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クメ マナブ
Manabu Kume
久米 学 所属 石巻専修大学 理工学部 職種 准教授 |
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| 言語種別 | 英語 |
| 発行・発表の年月 | 2021/01 |
| 形態種別 | 研究論文（学術雑誌） |
| 査読 | 査読あり |
| 標題 | Patterns of genomic divergence and introgression between Japanese stickleback species with overlapping breeding habitats |
| 執筆形態 | 未選択 |
| 掲載誌名 | Journal of Evolutionary Biology |
| 掲載区分 | 国外 |
| 出版社・発行元 | Wiley |
| 巻・号・頁 | 34(1),pp.114-127 |
| 著者・共著者 | Mark Ravinet,Manabu Kume,Asano Ishikawa,Jun Kitano |
| 概要 | With only a few absolute geographic barriers in marine environments, the factors maintaining reproductive isolation among marine organisms remain elusive. However, spatial structuring in breeding habitat can contribute to reproductive isolation. This is particularly important for marine organisms that migrate to use fresh- or brackish water environments to breed. The Japanese Gasterosteus stickleback species, the Pacific Ocean three-spined stickleback (G. aculeatus) and the Japan Sea stickleback (G. nipponicus) overwinter in the sea, but migrate to rivers for spawning. Although they co-occur at several locations across the Japanese islands, they are reproductively isolated. Our previous studies in Bekanbeushi River showed that the Japan Sea stickleback spawns in the estuary, while the Pacific Ocean stickleback mainly spawns further upstream in freshwater. Overall genomic divergence was very high with many interspersed regions of introgression. Here, we investigated genomic divergence and introgression between the sympatric species in the much shorter Tokotan River, where they share spawning sites. The levels of genome-wide divergence were reduced and introgression was increased, suggesting that habitat isolation substantially contributes to a reduction in gene flow. We also found that genomic regions of introgression were largely shared between the two systems. Furthermore, some regions of introgression were located near loci with a heterozygote advantage for juvenile survival. Taken together, introgression may be partially driven by adaptation in this system. Although, the two species remain clearly genetically differentiated. Regions with low recombination rates showed especially low introgression. Speciation reversal is therefore likely prevented by barriers other than habitat isolation. |
| DOI | 10.1111/jeb.13664 |
| ISSN | 1010-061X/1420-9101 |
| PMID | 32557887 |
| PermalinkURL | https://onlinelibrary.wiley.com/doi/pdf/10.1111/jeb.13664 |
| researchmap用URL | https://onlinelibrary.wiley.com/doi/full-xml/10.1111/jeb.13664 |