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Does an optimally foraging oystercatcher obey the functional response?
Wanink, J.H.; Zwarts, L. (1985). Does an optimally foraging oystercatcher obey the functional response? Oecologia 67(1): 98-106. https://dx.doi.org/10.1007/BF00378457
In: Oecologia. Springer: Heidelberg; Berlin. ISSN 0029-8549; e-ISSN 1432-1939
Peer reviewed article  
Beschikbaar in  Auteurs 
Trefwoorden
    Aquatic communities > Benthos
    Aquatic organisms > Food organisms
    Behaviour > Feeding behaviour
    Behaviour > Feeding behaviour > Foraging behaviour
    Diets
    Dimensions > Depth
    Interspecific relationships > Predation > Prey selection
    Population characteristics > Population density
    Haematopus ostralegus Linnaeus, 1758 [WoRMS]; Scrobicularia plana (da Costa, 1778) [WoRMS]
    Marien/Kust
Auteurs  Top 
  • Wanink, J.H.
  • Zwarts, L.
Abstract
    1) We describe an experimental test of the optimal diet model. An oystercatcher was offered bivalves Scrobicularia plana which were buried in the substrate at different depths. All prey were of equal length and thus of equal energy content. Since handling time increased with depth, deep-lying prey were less profitable. (2) From the known increase of handling and search time with depth we were able to predict for each prey density which depth classes should be ignored by the bird so as to maximize its intake rate. (3) The observed depth selection and intake rate were as predicted for the lower prey densities. At high prey densities the observed number of prey taken rose above the predicted intake rate. We suggest that the bird started to ignore closed bivalves with long handling times. (4) The observed relationship between prey density and intake rate could not be described by Holling's type-2 functional response, because the handling time and the rate of discovery were density-related. A multi-species functional response is necessary to describe the intake rate of an optimally feeding predator
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