Insights into the evolution of herbivory from a leaf-mining, drosophilid fly
Aguilar, J. M.; Gloss, A. D.; Suzuki, H. C.; Verster, K. I.; Singhal, M.; Hoff, J.; Grebenok, R.; Nabity, P. D.; Behmer, S. T.; Whiteman, N. K.
Show abstract
Herbivorous insects and their host plants comprise most known species on Earth. Illuminating how herbivory repeatedly evolved in insects from non-herbivorous lineages is critical to understanding how this biodiversity is created and maintained. We characterized the trophic niche of Scaptomyza flava, a representative of a lineage nested within the Drosophila that transitioned to herbivory [~]15 million years ago. We used natural history studies to determine if S. flava is a true herbivore or a cryptic microbe-feeder. Specifically, we quantified oviposition substrate choice and larval viability across food-types, trophic-related morphological traits, and nitrogen isotope and sterol profiles across putatively herbivorous and non-herbivorous drosophilids. We confirmed that S. flava is an obligate herbivore of living plants. Paired with its genetic model host, Arabidopsis thaliana, S. flava is a novel and powerful system for exploring mechanisms underlying the evolution of herbivory, a complex trait that enabled the exceptional diversification of insects.
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