Abstract
I measured impacts of American coots (Fulica americana) on hydrilla (Hydrilla verticillata) depth and biomass and assessed the role of herbivory on the seasonal decline of hydrilla. Differences in hydrilla depth between exclosures and open frames increased progressively in association with increased herbivory by coots. Hydrilla appears able to rebound well from yearly declines caused by a combination of herbivory and climate, and provides an abundant, renewable, and highly-used food resource for American coots and other wetland birds
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