Variability of sexual organ possession rates and phylogenetic analyses of a parthenogenetic Japanese earthworm, Amynthas vittatus (Oligochaeta : Megascolecidae)
スポンサーリンク
概要
- 論文の詳細を見る
Although earthworms are hermaphroditic animals with biparental sexual reproduction, some parthenogenetic species have been found. Evolutionary trends in parthenogenetic earthworms revealed a reduction in the reproductive organs. To clarify the phylogenetic relationships of parthenogenetic earthworms with different degree of degraded reproductive organs, we conducted a morphological analysis of the reproductive organs and molecular phylogenetic analyses of Amynthas vittatus which usually degraded a part of reproductive organs. Morphological analysis revealed that almost all individuals collected around Mt. Aobayama, Sendai city of northeastern Japan, possessed male pores, while individuals collected from areas located across Hirose River did not. Phylogenetic analysis using mitochondrial DNA sequences of 48 individuals representing 20 populations indicated that almost all individuals collected around Mt. Aobayama belonged to a different lineage from the other populations collected around Sendai, and that almost all individuals collected from across Japan belonged to the latter lineage. We suggest that the difference in the male pore possession rate was caused by histories of each population, but the A. vittatus population found on Mt. Aobayama belongs to a different lineage as compared to the other Japanese populations and not the primitive population. Thus, the parthenogenetic earthworm A. vittatus has undergone at least two morphological evolutionary processes.
- 日本遺伝学会の論文
- 2011-02-25
著者
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HAYAKAWA Hiroshi
Faculty of Agriculture, Kochi University
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FUKUDA Tatsuya
JST Innovation Satellite Kochi
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Minamiya Yukio
Faculty Of Agriculture Kochi University
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Fukuda Tatsuya
Forestry Science Institute Graduate School Of Agriculture Kochi University
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Fukuda Tatsuya
Department Of Ecology And Evolutionary Biology Graduate School Of Life Sciences Tohoku University
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Ogawa Kohei
Faculty Of Agriculture Kochi University
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Hayakawa Hiroshi
The United Graduate School of Agricultural Science, Ehime University
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Ohga Kyohei
Faculty of Agriculture, Kochi University
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Shimano Satoshi
Miyagi University of Education
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Fukuda Tatsuya
Faculty of Agriculture, Kochi University
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Ito Masamichi
Faculty Of Economics Surugadai University
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Hayakawa Hiroshi
The United Graduate School Of Agricultural Science Ehime University
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Shimano Satoshi
Miyagi Univ. Of Education
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Fukuda Tatsuya
Faculty Of Agriculture Kochi University
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