Depth-dependent abundance of Midas Cichlid fish (Amphilophus spp.) in two Nicaraguan crater lakes
Depth-dependent abundance of Midas Cichlid fish (Amphilophus spp.) in two Nicaraguan crater lakes
复制标题
尼加拉瓜两个火山口湖中米达斯丽鱼科鱼（Amphilophus spp.）的丰度随深度的变化
作者：
M. Dittmann;Marius Roesti;A. Indermaur;M. Colombo;M. Gschwind;I. Keller;Robin Kovac;M. Barluenga;Moritz Muschick;W. Salzburger
Midas Cichlid species complex（Amphilophus spp.）在中美洲，作为一个突出的模型系统，研究同域物种形成和平行适应辐射，因为小阵列的等效生态型变体已经独立地在不同的火山口湖泊。虽然不同物种的分类和进化历史得到了很好的解决，但对Midas Cichlid组合的基本生态参数知之甚少。在这里，我们使用的线样调查，调查的深度依赖丰富的双冠属。沿着阿波约和希洛阿这两个巴布亚火山口湖的岸边。我们发现一个相当高的密度米达斯慈鲷在希洛阿湖相比，阿波约湖，特别是在最浅的深度水平。这可能是由于希洛阿湖的富营养化程度较高，以及与此相关的食物供应差异，和/或该湖存在更大的生态位多样性。在任何情况下，收敛的形式进化，尽管在大小，年龄，富营养化水平和承载能力的显着差异。此外，我们的数据提供了丰富的和密度的估计Midas慈鲷鱼，作为这些生态系统的未来调查的基线，也与过去和未来的生态物种形成的建模。
The Midas Cichlid species complex (Amphilophus spp.) in Central America serves as a prominent model system to study sympatric speciation and parallel adaptive radiation, since small arrays of equivalent ecotype morphs have evolved independently in different crater lakes. While the taxonomy and evolutionary history of the different species are well resolved, little is known about basic ecological parameters of Midas Cichlid assemblages. Here, we use a line transect survey to investigate the depth-dependent abundance of Amphilophus spp. along the shores of two Nicaraguan crater lakes, Apoyo and Xiloá. We find a considerable higher density of Midas cichlids in Lake Xiloá as compared to Lake Apoyo, especially at the shallowest depth level. This might be due to the higher eutrophication level of Lake Xiloá and associated differences in food availability, and/or the presence of a greater diversity of niches in that lake. In any case, convergent forms evolved despite noticeable differences in size, age, eutrophication level, and carrying capacity. Further, our data provide abundance and density estimates for Midas Cichlid fish, which serve as baseline for future surveys of these ecosystems and are also relevant to past and future modeling of ecological speciation.