Functional response: Rigorous estimation and sensitivity to genetic variation in prey

Article Abstract:

A rigorous experimental design is applied where prey density is maintained as a constant in order to investigate how accurate parameter estimation is compared to direct measurement on individuals and how sensitive the disc equation parameters are to generic variation in prey. The issue of whether prey number and patch size can affect functional response in addition to prey density is addressed.

Analysis, Genetic variation

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Prey selection by wild birds can allow novel and conspicuous color morphs to spread in prey populations

Article Abstract:

The wild birds with artificial pastry prey that were colored using food coloring are presented in the color preference experiments. These experiments showed that the immediate demise of a fully palatable new prey morph is not an inevitable outcome of predator behavior, because even very conspicuous prey can gain protection from conservative foragers, simply by being novel.

Animal ecology

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Nonlinear and population-specific offspring sex ratios in relation to high variation in prey abundance

Article Abstract:

Variations in brood sex ratio at fledging in two adjacent harrier populations for respectively 16- and 8-year surveys of both the predator and its prey is analyzed. The results point out that sex ratio analyses should take into account population characteristics, and more generally, environmental variations both in space and time.

Sexual behavior, Predatory animals

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