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Ecology Letters · 2023 · Vol. 26 · Issue 8 · Wiley
Herbivory is a dominant feeding strategy among animals, yet herbivores are often protein limited. The gut microbiome is hypothesized to help maintain host protein balance by provisioning essential macromolecules, but this has never been tested in wild consumers. Using amino acid carbon (δ 13 C) and nitrogen (δ 15 N) isotope analysis, we estimated the proportional contributions of essential amino acids (AA ESS ) synthesized by...