Experimental functional response and inter-individual variation in foraging rate of teal (Anas crecca)

LIBRIS-ID:oai:researchportal.hkr.se/admin:publications/48fdeef1-eedb-4dd1-8c0a-d6087f987fd7
oai:researchportal.hkr.se/admin:publications/48fdeef1-eedb-4dd1-8c0a-d6087f987fd7URI
https://doi.org/10.1016/j.beproc.2007.01.001DOI

The functional response, i.e. the change in per capita food intake rate per time unit with changed food availability, is a widely used too] for understanding the ecology and behaviour of animals. However, waterfowl remain poorly explored in this context. In an aviary experiment we derived a functional response curve for teal (Anas crecca) foraging on rice (Oryza sativa) seeds. We found a linear relationship between intake rate and seed density, as expected for a filter-feeder. At high seed densities we found a threshold, above which intake rate still increased linearly but with a lower slope, possibly reflecting a switch from filter-feeding to a scooping foraging mode. The present study shows that food intake rate in teal is linearly related to food availability within the range of naturally occurring seed densities, a finding with major implications for management and conservation of wetland habitats.

Guillemain, M.Office national de la chasse et de la faune sauvage (author)
Gurd, D.B.Centre for Wildlife Ecology, Department of Biological Sciences, Simon Fraser University, Burnaby, BC,Centre for Wildlife Ecology, Department of Biological Sciences, Simon Fraser University, Burnaby, BC (author)
Elmberg, JohanKristianstad University,Akvatisk biologi och kemi (author)
Fritz, H.Centre d'Etudes Biologiques de Chizé,Centre d’Études Biologiques de Chizé (author)
Arnaud, A.Tour du Valat,Centre de Recherche de la Tour du Valat, Arles (author)
Pin, C.Tour du Valat,Centre de Recherche de la Tour du Valat, Arles (author)
Bosca, F.Office national de la chasse et de la faune sauvage (author)
Kristianstad UniversityOffice national de la chasse et de la faune sauvage (creator_code:org_t)

oai:researchportal.hkr.se/admin:publications/48fdeef1-eedb-4dd1-8c0a-d6087f987fd7
https://doi.org/10.1016/j.beproc.2007.01.001

By the author/editor: Arzel, Celiné; Guillemain, M.; Gurd, D.B.; Elmberg, Johan; Fritz, H.; Arnaud, A.; show more...; Pin, C.; Bosca, F.; show less...

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