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Is the rock partridge Alectoris graeca saxatilis threatened in the Dolomitic Alps?

Published online by Cambridge University Press:  06 February 2003

Isabella M. Cattadori
Affiliation:
Department of Biological Sciences, University of Stirling, Scotland FK9 4LA Centro di Ecologia Alpina, Viote del Monte Bondone, 38040 Trento, Italy
Giovanna Ranci-Ortigosa
Affiliation:
Dipartimento di Elettronica e Informazione, Politecnico di Milano, 20133 Milan, Italy
Marino Gatto
Affiliation:
Dipartimento di Elettronica e Informazione, Politecnico di Milano, 20133 Milan, Italy
Peter J. Hudson
Affiliation:
Department of Biological Sciences, University of Stirling, Scotland FK9 4LA
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Abstract

Changes in abundance and the risk of extinction of the rock partridge Alectoris graeca saxatilis in the Dolomitic Alps were investigated using a density-dependent model that incorporated dispersal and environmental stochasticity. The study was based on spring and summer counts collected from sample areas in geographically distinct mountain groups. Extinction probability was investigated by simulating a discrete population and a metapopulation consisting of local populations connected by dispersal. Persistence was not guaranteed when the species was examined as a discrete population. When we used a metapopulation approach, the persistence was assured but local extinctions with subsequent recolonizations of a number of empty areas were observed. The analysis was repeated using hunting statistics, when there were no restrictions on hunting policies, and a similar high extinction pattern was found. Our simulations suggested that long-term persistence of rock partridge could be guaranteed only when immigration was included into the demographic model. However, if the increased population's fragmentation recorded since the 1950s persists the extinction of some of the subpopulations appears inevitable.

Type
Research Article
Copyright
© 2003 The Zoological Society of London

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