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Titolo:
CARDIAC-OUTPUT AS A PREDICTOR OF METABOLIC-RATE IN COD GADUS-MORHUA
Autore:
WEBBER DM; BOUTILIER RG; KERR SR;
Indirizzi:
DALHOUSIE UNIV,DEPT BIOL HALIFAX NS B3H 4J1 CANADA UNIV CAMBRIDGE,DEPT ZOOL CAMBRIDGE CB1 3EJ ENGLAND
Titolo Testata:
Journal of Experimental Biology
fascicolo: 19, volume: 201, anno: 1998,
pagine: 2779 - 2789
SICI:
0022-0949(1998)201:19<2779:CAAPOM>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
HEART-RATE TELEMETRY; ATLANTIC COD; CARDIOVASCULAR-RESPONSES; ONCORHYNCHUS-MYKISS; NATURAL-ENVIRONMENT; RAINBOW-TROUT; BIOENERGETICS MODELS; ULTRASONIC TELEMETRY; OXYGEN-CONSUMPTION; CYPRINUS-CARPIO;
Keywords:
GADUS MORHUA; ATLANTIC COD; OXYGEN CONSUMPTION; CARDIAC OUTPUT; HEART RATE; STROKE VOLUME; BIOENERGETICS; METABOLISM; FISH;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
68
Recensione:
Indirizzi per estratti:
Citazione:
D.M. Webber et al., "CARDIAC-OUTPUT AS A PREDICTOR OF METABOLIC-RATE IN COD GADUS-MORHUA", Journal of Experimental Biology, 201(19), 1998, pp. 2779-2789

Abstract

Adult Atlantic cod (2 kg Gadus morhua) were fitted with Doppler ultrasonic flow-probes to measure ventral aortic outflow (i.e. cardiac output). The probes remained patent for upwards of 3 months, during which time detailed relationships between cardiac output ((Q) over dot), heart rate (fH) and rate of oxygen consumption ((M) over dot O-2,) were determined as a function of swimming speed and temperature (5 degrees Cand 10 degrees C), The rate of oxygen consumption increased linearly with (Q) over dot and exponentially with swimming speed. A very good correlation was observed between (M) over dot O-2 and (Q) over dot (r(2)=0.86) compared with the correlation between (M) over dot O-2, and fH(r(2)=0.50 for all 10 degrees C data and r(2)=0.86 for all 5 degrees C data). However, the (M) over dot O-2, versus fH correlation gradually improved over approximately 1 week after surgery (r(2)=0.86). The relationship between (M) over dot O-2, and (Q) over dot was independent of temperature, while the relationship between (M) over dot O-2, and fH changed with temperature. Hence, calculating (M) over dot O-2, from (Q) over dot is simpler and does not require that temperature be recorded simultaneously. Variations in cardiac output were determined more by changes in stroke volume (Vs) than by fH; therefore, fH was a less reliable predictor of metabolic rate than was (Q) over dot. Given that(Q) over dot can be used to estimate (M) over dot O-2, so faithfully,the advent of a cardiac output telemeter would enable robust estimates to be made of the activity metabolism of free-ranging fish in nature, thereby strengthening one of the weakest links in the bioenergetic models of fisheries biology.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/07/20 alle ore 15:59:02