Carlsson J, Nilsson J
Department of Aquaculture, Swedish University of Agricultural Sciences, Umeå, Sweden.
Hereditas. 2000;132(3):173-81. doi: 10.1111/j.1601-5223.2000.00173.x.
Brown trout (Salmo trutta L.) population genetic structure and its temporal stability were studied within a small forest stream in central Sweden using five microsatellite loci. Both resident and migrating brown trout are present in the watershed. Tissue samples were collected from seven sections of the stream during two consecutive years. No differences were found in multilocus FST estimates between years within sections except in one case. Moreover, differences between age cohorts within sample sections were rare. The low interannual variation and the low heterogeny between cohorts is interpreted as indications of temporal stability. Pairwise multilocus FST estimates increased with increasing geographic distance, indicating isolation by distance. It is argued that the brown trout of the Färsån stream represent a population complex. The structure is probably maintained by precise natal homing and a limited, but important, amount of gene flow between closely situated sections within the stream supporting a stepping-stone model of gene flow.
利用五个微卫星位点，对瑞典中部一条小森林溪流中的褐鳟（Salmo trutta L.）种群遗传结构及其时间稳定性进行了研究。该流域既有定居的褐鳟，也有洄游的褐鳟。在连续两年中，从溪流的七个断面采集了组织样本。除了一个断面外，各断面内不同年份的多位点FST估计值没有差异。此外，样本断面内不同年龄组之间的差异很少见。年际变化低和组间异质性低被解释为时间稳定性的指标。成对多位点FST估计值随着地理距离的增加而增加，表明存在距离隔离。有人认为，法尔桑溪的褐鳟代表一个种群复合体。这种结构可能是通过精确的出生地归巢以及溪流中相邻断面之间有限但重要的基因流来维持的，这支持了基因流的 stepping-stone 模型。
