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Titolo:
ACTIVITY AND METABOLISM OF LARVAL ATLANTIC COD (GADUS-MORHUA) FROM SCOTIAN SHELF AND NEWFOUNDLAND SOURCE POPULATIONS
Autore:
VONHERBING IH; BOUTILIER RG;
Indirizzi:
HARBOR BRANCH OCEANOG INST INC,5600 US 1 N FT PIERCE FL 34946 DALHOUSIE UNIV,DEPT BIOL HALIFAX NS B3H 4J1 CANADA UNIV CAMBRIDGE,DEPT ZOOL CAMBRIDGE ENGLAND
Titolo Testata:
Marine Biology
fascicolo: 4, volume: 124, anno: 1996,
pagine: 607 - 617
SICI:
0025-3162(1996)124:4<607:AAMOLA>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
LIFE-HISTORY STAGES; MARINE FISH LARVAE; OXYGEN-CONSUMPTION; ENGRAULIS-MORDAX; TEMPERATURE; ENERGETICS; CYPRINIDS; BEHAVIOR; ANCHOVY; SIZE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
39
Recensione:
Indirizzi per estratti:
Citazione:
I.H. Vonherbing e R.G. Boutilier, "ACTIVITY AND METABOLISM OF LARVAL ATLANTIC COD (GADUS-MORHUA) FROM SCOTIAN SHELF AND NEWFOUNDLAND SOURCE POPULATIONS", Marine Biology, 124(4), 1996, pp. 607-617

Abstract

Patterns of activity and metabolism were investigated in larval Atlantic cod (Gadus morhua L.) between December 1991 and July 1992: (1) throughout larval development; (2) between two genetically discrete populations (Scotian Shelf and Newfoundland) and (3) as a function of two different culture temperatures. During the yolk-sac stage (0 to 5 d post-hatch), changes in swimming speed were not related to mass-specific metabolic rates; no portion of the mass-specific oxygen consumption could be explained by changes in activity. In the ''mixed feeding'' stage (6 to 14 d posthatch), there was a tendency for oxygen consumption to be related to changes in swimming speed. In the ''exogenous feeding'' stage( > 14 d post-hatch), oxygen consumption significantly increased with swimming speed. These ontogenetic patterns of activity and metabolism were the same for larvae from the Scotian Shelf and Newfoundland populations. However, over the entire larval life and among ontogenetic stages, the metabolic cost of activity (Delta mass-specific O-2 consumption/Delta swimming speed) of Scotian Shelf larvae was significantly higher than that of Newfoundland larvae. When cod larvae, that haddeveloped at 5 degrees C, were acutely exposed to 10 degrees C, Scotian Shelf larvae had a higher intrinsic cost of activity than Newfoundland larvae, over the entire larval life. During the exogenous feeding stage, the mean metabolic cost of activity for Newfoundland larvae raised at 10 degrees C and tested at 10 degrees C was significantly higher and more variable than that of larvae raised at lower temperatures. However, the metabolic cost of activity of larvae raised and tested at10 degrees C was not significantly different between source populations. Together these findings suggest that differences in swimming energetics reflect changing energy requirements for activity among ontogenetic stages, and reflect adaptation to regional environments among genetically discrete populations.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/07/20 alle ore 12:39:49