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Mother really knows best: host choice of adult phytophagous insect females reflects a within-host variation in suitability as larval food 总被引:1,自引:0,他引:1
Anders Wennström Lena Niemi Hjulström Joakim Hjältén Riitta Julkunen-Tiitto 《Chemoecology》2010,20(1):35-42
Non-random distribution patterns of specialized phytophagous insects on their hosts may depend on intraspecific differences
in plant tissue quality, including nutrients and secondary compounds. Secondary compounds are involved in plant resistance,
but are also important for the recognition and acceptability of plants as resources by specialized insects. If individuals
within a plant species vary in their content of such secondary substances, there may also be qualitative differences between
them. In such cases, natural selection will favor insects with the ability to distinguish and prefer the more suitable plants.
In Sweden, the leaf beetle Gonioctena linnaeana Schrank (Coleoptera, Chrysomelidae) is highly specialized on one host, the native willow Salix triandra L (Salicaceae). Field observations reveal that some host plants in a population harbor many feeding larvae, causing severe
defoliation, whereas neighboring plants may have few or no feeding larvae. Our hypothesis is that the distribution pattern
of G. linnaeana larvae in this population results from qualitative differences between individual host plants in combination with the ability
of G. linnaeana females to distinguish between plants that are suitable and not suitable for offspring performance. We examine whether larval
survival differs depending on diet and whether the content of secondary chemical compounds explains female preference. Based
on the higher survival rate of larvae reared on leaves from preferred hosts, we conclude that G. linnaeana females have evolved a behavior that maximizes offspring performance and thus positively affects female fitness. A chemical
survey of the plants indicates that luteolin-7-glucoside and an unidentified flavonoid are important for separating the preferred
from the non-preferred plants. 相似文献