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  • 1
    Electronic Resource
    Electronic Resource
    Kinematics of phalarope spinning (1996)
    [s.l.] : Nature Publishing Group
    Nature 384 (1996), S. 121-121 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR — Phalaropes are wading birds that spin on the water, presumably to feed1"5 because they peck while spinning. Recently, we demonstrated with high-speed photography that phalaropes do indeed feed while spinning6. These very small birds are the only vertebrates that spin. Larger birds ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/384121a0
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    Paper (German National Licenses)
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  • 2
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    Foraging ranges of penguins (1989)
    Cambridge University Press
    Details
    Publication Date: 1989-10-01
    Description: Speed/distance meters were deployed on adeliée, gentoo and chinstrap penguins Pygoscelis adeliae, P. papua and P. antarctica, breeding near Anvers Island, Antarctica. Underwater speeds and distances travelled were interspecifically very similar (means of ca. 7–8 km h-1 and 15–45 km, respectively). These results are compared with published data on penguin behaviour at sea obtained by using identical methodology. A simple model, based on penguin activity at sea data, is developed to derive range limits for penguins. Derived range limits are substantially lower than previous estimates but accord well with distributional data obtained by transects.
    Print ISSN: 0032-2474
    Electronic ISSN: 1475-3057
    Topics: Ethnic Sciences , Geography
    Published by Cambridge University Press
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    PAPER CURRENT
  • 3
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    Kinematics of phalarope spinning (1996)
    Springer Nature
    Details
    Publication Date: 1996-11-01
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 4
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    Densities of Antarctic Seabirds at Sea and the Presence of the Krill Euphausia superba (1985)
    Oxford Univ. Press
    In:  The Auk, 102 (3). pp. 540-549.
    Details
    Publication Date: 2020-05-13
    Description: The antarctic krill Euphausia superba forms abundant, well-organized schools in the waters off the Antarctic Peninsula. Mean avian density is 2.6 times greater in waters where krill schools are present than in waters without krill schools. Seabird density is a good predictor of the presence of krill. Seabird density did not correlate with krill density or krill school depth. Disoriented krill routinely were observed swimming near the surface above submerged schools, providing potential prey for surface-feeding birds. Responses of seabird species to the distribution of krill schools varied. The small to medium-size procellariiform species were the best indicators of krill schools; large procellariiforms and coastal species were poor indicators. Pygoscelis penguins occurred at high densities only in the presence of krill schools. These responses are consistent with the constraints imposed by the metabolic requirements and reproductive strategies of each of these groups. Krill schools were detected near the sea surface throughout the day. Correlations between seabird density and the presence of krill during daylight hours suggest that diurnal foraging is important to the seabirds of this region.
    Type: Article , PeerReviewed
    Format: text
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  • 5
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    Marine Birds Feed at Gray Whale Mud Plumes in the Bering Sea (1990)
    Oxford Univ. Press
    In:  The Auk, 107 (4). pp. 678-688.
    Details
    Publication Date: 2020-05-13
    Description: Gray whales (Eschrichtius robustus) feeding in the northern Bering Sea produce prey-rich mud plumes that provide ephemeral foraging opportunities for seabirds. Approximately 67% of all gray whales were attended by birds. In four whale-associating bird species (Northern Fulmar, Fulmarus glacialis; Red Phalarope, Phalaropus fulicaria; Black-legged Kitti-wake, Rissa tridactyla; and Thick-billed Murre, Uria lomvia), from 17 to 87% of all individuals that we observed on the water or foraging were in the whales' mud plumes. The combined density of these same four species was strongly correlated with whale density over a broad range of spatial scales. The whale-associating seabirds exhibited species-specific patterns of foraging behavior at plumes, including differences in mean group size, mean residence time, and patterns of movement between plumes. Birds tended to form larger groups and to form more mixed-species flocks in association with whales. The association of marine birds with gray whales in the Bering Sea provides a model system for examining seabird interactions at fine-scale oceanographic patches and demonstrates the importance of these patches in shaping patterns of seabird distribution and behavior.
    Type: Article , PeerReviewed
    Format: text
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