The Effect of Daytime, Tides and Other Factors on Some Activities of Lesser Blacked-backed Gulls, Larus Fuscus
نویسنده
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
منابع مشابه
Interspecific differences in foraging preferences, breeding performance and demography in herring (Larus argentatus) and lesser black-backed gulls (Larus fuscus) at a mixed colony
Herring gulls Larus argentatus and lesser black-backed gulls Larus fuscus breeding at Walney Island, Cumbria, the largest breeding colony of the two species in the UK, have recently shown very different population trends. The former has declined sharply, whereas numbers of the latter have been maintained for several years. Here we compare aspects of the feeding and breeding ecology of the two s...
متن کاملPhylogeography and colonization history of Lesser Black-backed Gulls (Larus fuscus) as revealed by mtDNA sequences
Because of the differential amplitude of climatic oscillations, species living at northern latitudes are subject to more frequent and more severe range oscillations than species at southern latitudes. As a consequence, northern populations should, on average, be phylogenetically younger and possess less phylogeographical structure than closely related taxa further south. To test these predictio...
متن کاملInterspecific Allozyme Differentiation among North Atlantic White-headed Larid Gulls
ABSTR•CT.--I assessed patterns of allozymic variation in Larus argentatus (Herring Gulls), L. cachinnans (Yellow-legged Herring Gulls), L. fuscus (Lesser Black-backed Gulls), L. glaucoides (Iceland Gull), L. hyperboreus (Glaucous Gulls), and L. marinus (Greater Black-backed Gull). I surveyed 34 presumed structural gene loci over 479 individuals. All birds were monomorphic and fixed for the same...
متن کاملVariation in Immune Parameters and Disease Prevalence among Lesser Black-Backed Gulls (Larus fuscus sp.) with Different Migratory Strategies
The ability to control infections is a key trait for migrants that must be balanced against other costly features of the migratory life. In this study we explored the links between migration and disease ecology by examining natural variation in parasite exposure and immunity in several populations of Lesser Black-backed Gulls (Larus fuscus) with different migratory strategies. We found higher a...
متن کاملVarying foraging patterns in response to competition? A multicolony approach in a generalist seabird
Reducing resource competition is a crucial requirement for colonial seabirds to ensure adequate self- and chick-provisioning during breeding season. Spatial segregation is a common avoidance strategy among and within species from neighboring breeding colonies. We determined whether the foraging behaviors of incubating lesser black-backed gulls (Larus fuscus) differed between six colonies varyin...
متن کامل