Neophobia and Dietary Conservatism:Two Distinct Processes?

Birds show distinct hesitation when approaching novel food and this has been termed 'neophobia'. In laboratory-held birds like domestic chicks this effect lasts for a matter of a few minutes at most, but hesitant attack of novel foods can last for weeks or even months in wild birds. This e...

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Bibliographic Details
Published in:Evolutionary ecology 1999-11, Vol.13 (7-8), p.641-653
Main Authors: Marples, N M, Kelly, D J
Format: Article
Language:English
Subjects:
Animal behavior
Aposematism
Birds
Diet
Diets
Ecology
Evolution
Evolutionary biology
Food
Gallus gallus domesticus
Learning
Mimicry
Neophobia
Novel foods
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Summary:Birds show distinct hesitation when approaching novel food and this has been termed 'neophobia'. In laboratory-held birds like domestic chicks this effect lasts for a matter of a few minutes at most, but hesitant attack of novel foods can last for weeks or even months in wild birds. This effect, called 'dietary conservatism', seems to be a different type of learning process from neophobia as first described and has hitherto been largely overlooked. This paper presents some evidence for the view that the processes may be fundamentally different. We outline results from laboratory chicks that show neophobia to be easily deactivated by experience, which renders it unlikely to be an important force in wild birds. We also report evidence that the process of incorporation of novel food into the diet is not a simple one-stage process but includes at least four steps of assessment. The paper concludes with an outline of the importance of dietary conservatism in our understanding of the evolution of aposematism and the workings of mimicry.
ISSN:0269-7653
1573-8477
DOI:10.1023/A:1011077731153