Physiological responses of plant populations to herbivory and their consequences for ecosystem nutrient flow

Article Abstract:

The influence of the physiological responses of plant populations to herbivory on ecosystem nutrient flow was investigated. Grazing-tolerant and grazing-intolerant plant populations were compared with respect to production, carbon allocation and nitrogen allocation. The production and allocation responses were incorporated into a nutrient-cycling simulation model. The results showed that increased nitrogen availability was a result of feedbacks between responses to grazing and nitrogen cycling. This feedback was more important than the fertilization effects of animal waste deposition.

Physiological aspects, Primary productivity (Biology), Grazing, Biogeochemical cycles

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Regrowth following herbivory in Ipomopsis aggregata: compensation but not overcompensation

Article Abstract:

Herbivory is not beneficial to individuals being grazed. This overturns Paige and Whitham's contention that herbivory may actually increase plant fitness since many plants can compensate for the tissue depleted by herbivores, citing in particular Ipomopsis aggregata. It is maintained that there is no solid proof of overcompensation in natural populations of I. aggregata or any other plant species. This affirms the results of an earlier study which consistently failed to detect overcompensation in 14 populations located in five states.

Analysis, Herbivores, Regeneration (Botany)

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Competition, herbivory, and enrichment: nutrient-based models for edible and inedible plants

Article Abstract:

The models of edible and inedible plants forecasts compensatory changes in relative densities at equilibrium as herbivore loss rate changes. Inedible plant biomass increases with nutrient supply if they do not interact with herbivore otherwise biomass of both edible and inedible plants increases with nutrient supply. If inedible plants interfere with ingestion of edible plants without being consumed then there is stability in equilibria for a parameterized model of a planktonic system.

Health aspects, Models, Plants, Plants (Organisms), Plants, Edible, Edible plants

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