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Foraging behaviour of Nuthatches(Sitta europaea) in relation to the presence of mates and mixed flocks

Nahrungssuche beim Kleiber (Sitta europaea) im Paarverbund und in gemischten Schwärmen

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Summary

Nuthatches (Sitta europaea) usually forage in pairs outside the breeding season. I investigated whether foraging site selection in winter (tree species, height, substrate size) differed between sexes and whether this difference was related to the presence of mixed-species flocks. Foraging sites of pair members foraging together were highly correlated. In the rare cases when each used different tree species, males foraged significantly more often on the preferred oak trees than females. Males foraged significantly lower than females in some territories, but not in others. The reasons for this significant variation between pairs remains unexplained. Males also foraged lower than females in the company of mixed flocks. These differences are probably better explained as avoidance of the dominant male by the subordinate female, rather than specialization in resource use to avoid competition.

Zusammenfassung

Außerhalb der Brutzeit fouragieren Kleiber gewöhnlich in Paaren. Ich untersuchte, ob sich die Geschlechter in der Wahl des winterlichen Nahrungsortes (Baumart, Höhe, Astdicke) unterscheiden und ob solche Unterschiede durch die Anwesenheit von gemischten Schwärmen beeinflußt ist. Die Ortswahl der gemeinschaftlich auf Nahrungssuche gehenden Paarpartner war hoch korreliert. In den seltenen Fällen, in denen sich die Partner an verschiedenen Bäumen aufhielten, fanden sich die Männchen signifikant mehr an den der Art bevorzugten Eichen als die Weibchen. In einigen Revieren fouragierten die Männchen an signifikant niedrigeren Standorten als die Weibchen, doch war dies nicht in allen Revieren der Fall. Die Ursachen für diese Unterschiede sind nicht bekannt. Auch in gemischten Schwärmen erfolgte die Nahrungssuche der Männchen niedriger als die der Weibchen. Möglicherweise vermeiden die Weibchen so die Konkurrenz durch die dominanten Männchen.

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Matthysen, E. Foraging behaviour of Nuthatches(Sitta europaea) in relation to the presence of mates and mixed flocks. J Ornithol 140, 443–451 (1999). https://doi.org/10.1007/BF01650988

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