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Titolo:
Computer simulations of the effects of the Sitka eddy on the migration of sockeye salmon returning to British Columbia
Autore:
Healey, MC; Thomson, KA; Leblond, PH; Huato, L; Hinch, SG; Walters, CJ;
Indirizzi:
Univ British Columbia, Dept Oceanog, Vancouver, BC V6T 1Z4, Canada Univ British Columbia Vancouver BC Canada V6T 1Z4 ver, BC V6T 1Z4, Canada Univ British Columbia, Fisheries Ctr, Vancouver, BC V6T 1Z4, Canada Univ British Columbia Vancouver BC Canada V6T 1Z4 ver, BC V6T 1Z4, Canada Inst Politecn Nacl, Ctr Interdisciplinaro Ciencias Marinas, La Paz, BCX, Mexico Inst Politecn Nacl La Paz BCX Mexico encias Marinas, La Paz, BCX, Mexico Univ British Columbia, Dept Forest Sci, Vancouver, BC V6T 1Z4, Canada UnivBritish Columbia Vancouver BC Canada V6T 1Z4 ver, BC V6T 1Z4, Canada
Titolo Testata:
FISHERIES OCEANOGRAPHY
fascicolo: 3, volume: 9, anno: 2000,
pagine: 271 - 281
SICI:
1054-6006(200009)9:3<271:CSOTEO>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
NORTHEAST PACIFIC-OCEAN; FRASER-RIVER; ONCORHYNCHUS-NERKA; BIOENERGETICS; ALASKA; MODEL;
Keywords:
bioenergetics; individual-based modelling; mesoscale eddies; Sitka eddy; sockeye salmon migration;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Healey, MC Univ British Columbia, Dept Earth & Ocean Sci, Vancouver, BC V6T 1Z4, Canada Univ British Columbia Vancouver BC Canada V6T 1Z4 1Z4, Canada
Citazione:
M.C. Healey et al., "Computer simulations of the effects of the Sitka eddy on the migration of sockeye salmon returning to British Columbia", FISH OCEANO, 9(3), 2000, pp. 271-281

Abstract

The Sitka eddy is a mesoscale eddy, 300 km in diameter, that develops off SE Alaska in about one year in two. The eddy has surface currents exceeding50 km day(-1) and it has been suggested that the eddy could deflect migrating salmon to the south, thereby reducing the proportion of British Columbia (BC) sockeye salmon accessible to Alaskan fishers. We modelled its effects on the migration of sockeye salmon (Oncorhynchus nerka) returning to northern BC, using an individual-based model to simulate migration paths, migration timing and metabolic costs of salmon with different migration behaviours. Except when their migration behaviour included positive rheotaxis, salmon that encountered the eddy had faster migration times and lower metaboliccosts than those that did not. The least complex migration behaviour, compass orientation with no rheotaxis, was only slightly less efficient in metabolic terms than the optimal migration paths determined by dynamic programming. Our simulations show that the Sitka eddy itself does not deflect migrating salmon to the south or south-east regardless of migration behaviour, but that by interrupting the normal northward flow of the Alaskan Current, the eddy could influence latitude of landfall of migrating salmon.

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Documento generato il 02/04/20 alle ore 02:58:06