SIZE, DOMINANCE AND COPULATORY SUCCESS IN MALE NORTHERN ELEPHANT SEALS, MIROUNGA-ANGUSTIROSTRIS
SIZE, DOMINANCE AND COPULATORY SUCCESS IN MALE NORTHERN ELEPHANT SEALS, MIROUNGA-ANGUSTIROSTRIS
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DOI：
10.1006/anbe.1994.1361
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发表时间：
1994-12-01
期刊：
影响因子：
2.5
通讯作者：
LEBOEUF, BJ
中科院分区：
文献类型：
--
作者：
HALEY, MP;DEUTSCH, CJ;LEBOEUF, BJ
对雄性北方象海豹的体型、优势度和交配成功率之间的关系进行了研究，以确定体型在雄性性内竞争中的重要性。这项研究在加州中部的阿诺努埃沃繁殖场进行了四个繁殖季节。质量估计使用摄影测量技术在三个季节和直接测量在一个。交配成功与大小（质量和长度）呈正相关。这种相关性是通过大小对优势等级的积极影响来介导的;例如，到达质量的变化占优势变化的29-44%。交配成功率呈正相关，与统治地位的排名中，高级别的男性，但不是低级别的男性，获得很少的交配。交配成功与大小没有显着相关性时，显性的影响被删除统计。这些结果支持这一假设，即男性生殖成功，在这个物种主要是由优势地位，这反过来又是由男性的大小影响。然而，他们也表明，大尺寸只是影响雄性性内竞争结果的许多重要因素之一，因此，生殖成功。
The relationship between size, dominance and copulatory success was investigated in male northern elephant seals to determine the importance of size in male intra-sexual competition for mates. The study was conducted over four breeding seasons at the Ano Nuevo rookery in central California. Mass was estimated using a photogrammetrical technique in three seasons and measured directly in one. Copulatory success was positively correlated with size (mass and length). This correlation was mediated through the positive effect of size on dominance rank; variation in arrival mass, for example, accounted for 29-44% of the variation in dominance. Copulatory success was positively correlated with dominance rank for mid- to high-ranking males, but not for low-ranking males, which obtained few copulations. Copulatory success was not significantly correlated with size when the effect of dominance was removed statistically. These results support the hypothesis that male reproductive success in this species is principally determined by dominance rank, which, in turn, is affected by male size. However, they also suggest that large size is just one of a number of important factors that affect the outcome of male intra-sexual competition and hence, reproductive success.