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Titolo:
DOUBLE MIGRATIONS OF THE NORTHERN ELEPHANT SEAL, MIROUNGA-ANGUSTIROSTRIS
Autore:
STEWART BS; DELONG RL;
Indirizzi:
HUBBS SEA WORLD RES INST,2595 INGRAHAM ST SAN DIEGO CA 92109 NOAA,NATL MARINE FISHERIES SERV,NATL MARINE MAMMAL LAB SEATTLE WA 98115
Titolo Testata:
Journal of mammalogy
fascicolo: 1, volume: 76, anno: 1995,
pagine: 196 - 205
SICI:
0022-2372(1995)76:1<196:DMOTNE>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
TAILED DEER; HABITAT USE; SEGREGATION; SATELLITE; TRACKING; PATTERNS;
Keywords:
MIGRATION; DIVING; MIROUNGA ANGUSTIROSTRIS; NORTHERN ELEPHANT SEAL; PINNIPEDS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
43
Recensione:
Indirizzi per estratti:
Citazione:
B.S. Stewart e R.L. Delong, "DOUBLE MIGRATIONS OF THE NORTHERN ELEPHANT SEAL, MIROUNGA-ANGUSTIROSTRIS", Journal of mammalogy, 76(1), 1995, pp. 196-205

Abstract

Adult northern elephant seals go to sea twice each year for periods of less than or equal to 8 months during which they range widely in thenorthern Pacific Ocean. Using new tracking technology, we showed thatthe species (and individuals) returned to the same foraging areas during postbreeding and postmolt movements, documenting the first double migration for any animal. We also showed segregation by sex during both migrations, the causes of which are unknown. Seals dove continually to depths of 250-550 m during both migrations and travelled Linear distances of at least 18,000 (females)-21,000 km (males) during the 250 (males)-300 (females) days they were at sea. These are the longest annual migrations yet recorded for individual mammals. The double migrations apparently are modulated by the requirement for seals to return to land twice each year, to molt and to breed, although the reasons sealsfavor distant molting sites on the California Channel Islands over island and continental beaches nearer foraging areas are unknown.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 13:53:28