Genetic diversity, admixture, and hatchery influence in Brook Trout (Salvelinus fontinalis) throughout western New York State

Although Brook Trout are distributed across most of eastern North America, population numbers have declined in many regions due to habitat loss, climate change, and competition with non-native species. In New York State, Brook Trout habitat has been substantially reduced, with many areas showing complete extirpation of Brook Trout populations, predominantly in the western portion of the state. Small, fragmented populations are at risk of genetic diversity loss, inbreeding depression, and reduced fitness, leading to a greater potential for local extirpation. Genetic monitoring is a practical tool that can facilitate further conservation-decision making regarding small populations. In this study, we used 12 microsatellite loci to examine 3,436 sampled Brook Trout, representing 75 sites from the Allegheny, Erie/Niagara, Genesee, Oswego, Lake Ontario, and Susquehanna drainage basins throughout western New York State. Three Brook Trout hatchery strains were also genetically characterized to ...

尽管溪红点鲑（Brook Trout）的自然分布范围覆盖北美东部大部分区域，但受栖息地丧失、气候变化与外来物种竞争等多重因素影响，多数区域的种群数量已出现显著下滑。在纽约州，溪红点鲑的栖息生境已大幅缩减，诸多区域的溪红点鲑种群已彻底消失，此类种群灭绝现象主要集中在该州西部地区。小型且碎片化的种群面临遗传多样性丧失、近交衰退以及适合度下降的风险，进而增大了其局部灭绝的潜在可能性。遗传监测是一项实用的研究手段，可助力小型种群相关保护决策的制定与推进。本研究采用12个微卫星位点（microsatellite loci），对采自纽约州西部阿勒格尼、伊利/尼亚加拉、杰纳西、奥斯韦戈、安大略湖及萨斯奎哈纳六大流域的75个采样点的3436尾溪红点鲑样本进行了遗传分析。此外，本研究还对3个溪红点鲑养殖品系开展了遗传特征鉴定……