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#herbivores

4 public questions tagged with this topic.

Food Chain and Web

What is the role of primary consumers?

Primary consumers feed directly on producers and transfer part of primary production into animal or microbial consumer biomass. Herbivores, zooplankton, and many seed eaters occupy this role. Their feeding can regulate producer abundance and species composition, while their waste and mortality route nutrients and energy into detrital pathways. They do not produce energy—organisms transform energy—and they do not generally consume herbivores. Their assimilation and production efficiencies determine how much producer energy becomes available to predators. Thermodynamic constraints set broad patt

Ref: Fundamentals of Ecology, Odum & Barrett, 5th Ed., Ch. 3

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Food Chain and Web

Which trophic level includes herbivores?

Herbivores occupy the second trophic level because producers constitute the first. Primary consumers obtain carbon and energy directly from plants, algae, or other autotrophs; predators that eat herbivores occupy the third level. Trophic level is determined by feeding position, not taxonomy, so an omnivorous species can operate at more than one fractional trophic level. Detritivores are often treated separately because their food integrates material derived from several levels, although their energy ultimately originated in primary production. Quantitative interpretation requires explicit syst

Ref: Fundamentals of Ecology, Odum & Barrett, 5th Ed., Ch. 3

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Ecosystem Ecology

Correct statement about herbivores and productivity:

Herbivory can reduce plant productivity most clearly in unproductive ecosystems because plants already face strong nutrient or water limitation and replace lost tissue slowly. Removal of photosynthetic area then deepens resource stress. In productive systems, moderate grazing may be compensated by rapid regrowth, altered allocation, nutrient recycling, or reduced self-shading, although heavy grazing can still depress production. The effect therefore depends on grazing intensity, plant traits, and resource availability. Energy is lost as metabolic heat at every trophic transfer, while elements

Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 17-19

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