SEXUAL SELECTIONS EFFECTS ON MALE LIFE-HISTORY AND THE PATTERN OF MALE MORTALITY

被引:68
作者
CLINTON, WL [1 ]
LEBOEUF, BJ [1 ]
机构
[1] UNIV CALIF SANTA CRUZ, DEPT BIOL, SANTA CRUZ, CA 95064 USA
关键词
COST OF REPRODUCTION; DEMOGRAPHY; FUTURE SURVIVAL VS MATING SUCCESS; LIFE HISTORY; MALE LIFE TABLE; MALE MORTALITY; PINNIPEDS; MIROUNGA-ANGUSTIROSTRIS; NORTHERN ELEPHANT SEAL; SEX DIFFERENCES;
D O I
10.2307/1939945
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Modifications of male life history due to sexual selection should be apparent in polygynous species such as elephant seals, in which sexual selection has produced a high degree of sexual dimorphism. In theory, male traits that confer a mating advantage bear survival disadvantages. The aim of this study was to examine the relationship between sexual selection and life history patterns in male northern elephant seals, Mirounga angustirostris. A life table, with age-specific estimates of mortality and reproduction, was constructed for male elephant seals from resighting data of tagged seals. Increased age-specific mortality was associated with the period of first reproduction by males, which occurred from 6-10 yr of age. A negative relationship was found between mating success and future survival in males that were beginning to breed. Older males showed no phenotypic costs to reproduction, and a positive, but not significant, relationship was shown between current mating success and future survival and mating success.
引用
收藏
页码:1884 / 1892
页数:9
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