SEXUAL DIMORPHISM IN SIZE, RELATIVE SIZE OF TESTES, AND MATING SYSTEMS IN NORTH-AMERICAN VOLES

被引:144
作者
HESKE, EJ [1 ]
OSTFELD, RS [1 ]
机构
[1] BOSTON UNIV, DEPT BIOL, BOSTON, MA 02215 USA
关键词
D O I
10.2307/1381789
中图分类号
Q95 [动物学];
学科分类号
071002 ;
摘要
Sexual body-length dimorphism and relative size of testes were compared among 16 species (25 subspecies) of North American Microtus and Clethrionomys. Species with polygynous mating systems and territorial males had the greatest degree of sexual size dimorphism with males larger than females, and relatively small testes. Promiscuous species tended to show little or no sexual size dimorphism and relatively large testes. Species considered monogamous had no size dimorphism, and also had large testes. Data support the hypothesis that sexual dimorphism in size is correlated with the intensity of intrasexual competition for mates, but the hypothesis that species with single-male breeding systems (single-male polygyny and monogamy) have relatively smaller testes than species with mating systems characterized by a high potential for sperm competition (promiscuity) was supported only for polygynous species. -Authors
引用
收藏
页码:510 / 519
页数:10
相关论文
共 68 条
[11]  
Crook J. H., 1972, SEXUAL SELECTION DES, P231
[12]  
Darwin C., 1871, P423
[13]  
Dewsbury D.A., 1984, P547
[14]   STUDIES OF SPERM COMPETITION IN 2 SPECIES OF MUROID RODENTS [J].
DEWSBURY, DA ;
BAUMGARDNER, DJ .
BEHAVIORAL ECOLOGY AND SOCIOBIOLOGY, 1981, 9 (02) :121-133
[15]   SEXUAL DIMORPHISM FOR BODY-MASS IN 13 TAXA OF MUROID RODENTS UNDER LABORATORY CONDITIONS [J].
DEWSBURY, DA ;
BAUMGARDNER, DJ ;
EVANS, RL ;
WEBSTER, DG .
JOURNAL OF MAMMALOGY, 1980, 61 (01) :146-149
[16]   DARWINS FINCHES AND EVOLUTION OF SEXUAL DIMORPHISM IN BODY SIZE [J].
DOWNHOWER, JF .
NATURE, 1976, 263 (5578) :558-563
[17]  
FITCH HENRY S., 1957, UNIV KANSAS PUBL MUS NAT HIST, V10, P129
[18]   SOCIAL-ORGANIZATION OF A FREE-RANGING POPULATION OF PINE VOLES, MICROTUS-PINETORUM [J].
FITZGERALD, RW ;
MADISON, DM .
BEHAVIORAL ECOLOGY AND SOCIOBIOLOGY, 1983, 13 (03) :183-187
[19]  
GETZ L L, 1980, Biologist (Charleston), V62, P56
[20]  
GETZ LL, 1987, AM ZOOL, V27, P909