Convergent Patterns of Body Shape Differentiation in Four Different Clades of Poeciliid Fishes Inhabiting Sulfide Springs
Convergent Patterns of Body Shape Differentiation in Four Different Clades of Poeciliid Fishes Inhabiting Sulfide Springs
复制标题
硫化物泉四类不同支系鱼类体形分化的趋同模式
DOI：
10.1007/s11692-011-9129-4
复制
发表时间：
2011
影响因子：
2.5
通讯作者：
Logan Hastings
中科院分区：
文献类型：
--
作者：
M. Tobler;Logan Hastings
我们调查了四个谱系的livebearing鱼类（两个属Poecilia和两个食蚊鱼），居住在淡水栖息地，也殖民硫化物泉在俄克拉荷马州，墨西哥和委内瑞拉的复制分化。硫化物温泉的特点是极端缺氧和高浓度的有毒硫化氢，这提供了一个强大的来源，与邻近的非硫化物栖息地的分歧选择。使用几何形态分析的身体形状，我们发现，硫化物泉种群显着不同的亲属从定期淡水栖息地在所有四个谱系调查。分化的特点是强大的趋同进化模式，硫化物弹簧人口一贯表现出头部大小的增加，即使幅度和性质的差异各不相同的血统。头部大小是密切相关的鳃大小的增加，在硫化物春天种群的属孔雀鱼，这有利于有效的氧气收购在缺氧的硫化氢环境，并直接影响生存。分化的收敛模式支持以前的发现硫化物对性状进化的影响。
We investigated replicated differentiation in four lineages of livebearing fishes (two with the genus Poecilia and two within Gambusia), which inhabit freshwater habitats and have also colonized sulfide springs in Oklahoma, Mexico, and Venezuela. Sulfide springs are characterized by extreme hypoxia and high concentrations of toxic hydrogen sulfide, which provide a strong source of divergent selection compared to adjacent non-sulfidic habitats. Using geometric morphometric analysis of body shape, we found that sulfide spring populations significantly differ from relatives from regular freshwater habitats in all four lineages investigated. Differentiation is characterized by strong patterns of convergent evolution, with sulfide spring populations consistently exhibiting an increase in head size, even though the magnitude and nature differences varied across lineages. Head size is strongly correlated with an increase in gill size in sulfide spring populations of the genus Poecilia, which facilitates efficient oxygen acquisition in the hypoxic H2S-environment and directly affects survival. The convergent patterns of differentiation support previous findings about the effects of sulfide on trait evolution.