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1995 Fiscal Year Final Research Report Summary

Studies on genetic variability and its significance in population ecology of wildlife

Research Project

Project/Area Number 05454011
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 生態
Research InstitutionNational Institute Environmental Studies

Principal Investigator

TSUBAKI Yoshitaka  National Institute for Environmental Studies, Global Environment Research Group, Head Researcher, 地球環境研究グループ, 総合研究官 (30108641)

Co-Investigator(Kenkyū-buntansha) TOMIYAMA Kiyonori  Ibaraki University, Faculty of Science, Assistant Professor, 理学部, 助手 (30272107)
NAGATA Hisashi  National Institute for Environmental Studies, Global Environment Research Group,, 地球環境研究グループ, 主任研究員 (00202226)
TAKAMURA Kenzi  National Institute for Environmental Studies, Global Environment Research Group,, 地球環境研究グループ, 主任研究員 (40163315)
Project Period (FY) 1993 – 1995
Keywordswildlife / genetic variability / fluctuating asymmetry / natural selection / sexual selection / conservation biology / population / viability
Research Abstract

Genetic stochasticity is one of many potential causes of extinction in samall populations. The objects of this research is to know how genetic variability changes according to the reduction of population size or habitat destruction, and how the decrease in genetic variability influences the reproductive output of animals.
In the process of population decrease, populations may suffer a significant genetic deterioration, namely a decrease in genetic variability, which may lead to a corresponding decrease in fitness (survival and reproduction). As Fitness can often be measured as fluctuating asymmetry (FA), we analyzed FA in relation to various fitness-related characters, such as survival growth rate, territoriality and/or reproductive success in several animals. We found negative correlation between mating success and FA in insects including dragonflies, butterflies and midges. FA measurements on several passerine birds revealed that population density and the distribution ranges were negatively correlated with population mean of FA.
FA may be influenced both by genetic and environmental stresses. We tested the effect of density on the growth and FA of a fish (Oryzias latipes). As a result, we detected density effects on average growth rate but not on FA.This suggests that a genetic effect is more important in the mediation of FA than density (environmental) effect at least in this species.

  • Research Products

    (26 results)

All Other

All Publications (26 results)

  • [Publications] Y. TSUBAKI: "On the cue for male territorial site selection in the dragonfly, Nannoplpygmaea: A field experiment." J. Ethol. 13. 105-111 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 椿 宜高: "生物の左右対称性のゆらぎ:保全生物学と性洶汰理論の新しい小道具" 科学. 65. 584-594 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K. TAKAMURA: "Chironomids fail to emerge from LAS-contaminated water" Ecotoxicology. 4. 245-257 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K. TAKAMURA: "Life cycle of the damselfly Calopteryx atrata in relation to pesticide contamination." Ecotoxicology. 4(印刷中).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K. TAKAMURA: "Changes in sex ration of chironomid imagines from rice field waters." Archie for Hydrobiologie. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K. Tomiyama: "Mate choice in a protandrous simultaneously formaphrodditic land snale Acatina frica(Ferusace)(Stylommatophora:Achatinidae)" Journal of Molluscan Studies. 62. (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y. TSUBAKI: "The ecology and evolutionary biology of swallowtail bitterflies." Scientific Publishers, 455 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tsubaki Y., M.T.Siva-Jothy & T.Ono: "Re-copulation and post-copulatory mate guarding increase immediate female reproductive output in the dragonfly, Nannophya pygmaea Rambur" Behavioral Ecology and Sociobiology. 35. 219-225 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Matsumoto K.F.Ito & Y.Tsubaki: "Egg cluster size variation in relation to the larval food abundance in Luehdorfiapuziloi (Lepidoptera : Papilionidae)" Researches on Population Ecology. 35. 325-333 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Siva-Jothy M.T.& Y.Tsubaki: "Sperm competition and sperm precedence in the dragonfly Nannophya pygamea" Physiological Entomology. 19. 363-366 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Scriber J.M., Y.Tsubaki, R.: "Lederhouse, The ecology and evolutionary biology of swallowtail bitterflies" Scientific Publishers. 455 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tsubaki Y.& T.Ono: "On the cue for male territorial site selection in the dragonfly, Nannophya pygmaea A field experiment" Journal of Ethology. 13. 105-111 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takamura K.: "Population changes among chironomid species related to secondary effects of pesticide application in rice fields." Archiv fur Hydrobiologie. 127. 205-225 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takamura K.: "Chironomids fail to emerge from LAS-contaminated water" Ecotoxicology. 4. 245-257 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takamura, K.: "Life cycle of the damselfly Calopteryx atrata in relation to pesticide contamination" Ecotoxicology. 4 : (in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takamura, K.: "Changes in sex ration of chironomid imagines from rice field waters" Archiv fur Hydrobiologie. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nagata, H.: "The structure of a local population and dispersal pattern in the Styan's Grasshopper Warbler, Locustella pleskei." Ecological Research. 8. 1-9 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Eguchi, K., M.Takesishi, & H.Nagata: "Conservation of wintering hooded cranes In Yashiro, Japan" Journal of Yamashina Institute of Ornithology. 25. 157-165 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Eguchi, K., H.Nagata, & S.Yamagishi: "The mixed species flock of birds in a deciduous dry forest in Madagascar" Japanese Journal of Ornithology. 42. 27-29 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nagata, H., A.Zubaid, & H.I.Azarae: "Changes of foraging guild structures of understory bird community in virgin and disturbed rainforests at Peninsula Malaysia" J.Ornithol. (suppl.). 135 : 223 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tomiyama K.& Nakane M.: "Dispersal patterns of the giant African sanil, Achatina fulica (Gastropoda, Pulmonata), equipped with a radio-transmitter" J.Molluscan Studies. 59. 315-322 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Asami T., Fukuda H., Tomiyama K.: "The inheritance of shell banding in the land snail Bradybaenapellucida" Venus. 52. 155-159 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tomiyama K.: "Homing behavior of the giant African snail, Achatina fulica (Ferussac) (Gastropoda ; Pulmonata)" J.Ethol.10. 139-147 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tomiyama, K.: "Growth and maturation pattern in the African giant snail, Achatina fulica (Ferussac) (Stylommatophora : Achatinidae)" Venus. 52. 87-100 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tomiyama, K.: "Courtship behavior of the giant African snail, Achatina fulica (Ferusacc) (Stylommatophora : Achatinidae) in the field" J.Moll.Stud.60. 47-54 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tomiyama, K.: "Mate choice in a protandrous simultaneously hermaphrodditic land snale Acatina frica (Ferusacc) (Stylommatophora : Achatinidae)" Journal of Molluscan Studies. 62 (in press).

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1997-03-04  

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