Herbivores are organisms that obtain the majority of their energy and nutrients by consuming autotrophic plant material or algae, forming a critical trophic level in ecological and biogeochemical systems. They exhibit diverse morphological and physiological adaptations for processing cellulose-rich diets, including specialized dentition, elongated and compartmentalized gastrointestinal tracts, and symbiotic microbiota enabling fermentation and volatile fatty acid production. Herbivory influences plant population dynamics, community composition, and primary productivity, mediating top-down and bottom-up interactions and driving coevolutionary arms races such as chemical defenses and counteradaptations. In ecosystem and food-web models, herbivores are central to energy transfer from primary producers to higher trophic levels and to nutrient cycling through excretion and biomass turnover.
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