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

拉古纳Chichancanab（尤卡坦，墨西哥）的生殖发育年轻的鲤科鱼类群（Teleostei）包括6个特有种，共发生。除了所描述的物种之外，还发现了不能归因于其中之一的标本。群体中最底层的成员C. beltrani，在形态和生态上与异域分布的姐妹种C.来自沿海泻湖的人工鱼根据mtDNA数据和行为学研究，只有C。玛雅被认为是生殖隔离的。对于其他五个特有物种，尚不清楚它们是否处于物种形成过程的初始阶段，以及是否发生杂交。在三个特有种的行为研究表明，不同程度的生殖隔离可能会达到。本课题通过微卫星分析来研究鸡群不同成员与其姊妹种之间基因流的存在和数量，以及它们之间的系统发育关系。

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.