Willow hybridization differentially affects preference and performance of herbivorous beetles

Autor: Pamela Zee, Robert S. Fritz, Minh Tam T. Dao, Colin M. Orians, Alexander L. Wild, Katherine A. Dorfman, Cynthia H. Huang
Rok vydání: 1997
Předmět:
Zdroj: Entomologia Experimentalis et Applicata. 83:285-294
ISSN: 1570-7458
0013-8703
DOI: 10.1046/j.1570-7458.1997.00183.x
Popis: We examined the preferences and performances of five beetle species (four chrysomelids and one scarab) on two species of willows (Salix sericea and S. eriocephala) and their interspecific hybrids. Beetle species differed markedly in their responses. In preference assays, two chrysomelid beetle species (Calligrapha multipunctata bigsbyana and Plagiodera versicolora) preferred hybrids, two chrysomelids (Chrysomela scriptaand Ch. Knabi) preferred hybrids and S. sericea, and the scarab beetle (Popillia japonica) preferred S. eriocephala. Experiments with purified salicortin indicated that salicortin concentration may contribute to these preferences. The relative performance (growth rate, pupal/adult weight and survivorship) of these beetles on the three willow taxa did not correspond with their feeding preferences. Three species exhibited intermediate performance on hybrid willows (the two Chrysomelaspp. and P. japonica); the Chrysomelaspp. performed best on S. sericea, while P. japonicaperformed best on S. eriocephala. One species performed equally well on all three taxa (C. multipunctata bigsbyana). The performance of Pl. versicolora was not tested. Our results support the general pattern that willow taxa with phenolic glycosides are more acceptable to specialist willow herbivores while those taxa without phenolic glycosides are more acceptable to generalist herbivores. We also show that to predict the relative susceptibility of hybrid and parental plants to herbivores, consideration must be given to the inheritance of traits affecting both preference and performance.
Databáze: OpenAIRE
Externí odkaz: