Sympatric speciation in Nicaraguan crater lake cichlid fish
Sympatric speciation in Nicaraguan crater lake cichlid fish
复制标题
DOI：
10.1038/nature04325
复制
发表时间：
2006-02-09
期刊：
影响因子：
64.8
通讯作者：
Meyer, A
中科院分区：
文献类型：
--
作者：
Barluenga, M;Stölting, KN;Meyer, A
同域物种形成，即物种在没有地理障碍的情况下形成，是进化生物学中最具争议的概念之一。虽然在同域条件下的物种形成在理论上似乎是可能的（1-5），但经验研究很少，只有少数可信的同域物种形成的例子存在(6)。在这里，我们提出了一个令人信服的同域物种形成的例子，在尼加拉瓜一个年轻的小火山口湖的Midas稚鱼物种群（Amphilophus sp.）。我们的研究包括系统地理学、群体遗传学（基于线粒体DNA、微卫星和扩增片段长度多态性）、形态计量学和生态学分析。我们发现，首先，阿波约火山口湖只出现过一次高体底栖物种黄壶壶（Amphilophus citrinellus）的祖先，这是该地区最常见的慈鲷物种；第二，一个新的细长的沼泽物种（Amphilophus zaliosus）在不到1万年的时间里从阿波约湖的祖先物种（a . citrinellus）进化而来；第三，阿泊约湖的两个物种是生殖隔离的；第四，这两个物种在生态形态上是不同的。
Sympatric speciation, the formation of species in the absence of geographical barriers, remains one of the most contentious concepts in evolutionary biology. Although speciation under sympatric conditions seems theoretically possible(1-5), empirical studies are scarce and only a few credible examples of sympatric speciation exist(6). Here we present a convincing case of sympatric speciation in the Midas cichlid species complex (Amphilophus sp.) in a young and small volcanic crater lake in Nicaragua. Our study includes phylogeographic, population-genetic ( based on mitochondrial DNA, microsatellites and amplified fragment length polymorphisms), morphometric and ecological analyses. We find, first, that crater Lake Apoyo was seeded only once by the ancestral high-bodied benthic species Amphilophus citrinellus, the most common cichlid species in the area; second, that a new elongated limnetic species ( Amphilophus zaliosus) evolved in Lake Apoyo from the ancestral species ( A. citrinellus) within less than similar to 10,000 yr; third, that the two species in Lake Apoyo are reproductively isolated; and fourth, that the two species are eco-morphologically distinct.