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|Type:||Artigo de periódico|
|Title:||Host-plant Specialization Mediates The Influence Of Plant Abundance On Host Use By Flower Head-feeding Insects.|
|Author:||Nobre, Paola A F|
Bergamini, Leonardo L
Lewinsohn, Thomas M
Jorge, Leonardo R
|Abstract:||Among-population variation in host use is a common phenomenon in herbivorous insects. The simplest and most trivial explanation for such variation in host use is the among-site variation in plant species composition. Another aspect that can influence spatial variation in host use is the relative abundance of each host-plant species compared to all available hosts. Here, we used endophagous insects that develop in flower heads of Asteraceae species as a study system to investigate how plant abundance influences the pattern of host-plant use by herbivorous insects with distinct levels of host-range specialization. Only herbivores recorded on three or more host species were included in this study. In particular, we tested two related hypotheses: 1) plant abundance has a positive effect on the host-plant preference of herbivorous insects, and 2) the relative importance of plant abundance to host-plant preference is greater for herbivorous species that use a wider range of host-plant species. We analyzed 11 herbivore species in 20 remnants of Cerrado in Southeastern Brazil. For 8 out of 11 herbivore species, plant abundance had a positive influence on host use. In contrast to our expectation, both the most specialized and the most generalist herbivores showed a stronger positive effect of plant species abundance in host use. Thus, we found evidence that although the abundance of plant species is a major factor determining the preferential use of host plants, its relative importance is mediated by the host-range specialization of herbivores.|
|Subject:||Compositae, Diet Breadth, Fruit Fly, Host Plant Selection, Information-processing (or Neural-constraints) Hypothesis|
|Citation:||Environmental Entomology. , 2015-Dec.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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