, Y Yanagisawa
    ECOLOGICAL RESEARCH 16 2 205 - 219 2001年06月 [査読有り]
     研究論文(学術雑誌) 
    The importance of interspecific competition to habitat use by two congeneric stream gobies, Rhinogobius sp. LD (large-dark type) and CB (cross-band type), was studied by: (i) examining differences in habitat use by each species along the course of the stream; and (ii) comparing microhabitat use and the diet of each species between in allopatry and in sympatry in tributaries of the Shimanto River, south-western Shikoku, Japan. Rhinogobius sp. LD mainly used riffles through the course of the stream. Although CB also mainly used riffles in the lower reaches where CB was numerically dominant, the greater use of riffles by CB was not observed in upper reaches where LD was dominant. Microhabitat analysis revealed that both LD and CB preferred lower bottom velocity in faster current in both allopatry and sympatry. Tn sympatry, however, LD used coarser substrate and faster current than CB, and both LD and CB used narrower ranges of microhabitat conditions than in allopatry. Dietary analysis indicated that both allopatric and sympatric LD preferred baetids, which are apt to drift, suggesting they adopted ambush foraging. Allopatric CB preferred leptophlebiids and chironomids, which are also apt to drift, whereas sympatric CB did not prefer such invertebrates. Overall results of this study suggest that LD and CB compete for better feeding habitats, CB shift their habitat use and foraging mode under the influence of LD, and current velocity and substrate coarseness are key factors in their habitat segregation.
  • Yoshinori Taniguchi, Mikio Inoue, Yoichi Kawaguchi
    Aquatic Ecosystem Health and Management 4 4 357 - 365 2001年 [査読有り][招待有り]
     研究論文(学術雑誌) 
    Japanese freshwater fish habitats can be generally categorized into 1) rivers and streams, 2) ponds and lakes, and 3) rice fields and small irrigation channels connecting them. Of these, reviewing studies on stream fish habitat is the primary objective of this paper. Streams in Japan have widely received severe habitat alterations through construction of artificial instream structures as well as modification of riparian vegetations. As a result, streamdwelling fishes that require natural flow regimes, substrates, and riparian vegetation have declined their populations in great deal in many parts of the country. Recent studies have found riparian forests control water temperature and provide woody debris creating cover structures for the stream fishes resulting in enhancing their carrying capacity. Differences in riparian vegetation types (forest versus grass) played an important role in determining the local distribution of salmonids. Also, experiments removing concrete-lined channel and installing log-drop structures demonstrated that such the treatment greatly improved fish habitat. As the general public became aware of the serious degradation of aquatic habitats, river management policy has gradually shifted to include conservation and improvement of river environment as habitat for wildlife during the last two decades. For fish migration, installation of fishway on dams has been prevailing, and research efforts have been made to design more effective fishway and passable weirs. In many cases, however, such restoration work lacks ecological data for assessment of their effectiveness. When such knowledge on fish habitat are accumulated, a vital issue will be how it is accounted into actual management. Future studies on fish habitat should shift toward treating habitat network at larger spatial scales to seek better designs for distributing appropriate habitats over a whole catchment. Such studies should also include clarifying the habitat requirements of endangered species and effects of non-native on native species. © 2001, Taylor & Francis Group, LLC. All rights reserved.
  • M Inoue, S Nakano
    FRESHWATER BIOLOGY 42 4 597 - 608 1999年12月 [査読有り]
     研究論文(学術雑誌) 
    1. Habitat structure and habitat use by juvenile masu salmon, Oncorhynchus masou Brevoort, in small streams in northern Hokkaido, Japan, were examined by considering 'subunits' (patches within channel units) as structural elements of stream reaches. 2. Whole wetted channel surfaces of three study reaches were divided into 0.5 x 0.5 m quadrats, which were grouped into eight subunit types according to water depth and velocity, and substratum conditions by a cluster analysis. The subunit distribution showed a regular mosaic pattern corresponding to the channel-unit sequence in each of the three reaches. 3. Juvenile masu salmon exhibited a strong preference for a subunit type characterized by greater depth and moderate current velocity (deep-moderate subunit; mean depth = 0.29 m; mean velocity = 0.19 m s(--1)). This subunit type usually occurred downstream of stretches with fast current. The preference of masu salmon for the deep-moderate subunit could be because of its usual spatial position in relation to other subunit types as well as to the characteristics of the subunit itself. 4. The results suggest that the value of a habitat is determined not only by the characteristics of the habitat itself, but also by those of adjacent habitats. Therefore, habitat use by stream fish should be studied in the context of the whole 'in-stream landscapes'.
  • 布川 雅典, 井上 幹生
    陸水學雜誌 60 3 385 - 397 日本陸水学会 1999年09月 [査読有り]
  • 岸千春, 中村太士, 井上幹生
    日本生態学会誌 49 11 - 20 1999年 [査読有り]
  • M Inoue, S Nakano
    FRESHWATER BIOLOGY 40 1 1 - 16 1998年08月 [査読有り]
     研究論文(学術雑誌) 
    1. The effects of woody debris on stream habitat of juvenile masu salmon (Oncorhynchus masou) were examined at two spatial scales, stream reach and channel unit, for first- to third-order tributaries of the Teshio River in northern Hokkaido, Japan. The forty-eight study reaches were classified into three distinct types: coarse-substrate step-pool (CSP), coarse-substrate pool-riffle (CPR) and fine-substrate pool-riffle (FPR) reaches. Each reach type included reaches with different riparian settings, broadly classified as forest (relatively undisturbed forest and secondary forest after fires) or grassland (bamboo bushland and pasture). 2. The reach-scale analyses showed that neither total pool volume nor pool-to-pool spacing was correlated with woody debris abundance in any of the three reach types. Masu salmon density was positively correlated with both woody-debris cover area and total cover area, but not with total pool volume in the reaches. 3. Channel-unit-scale analyses revealed that woody debris reduced non-pool velocity, increased pool depth and retained fine sediment in pools in FPR reaches, where the size of woody debris was very large relative to the substrate material size. However, woody debris did not influence any of the hydraulic variables (depth, velocity, substrate) in either non-pools or pools of CSP and CPR reaches. Habitat use by masu salmon in non-pools or pools was affected by woody-debris cover area or total cover area rather than by hydraulic variables in any of the reach types. 4. The effects of woody debris on habitat at the reach- and channel-unit scales in the study area were less than those indicated by previous work in the Pacific Northwest, North America, owing to the relatively small size of the riparian trees. However, the overall results suggested that woody debris in the study area contributed to masu salmon habitat by providing cover at the smaller, microhabitat scale.
  • M Inoue, S Nakano, F Nakamura
    CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES 54 6 1331 - 1341 1997年06月 [査読有り]
     研究論文(学術雑誌) 
    Relationships between abundance of juvenile masu salmon (Oncorhynchus masou) and stream habitat were analyzed on two spatial scales, stream reach and channel unit, in northern Hokkaido, Japan. Reach-scale analyses revealed that high water temperatures limited the salmon population level and that the salmon abundance increased with cover availability. These two limiting factors were strongly associated with the presence of riparian forest, emphasizing its importance for the salmon population. Channel-unit scale analyses showed greater use of pools by the salmon, with greater depth and abundant cover underlying the patterns of habitat use. However, the relative importance of depth and cover varied among the reach types having different cover availability. In reaches that had abundant cover, cover itself was less important in determining patterns of habitat use within the reaches. In contrast, in reaches with poor cover, patterns of habitat use were strongly affected by cover. The results indicated that habitat characteristics at the reach scale affect not only the salmon abundance of the stream reaches, but also the determinants of local abundance patterns of the salmon within the reaches. It was suggested that larger-scale influences in a hierarchy of habitat scales should be considered for better understanding of fish-habitat relationships.
  • 豊島照雄, 中野繁, 井上幹生, 小野有五, 倉茂好匡
    日本生態学会誌 46 9 - 20 1996年 [査読有り]
  • 井上幹生, 中野繁
    日本生態学会誌 44 151 - 160 1994年 [査読有り]
  • S KITANO, S NAKANO, M INOUE, K SHIMODA, S YAMAMOTO
    NIPPON SUISAN GAKKAISHI 59 11 1837 - 1843 1993年11月 [査読有り]
     研究論文(学術雑誌) 
    Diet, foraging behavior, growth, sexual maturity, and spawning site selection were studied in a wild population of exotic rainbow trout Oncorhynchus mykiss in the spring-fed Horonai stream in Hokkaido, Japan. During spring and summer, the rainbow trout ale primarily aquatic and terrestrial invertebrates, but eggs and larvae of river sculpin Coitus nozawae constituted 10% of the diet by number in spring. Rainbow trout typically held focal points in the stream Bow and intercepted food items in the drift. Sexually mature individuals caught in late January were ages 1-5(+). Males ranged 11.0-36.5 cm and females 16.8-33.1cm in fork length. Females constructed spawning redds in calm riffles with fine gravel substrate. Our results suggest that introductions of rainbow trout may have detrimental effects on Japanese stream fishes and other aquatic biota through interspecific competition for food and space and/or predation.
  • 北野 聡, 中野 繁, 井上 幹生, 下田 和孝, 山本 祥一郎
    日本水産学会誌 59 11 1837 - 1843 1993年 [査読有り]
     研究論文(学術雑誌) 
    Diet, foraging behavior, growth, sexual maturity, and spawning site selection were studied in a wild population of exotic rainbow trout Oncorhynchus mykiss in the spring-fed Horonai stream in Hokkaido, Japan. During spring and summer, the rainbow trout ate primarily aquatic and terrestrial invertebrates, but eggs and larvae of river sculpin Cottus nozawae con-stituted 10% of the diet by number in spring. Rainbow trout typically held focal points in the stream flow and intercepted food items in the drift. Sexually mature individuals caught in late January were ages l-5+. Males ranged 11.0-36.5 cm and females 16.8-33.1 cm in fork length. Females constructed spawning redds in calm riffles with fine gravel substrate. Our results suggest that introductions of rainbow trout may have detrimental effects on Japanese stream fishes and other aquatic biota through interspecific competition for food and space and/or predation. © 1993, The Japanese Society of Fisheries Science. All rights reserved.

書籍

  • 河川生態系の調査・分析方法
    井上幹生, 中村太士 (担当:共編者(共編著者), 範囲:編集および執筆(河川地形と水や土砂の流れ,河川生息場を表す))
    講談社 2019年09月
  • 河川生態学
    中村太士 (担当:分担執筆, 範囲:魚類)
    講談社 2013年
  • 環境科学と生態学のためのR統計
    大森浩二, 井上幹生, 畑啓生 (担当:その他)
    共立出版 2011年
  • 森林の科学
    中村太士, 小池孝良 (担当:分担執筆, 範囲:森は魚を育む?)
    朝倉書店 2005年
  • 改訂 砂防用語集
    (担当:分担執筆)
    山海堂 2004年
  • Fishes and forestry: worldwide watershed interactions and management
    Northcote TG, Hartman GF Eds (担当:分担執筆, 範囲:Freshwater fishes and forests in Japan)
    Blackwell 2004年
  • 川と森の生態学 中野繁論文集
    中野繁 (担当:その他)
    北海道大学図書刊行会 2002年
  • 森の自然史
    菊沢喜八郎, 甲山隆司 (担当:分担執筆, 範囲:河川の構造と森林)
    北海道大学図書刊行会 2000年
  • 魚から見た水環境
    森誠一 編 (担当:分担執筆, 範囲:森と魚)
    信山社サイテック 1998年

講演・口頭発表等

  • 大久保征, 篠原拓馬, 井上幹生
    本魚類学会2019年度年会 2019年09月 ポスター発表
  • 三町壮大, 山本貫太, 植村洋亮, 井上幹生, 畑啓生
    日本魚類学会2019年度年会 2019年09月 ポスター発表
  • 冬季において水温がオイカワの肥満度に及ぼす影響  [通常講演]
    東垣大祐, 佐々木進一, 井上幹生
    日本魚類学会2019年度年会 2019年09月 ポスター発表
  • Responses of stream invertebrate and fish assemblages to an extreme flood event in a Japanese river  [通常講演]
    Sumida K, Miyake Y, Watanabe Y, Inoue M
    Society for Freshwater Science 2019 Annual Meeting 2019年05月 口頭発表(一般)
  • 山本貫太, 三町壮大, 植村洋亮, 井上幹生, 畑啓生
    第66回日本生態学会大会 2019年03月 ポスター発表
  • 網状流路における魚類の流路選択  [通常講演]
    東垣大祐, 井上幹生
    第66回日本生態学会大会 2019年03月 ポスター発表
  • 重信川で発生した記録的出水による底生動物・魚類群集の変動  [通常講演]
    角田康佑, 三宅 洋, 渡辺 裕也, 井上 幹生
    応用生態工学会第22回研究発表会 2018年09月 ポスター発表
  • 重信川砂礫堆における地表性無脊椎動物群集  [通常講演]
    竹門玄地, 川西亮太, 井上幹生
    日本生態学会中国四国地区大会 2018年05月 ポスター発表
  • 仁淀川水系黒川源流域における移入イワナの侵入状況  [通常講演]
    永吉雅希, 市守大介, 奥谷孝弘, 末國仙理, 竹林佑記, 井上幹生
    日本魚類学会2017年度年会 2017年09月 ポスター発表
  • 仁淀川水系黒川源流域におけるアマゴとイワナの移動と成長  [通常講演]
    篠原拓馬, 奥谷孝弘, 市守大介, 井上幹生
    日本魚類学会2017年度年会 2017年09月 口頭発表(一般)
  • 日本の河川に生息する魚類の分布と攪乱レジームとの関係性  [通常講演]
    川西亮太, 吉村研人, 渡辺裕也, 三宅洋, 井上幹生, 赤坂卓美
    日本生態学会第64回全国大会 2017年03月 ポスター発表
  • Forests, stream ecosystems and fishes  [通常講演]
    Inoue M
    Workshop on “Ecology and Conservation of freshwater biodiversity in riverine ecosystems” 2017年03月 口頭発表(一般)
  • 日本の河川における国外外来魚の分布と攪乱レジームとの関係性  [通常講演]
    川西亮太, 吉村研人, 渡辺裕也, 三宅洋, 井上幹生, 赤坂卓美
    2016年09月 ポスター発表
  • 仁淀川水系黒川源流域における移入イワナと在来アマゴの幼魚期における成長  [通常講演]
    市守大介, 井上幹生
    2016年09月 口頭発表(一般)
  • 愛媛県重信川中流域の自然再生水域における温度勾配に対応した魚類の季節的移動  [通常講演]
    佐々木進一, 井上幹生
    日本魚類学会2016年度年会 2016年09月 口頭発表(一般)
  • 重信川水系における攪乱レジームと河川動物群集の関係  [通常講演]
    泉哲平, 吉村研人, 井上幹生, 三宅洋
    応用生態工学会 第20回大 2016年09月
  • 渓流生態系への餌資源供給と土砂流出に対する森林植生の影響範囲  [通常講演]
    井上幹生, 菊地修吾, 竹林佑記
    日本生態学会中四国地区会 第60回大会 2016年05月 口頭発表(一般)
  • 仁淀川水系黒川源流域における在来アマゴに対する移入イワナの影響−食性解析からの推測−  [通常講演]
    阿部博文, 市守大介, 井上幹生
    2015年09月 口頭発表(一般)
  • 仁淀川水系黒川源流域における移入イワナの分布域拡大および在来アマゴに対するその影響  [通常講演]
    市守大介, 阿部博文, 井上幹生, 水野信彦
    日本魚類学会2015年度年会 2015年09月 口頭発表(一般)
  • アマゴ個体群の時空間的動態から見た分断化の影響  [通常講演]
    奥谷孝弘, 後藤将太, 福家柔, 末國仙理, 井上幹生
    日本魚類学会2015年度年会 2015年09月 ポスター発表
  • 仁淀川水系における移入イワナの分布  [通常講演]
    市守大介, 阿部博文, 井上幹生, 水野信彦
    日本生態学会中国四国地区大会 2015年05月 口頭発表(一般)
  • 源流小水系全域におけるアマゴの空間的動態 −局所プロセスの効果−  [通常講演]
    奥谷孝弘, 福家柔, 末國仙理, 井上幹生
    日本魚類学会2014年度年会 2014年11月 ポスター発表
  • 愛媛県東部におけるナガレホトケドジョウの分布と環境要因との対応  [通常講演]
    青木新吾, 井上幹生
    日本魚類学会2014年度年会 2014年11月 ポスター発表
  • 様々な魚類の分布解析で検出されるダムの影響  [通常講演]
    井上幹生, 川西亮太, 菊地修吾, 角崎嘉史, 田頭亮臣
    応用生態工学会第18会研究発表会 2014年09月 口頭発表(一般)
  • Channel incision mediates the effect of flood disturbance on fish and invertebrates.  [通常講演]
    Miyake Y, Imada S, Inoue M
    Joint Aquatic Science Meeting 2014 2014年05月 ポスター発表

MISC

  • 井上 幹生, 菊地 修吾, 川西 亮太 水源地環境技術研究所所報 = Report of Water Resources Environment Research Institute 79 -83 2016年
  • 河川生態系における人為的インパクト
    井上幹生 愛媛ジャーナル H26年 (6月) 76 -79 2014年 [招待有り]
  • ザリガニにまつわる思い出:西川潮氏の受賞に寄せて
    井上幹生 日本生態学会誌 60 319 -320 2010年 [招待有り]
  • 瀬切れの進行が河川生物群集に及ぼす影響
    土木学会環境システム委員会環境システム研究論文集 37 29 -38 2009年
  • 河川性魚類の生息環境における倒流木の役割
    井上幹生 社団法人日本河川協会河川 64 (4) 76 -78 2008年 [招待有り]
  • 重信川の瀬切れが河川性動物の分布に及ぼす影響
    土肥唱吾, 三谷哲史, 峰松勇二, 木村沙織, 井上幹生, 三宅 洋 愛媛大学工学部工学ジャーナル 7 133 -145 2008年
  • 河道の直線化改修がサクラマス幼魚の微生息場所に与える影響
    中野繁, 井上幹生 魚と卵 164 23 -32 1995年
  • 北海道大学天塩中川地方演習林および隣接地域における淡水魚類相と沿山・砂防ダムが分布に及ぼす影響
    中野繁, 井上幹生, 桑原禎知, 豊島照雄, 北條元, 藤戸永志, 杉山弘, 奥山悟, 笹賀一郎 北海道大学農学部演習林研究報告 52 (2) 95 -109 1995年
  • 知床半島の河川から得られたハナカジカおよびミミズハゼ
    中野繁, 下田和孝, 北野聡, 井上幹生 知床博物館研究報告 14 33 -35 1993年
  • 知床半島における河川魚類群集の現状-特に人間活動の影響を中心に
    下田和孝, 中野繁, 北野聡, 井上幹生 北海道大学大学院環境科学茂究科邦文紀要 6 17 -27 1993年

受賞

  • 2018年10月 日本魚類学会 2018年度 日本魚類学会論文賞
     
    受賞者: 井上 幹生
  • 2008年 河川整備基金助成事業優秀成果
     JPN
  • 2006年 日本生態学会論文賞
     JPN

共同研究・競争的資金等の研究課題

  • 環境収容力推定手法開発事業・ウナギ課題
    水産庁委託事業:
    研究期間 : 2018年 -2023年
  • 水及び生物体内のトレーサービリティを活用した生物生産環境解析手法の開発
    JSPS:科学研究費補助金(挑戦的・萌芽)
    研究期間 : 2018年 -2021年 
    代表者 : 山田佳裕
  • 在来種の排除を伴わない移入種定着の影響:資源分割を介した生産構造の改変
    JSPS:科学研究費補助金(基盤C)
    研究期間 : 2017年 -2019年 
    代表者 : 井上幹生
  • 水系ネットワークにおける渓流魚の空間的動態と森林のパッチモザイク構造との関係
    JSPS:科学研究費補助金(基盤C)
    研究期間 : 2014年 -2016年 
    代表者 : 井上幹生
  • 人工林が渓流魚に及ぼす影響:バイオエナジェティックモデルによる定量的評価
    JSPS:科学研究費補助金(基盤C)
    研究期間 : 2010年 -2012年 
    代表者 : 井上幹生
  • 回遊魚に配慮した河川管理技術の開発:生息決定要因と個体群動態の解明
    JSPS:科学研究費補助金(基盤C)
    研究期間 : 2007年 -2009年 
    代表者 : 高木基裕
  • 河川生態系における人工林の生態学的機能
    JSPS:科学研究費補助金(基盤C)
    研究期間 : 2007年 -2009年 
    代表者 : 井上幹生
  • 希少種ヒナイシドジョウの生息環境保全のための基礎的研究
    河川環境管理財団 研究助成:
    研究期間 : 2007年 
    代表者 : 井上幹生
  • 移入魚ニジマスの定着機構および在来魚類群集に及ぼす影響
    JSPS:科学研究費補助金(若手B)
    研究期間 : 2003年 -2004年 
    代表者 : 井上幹生
  • 外来魚の分散に関する実態調査:用水路を介した分布域拡大の可能性
    河川環境管理財団(美化・緑化)研究助成:
    研究期間 : 2002年 
    代表者 : 井上幹生
  • 河川本流に対する灌漑用湧水池および用水路の魚類の生息環境としての役割
    河川環境管理財団(美化・緑化)研究助成:
    研究期間 : 1998年 
    代表者 : 井上幹生

愛媛大学教員活動実績

教育活動(B)

担当授業科目(B01)

  • 2019, 前期, 学部, 生態学
  • 2019, 前期, 学部, 生物学野外実習
  • 2019, 前期, 学部, 生物学ゼミナールⅠ
  • 2019, 前期, 学部, 生物学特別演習Ⅰ
  • 2019, 前期, 学部, 卒業研究Ⅰ
  • 2019, 前期, 修士, 生物学ゼミナールI
  • 2019, 前期, 修士, 生物学ゼミナールⅢ
  • 2019, 前期, 修士, 生物学課題実験I
  • 2019, 前期, 修士, 生物学課題実験Ⅲ
  • 2019, 前期, 学部, 生態学
  • 2019, 前期, 学部, 生物学野外実習


Copyright © MEDIA FUSION Co.,Ltd. All rights reserved.