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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Why do lesser Sheathbills Chionis minor switch territory?
Auteurs :	J. Bried, Auteur ; P. Jouventin, Auteur
Type de document :	Article
Dans :	Journal of Avian Biology (29(3) SEP 1998)
Article en page(s) :	257-265
Langues:	Anglais
Résumé :	Lesser Sheathbills Chionis minor are sedentary and territorial birds which establish their territories and feed in seabird colonies on subantarctic islands. In the Kerguelen Archipelago only, they also live on territories away from seabirds. In this context of contrasting habitats, we examined the determinants and the consequences of territory changes between years. When changing site, Kerguelen sheathbills tended to settle on sites of higher quality; they also chose territories adjacent to their former ones. Moreover, individuals which changed from seabird-free territories moved closer to territories with seabirds, which were the ones of highest quality. Territory switching was not related to poor breeding success the year before changing, compared to individuals which retained their territory. Yet, the sheathbills which changed to an adjacent territory (i) retained their partner more often than those which moved to a more distant site, and (ii) tended to spend less time foraging than the latter during the breeding period following the change. Moreover, adults fledged at least as many chicks as before switching, being more successful if the new territory harboured a seabird colony. The adults which changed from seabird-free sites also enhanced their reproductive outputs on their new territory. Therefore, Lesser Sheathbills changed territory to obtain territories with seabirds, using adjacent territories as "stepping stones" to the latter, which were the most suitable for breeding. Knowledge of food resources on adjacent territories would enable the birds which shifted to these sites to have higher breeding success than those which moved to more distant ones. Moreover, changes towards an adjacent territory might represent a trade-off between improving current breeding status and minimizing the risk of finding oneself without a territory.

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