Researchers Database

OMORI, Koji

    Faculty of Collaborative Regional Innovation Department of Environmental Design Professor
Last Updated :2021/03/05

Researcher Information

Degree

  • (BLANK)(Kyushu University)

J-Global ID

Research Interests

  • 生態系生態学   海洋生態学   Ecosystem Ecology   Marine Ecology   

Research Areas

  • Life sciences / Ecology and environmental science

Association Memberships

  • ベントス学会   アメリカ生態学会(The Ecological Society of America)   個体群生態学会   日本生態学会   

Books etc

  • 同所的種分化モデル : 河川を舞台に
    水生動物の卵サイズ 2001
  • The model of sympatric speciation in fuluvial environments.
    Egg Size of Aquatic Creature 2001

Works

  • 南西諸島マングローブ林の底生動物相
    1994
  • マレーシア国マタンマングローブ林におけるベントス群集
    1994
  • Benthos community of the mangrove forests in the Iriomote Island in the south Japan.
    1994
  • Community Dynamics of benthic animals in Matang Mangrove Forest Reserve of Malaysia
    1994
  • マレーシア国マタンマングローブ林におけるベントス群集
    1992 -1993
  • Community dynamics of benthic animals in Matang Mangrove Forest Reserve of Malaysia
    1992 -1993
  • タイ国マングローブ生態系における生物過程の研究.
    1989 -1990
  • The comparative study of benthic community structures among several mangrove swamps in thailand.
    1989 -1990

MISC

  • 沿岸域の保全-生態系解析からのアプローチ-
    地球環境  2001
  • Conservation of Coastal Ecosystem-An Ecosystem Analysis Approach
    2001
  • K Kato, K Omori, M Yoneda  HYDROBIOLOGIA  437-  (1-3)  221  -233  2000/10  
    The feeding ecology of the Pacific Golden Plover (Pluvialis fulva) in the Sg. Labu river near the Matang Mangrove Forest Reserve on the west coast of the Malay Peninsula was studied in March and April of 1994. The plovers had two foraging sites, a polychaete-feeding and a mussel-feeding site, which were located at a distance of about 1 km from each other. The tidal height of the polychaete-feeding site was higher than that of the mussel-feeding site, which was not exposed at the neap tide. Therefore, the polychaete-feeding site, which was exposed during every low tide, was better for food collection than the mussel-feeding site. The individuals that undertook more frequent changes in feeding sites had a lower intake rate of polychaetes in the polychaete-feeding site. There were two classes in the feeding order, and the lower class had to feed on mussels in addition to polychaetes to obtain sufficient food. For polychaete-eaters, the total number of steps during a feeding bout was significantly higher and the number of pecks was significantly lower than those of mussel-eaters. Usually, mussel-eaters spent more time preening and resting than polychaete-eaters, although the former had less time for feeding than the latter had because of the shorter exposure time of the mussel-feeding site. This means that mussel-eaters may have had higher feeding efficiency than polychaete-eaters, regardless of their preference for polychaetes as a diet. Polychaete larvae frequently settled on mussel beds and their populations became established after the collapse of mussel populations. Therefore, mussels were not only an important part of the diet of P. fulva, but they also constructed mussel beds that attract polychaetes, i.e. the plover's most important food.
  • マレー半島西岸におけるムナグロの摂食生態
    437-  221  -233  2000
  • 養殖漁業の適正化
    瀬戸内海  19-  40  -44  1999
  • Regulation of the fish stock of aquaculture
    Seto Inland Sea.  19-  40  -44  1999
  • Sustainable usage of coastal ecosystems.
    Proceedings of the joint conferece of MEDCOAST and EMECS 99.  1999
  • K Omori, B Irawan, Y Kikutani  HYDROBIOLOGIA  386-  (386)  27  -36  1998  
    In the Shigenobu River Estuary (33 degrees 48' 18 " N, 132 degrees 41' 10 " E), Matsuyama (Japan), Helice tridens inhabits the mid-intertidal zone to the limit of the high tide, while H. japonica is found around the mid-intertidal zone. In addition, H. japonica is distributed further downstream than H. tridens. These differences suggest that H. japonica has a lower salinity and desiccation tolerance than H. tridens. Laboratory experiments on salinity tolerance confirmed the higher tolerance of H. tridens compared to H. japonica. Helice tridens survived at least a week under fresh water conditions, whereas most of the H. japonica died. Helice tridens was shown to be more able to tolerate desiccation than H. japonica, through behavioral, not physiological, adaptation to dry conditions. The present results demonstrate a stronger adaptation of H. tridens to semi-terrestrial and/or freshwater environments than H. japonica.
  • Environmental Biology of Fishes  52-  (1/3)  321  -329  1998
  • K Omori, K Shiraishi, M Hara  JOURNAL OF CRUSTACEAN BIOLOGY  17-  (2)  279  -288  1997/05  
    Life-history traits of two mud-flat crabs, Helice japonica and H. tridens, were examined on the basis of monthly sampling at 13 stations from April 1986 to March 1987 in the Shigenobu River estuary, Shikoku Island, southwest Japan. Helice japonica and H. tridens co-occur at high densities in estuaries and salt marshes throughout western Japan, but their main habitats do not overlap in the Shigenobu River estuary. Helice japonica was found in the midintertidal, while H. tridens occurred from the midintertidal up to the high intertidal. The density of H. japonica was higher than H. tridens, though the habitat of H. japonica was limited to the lower part of the estuary. The size-frequency distributions of both species were complicated and the generation structures of them could not be elucidated, with the result that growth curves and survivorship curves of both species could not be established. Helice japonica matures more quickly, is smaller at first reproduction, has a shorter reproductive period, smaller number of broods, slightly smaller eggs, and a larger brood size. Moreover, only H. tridens shows a semilunar or lunar reproductive cycle, which may increase the reproductive rate at low population density. The two closely related species inhabited an estuary and had different life histories. In the present study, an example of the possibility of the diverse patterns of life-history traits under the constraint of a single set of environmental factors is provided.
  • ベントス-その沿岸域生態系における位置づけ.
    沿岸海洋研究  35-  (1)  115  -122  1997
  • Benthos-its role in a coastal ecosystem
    35-  (1)  115  -122  1997
  • 底質の酸素消費量に基づく適正養殖基準の決定法
    水産海洋研究  60-  (1)  45  -53  1996
  • Intraspecific brood-mixing in the cichlid, ┣DBPerissodus microlepis(/)-┫DB
    Env. Fish. Ecol.  43-  201  -206  1995
  • K OMORI, Y YANAGISAWA, N HORI  JOURNAL OF CRUSTACEAN BIOLOGY  14-  (1)  132  -145  1994/02  
    The life history of Periclimenes ornatus, an obligate symbiont of the sea anemone Parasicyonis maxima, was studied in southwest Japan. Ovigerous females occurred year-round, and the proportion of such females was high from May-November. Most of the settlement of juveniles took place from August-October. Females had higher growth rates and attained larger sizes at sexual maturity than males. The eggs of P. ornatus were of about average dimensions among caridean shrimps, but the brood size was relatively large. Most juveniles that settled in August and early September attained sexual maturity and reproduced within the year (the first generation), whereas juveniles that settled later did not reach maturity within the year. The immature shrimps that had overwintered reached maturity in the next reproductive season (the second generation). A fraction of the first generation survived into the next reproductive season and, together with the second generation, was the source of the following generations.
  • K OMORI, T HIRANO, H TAKEOKA  MARINE POLLUTION BULLETIN  28-  (2)  73  -80  1994/02  
    Artificial organic loading of a coastal ecosystem with materials such as urban sewage and aquacultural waste must be confined within the assimilative ability of the ecosystem, which is defined as the capacity for oxygenic degradation of organic matter at the bottom of the system. Suitably restricted loading should allow the sustainable use of a coastal ecosystem. Bed sediments at eight sites in Uwajima Bay, Japan, were sampled with a cylindrical core sampler and were incubated under constant temperature for the measurement of their rates of oxygen uptake. The rate of oxygen uptake was maximal for a particular concentration of sulphide in the substratum, which may have some proportional relationship to the extent of organic loading. The concentration of sulphide at the peak of oxygen uptake ranged from 0.02-0.06 mg S g-1 among sampling sites. A positive relationship between the density of several kinds of benthos and the rate of oxygen uptake by the substratum was also found by multivariate analysis. A model of a coastal ecosystem was constructed, and the effects of environmental factors, such as temperature, depth and vertical mixing rate, on the upper limit of organic loading were investigated. The estimated concentration of reduced substance, as an indicator of the upper limit of organic loading, did not vary, but the upper limit itself varied widely depending on environmental factors.
  • 海底境界層における生物過程と物質循環
    沿岸海洋研究ノート  28-  (1)  1990
  • 生活史特性の変異に関するシステムモデル解析
    個体群生態学会会報  46-  1990
  • Biological process and biogeochemical cycles in the benthic boundary layer.
    Bulletin on coastal Oceanography  28-  (1)  1990
  • System analysis on the variation of life history traits.
    Bulletin of the Society of Population Ecology.  46-  1990
  • Comparative Study on benthic Community structures in two mangrove swamps of Iriomote island, Okinawa
    Galaxea  8-  1989
  • 西表島マングローブ域のベントス群集(予報)
    日本ベントス学会誌  33134-  91  -94  1988
  • 物質循環とベントス群集
    東大海洋研究所大槌臨海研究センター  14-  1988
  • Benthos community of the mangrove forests in the Iriomote Island.
    Benthos Research  33134-  91  -94  1988
  • The role of benthic community in the nutrient cycle of a coastal marine ecosystem
    Otsuchi Mar. Res. Cent. Rep.  14-  1988
  • 群集動態論-個体及び個体群からのアプローチ
    海洋科学  19-  (2)  1987
  • Community Dynamics.
    Marine Sciences Monthly  19-  (2)  1987
  • 汽水産端脚類Corophium volutator(Pallas)の生活史-生殖の半月周期性または月周期性の適応的意義について
    日本ベントス研究会誌  28-  1985
  • Life history of a mudflat amphipod corophium volutator. -The adaptive significance of semi-lunar on lurar reproductive cycle.
    Benthos Research  28-  1985
  • Community Structure of a rocky shore in Tsujishima Island, Amakusa. I. Horizontal and vertical distribution pattern of common animals.
    Publ. Amakusa Mar Biol. Lad.  8-  (1)  1985
  • 空間的異質性に基づくヤマトオサガ=Macrophthalmus japonicusの生活史諸特性の相違.
    日本ベントス研究会誌  27-  1984
  • The variation of life history traits of Macrophthalmus japonicus according to environmental neterogeneity.
    Benthos Research  27-  1984
  • Life history trait changes among four seasonal generations of the mud flat auphipod, Corophium Volutator.
    Physiol. Ecol. Japan  21-  1984
  • Seaconal Changes of short-term reproductive cycle in Corophium volutator (Crustacea : Amphipoda). -Semi-lunar or lunar cycle?
    Publ. Amakusa Mar. Biol.  6-  (2)  1982
  • The adaptive significance of a lunar or semi-lunar reproductive cycle in marine animals
    Ecological Modeling  82-  41  -49

Research Grants & Projects

  • 河川生態系解析
  • 河口域生態系動態
  • 海底境界層における物質循環と生物撹乱
  • analysis on river ecosystem
  • Ecosystem dynamics in estuaries
  • The role of bioturbation in the material cycle in the bottom boundary layer

愛媛大学教員活動実績

教育活動(B)

担当授業科目(B01)

  • 2019, the first semester, under graduate, 新入生セミナーA
  • 2019, the first semester, under graduate, 環境を考える
  • 2019, the first semester, under graduate, 環境を考える
  • 2019, the first semester, master course, 生物環境科学高等実習Ⅱ
  • 2019, the first semester, master course, 生物学ゼミナールI
  • 2019, the first semester, master course, 生物学ゼミナールⅣ
  • 2019, the first semester, master course, 生物学課題実験I
  • 2019, the first semester, master course, 生物学課題実験Ⅳ
  • 2019, the first semester, under graduate, プロジェクト実践演習
  • 2019, the first semester, under graduate, 環境デザインフィールド実習Ⅰ
  • 2019, the first semester, under graduate, 生物学
  • 2019, the first semester, under graduate, 環境デザインゼミナールⅠ
  • 2019, the first semester, under graduate, 生物多様性保全学
  • 2019, the first semester, under graduate, 生物多様性保全学
  • 2019, the first semester, under graduate, 水域環境保全
  • 2019, the first semester, under graduate, 環境デザインゼミナールⅡ
  • 2019, the first semester, under graduate, 環境科学セミナーIII


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