期刊
MARINE AND FRESHWATER BEHAVIOUR AND PHYSIOLOGY
卷 38, 期 4, 页码 237-248出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/10236240500376477
关键词
aggression; crayfish; crustacean behavior; prior residence; Procambarus clarkii; shelter competition; shelter fidelity
The shelter defense dynamics of reproductively active (Form I) male red swamp crayfish Procambarus clarkii (Girard) were investigated by staging serial intrusions by male, maternal or non-maternal female conspecifics after one day of residence. The male residents showed a direct contest advantage only against non-maternal females, and won a significantly higher proportion of the encounters against non-maternal females than against either male or maternal female intruders. However, there was no significant difference in success against male or maternal female intruders. Further experiments against male intruders showed that increasing male prior residence to either 2 or 4 days did not significantly improve the residents proportion of successful encounters. A final experiment revealed extremely low shelter fidelity in male P. clarkii , the most likely reason why male shelter defense against conspecific males and maternal females is not successful. These results, combined with those of past research, suggest that non-maternal females, juveniles and recently molted conspecifics are most vulnerable to predation and cannibalism, since males and maternal females easily out-compete non-maternal females for shelter, and adults out-compete juveniles. These findings may have implications for P. clarkii aquaculture and general management.
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