Conservation Genetics Laboratory, US Fish and Wildlife Service Alaska Region, Anchorage, AK 99503, USA. jeffrey
J Fish Biol. 2010 Apr;76(5):1128-48. doi: 10.1111/j.1095-8649.2010.02554.x.
Adult Chinook salmon Oncorhynchus tshawytscha navigate in river systems using olfactory cues that may be influenced by hydrologic factors such as flow and the number, size and spatial distribution of tributaries. Thus, river hydrology may influence both homing success and the level of straying (gene flow), which in turn influences population structure. In this study, two methods of multivariate analysis were used to examine the extent to which four indicators of hydrology and waterway distance explained population structure of O. tshawytscha in the Yukon River. A partial Mantel test showed that the indicators of hydrology were positively associated with broad-scale (Yukon basin) population structure, when controlling for the influence of waterway distance. Multivariate multiple regression showed that waterway distance, supplemented with the number and flow of major drainage basins, explained more variation in broad-scale population structure than any single indicator. At an intermediate spatial scale, indicators of hydrology did not appear to influence population structure after accounting for waterway distance. These results suggest that habitat changes in the Yukon River, which alter hydrology, may influence the basin-wide pattern of population structure in O. tshawytscha. Further research is warranted on the role of hydrology in concert with waterway distance in influencing population structure in Pacific salmon.
成年奇努克鲑鱼（Oncorhynchus tshawytscha）利用嗅觉线索在河流系统中导航，这些线索可能受到水文因素的影响，例如流量以及支流的数量、大小和空间分布。因此，河流的水文学可能会影响归巢的成功率和游荡（基因流动）的程度，进而影响种群结构。在这项研究中，使用了两种多元分析方法来研究四个水文和航道距离指标在多大程度上解释了育空河奇努克鲑鱼的种群结构。部分 Mantel 检验表明，在控制航道距离影响的情况下，水文学指标与大尺度（育空盆地）种群结构呈正相关。多元多重回归表明，航道距离加上主要流域的数量和流量，比任何单一指标都能更好地解释大尺度种群结构的变化。在中等空间尺度上，在考虑了航道距离之后，水文学指标似乎并没有影响种群结构。这些结果表明，育空河的栖息地变化改变了水文学，可能会影响奇努克鲑鱼的全流域种群结构模式。需要进一步研究水文学与航道距离在影响太平洋鲑鱼种群结构方面的协同作用。
