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Titolo:
DYNAMICS OF ANTARCTIC PENGUIN POPULATIONS IN RELATION TO INTERANNUAL VARIABILITY IN SEA-ICE DISTRIBUTION
Autore:
TRATHAN PN; CROXALL JP; MURPBY EJ;
Indirizzi:
BRITISH ANTARCTIC SURVEY,NAT ENVIRONM RES COUNCIL,HIGH CROSS,MADINGLEY RD CAMBRIDGE CB3 0ET ENGLAND
Titolo Testata:
Polar biology
fascicolo: 5, volume: 16, anno: 1996,
pagine: 321 - 330
SICI:
0722-4060(1996)16:5<321:DOAPPI>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOUTH ORKNEY ISLANDS; CHINSTRAP PENGUINS; PYGOSCELIS-ADELIAE; MARINE MAMMALS; SIGNY ISLAND; WEDDELL SEA; SEABIRDS; OSCILLATIONS; ECOLOGY; OCEAN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
33
Recensione:
Indirizzi per estratti:
Citazione:
P.N. Trathan et al., "DYNAMICS OF ANTARCTIC PENGUIN POPULATIONS IN RELATION TO INTERANNUAL VARIABILITY IN SEA-ICE DISTRIBUTION", Polar biology, 16(5), 1996, pp. 321-330

Abstract

To investigate the role of sea ice cover on penguin populations we used principal component analysis to compare population variables of Adelie (Pygoscelis adeliae) and chinstrap (Pygoscelis antarctica) penguins breeding on Signy Island, South Orkney Islands with local (from direct observations) and regional (from remote sensing data) sea ice variables. Throughout the study period, the Adelie penguin population size remained stable, whereas that of chinstrap penguins decreased slightly. For neither species were there significant relationships between population size and breeding success, except for an apparent inverse density-dependent relationship between the number of Adelie breeding pairsand the number of eggs hatching. For both species, no general relationship was found between either population size or breeding success andthe local sea ice conditions. However, the regional sea ice extent ata particular time prior to the start of the breeding season was related to the number of birds that arrived to breed. For both species, this period occurred before the sea ice reached its maximum extent and was slightly earlier for Adelie than for chinstrap penguins. These results suggest that sea ice conditions outside the breeding season may play an important role in penguin population processes.

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Documento generato il 02/04/20 alle ore 02:38:44