Microsatellite DNA analyses support an east-west phylogeographic split of American alligator populations
Microsatellite DNA analyses support an east-west phylogeographic split of American alligator populations
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DOI：
10.1002/jez.10189
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发表时间：
2002-12-15
影响因子：
--
通讯作者：
Sawyer, RH
中科院分区：
文献类型：
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作者：
Davis, LM;Glenn, TC;Sawyer, RH
我们研究了美国东南部12个地区的美洲短吻鳄（短吻鳄）的种群遗传结构。本研究的主要目的是利用8个微卫星位点确定佛罗里达州4个湖泊短吻鳄的种群分化程度，并将结果与位于不同距离的其他地点进行比较。种群结构分析显示，位于佛罗里达州中北部圣约翰河流域的Apopka、Griffin、Orange和Woodruff 4个湖之间分化不大（F-ST=0.039, Rho=0.012）。此外，这些样本与Everglades国家公园（F-ST=0.044, Rho=0.009）和南乔治亚州（F-ST=0.045, Rho=0.032）的样本差异不大。因此，这6个样本被合并为“FL/sGA组”。同样，在该范围的西部，德克萨斯州的阿纳瓦克国家野生动物保护区和萨尔瓦多野生动物管理区，路易斯安那州的马什岛野生动物保护区和洛克菲勒野生动物保护区采集的样本也缺乏种群结构（F-ST=0.024, R-ST=0.040）。这四个群体被归为“TX/LA组”。将这两组样本与来自南卡罗来纳州Santee海岸保护区和阿拉巴马州莫比尔的样本进行比较，发现各组之间的分化程度高出三到四倍（F-ST=0.131; Rho=0.187）。这些和其他分析支持了美洲短吻鳄种群东西向系统地理分化的假设，并且与分布在同一地理区域的许多淡水鱼、水生和陆生海龟的研究相一致。(C) 2002 Wiley-Liss, Inc。
We examined the population genetic structure of American alligators (Alligator mississippiensis) sampled from 12 localities across the southeastern United States. The primary goal of this study was to determine the extent of population differentiation among alligators from four Florida lakes using eight microsatellite loci and compare the results to additional sites located at varying distances from them. Analyses of population structure revealed little differentiation (F-ST=0.039; Rho=0.012) among the four Florida lakes, Apopka, Griffin, Orange and Woodruff, which are all located in the St. John's River watershed in north-central Florida. Further, there was little differentiation among these samples and samples collected from the Everglades National Park (F-ST=0.044; Rho=0.009) and south Georgia (F-ST=0.045; Rho=0.032). Therefore, these six samples were pooled together as a "FL/sGA group." Similarly, samples collected in the western extent of the range, Anahuac National Wildlife Refuge in Texas and Salvador Wildlife Management Area, Marsh Island Wildlife Refuge and Rockefeller Wildlife Refuge in Louisiana, also lacked population structure (F-ST=0.024; R-ST=0.040). These four populations were pooled into the "TX/LA group." Comparisons of these two groups with samples taken from the Santee Coastal Reserve in South Carolina and Mobile, Alabama yielded three to four times more differentiation among groups (F-ST=0.131; Rho=0.187). These and other analyses support the hypothesis of an east-west phylogeographic split in American alligator populations and are consistent with studies of many freshwater fish and aquatic and terrestrial turtles distributed throughout this same geographic region. (C) 2002 Wiley-Liss, Inc.