65 resultados para Puffinus anglorum.


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At head of title: Reprinted from the Transactions of the Norfolk and Norwich naturalists' society. v.iv.

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Baluzianus

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Acquis en décembre 1819 de MM. de Bure, libraires du roi, suite à la vente de la bibliothèque de l'abbé de Tersan, pour le prix de 65 francs; cf. B.n.F., département des Manuscrits, Archives Modernes 492bis, registre des acquisitions du département des Manuscrits 1806-1820, f. 269 et 272; Archives Modernes 492ter, registre des acquisitions du département des Manuscrits 1821-1830, f. 172 "Poema de miseriis guerrae Anglorum, in 8° sur velin"; nouv. acq. fr. 5523, f. 145; Catalogue Tersan, n° 1177; — ex-libris du XVIe s. "L. de Kalkemberga" (1v)

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The loss of species during the Holocene was, dramatically more important on islands than on continents. Seabirds from islands are very vulnerable to human-induced alterations such as habitat destruction, hunting and exotic predators. For example, in the genus Puffinus (family Procellariidae) the extinction of at least five species has been recorded during the Holocene, two of them coming from the Canary Islands.

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Trophic ecology and movements are critical issues for understanding the role of marine predators in food webs and for facing the challenges of their conservation. Seabird foraging ecology has been increasingly studied, but small elusive species, such as those forming the"little shearwater" complex, remain poorly known. We present the first study on the movements and feeding ecology of the Barolo shearwater Puffinus baroli baroli in a colony from the Azores archipelago (NE Atlantic), combining global location-sensing units, stable isotope analyses of feathers (δ13C and δ15N), stomach flushings and data from maximum depth gauges. During the chick-rearing period, parents visited their nests most nights, foraged mainly south of the colony and fed at lower trophic levels than during the non-breeding period. Squid was the most diverse prey (6 families and at least 10 different taxa), but species composition varied considerably between years. Two squid families, Onychoteuthidae and Argonautidae, and the fish family Phycidae accounted for 82.3% of ingested prey by number. On average, maximum dive depths per foraging trip reached 14.8 m (range: 7.9 to 23.1 m). After the breeding period, birds dispersed offshore in all directions and up to 2500 km from the breeding colony, and fed at higher trophic levels. Overall, our results indicate that the Barolo shearwater is a non-migratory shearwater feeding at the lowest trophic level among Macaronesian seabirds, showing both diurnal and nocturnal activity and feeding deeper in the water column, principally on small schooling squid and fish. These traits contrast with those of 3 other Azorean Procellariiformes (Cory"s shearwater Calonectris diomedea, the Madeiran storm-petrel Oceanodroma castro and Monteiro"s storm-petrel O. monteiroi), indicating ecological segregation within the Azorean seabird community.