• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

An estimate of genetic and ecological influence on the coldwater-adapted freshwater fishes by artificially induced environmental alterlations in river systems

Research Project

Project/Area Number 11660171
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field General fisheries
Research InstitutionHOKKAIDO UNIVERSITY

Principal Investigator

GOTO Akira  Hokkaido Univ., Grad.School of Fisheries Sciences, Asso.Prof., 水産科学研究科, 助教授 (30111165)

Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2000: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1999: ¥2,100,000 (Direct Cost: ¥2,100,000)
KeywordsObstructions across rivers / Interruption fish migration / Populational subdivision / Loss of genetic viriability / Change of life-history characters / Loss of biodiversity / Restoration of habitat diversity / Model for conservation of stream environments / 人為河川工作物 / 遡河回遊魚 / 陸封型形成 / 遺伝的分化 / 体サイズ小型化 / 生活史変化 / 環境影響評価
Research Abstract

In oder to estimate the genetic and ecological influence on coldwater-adapted fishes by artificially induced environmental alterlations in river systems, the comparative studies on life-history characteristics and genetic population structure were carried out for some targetting fishes inhabiting the artificially-altered reaches and naturally-meandering reaches, and flowing results were obtained :
(1) In the some rivers of southern Hokkaido Island, the population sizes, densities and habitat preferences of Lethenteron reissneri larvae were compared between those in artificially-straighten reaches by both the concrete-blocked banks and in naturally-meandering reaches. In consequence, the population sizes and densities of larvae were larger than those in the straitened reaches, mainly because more number of sandy-mud bottoms which were preferencially inhabited by the larvae were scattered in the former reaches. These results obtained from field survey and the other laboratory experiments … More of habitat preference suggest that Lethenteron reissneri larvae prefer to inhabit the sandy-mud bottoms composed of fine particle and deeper substrate.
(2) In the Nishitappu River, which is located near Tomakomai City and has a big weir constructed in 1957 at the middle course of the river, the genetic population structure and life-history characteristics were compared between the downstream anadromous population and the upstream river-resident population of threespined stickleback, Gasterosteus aculeatus. As the result, a significant difference was found in the allozymic gene frequency between the two populations. The upstream river-resident population showed smaller body size and higher age composition at breeding season than the downstream anadromous population. These results demonstrate that the land-locked population has evolved genetically and ecologically from the ancestral anadromous stock for about 40 years after the construction of weir.
(3) In three rivers of southern Hokkaido Island, the genetic variability within populations and genetic divergence among populations were compared using microsatellite DNA gene markers between the downstream anadromous and upstream river-resident populations of white-spotted charr, Salvelinus leucomaenis, which were separately distributed by dams. Consequently, the river-resident forms showed about 70% low mean heterozygosities, compared to those in the anadromous forms. Furthermore, the FST values (0.02-0.225) between the anadromous and river-resident forms clearly demonstrated that the latter forms were genetically divergent from the former forms. Statistic analyses indicate that the extent of genetic divergence between the two forms were positively correlated with the years for which the river-resident forms had been isolated from the anadromous forms, and negatively correlated with the whole waterflows in respecive rivers.
(4) On the basis of present study, artificially environmental alterations of river structures such as straightness of river courses and construction of weirs or dams are concluded to influence negatively on the biodiversity in coldwater-adapted fishes. Less

Report

(3 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • Research Products

    (26 results)

All Other

All Publications (26 results)

  • [Publications] Goto,A.: "Geographic distribution pattern of the fluvial sculpin, Cottus nozawae (Pisces : Cottidae), supporting its position as endemic to the Japanese Archipelago."Biogeography. (In press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yamada,M.: "Extensive introgression of mitochondrial DNA found between genetically divergent forms of threespine stickleback, Gasterosteus aculeatus, around Japan."Environmental Biology of Fishes. (In press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yagami,T.: "Patchy distribution of a fluvial sculpin, Cottus nozawae, in the Gakko River system at the southern margin of its native range."Ichthyological Research. 47(3). 277-286 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yamazaki,Y.: "Breeding season and nesting assemblages in two forms of Lethenteron reissneri, with reference to reproductive isolating mechanisms."Ichthyological Research. 47(3). 271-27 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yamamoto,S.: "Geographic variations in life history characteristics of white-spotted charr (Salvelinus leucomaenis)."Canadian Journal of Zoology. 77(6). 871-878 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yamamoto,S.: "Marine growth and survival of white-spotted charr, Salvelinus leucomaenis, in relation to smalt size."Ichthyological Research. 46(1). 85-92 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 後藤晃: "水生動物の卵サイズ-生活史の変異、種分化の生物学"海遊舎(印刷中). 257

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Goto, A., R.Yokoyama, Y.Yamazaki and H.Sakai: "Geographic distribution pattern of the fluvial sculpin, Cottus nozawae (Pisces : Cottidae), supporting its position as endemic to the Japanese Archipelago."Biogeography. (In press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yamada, M., M.Higuchi and A.Goto: "Extensive introgression of mitochondrial DNA found between genetically divergent forms of threespine stickleback, Gasterosteus aculeatus, around Japan."Environmental Biology of Fishes. (In press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yagami, T.and A.Goto: "Patchy distribution of a fluvial sculpin, Cottus nozawae, in the Gakko River system at the southern margin of its native range."Ichthyological Research.. 47(3). 277-286 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yamazaki, Y.and A.Goto: "Breeding season and nesting assemblages in two forms of Lethenteron reissneri, with reference to reproductive isolating mechanisms."Ichthyological Research.. 47(3). 271-276 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yamamoto, S., K.Morita and A.Goto: "Geographic variations in life history characteristics of white-spotted charr (Salvelinus leucomaenis)."Canadian Journal of Zoology. 77(6). 871-878 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yamamoto, S., K.Morita and A.Goto: "Marine growth and survival of white-spotted charr, Salvelinus leucomaenis, in relation to small size."Ichthyological Research. 46(1). 85-92 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Goto Akira: "Kaiyu-sha"Egg Sizes in Aquatic Animals : Biology of Life-history Variation and Speciation. 257 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Goto, A.: "Geographic distribution pattern of the fluvial sculpin, Cottus nozawae (Pisces : Cottidae), supporting its position as endemic to the Japanese Archipelago."Biogeography. (In press).

    • Related Report
      2000 Annual Research Report
  • [Publications] Yamada, M.: "Extensive introgression of mitochondrial DNA found between genetically divergent forms of threespine stickleback, Gasterosteus aculeatus, around Japan."Environmental Biology of Fishes. (In press).

    • Related Report
      2000 Annual Research Report
  • [Publications] Yagami, T.: "Patchy distribution of a fluvial sculpin, Cottus nozawae, in the Gakko River system at the southern margin of its native range."Ichthyological Research. 47(3). 277-286 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Yamazaki, Y.: "Breeding season and nesting assemblages in two forms of Lethenteron reissneri, with reference to reproductive isolating mechanisms."Ichthyological Research. 47(3). 271-279 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Yamamoto, S.: "Geographic variations in life history characteristics of white- spotted charr (Salvelinus leucomaenis)."Canadian Journal of Zoology. 77(6). 871-878 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] Yamamoto, S.: "Marine growth and survival of white-spotted charr, Salvelinus leucomaenis, in relation to smalt size."Ichthyological Research. 46(1). 85-92 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] 後藤 晃: "水生動物の卵サイズー生活史の変異、種分化の生物学"海遊舎(印刷中). 257

    • Related Report
      2000 Annual Research Report
  • [Publications] Yamazaki, Y.: "Geographic distribution patterns of the two genetically divergent forms of Lethenteron reissneri (Pisces : Petromyzontidae)"Biogeography. 1・1. 49-56 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Yamamoto, S.: "Geographic variations in life history characteristics of white-spotted charr (Salvelinus leucomaenis)"Can.J.Zool.. 77・6. 871-878 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Yamamoto, S.: "Marine growth and survival of white-spotted charr, Salvelinus leucomaenis, in relation to smolt size"Ichthyol.Res.. 46・1. 85-92 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Yamazaki, Y.: "Breeding season and nesting assemblages in two forms of Lethenteron reissneri, with reference to reproductive isolating mechanisms"Ichthyol.Res.. (In press).

    • Related Report
      1999 Annual Research Report
  • [Publications] 山崎祐治: "ヤツメウナギ類における系統分類と種文化研究の現状と課題"魚類学雑誌. (印刷中).

    • Related Report
      1999 Annual Research Report

URL: 

Published: 1999-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi