Department of Biology, Dalhousie University, Halifax, Nova Scotia, B3H 4J1 Canada.
J Fish Biol. 2010 Aug;77(3):479-93. doi: 10.1111/j.1095-8649.2010.02690.x.
The incidence and magnitude of multiple paternity were estimated for a natural, unmanipulated spawning population of Atlantic salmon Salmo salar. Egg nests were surveyed in the autumn and sub-samples were excavated the following spring. Parentage data derived from microsatellite DNA revealed an unexpectedly high level of multiple paternity. Within a single redd, females may mate with as many as 16 different males, including small mature male parr and large anadromous males. Multiple paternity was most pronounced in areas of highest redd density, corresponding with increased abundances of mature male parr. In addition, there was considerable variation in success among males, although this variability did not depend upon the number of males participating in spawning. This work underscores the value of undertaking genetic studies on the mating systems of fishes in unmanipulated, natural environments.
本研究对自然状态下未经人为干预的大西洋三文鱼产卵群体的多父本现象的发生率和程度进行了评估。研究人员在秋季调查了鱼巢，并在次年春季对其进行了抽样挖掘。微卫星 DNA 亲子关系分析结果显示，多父本现象的发生率高得惊人。在单个产卵床中，雌性三文鱼可能会与多达 16 个不同的雄性个体交配，其中包括小型成熟雄幼鱼和大型溯河洄游雄鱼。在产卵床密度最高的区域，多父本现象最为明显，与成熟雄幼鱼的丰度增加相对应。此外，雄性个体之间的成功繁殖差异较大，但这种变异性并不取决于参与繁殖的雄性数量。这项研究强调了在未经人为干预的自然环境中对鱼类交配系统进行遗传研究的重要价值。
