Divergence of ovipositor length and egg shape in a brood parasitic bitterling fish through the use of different mussel hosts
Divergence of ovipositor length and egg shape in a brood parasitic bitterling fish through the use of different mussel hosts
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DOI：
10.1111/j.1420-9101.2011.02453.x
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发表时间：
2012-03-01
影响因子：
2.1
通讯作者：
Sota, T.
中科院分区：
文献类型：
--
作者：
Kitamura, J.;Nagata, N.;Sota, T.
苦鱼使用长产卵器将卵产在活贝的鳃上。我们研究了产卵器长度 (OL) 和卵形状是否与日本塔比拉苦鳅 (Acheilognathus tabira) 种群中贻贝科寄主贻贝物种的差异相关。使用无齿贻贝亚科贻贝的苦味种群比使用无齿贻贝亚科贻贝的苦味种群拥有更长的产卵器和更长的卵，正如从各亚科之间寄主大小差异所预期的那样（无齿贻贝比无齿贻贝更大）。基于 A. tabira 种群的稳健系统发育，我们证明 OL 和卵形状的进化与宿主差异相关，但彼此之间不相关，这表明这些性状是独立选择的。我们的研究表明，由于不同的宿主可用性和/或宿主的种间竞争，巢寄生的适应性特征可能如何随着宿主的转移而出现差异。
Bitterling fishes deposit their eggs on the gills of living mussels using a long ovipositor. We examined whether ovipositor length (OL) and egg shape correlated with differences in host mussel species in the family Unionidae among populations of the tabira bitterling (Acheilognathus tabira) in Japan. Bitterling populations that use mussels in the sub-family Anodontinae possessed longer ovipositors and more elongated eggs than those using mussels of Unioninae, as expected from the difference in host size between the sub-families (anodontine mussels are larger than unionine mussels). Based on a robust phylogeny of A. tabira populations, we demonstrated that the evolution of both OL and egg shape were correlated with host differences, but not with each other, suggesting that these traits have been selected for independently. Our study demonstrates how adaptive traits for brood parasitism may diverge with host shift due to different host availability and/or interspecific competition for hosts.