Department of Animal Ecology, Evolution and Biodiversity, Ruhr University Bochum, 44801 Bochum, Germany.
School of Biological Sciences, University of Aberdeen, AB24 2TZ Aberdeen, United Kingdom.
J Fish Biol. 2020 Jun;96(6):1475-1488. doi: 10.1111/jfb.14325. Epub 2020 Apr 5.
Limited data pertaining to life history and population connectivity of the data-deficient southern stingray (Hypanus americanus) are available. To determine potential vulnerabilities of their populations, this study aimed to analyse their movement patterns and genetic variability. A population of southern stingrays encompassing nine sites around Cape Eleuthera, the Bahamas, has been monitored using mark-recapture, spanning a 2.5 year period. Out of 200 individual stingrays, more than a third were encountered again. The home range of the females appears to be restricted, which supports the notion of high site residency. As resident populations of stingrays could suffer from a lack of population connectivity and be predestined for genetic isolation and local extirpation, this study further investigated the genetic connectivity of four sample sites in the central and western Bahamas. A haplotype analysis from the mitochondrial D-loop region showed that no distinct population structure strictly correlated with the sample site. These findings were complemented by five microsatellite loci that revealed high degrees in genotypic variability and little population differentiation. The results suggest gene flow mediated by both males and females.
有关数据缺乏的南方黄貂鱼（Hypanus americanus）的生活史和种群连通性的数据有限。为了确定其种群的潜在脆弱性，本研究旨在分析它们的运动模式和遗传变异性。在巴哈马的埃利奥特角周围的九个地点监测了一个南方黄貂鱼种群，跨度为 2.5 年。在 200 条个体黄貂鱼中，超过三分之一再次被发现。雌性的家域似乎受到限制，这支持了高栖息地居留的观点。由于黄貂鱼的居留种群可能缺乏种群连通性，并注定要遭受遗传隔离和局部灭绝，因此本研究进一步调查了巴哈马中部和西部四个采样点的遗传连通性。来自线粒体 D 环区域的单倍型分析表明，没有与采样点严格相关的明显种群结构。这一发现得到了五个微卫星基因座的补充，这些基因座显示出高度的基因型变异性和很少的种群分化。结果表明，雌雄两性都通过基因流进行介导。
