Document Detail

Interspecific Differences in Feeding Behavior and Survival Under Food-Limited Conditions for Larval Aedes albopictus and Aedes aegypti (Diptera: Culicidae).
MedLine Citation:
PMID:  23197877     Owner:  NLM     Status:  Publisher    
Aedes albopictus has replaced Aedes aegypti in much of the latter species' historic range within the United States. The leading hypothesis for this displacement is exclusion via resource competition; however, the proximate mechanism producing a competitive advantage for A. albopictus over A. aegypti has not been identified. We performed laboratory experiments to test the hypotheses that these species differ in feeding behavior, and that these differences result in differences in survival when resources are scarce. Differences in feeding behavior were assessed in three environments with food (growing microorganisms) available: 1) in fluid only; 2) on leaf surfaces only; 3) or both in fluid and on leaf surfaces. We determined behavior of larvae in these environments, recording their positions (bottom, wall, leaf, top, or middle) and activities (browsing, filtering, resting, or thrashing) using instantaneous scan censuses. A. albopictus spent significantly more time at leaf surfaces, whereas A. aegypti spent more time engaging in nonfeeding activities. Both species showed a significant shift in foraging activity toward leaves when leaves were available. In a second experiment, we recorded survivorship for individuals raised in two treatment combinations: whole or half 17-mm disks of live oak leaves, with or without direct access to the leaf surface (controlled using nylon mesh, which allowed movement of microscopic organisms, but prevented mosquito larva movement between container sides). After 31 d, survivorship of A. albopictus was significantly greater than that of A. aegypti regardless of treatments. Moreover, A. albopictus showed significantly greater survivorship compared with A. aegypti when deprived of access to leaf surfaces and in whole leaf disk treatments, suggesting superior resource-harvesting ability for A. albopictus. Our experiments suggest that differences in foraging behavior contribute to the competitive advantage of A. albopictus over A. aegypti that has been observed in North America.
Donald A Yee; Banugopan Kesavaraju; Steven A Juliano
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Publication Detail:
Journal Detail:
Title:  Annals of the Entomological Society of America     Volume:  97     ISSN:  0013-8746     ISO Abbreviation:  Ann. Entomol. Soc. Am.     Publication Date:  2004 Jul 
Date Detail:
Created Date:  2012-11-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503290     Medline TA:  Ann Entomol Soc Am     Country:  -    
Other Details:
Languages:  ENG     Pagination:  720-728     Citation Subset:  -    
Department of Biological Sciences, Illinois State University, Normal, IL 61790-4120.
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