Inducible defenses and the paradox of enrichment

Article Abstract:

Models of bitrophic and tritrophic food chains that incorporate consumer-induced polymorphisms were analyzed to evaluate the effects of inducible defenses on community stability and persistence. The models predicted that intraspecific heterogeneity in defense levels resolved the paradox of enrichment for a range of top-down effects that affect consumer death rates and for all possible levels of primary productivity.

Models, Analysis, Genetic polymorphisms, Food chains (Ecology), Food chains, Animal reproduction

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The use of a flexible patch leaving under exploitative competition: A field test with swans

Article Abstract:

A flexible patch leaving threshold (PLT) while foraging in a depletable environment under exploitative competition was used and the swan's patch residence time was measured by combining recordings of the foraging behavior and movement paths. The observed patch residence times did not decrease with time and were intermediate between those predicted for swans with flexible and fixed PLTs.

Swans, Foraging, Foraging (Animal feeding behavior)

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A quantitative test of the size efficiency hypothesis by means of a physiologically structured model

Article Abstract:

A standard physiologically structured Daphnia model is applied to the size efficiency hypothesis in an attempt to bridge the gap between empirical and theoretical approaches. This is mainly aimed to predict differential predation levels needed to switch the balance from one species to the other by means of competition for food.

Animal populations, Population biology, Daphnia

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