Molecular genetic analysis of the speciation process of the Cyprinodon species flock (Teleostei) from Laguna Chichancanab, Mexico

墨西哥尤卡坦拉古纳Chichancanab的系统发育年轻的鲤鱼群(Telebone)由6个共生的特有种组成。此外，还发现了所描述的物种标本，但不能归因于其中之一。群中最基本的成员是C.beltri，在形态和生态上与来自沿海泻湖的异地姐妹种C.artifron相似。根据线粒体DNA数据和行为研究，只有物种C.Maya被认为是生殖性隔离的。对于其他五种特有物种，尚不清楚它们是否处于物种形成过程的初始阶段，以及是否发生了杂交。对三个特有物种的行为研究表明，可能会达到不同程度的生殖隔离。在这一项目中，应进行微卫星分析，以检查群体的不同成员与其姊妹种之间的基因流的存在和数量以及它们的系统发育关系。

The phylogenetically young Cyprinodon species flock (Teleostei) of Laguna Chichancanab (Yucatan, Mexico) consists of six endemic species which occur syntopically. Besides the species described specimens are found which cannot be attributed to one of them. The most basal member of the flock, C. beltrani, is morphologically and ecologically similar to the allopatric sister species C. artifrons from coastal lagoons. Based on mtDNA data and behavioral studies only the species C. maya is assumed to be reproductively isolated. For the other five endemic species it is unclear whether they are in the initial phase of the speciation process and if hybridization occurs. Behavioral studies in three of the endemic species indicate that different levels of reproductive isolation might be reached. In this poject a microsatellite analysis shall be performed to examine the existence and the amount of geneflow between the different members of the flock and their sister species as well as their phylogenetic relationship.