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### 草原田鼠和草甸田鼠波动种群雌鼠的攻击性

Joyce E.Hofmann 　Lowell L.Getz

• 出版日期:2005-07-14 发布日期:2008-07-07

### Levels of Female Aggressiveness in Fluctuating Populations of Microtus ochrogaster and M. pennsylvanicus

Joyce E. Hofmann Lowell L. Getz

• Online:2005-07-14 Published:2008-07-07

Abstract: Levels of aggressiveness of females from free-living populations of Microtus ochrogaster and M. pennsylvanicus were compared during phases of the population cycle. M. ochrogaster displayed no significant difference in the proportion of aggressive females or in the means of five behavioral variables (approaches , threats , attacks , retreats , attacks/ approaches) among phases of the population cycle. None of these variables showed a significant linear regression against population density. Neither did the proportions of aggressive M. pennsylvanicus females differ among phases. The mean number of threats in this species was significantly higher during the low than the increase and decline phases and the mean number of attacks was significantly higher during the low than all other phases.The results of this study are similar to those obtained for males and do not support the polymorphic behavior hypothesis regarding generation of population cycles in arvicoline rodents.