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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Parasite tags in ecological studies of terrestrial hosts: a study on ptarmigan (Lagopus spp.) dispersal
Auteurs :	P. R. Holmstad, Auteur ; O. Holstad, Auteur ; G. Karbol, Auteur ; J. O. Revhaug, Auteur ; E. Schei, Auteur ; V. Vandvik, Auteur ; A. Skorping, Auteur
Type de document :	Article
Dans :	Ornis Fennica (81(3) 2004)
Article en page(s) :	128-136
Langues:	Anglais
Résumé :	The spatial distributions of parasites may provide valuable information in studies on host ecology. This study was conducted in Troms County, Northern Norway, and focussed on the spatial and temporal variation in abundance of two nematode parasites, Ascaridia compar and Trichostrongylus tenuis, infecting the gastrointestinal tract of Willow Ptarmigan (Lagopus lagopus) and Rock Ptarmigan (Lagopus mutus). In an inland area prevalence of A. compar varied between 52.2-78.1% in September during 6 years of sampling, and in a coastal area that was sampled for 10 years, the prevalence of T tenuis ranged between 25.0-75.4%. Both nematodes attained significantly higher prevalences in willow ptarmigan than in Rock Ptarmigan. The nematodes showed marked differences in geographical distributions in September, where A. compar was common at inland localities while T tenuis only was found in hosts at coastal islands. Practical use of these parasites as biological tags suggested a coast to inland winter dispersal in Rock Ptarmigan, especially among juvenile hens, but no dispersal was recorded in Willow Ptarmigan. The use of biological tags in general and the use of nematodes as indicators of ptarmigan dispersal are discussed.

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