Ardea
Official journal of the Netherlands Ornithologists' Union

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Migot P. (1992) Demographic-changes in French Herring Gull Larus argentatus populations - a modeling approach and hypotheses concerning the regulation of numbers. ARDEA 80 (1): 161-169
This work presents an interpretation of the domographic changes in the French Herring Gull Larus argentatus population recorded since 1850. Data obtained by a Leslie matrix model, together with population parameters resulting from field work and subsequent simulations, suggest that at present a large proportion of potentially mature birds does not breed. I discuss the parameter 'proportion of breeders' (with 'immigration' versus 'emigration' as intrinsic and extrinsic elements of recruitment, respectively), together with its suggested role in the population regulation of the gulls.


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