2005 Fiscal Year Final Research Report Summary
Biodiversity and origin of freshwater fishes in the Far-Eastern Asia
| Project/Area Number |
15405008
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
Ecology/Environment
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| Research Institution | HOKKAIDO UNIVERSITY |
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Principal Investigator |
GOTO Akira Hokkaido Univ., Field Sci.Cent., Asso.Prof., 北方生物圏フィールド科学センター, 助教授 (30111165)
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| Co-Investigator(Kenkyū-buntansha) |
SAKAI Harumi National Fisheries Univ., Applied Aquabiol., Prof., 生物生産学科, 教授 (80399659)
IWATA Akihisa Kyoto Univ., Grad.School of Asian & African, Asso.Prof., 大学院・アジア・アフリカ地域研究研究科, 助教授 (20303878)
MORI Seiichi Gifu Keizai Univ., Fac, of Ecomonics, Prof., 経済学部, 教授 (50308657)
WATANABE Katsutoshi Kyoto Univ., Grad.School of Science, Asso.Prof., 大学院・理学研究科, 助教授 (00324955)
YAMAZAKI Yuji Toyama Univ., Fac.of Science, Assistant Prof., 理学部, 助手 (30332654)
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| Project Period (FY) |
2003 – 2005
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| Keywords | Freshwaters in Eastern Asia / Ichthyofauna / Species diversity / Genetic diversity / Eco-behavioural diversity / Phylogeographic pattern / Life-history evolution / Origin of biodiversity |
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| Research Abstract |
In order to elucidate the biodiversity and origin of species diversity of freshwater fishes with high endemism in Far-Eastern Asia, genetic, morphological, ecological and ethological studies were carried out in Japan, Russia, Kazafstan and Taiwan, and as the results following valuable results were obtained :
1) For the phylogenetic relationships among Lethenteron species in East Asia, it was elucidated that L.japonicum, L.kessleri and L.sp. N were monophyletic and L.sp.S derived from the common ancestral stock of the genera, Lethenteron, Lampetra and Entosphenus.
2) It was found that crucian carps collected from the Ob River system in Kazafstan consisted of Carassius carassius and C.auratus, the latter including two groups at least ; one is native in Kazafstan and another is introduced presumably from China.
3) East Asian ninespine sticklebacks (genus Pungitius) were composed of 3 major lineages (A. B and C). A linearized molecular clock tree based on AFLP data disclosed that the lineage
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A and (B+C) were diverged about 3.0 MYA, and lineages B and C were diverged 2.2 MYA.
4) MtDNA sequence data disclosed that East Asian bagrid catfishes (Pseudobagrus-group) includes two major monophyletic lineages and that one of them is distributed in the whole range, including so-called Pseudobagrus, Peltobagrus and Coreobagrus, and the other consists of Chinese Leiocassis and some Pseudobagrus species.
5) MtDNA sequence data disclosed that eastern Eurasian freshwater sculpins (genera Cottus and Trachidermus) include 5 major lineages A-E, lineage A consisting of T.fasciatus and C.kazika having a catadromous life-history, and lineages B-E consisting of the remaining Cottus species having amphidromous, lacustrine and fluvial life-histories.
6) A comparative analysis of the relationship between genetic and phenotypic divergence in multiple sympatric pairs of threespine sticklebacks (the Pacific Ocean and Japan Sea forms of Gasterosteus aculeatus complex) disclosed that body size of fish may play an important role at the early stage of stickleback speciation and divergence of courtship repertories play an important role at the later stage. Less
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