期刊
JOURNAL OF EVOLUTIONARY BIOLOGY
卷 25, 期 1, 页码 38-53出版社
WILEY
DOI: 10.1111/j.1420-9101.2011.02401.x
关键词
Cephaloleia spp; Costa Rica; diet expansions; exotic hosts; genetic correlations; tropical rain forest; Zingiberales
资金
- University of Miami
- OTS (Organization for Tropical Studies)
- Donald and Beverly Stone Fellowship
- Christiane and Christopher Tyson Fellowship
One explanation for the widespread host specialization of insect herbivores is the Jack of all trades-master of none principle, which states that genotypes with high performance on one host will perform poorly on other hosts. This principle predicts that cross-host correlation in performance of genotypes will be negative. In this study, we experimentally explored cross-host correlations and performance among families in four species (two generalist and two specialist) of leaf beetles (Cephaloleia spp.) that are currently expanding their diets from native to exotic plants. All four species displayed similar responses in body size, developmental rates and mortality rates to experimentally controlled diets. When raised on novel hosts, body size of larvae, pupae and adults were reduced. Development times were longer, and larval mortality was higher on novel hosts. Genotype x hostplant interactions were not detected for most traits. All significant cross-host correlations were positive. These results indicate very different ecological and evolutionary dynamics than those predicted by the Jack of all trades-master of none principle.
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