期刊
ECOLOGICAL ENTOMOLOGY
卷 35, 期 1, 页码 61-68出版社
WILEY-BLACKWELL PUBLISHING, INC
DOI: 10.1111/j.1365-2311.2009.01156.x
关键词
Aggregation; alternative food resources; Anisodactylus ovularis; apparent competition; biological control; black cutworms (Agrotis ipsilon); Carabidae; herbivore suppression; intraguild predation; numerical response; omnivory; Poecilus chalcites; predator aggregation
类别
资金
- Maryland Agricultural Experiment Station
2. In two species of carabid larvae (Poecilus chalcites and Anisodactylus ovularis), we studied how alternative foods (fly pupae and grass seeds) and predator density affect predation of black cutworm larvae and how alternative foods affect cannibalism among carabid larvae. 3. Adding alternative food to microcosms generally reduced total predation of cutworms. However, the strength of this effect was dependent on carabid species, larval density, and food type. 4. Increasing larval density from one to three per microcosm reduced per-capita predation by both species irrespective of alternative food treatment. 5. Alternative food reduced cannibalism in both carabid species and increased survival of carabid larvae in field plots, such that twice as many were captured in plots subsidised with pupae than plots with no alternative food. 6. These results provide new insight into the complex interactions that influence predator survival and herbivore suppression in resource diverse habitats by demonstrating the primacy of intraguild interactions among carabid larvae.
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