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Annual Review of Ecology, Evolution, and Systematics

Volume 51, 2020

What We Don't Know About Diet-Breadth Evolution in Herbivorous Insects

Abstract

Half a million species of herbivorous insects have been described. Most of them are diet specialists, using only a few plant species as hosts. Biologists suspect that their specificity is key to their diversity. But why do herbivorous insects tend to be diet specialists? In this review, we catalog a broad range of explanations. We review the evidence for each and suggest lines of research to obtain the evidence we lack. We then draw attention to a second major question, namely how changes in diet breadth affect the rest of a species’ biology. In particular, we know little about how changes in diet breadth feed back on genetic architecture, the population genetic environment, and other aspects of a species’ ecology. Knowing more about how generalists and specialists differ should go a long way toward sorting out potential explanations of specificity, and yield a deeper understanding of herbivorous insect diversity.

Keyword(s): ecological specialization, feedbacks, insect–plant interactions, phytophagy, trade-offs
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2020-11-02
2025-06-20
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What We Don't Know About Diet-Breadth Evolution in Herbivorous Insects
Annual Review of Ecology, Evolution, and Systematics 51, 103 (2020); https://doi.org/10.1146/annurev-ecolsys-011720-023322
/content/journals/10.1146/annurev-ecolsys-011720-023322
/content/journals/10.1146/annurev-ecolsys-011720-023322
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