Abstract
Many hypotheses have been proposed to explain the adaptive significance of aggregative feeding in the Lepidoptera. One hypothesis that has received little attention is how induced plant responses may be influenced by aggregative feeding, as compared to feeding by solitary larvae. This study investigated the role of aggregative feeding of the pipevine swallowtail, Battus philenor, in California with special emphasis on the induced responses to herbivory of its hostplant. Here, I show that first-instar larvae develop faster when feeding in a large aggregation compared to solitary or small groups of larvae. Furthermore, I show that this effect is mediated by a larval-density-dependent response in the plant and is independent of prior larval experience and direct interaction among larvae. These results indicate that large groups of larvae can effectively enhance hostplant suitability. A separate experiment showed that larvae feeding on previously damaged leaves had a reduced growth rate. Thus, following initial damage a plant first goes through a period of increased suitability, followed by induced resistance against subsequent herbivory. Aggregative feeding in this system may be an adaptive strategy for larvae to manipulate hostplant suitability, adding a new dimension to the role of aggregative feeding for the Lepidoptera.
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Acknowledgements
This manuscript was improved by comments from Art Shapiro, Rick Karban, Anurag Agrawal, Chris Nice, Rich Van Buskirk, Kenneth Raffa, William Morris, Carol Boggs, and anonymous reviewers. Thanks to Sharon Strauss for use of her micro-balance. Thanks to Dan Tolson and Shorty Boucher of the University of California Natural Reserve System for facilitating work at Stebbins Cold Canyon Ecological Reserve. This study was supported by a Mildred E. Mathias Graduate Student Research Grant (University of California Natural Reserve System), Public Service Research Program and the Putah-Cache Bioregion Project (UC Davis), Jastro-Shields Awards Program (UC Davis), Center for Population Biology (UC Davis), and Sigma-Xi Grants-in-Aid of Research.
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Fordyce, J.A. Aggregative feeding of pipevine swallowtail larvae enhances hostplant suitability. Oecologia 135, 250–257 (2003). https://doi.org/10.1007/s00442-003-1177-8
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DOI: https://doi.org/10.1007/s00442-003-1177-8