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首页> 外文期刊>Molecular ecology >The recent evolutionary origin of the phenotypically novel amphipod Hyalella montezuma offers an ecological explanation for morphological stasis in a closely allied species complex
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The recent evolutionary origin of the phenotypically novel amphipod Hyalella montezuma offers an ecological explanation for morphological stasis in a closely allied species complex

机译：表型上新颖的两栖动物Hyellaella montezuma的最新进化起源为紧密结盟的物种复合体中的形态停滞提供了生态学解释。

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摘要

Numerous molecular studies have identified morphologically cryptic, freshwater invertebrate species, but have not suggested possible mechanisms for their phenotypic stasis. The amphipod crustacean genus Hyalella contains numerous morphologically cryptic species in the H. azteca complex, as well as a small number of morphologically very divergent, narrowly endemic taxa. One such taxon, Hyalella montezuma , is the sole planktonic filter-feeder within the North American amphipod fauna, and is known only from Montezuma Well, a fishless travertine spring mound in Arizona, USA. In this study, we conduct a phylogenetic analysis of mtDNA sequence data using likelihood, Bayesian and cladistic approaches to determine both the relationship of H. montezuma to the H. 'azteca ' species complex, and to ascertain if its morphological and ecological differentiation have been comparatively recent. The results show that H. montezuma has a very close phylogenetic affiliation with one lineage in the H. azteca complex, indicating that its origin has been recent. We present evidence suggesting that fish predation is an important ecological factor, which constrains morphological and ecological diversification within the genus Hyalella , and that Montezuma Well has provided a relaxation on this constraint. [References: 47]
机译：大量的分子研究已经鉴定出形态学上隐秘的淡水无脊椎动物物种，但并未提出表型停滞的可能机制。两栖类甲壳动物类Hyalella属在Azteca复合体中包含许多形态上隐秘的物种，以及少数形态上非常分散的狭窄地方性分类群。一种这样的分类单元，Hyalella montezuma是北美两栖类动物区系中唯一的浮游性滤食动物，仅从美国亚利桑那州的无鱼洞石泉山蒙特祖玛井中知道。在这项研究中，我们使用似然，贝叶斯和进化论方法对mtDNA序列数据进行系统发育分析，以确定montezuma与H.'azteca'物种复合体的关系，并确定其形态和生态分化是否已经比较新。结果表明，H。montezuma具有非常紧密的亲缘关系，在Azteca复合体中有一个谱系，表明其起源是最近的。我们提供的证据表明，鱼类捕食是重要的生态因素，它限制了Hyalella属的形态和生态多样性，而Montezuma井为这一限制提供了放松。 [参考：47]

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