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首页> 外文期刊>Copeia >Hybridization of Lythrurus fasciolaris and Lythrurus umbratilis (Cypriniformes : Cyprinidae) in the Ohio River Basin
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Hybridization of Lythrurus fasciolaris and Lythrurus umbratilis (Cypriniformes : Cyprinidae) in the Ohio River Basin

机译：俄亥俄河流域的水链天狼星和伞状天狼星（Cyprinformes：Cyprinidae）杂交

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摘要

The Scarlet Shiner (Lythrurus fasciolaris) and Redfin Shiner (L. umbratills) are common small minnow species usually exhibiting a parapatric geographic distribution within the Ohio River basin. Historical collection records suggest several areas of possible syntopy along the periphery of distributional ranges, with suspected hybridization based upon observed intermediate morphology of nuptial males. Nuptial males from nine localities with suspected hybridization were collected in June and July 2004; morphometric, meristic, tuberculation, and coloration data were collected and analyzed to test the hypothesis that these species are hybridizing. Based on univariate and multivariate analyses and qualitative assessment of the morphological data, the Green River, Kentucky River, and Salt River drainages in Kentucky and the Scioto River drainage in Ohio all have populations with evidence of past gene flow. Comparisons of current observations with historical collections show an eastward range expansion of L. umbratilis with replacement of L. fasciolaris. The introgression of morphological characters toward those of L. umbratilis in the Green River, Salt River, and Scioto River drainages imply that hybridization may play a direct role in this range expansion. The novel morphology of specimens from Eagle Creek, Kentucky River drainage suggests that hybridization also has resulted in the development of a static, morphologically distinct hybrid swarm. In each case, environmental conditions seem closely linked with the occurrence and net effects of hybridization between these two species.
机译：猩红光泽（Lythrurus fasciolaris）和Redfin Shiner（L. umbratills）是常见的小min鱼，通常在俄亥俄河流域内表现出超自然地理分布。历史收集记录表明，沿分布范围的外围可能存在一些可能的同义区域，并根据观察到的成年雄性的中间形态，怀疑杂交。 2004年6月和2004年7月，从九个地方的怀疑杂交的男子中收集了这些雄性。收集形态学，形态学，结节病和着色数据，并进行分析以检验这些物种正在杂交的假说。根据单变量和多变量分析以及对形态学数据的定性评估，肯塔基州的格林河，肯塔基河和盐河流域以及俄亥俄州的Scioto河流域都有种群，这些种群具有过去基因流的证据。当前观测值与历史记录的比较显示，伞形乳杆菌向东扩展，并取代了片状乳杆菌。绿河，盐河和Scioto河排水系统中的形态特征向伞形菌的渗入暗示着杂交可能在此范围扩展中起直接作用。来自肯塔基河伊格尔河的标本的新形态表明，杂交也导致了静态的，形态上不同的杂种群的发展。在每种情况下，环境条件似乎都与这两个物种之间杂交的发生和净效应紧密相关。

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