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Titolo:
Interannual changes in body fat condition index of minke whales in the Antarctic
Autore:
Ichii, T; Shinohara, N; Fujise, Y; Nishiwaki, S; Matsuoka, K;
Indirizzi:
Natl Res Inst Far Seas Fisheries, Shimizu, Shizuoka 4248633, Japan Natl Res Inst Far Seas Fisheries Shimizu Shizuoka Japan 4248633 33, Japan Tokai Univ, Fac Marine Sci & Technol, Shimizu, Shizuoka 4248610, Japan Tokai Univ Shimizu Shizuoka Japan 4248610 himizu, Shizuoka 4248610, Japan Inst Cetacean Res, Chuo Ku, Tokyo 1040055, Japan Inst Cetacean Res TokyoJapan 1040055 Res, Chuo Ku, Tokyo 1040055, Japan
Titolo Testata:
MARINE ECOLOGY-PROGRESS SERIES
, volume: 175, anno: 1998,
pagine: 1 - 12
SICI:
0171-8630(1998)175:<1:ICIBFC>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
ROSS SEA; KRILL; FOOD; CONSUMPTION; PENGUINS;
Keywords:
minke whale; Balaenoptera acutorostrata; feeding ecology; body fat condition index; Antarctic krill; Euphausia superba; sea ice; Ross Sea;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Ichii, T Natlapan Inst Far Seas Fisheries, 5-7-1 Orido, Shimizu, Shizuoka 4248633, J Natl Res Inst Far Seas Fisheries 5-7-1 Orido Shimizu Shizuoka Japan 4248633
Citazione:
T. Ichii et al., "Interannual changes in body fat condition index of minke whales in the Antarctic", MAR ECOL-PR, 175, 1998, pp. 1-12

Abstract

To study whether or not wide-ranging pelagic predators should be affected by localized changes in prey availability, interannual variability in body fat condition index (assessed from girth measurements) of minke whales Balaenoptera acutorostrata was analyzed in relation to their distribution, stomach-content mass and sea-ice extent during the austral summer in the Antarctic Ocean between 130 degrees E and 170 degrees W. The research area comprised offshore, ice-edge and Ross Sea areas. Of the 3 years (1990/91, 1992/93and 1994/95) included in the study, 1994/95 was a year of significantly poor body fat condition compared with the other 2 years. The 1994/95 year wascharacterized by extensive sea-ice conditions, covering the usually krill-rich slope region throughout the season. Since minke whales were scarce andtheir stomach-content mass small in the ice-edge area during 1994/95, foodavailability in the area during the season was considered to be poor as a result of the high sea-ice extent. Antarctic krill Euphausia superba was regularly the dominant prey species throughout the survey area, although on the Ross Sea shelf E. crystallorophias was the codominant prey with E. superba. The spatial distribution of body size and maturity of E. superba indicated apparent unsuitability of the Ross Sea area as a nursery and spawning ground for that species. The Ross Sea area was considered to be an area of low food supply throughout the study period, considering the lower level of stomach contents. Paradoxically, this area usually contained numerous minkewhales, especially pregnant females. In conclusion, minke whales appear tohave been affected by considerable interannual variability in food availability in the ice-edge area, i.e. potentially the most krill-rich area alongtheir migratory route.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 10:15:30