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Linking local movement and molecular analysis to explore philopatry and population connectivity of the southern stingray Hypanus americanus
Journal of Fish Biology ( IF 2 ) Pub Date : 2020-04-05 , DOI: 10.1111/jfb.14325
Tanja N Schwanck 1, 2 , Maximilian Schweinsberg 1 , Kathrin P Lampert 3 , Tristan L Guttridge 4, 5 , Ralph Tollrian 1 , Owen O'Shea 6, 7
Affiliation  

Limited data are available pertaining to life history and population connectivity of the data deficient southern stingray (Hypanus americanus, Hildebrand & Schroeder, 1928). In order to determine potential vulnerabilities of their populations, this study aimed to analyze 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 very 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 no distinct population structure strictly correlated to 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.

中文翻译:

将局部运动和分子分析联系起来,探索南方黄貂鱼 Hypanus americanus 的亲缘关系和种群连通性

关于数据不足的南方黄貂鱼(Hypanus americanus, Hildebrand & Schroeder, 1928)的生活史和种群连通性的可用数据有限。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。南部黄貂鱼种群包括巴哈马伊柳塞拉角周围的九个地点,已使用标记重新捕获技术进行了监测,时间跨度为 2.5 年。在 200 条单独的黄貂鱼中,超过三分之一再次遇到。雌性的家庭范围似乎非常有限,这支持了高站点居住的概念。由于黄貂鱼的常住种群可能缺乏种群连通性,并且注定要进行基因隔离和局部灭绝,本研究进一步调查了巴哈马中部和西部四个样本点的遗传连通性。来自线粒体 D 环区域的单倍型分析显示没有与样本位点严格相关的明显种群结构。这些发现得到了五个微卫星位点的补充,这些位点揭示了高度的基因型变异性和很少的种群分化。结果表明基因流动由雄性和雌性介导。
更新日期:2020-04-05
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