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Long-term dynamics of dimorphism in salmonid fishes in changing environment

Research Project

Project/Area Number 08454246
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 生態
Research InstitutionHOKKAIDO UNIVERSITY

Principal Investigator

MAEKAWA Koji  Hokkaido University, Fac of Agr.Aso.Prof., 農学部・附属演習林, 助教授 (80002301)

Co-Investigator(Kenkyū-buntansha) NAKANO Shigeru  Hokkaido University, Fac.of Agr.Asoc.Prof., 農学部・附属演習林, 助教授 (50217791)
GOTO Akira  Hokkaido University, Fac.of Fish., Asoc.Prof., 水産学部, 助教授 (30111165)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥7,600,000 (Direct Cost: ¥7,600,000)
Fiscal Year 1997: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1996: ¥6,200,000 (Direct Cost: ¥6,200,000)
Keywordsslmonid fishes / mature male parr / body size / sexual selection / finger printing DNA / reproductive success / changing environment / 閾値モデル
Research Abstract

1.The factors that affect reproductive behavior and success of precocious male parr in masu salmon, Oncorhynchus masou, were examinsd under experimental conditions.
2.Unlike other salmonid fishes, masu salmon parr were rarely attacked by dominant migratory males. Parr engaged in interactions among themselves to get close to the nest. As a result, the difference in the proximity to the nest resulted in the difference in average sneaking success at a nest.
3.The multivariate regression analyzes revealed selection favoring larger body size for gaining more proximate positions to the nest. A possible consideration is that an optimal body size exists for parr through natural and sexual selection within parr and between parr and migratory males.
No selection on the other morphological characters was detected. Since migratory males having longer snout and larger hump can acquire higher reproductive success, the evolutionary demands on parr might be different from that on migratory males.
4.In miyabe charr, fertilization success of mature male parr was measured by using finger printing DNA.The more numerous the number of mature male parrs, the higher the total fertilization success, but fertilization success per individual decrease. This suggest that existence of refuge around spawning ground plays an important role for life time reproductive success of mature male parr.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (25 results)

All Other

All Publications (25 results)

  • [Publications] Nakano, S: "Potential fragmentation and loss otthermal habitas for two charrspecies in the Japanese Archipelago due to climatic warinig" Freshwater Biolgy. 36. 711-722 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Katano, O: "Reproductive regulation in the female Japanese Minnow" Environmental Biology of Fishes. 49. 197-205 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Yamamoto, S: "The effect of birth date on growth of juvenie white-spotted charr Salvelinus leucomaenis" Fisheries Science. 63. 931-933 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Nakano, S: "Interspecific competition on and existence in freshwater dwelling Samonids-review" Japanese Journal of Ichthyology. 43. 59-78 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Takami, T: "Highwater temperature in fluences of foraging responses and thermal deaths of Dolly Varden and white-spotted charr" Fisheries Science. 63. 6-8 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Moekawa, K: "Moutain stream fish and effect of erosion control works" Sinsabou. 50. 61-66 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Fausch, K.D.: "Experimentally induced foraging mode shift by sympatric charrs in a Japanese moutain stream" Behavioural Ecology. 8. 414-420 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Ushio, N: "Influences of microhabitat use and foraging mode similarities on intra-and in terspecific agressive interaction" Ichthyological Research. 45. 19-28 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Nakano S., F.Kitano and K.Maekawa.: "Potential frogmentation and loss of thermal habitats for two charr species in the Japanese Archipelago due to climatic warming." Freshwater Biology. 36. 711-722 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Katano, O.and K.Maekawa: "Reproductive regulation in the female Japanese Minnow." Environmental Biology of Fishes. 49. 197-205 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Yamamoto, S,H.Shinomi and A.Goto: "The effect of Birth date on growth of Juvenile white-spotted charr Salvelinus leucomaenis" Fishries Science. 63. 931-933 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Nakano, S.and Y.Taniguchi: "Interspecific competition and existence in freshwater-dwelling salmonids : review." Japan. J.Ichthyol.43. 59-78 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Takami, T., F.Kitano and S.Nakano: "High water temperature infuluences on foraging responses and thermal deaths of Dolly varden salvelinus malma and white-spotted charr S,leucomaebis in a laboratory." Fisheires Science. 63. 6-8 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Maekawa, K.and G.Takahashi: "Mountain stream fish and effect of erosion control works." Shinsabou. 50. 61-66 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Fausch, K.D., S.Nakano and S.Kitano: "Experimentally induced foraging mode shift by sympatric charrs in a Japanese mountain stream." Behavioral Ecology. 8. 414-420 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] N.Ushio and S.Nakano: "Influences of microhabitat use and foraging mode similarities on intra-and interspecific aggressive interactions in a size-structureed stream fish assemblage." Ichthyological Research. 45. 19-28 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Yamamoto,S.: "The effect of Birth date on growth of Juvenile white-spotted charr salvelinus leucomaenis." Fishries Science. 63. 931-933 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Nakano,S.: "Interspecific competition and existence in freshwater-dwelling salmonids." review.Japan J.Ichthyol.43. 59-78 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Takami,T.: "High water temperature infuluences on foraging responses and thermal deaths of Dolly varden salvelinus malma and white-spotted charrs.leucomaenis in a laboratory." Fisheires Science. 63. 6-8 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Maekawa,K.: "Mauntain stream fish and effect of erosion control works." Shinsabou. 50. 61-66 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Ushio,N.: "Influences of microhabitat use and foraging mode similarities on intra-and interspecific aggressive interactions in a size-structureed stream fish assemblage." Ichthyological research. 45. 19-28 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] Nakano,Shigeru: "Potential fragmentation and loss of thermal habitants fr charrs in the Japanese archipelagd duo to climatic warming" Freshwater Brology. 36 (3). 711-722 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Fausch, K.D.: "A field experiment on foraging mode shifts by sympatric charrs in a Japanese mountain stream" Behaviol Ecology. (in press). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] Nakano, Shigeru: "Competitive interaction for foraging microhabitat among exotic brook charr, Salvelinus fontinalis, native bull charr, S.confluentus, and westslope cut : throat trout, Oncorhynchus clarki lewlsi, in a Montana stream" Environmental Biology of Fishes. (in press). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] Goto, Akira: "Life-history variations in the fluvial sculpin, Cottus nozawae (Cottidae), along the course of a small mountain stream" Environmental Biology of Fishes. (in press). (1997)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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