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The influence of density on frequency-dependent food selection: a comparison of four experiments with wild birds

The influence of density on frequency-dependent food selection: a comparison of four experiments with wild birds
The influence of density on frequency-dependent food selection: a comparison of four experiments with wild birds
We compare the results of four experiments, conducted at different times and with different protocols, that explored the relationship between frequency-dependent selection and prey density in wild birds feeding on artificial populations of coloured baits. One (experiment 4) used pastry baits that differed only in the presence or absence of a red stripe, and this experiment provided no evidence for any kind of selective behaviour. The other three experiments used green and brown baits, and they all provided evidence for a trend towards increasing anti-apostatic selection with high densities (>100 baits m–2). However, one of these (experiment 3) provided no evidence for frequency-dependent selection at low densities (0.5–20 baits m–2), while the other two experiments concurred in suggesting a trend towards increasing apostatic selection with low densities (down to 2 baits m–2). Together, these experiments both support and qualify the published findings of experiment 1 that frequency- dependent selection by wild birds on bait populations is modified by density. Experiment 4 indicates that frequency-dependent selection may break down entirely if bait types are too similar, while experiment 3 indicates that some details of this trend with density will depend either on the protocol used or on exogenous changes in the birds’ feeding behaviour.
frequency-dependent selection, apostatic selection, anti-apostatic selection, selective predation, artificial prey
0029-8549
391-395
Weale, M.E.
d1c20288-848d-45d4-974f-fbdd68829a39
Whitwell, D.
13c67180-d2eb-47c5-b929-76ae09e6ef95
Raison, H.E.
d8da5fe9-e46e-449e-bae0-946f9753ae49
Raymond, D.L.
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Allen, J.A.
2a40d9b5-1464-42f0-86c1-69ebb24ea05f
Weale, M.E.
d1c20288-848d-45d4-974f-fbdd68829a39
Whitwell, D.
13c67180-d2eb-47c5-b929-76ae09e6ef95
Raison, H.E.
d8da5fe9-e46e-449e-bae0-946f9753ae49
Raymond, D.L.
0f75bf23-8742-416d-a410-3f9c84f20115
Allen, J.A.
2a40d9b5-1464-42f0-86c1-69ebb24ea05f

Weale, M.E., Whitwell, D., Raison, H.E., Raymond, D.L. and Allen, J.A. (2000) The influence of density on frequency-dependent food selection: a comparison of four experiments with wild birds. Oecologia, 124 (3), 391-395. (doi:10.1007/s004420000399).

Record type: Article

Abstract

We compare the results of four experiments, conducted at different times and with different protocols, that explored the relationship between frequency-dependent selection and prey density in wild birds feeding on artificial populations of coloured baits. One (experiment 4) used pastry baits that differed only in the presence or absence of a red stripe, and this experiment provided no evidence for any kind of selective behaviour. The other three experiments used green and brown baits, and they all provided evidence for a trend towards increasing anti-apostatic selection with high densities (>100 baits m–2). However, one of these (experiment 3) provided no evidence for frequency-dependent selection at low densities (0.5–20 baits m–2), while the other two experiments concurred in suggesting a trend towards increasing apostatic selection with low densities (down to 2 baits m–2). Together, these experiments both support and qualify the published findings of experiment 1 that frequency- dependent selection by wild birds on bait populations is modified by density. Experiment 4 indicates that frequency-dependent selection may break down entirely if bait types are too similar, while experiment 3 indicates that some details of this trend with density will depend either on the protocol used or on exogenous changes in the birds’ feeding behaviour.

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More information

Published date: August 2000
Keywords: frequency-dependent selection, apostatic selection, anti-apostatic selection, selective predation, artificial prey

Identifiers

Local EPrints ID: 55988
URI: https://eprints.soton.ac.uk/id/eprint/55988
ISSN: 0029-8549
PURE UUID: 38016ccd-e36b-4b50-8af9-925dcbde318f

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Date deposited: 21 Aug 2008
Last modified: 17 Jul 2017 14:31

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Contributors

Author: M.E. Weale
Author: D. Whitwell
Author: H.E. Raison
Author: D.L. Raymond
Author: J.A. Allen

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