精靈箭毒蛙 (Ranitomeya imitator)的擬態斑紋產生的生殖隔離可能導致族群種化
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| photo from content a)表示精靈箭毒蛙 (R. imitator) b) 表示其model 皇冠箭毒蛙 (R. fantastica) 與 齊亞曼箭毒蛙 (R. variabilis) c) 兩型的分佈與雜交帶是意圖 d) 雜交帶出現的精靈箭毒蛙的多態型 e) 研究區域 |
標題：Reproductive isolation related to mimetic divergence in the poison frog Ranitomeya imitator
摘要
In a mimetic radiation—when a single species evolves to resemble different model species—mimicry can drive within-species morphological diversification, and, potentially, speciation. While mimetic radiations have occurred in a variety of taxa, their role in speciation remains poorly understood. We study the Peruvian poison frog Ranitomeya imitator, a species that has undergone a mimetic radiation into four distinct morphs. Using a combination of colour–pattern analysis, landscape genetics and mate-choice experiments, we show that a mimetic shift in R. imitator is associated with a narrow phenotypic transition zone, neutral genetic divergence and assortative mating, suggesting that divergent selection to resemble different model species has led to a breakdown in gene flow between these two populations. These results extend the effects of mimicry on speciation into a vertebrate system and characterize an early stage of speciation where reproductive isolation between mimetic morphs is incomplete but evident.
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| photo from content 各種不同參數的比較結果 |
討論擬態、種化與族群遺傳研究目前只有毒蝶 (Heliconius)比較多，精靈箭毒蛙的例子與毒蝶的例子很相似，不同區域擬態不同的物種，但對於不同族群間的遺傳結構，基因有沒有在族群間交流還不清楚。這個研究透過比較各種參數，像是微衛星體、身體的顏色與樣式、雄性的體重等等，顯示這個族群間只有很狹隘的雜交帶，各族群間已經有十分顯著的差異。這跟毒蝶的例子相似，可能是一個因為擬態的斑紋侷限族群的分佈，進而產生地理隔離種化的例子。
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| photo from content 此圖說明不同擬態型的精靈箭毒蛙的遺傳結構 |
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