Parallel life history evolution in mouthbrooding cichlids from the African Great Lakes
Parallel life history evolution in mouthbrooding cichlids from the African Great Lakes
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DOI：
10.1073/pnas.0802343105
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发表时间：
2008-10-07
影响因子：
11.1
通讯作者：
Turner, George F.
中科院分区：
文献类型：
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作者：
Duponchelle, Fabrice;Paradis, Emmanuel;Turner, George F.
古代深水湖的存在为研究水生生物对远洋、底栖和岩岸生境的独立适应提供了机会。非洲五大湖区马拉维、坦噶尼喀和维多利亚的许多特有的丽鱼种类，为这种进化过程的比较研究提供了重要的资源。在这里，我们表明，在不同湖泊的岩石海岸和远洋栖息地定居的丽鱼谱系独立地进化出比底栖动物谱系更大的卵和更低的繁殖力，这表明平行的适应性生活史进化。相比之下，其他生活在海洋和淡水栖息地（包括非洲湖泊）的远洋硬骨鱼通常会产下大量非常小的卵。我们的研究结果还表明，繁殖力下降和卵大小增加不仅在每个湖泊中独立发生，而且在岩石和远洋栖息地的殖民化中也独立发生。
The existence of ancient deep-water lakes provides an opportunity to study the independent adaptation of aquatic organisms to pelagic, benthic, and rocky shore habitats. With improving resolution of their phylogenetic relationships, the many cichlid fish species endemic to the African Great Lakes Malawi, Tanganyika, and Victoria provide a significant resource for the comparative study of such evolutionary processes. Here, we show that cichlid lineages colonizing rocky shores and pelagic habitats in the different lakes have independently evolved larger eggs and lower fecundities than benthic lineages, suggesting parallel adaptive life-history evolution. By contrast, other pelagic teleost fishes in both marine and freshwater habitats, including African lakes, typically produce large numbers of very small eggs. Our results also suggest that decreased fecundity and increased egg size not only occurred independently in each lake but occurred independently in the colonization of rocky and pelagic habitats.