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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Incipient speciation ： ウィキペディア英語版 Incipient speciation Incipient speciation is the evolutionary process in which new species form but are still capable of interbreeding; it can be the first part of the larger process of speciation. Incipient speciation can arise from natural selection and/or genetic drift, and is further reinforced by these factors, as well as others, such as sexual selection. Examples of incipient speciation in nature are the focus of much biological research. == Initiation == Two populations of a species can begin speciation by adapting to ecological niches that differ spatially, temporally, or in the amount or type of resources, predators, parasites, etc. This is known as ecological speciation. An example is the fish ''Gobiomorphus cotidianus'' of New Zealand. Within the same rivers live migratory and non-migratory populations, and these populations, although of the same species, are genetically distinct and spawn in different seasons.〔Michel, C., Hicks B.J., Stölting, K.N., Clarke, A.C., Stevens, M.I., Tana, R., Meyer, A., van den Heuvel, M.R. (2008). “Distinct migratory and non-migratory ecotypes of an endemic New Zealand eleotrid (''Gobiomorphus cotidianus'') – implications for incipient speciation in island freshwater fish species.” ''BMC Evolutionary Biology'', 8:49.〕 Geographically isolated populations can also begin speciation simply through random genetic drift. Isolated populations can diverge more quickly if they have differing resources, however, as they adapt through natural selection to their different environments (ecological speciation). This has been described in the mosquitofish of the blue holes of the Bahamas. Isolated populations in holes with different predators diverge much more quickly than isolated populations with the same predators.〔Langerhans, R.B., Gifford, .M.E., Joseph, E.O. (2007). “Ecological speciation in ''Gambusia'' fishes.” ''Evolution'', 61(9):2056-2074.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Incipient speciation」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.