MALE MATING SUCCESS AND PATERNITY IN THE GRAY SEAL, HALICHOERUS-GRYPUS - A STUDY USING DNA-FINGERPRINTING
MALE MATING SUCCESS AND PATERNITY IN THE GRAY SEAL, HALICHOERUS-GRYPUS - A STUDY USING DNA-FINGERPRINTING
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DOI：
10.1098/rspb.1993.0066
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发表时间：
1993-06-22
影响因子：
4.7
通讯作者：
ANDERSON, SS
中科院分区：
文献类型：
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作者：
AMOS, W;TWISS, S;ANDERSON, SS
灰海豹在偏远的沿海地区成群繁殖。在蜂群内，雄性为接近雌性而展开激烈的竞争。我们比较了在北罗纳岛的繁殖群体中，通过DNA指纹确定的繁殖行为和亲子关系的现场观察。在被分配为父亲的案件中，父亲在母亲的月经期被观察到在母亲身边，尽管在某些情况下这是追溯发现的。然而，根据行为标准判断，在36%的案例中，最有可能的候选男性不是父亲。总体而言，DNA型雄性比非DNA型雄性更具统治力，在雌性中保持地位的时间更长，而且比非DNA型雄性占不成比例的更多的父爱。然而，类型雄性的生殖成功并不像他们在行为上控制交配机会所显示的那样伟大。可能的促成因素包括：(I)由于雄性的流动性或地形对个体行为的影响，对交配机会的估计不准确；以及(Ii)从属雄性与接受的雌性交配的机会，无论是在群体内还是在水中。
Grey seals breed colonially on remote coastal sites. Within the colony, males compete aggressively for access to the females. We compare field observations of breeding behaviour with paternity, as determined by DNA fingerprinting, in the breeding colony on the island of North Rona. In 89% of cases where paternity was assigned, the father was observed near the mother during her perioestrous period, although in some cases this was discovered retrospectively. However, the most likely candidate male, judged on the basis of behavioural criteria, was shown not to be the father in 36% of cases. Overall, DNA typed males were more dominant, maintained positions amongst the females for longer, and accounted for disproportionately more paternities than untyped males. However, the reproductive success of the typed males is not as great as their behavioural domination of copulatory opportunities would suggest. Possible contributory factors which could explain this include: (i) imprecision in the estimates of copulatory opportunity due to mobility of males or topographical influences on individual behaviour; and (ii) opportunities for subordinate males to copulate with receptive females, either sneakily within the colony or in the water.