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Divergence of egg shape in a bitterling fish through coevolution with mussel hosts

苦鱼与贻贝宿主共同进化导致卵形状的差异

基本信息

批准号：
20770014
负责人：
KITAMURA Jyun-ichi
金额：
$ 2.75万
依托单位：
Toho University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Young Scientists (B)
财政年份：
2008
资助国家：
日本
起止时间：
2008 至 2010
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20770014/
关键词：
淡水魚類淡水二枚貝類共進化資源選択寄生淡水魚淡水二枚貝

项目摘要

Bitterling fishes deposit their eggs on the gills of living mussels using a long ovipositor. Bitterling egg shape is highly variable and may have an adaptive significance in preventing ejection by mussel hosts. We examined whether egg shape among populations of the tabira bitterling (Acheilognathus tabira) in Japan correlated with differences in host mussel species in the family Unionidae. Bitterling populations using mussels in the sub-family Anodontinae possessed longer ovipositors and more elongated eggs than those using mussels in the Unioninae. Based on a robust phylogeny of A.tabira populations, we demonstrated that evolution of elongated and globular eggs has occurred repeatedly in different A.tabira lineages corresponding with the use of anodontine and unionine mussels. The evolution of both ovipositor length and egg shape were correlated with host differences, but not with each other, suggesting that these traits have been selected independently.

苦味鱼用长的产卵器将卵存款在活贻贝的鳃上。苦蛋形状是高度可变的，可能有一个适应性的意义，防止喷射贻贝主机。我们研究了日本塔比拉鱼（Acheilognathus塔比拉）种群之间的卵形是否与蚌科中宿主贻贝物种的差异相关。苦人口使用贻贝的亚科Anodontinae拥有较长的产卵器和更细长的鸡蛋比那些使用贻贝的Unioninae。基于A.塔比拉种群的强大的进化，我们证明了在不同的A.塔比拉谱系中重复发生了细长和球形卵的进化，与无齿蚌和单齿蚌的使用相对应。产卵器长度和卵形的进化与寄主差异相关，但相互之间不相关，表明这些性状是独立选择的。