Biogeographical history of northeastern Asiatic soricine shrews (insectivora, mammalia) |
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Authors: | Satoshi Ohdachi Ryuichi Masuda Hisashi Abe and Nikolai E Dokuchaev |
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Institution: | (1) Institute of Low Temperature Science, Hokkaido University, Kitaku, 060 Sapporo, Japan;(2) Chromosome Research Unit, Faculty of Science, Hokkaido University, Kitaku, 060 Sapporo, Japan;(3) Laboratory of Applied Zoology, Faculty of Agriculture, Hokkaido University, Kitaku, 060 Sapporo, Japan;(4) Institute of Biological Problems of the North, 68510 Magadan, Russia;(5) Present address: Katsuraoka 26-17, 047-02 Otaru, Japan |
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Abstract: | A hypothetical biogeographical history of northeastern Asiatic soricine shrews in the late Quaternary was developed by integrating
their present distributions, fossil records, a hypothetical phylogeny, and geological investigations. First, a biological
area cladogram of the northeastern Asiatic region was constructed by applying the vicariance hypothesis to the phylogeny of
thecaecutiens/shinto group, a monophyletic group proposed by Ohdachi et al. (1997). Comparing the biological area cladogram with a geological
hypothesis by Ohshima (1990,1991,1992), we hypothesized a geographical history of northeastern Asia. Species were then located
on the dendrogram of the geographical history, referring to the present distributions, fossil records, and phylogeny of shrews.
According to our hypothesis, higher species diversity of the northern region of northeastern Asia (Hokkaido, Sakhalin, and
Eastern Siberia) was achieved by several series of colonizations and habitat expansion. On the other hand, the shrew communities
of the southern region (Honshu, Sado, Shikoku, and Kyushu) were created by extinction and isolation followed by speciation. |
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Keywords: | biogeography Eurasia phylogeny Soricinae species diversity |
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