Hauser Samantha S, Walker Lauren, Leberg Paul L
Department of Biology University of Louisiana at Lafayette Lafayette Louisiana.
Present address: Department of Biological Sciences University of Wisconsin - Milwaukee Milwaukee Wisconsin.
Ecol Evol. 2018 Dec 10;9(1):463-470. doi: 10.1002/ece3.4764. eCollection 2019 Jan.
Habitat fragmentation can produce metapopulations or source-sink systems in which dispersal in crucial for population maintenance. Our objective was to investigate connectivity among black-capped vireo () populations in tandem with a demographic study (Biological Conservation, 2016, 203, 108-118) to elucidate if central Texas populations act as a source-sink system. We genotyped 343 individuals at 12 microsatellite loci to elucidate the movement ecology of the black-capped vireo in central Texas surrounding Fort Hood; the largest and most stable breeding population of black-capped vireos inhabit Fort Hood. To gain insight into gene flow among populations, we analyzed genetic differentiation, migration rates, number of migrants, and parentage. We found statistically significant, but low levels of genetic differentiation among several populations, suggesting some limited restriction to gene flow. Across approaches to estimate migration, we found consistent evidence for asymmetrical movement from Fort Hood to the other central Texas sites consistent with source-sink dynamics. Our results are complementary to black-capped vireo demographic studies done in tandem showing that portions of Fort Hood are acting as a source population to smaller central Texas populations.
栖息地破碎化会产生集合种群或源-汇系统，在这些系统中，扩散对于种群维持至关重要。我们的目标是结合一项种群统计学研究（《生物保护》，2016年，第203卷，第108 - 118页），调查黑顶绿鹃（）种群之间的连通性，以阐明德克萨斯州中部的种群是否构成一个源-汇系统。我们对343个个体的12个微卫星位点进行了基因分型，以阐明黑顶绿鹃在胡德堡周边德克萨斯州中部地区的移动生态；黑顶绿鹃最大且最稳定的繁殖种群栖息在胡德堡。为了深入了解种群间的基因流动，我们分析了遗传分化、迁移率、迁移个体数量和亲子关系。我们发现几个种群之间存在统计学上显著但程度较低的遗传分化，这表明基因流动存在一定限制。在各种估计迁移的方法中，我们发现一致的证据表明从胡德堡到德克萨斯州中部其他地点的不对称移动，这与源-汇动态一致。我们的结果与同时进行的黑顶绿鹃种群统计学研究相辅相成，表明胡德堡的部分区域正作为德克萨斯州中部较小种群的源种群。
