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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Effects of handling stress on Brunnich's Guillemots Uria lomvia
Auteurs :	Linda J. Wilson, Auteur ; Anthony J. Gaston, Auteur
Type de document :	Article
Dans :	Ringing & Migration (20(4) November, 2001)
Article en page(s) :	320-327
Résumé :	The effects of various handling procedures on breeding Brunnich's Guillemot Uria lomvia were compared, using the length of time it took for individuals to return to the colony after handling (return time), to indicate the degree of stress imposed. Return times were affected by sex, with males taking longer to return than females. There was no significant effect of experience (age), although experienced males (>7 years old, the largest sample group) tended to have shorter return times than inexperienced males. Only experienced males were used to compare the effects of treatment on return times. Treatments included attachment of depth gauges, blood sampling, and two control groups of birds held for 10 and 20 minutes. Return times did not differ significantly among treatments, except for the group that was held for 20 minutes. Return times were significantly correlated with handling times. We conclude that, for experienced male Brunnich's Guillemots, the type of treatment used did not have any significant effect over and above that imposed by the amount of time the bird was held. The results suggest that treatment during handling may not be an important factor determining stress, compared to the effect of capture and the subsequent amount of time spent in captivity.

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