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Do helminths increase the vulnerability of released pheasants to fox predation?

Published online by Cambridge University Press:  22 February 2007

J. Millán*
Affiliation:
Instituto de Investigación en Recursos Cinegéticos (IREC, CSIC-UCLM), PO Box 535, E-13080 Ciudad Real, Spain
C. Gortázar
Affiliation:
Instituto de Investigación en Recursos Cinegéticos (IREC, CSIC-UCLM), PO Box 535, E-13080 Ciudad Real, Spain
P. Tizzani
Affiliation:
Dipartimento di Produzioni Animali, Epidemiologia ed Ecologia, Facoltà di Medicina Veterinaria, Università degli Studi di Torino, Torino, Italy
F.J. Buenestado
Affiliation:
Instituto de Investigación en Recursos Cinegéticos (IREC, CSIC-UCLM), PO Box 535, E-13080 Ciudad Real, Spain
*Corresponding
*Fax: +34 926 295451 E-mail: jmillan@irec.uclm.es

Abstract

The success of ring-necked pheasant (Phasianus colchicus) restocking in Asturias, northern Spain was assessed, and the role of parasites and predators in the mortality of released birds was studied. The experimental release of 56 radio-tagged pheasants showed that 98% of birds died within 12 days. As soon as 72 h after release, 67.5% of males and 55.0% of females were found dead. Foxes (Vulpes vulpes) killed 63% of the birds. The survival of those birds killed by foxes was lower than for birds which died due to other causes, and pheasants depositing eggs of the nematode Eucoleus contortus (Creplin, 1839) survived less than those apparently non-parasitized. No impact of the parasite on the pheasants' condition was found, but foxes preyed upon parasitized birds more than expected by random. The results suggest that: (i) the current pheasant releases in this area are unsuccessful and need to be improved; (ii) this is mainly due to intense predation by red foxes; and (iii) parasites could have some influence on the predation of released birds by foxes. However, the way parasites affect pheasant vulnerability remains unclear.

Type
Other
Copyright
Cambridge University Press 2002

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Do helminths increase the vulnerability of released pheasants to fox predation?
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