The Effect of Daytime, Tides and Other Factors on Some Activities of Lesser Blacked-backed Gulls, Larus Fuscus

نویسنده

  • JUAN D. DELIUS
چکیده

L'observation du comportement du goeland brun au nid (Larus fuscus) a perm is d'observer 1'effet it long terme de nombreux lacteurs sur le lissage des plumes, le sommeil et d'autres activites non determinees. Le nombre des animaux observes augmentait en raison directe de l' avancement de la saison et en raison inverse des minima thermiques quotidiens. Les maxima thermiques quotidiens sont en correlation positive avec la proportion quotidienne moyenne d'oiseaux endormis. Des oscillations thermiques quotidienne regissent les pourcentages d' animaux qui dorment, mais non pas la proportion de ceux qui se lissent les plumes. De meme les marees influent sur la proportion de goelands endormis et aussi, dans ce cas, sur la proportion de ceux qui se lissent les plumes. Le calcul des intercorrelations residuelles entre les variables du comportement indique que la proportion de ceux qui se lissent les plumes est constante et independante de la proportion des oiseaux endormis ou qui se comportent autrement. Une autre serie d'observation a montre de plus que des perturbations qui abaissent la proportion d'oiseaux endormis et qui au debut font egalement baisser la proportion d' oiseaux qui se lissent les plumes, sont suivies d' augmentations tardives mais prononcees des (lCtivites de lissage. Summary

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تاریخ انتشار 2012