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Titolo:
Gill and intestinal Na+-K+ ATPase activity, and estimated maximal osmoregulatory costs, in three high energy-demand teleosts: yellowfin tuna (Thunnusalbacares), skipjack tuna (Katsuwonus pelamis), and dolphin fish (Coryphaena hippurus)
Autore:
Brill, R; Swimmer, Y; Taxboel, C; Cousins, K; Lowe, T;
Indirizzi:
Univ Hawaii Manoa, Sch Ocean & Earth Sci & Technol, Joint Inst Marine & Atmospher Res, Pelag Fisheries Res Program, Honolulu, HI 96822 USA Univ Hawaii Manoa Honolulu HI USA 96822 s Program, Honolulu, HI 96822 USA
Titolo Testata:
MARINE BIOLOGY
fascicolo: 5, volume: 138, anno: 2001,
pagine: 935 - 944
SICI:
0025-3162(200105)138:5<935:GAINAA>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
TILAPIA OREOCHROMIS-MOSSAMBICUS; STANDARD METABOLIC-RATE; TROUT SALMO-GAIRDNERI; FRESH-WATER; SEAWATER ACCLIMATION; OXYGEN-CONSUMPTION; RAINBOW-TROUT; KATSUWONUS-PELAMIS; CARBONIC-ANHYDRASE; EURYHALINE TELEOST;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
90
Recensione:
Indirizzi per estratti:
Indirizzo: Brill, R NOAA, Natl Marine Fisheries Serv, 2570 Dole St, Honolulu, HI 96822 USA NOAA 2570 Dole St Honolulu HI USA 96822 t, Honolulu, HI 96822 USA
Citazione:
R. Brill et al., "Gill and intestinal Na+-K+ ATPase activity, and estimated maximal osmoregulatory costs, in three high energy-demand teleosts: yellowfin tuna (Thunnusalbacares), skipjack tuna (Katsuwonus pelamis), and dolphin fish (Coryphaena hippurus)", MARINE BIOL, 138(5), 2001, pp. 935-944

Abstract

We hypothesize that the morpho-physiological adaptations that permit tunasto achieve maximum metabolic rates (MMR) that are more than double those of other active fishes should result in high water and ion flux rates acrossthe gills and concomitant high osmoregulatory costs. The high standard metabolic rates (SMR) of tunas and dolphin fish may, therefore, be due to the elevated rates of energy expenditure for osmoregulation (i.e. teleosts capable of achieving exceptionally high MMR necessarily have SMR). Previous investigators have suggested a link between activity patterns and osmoregulatory costs based on Na+-K+ ATPase activity in the gills of active epipelagic and sluggish deepsea fishes. Based on these observations, we conclude that high-energy-demand fishes (i.e, tunas and dolphin fish) should have exceptionally elevated gill and intestinal Na+-K+ ATPase activity reflecting theirelevated rates of salt and water transfer. To test this idea and estimate osmoregulatory costs, we measured Naf-Kf ATPase activity (V,,,) in homogenates of frozen samples taken from the gills and intestines of skipjack and yellowfin tunas, and the gills of dolphin fish. As a check of our procedures, we made similar measurements using tissues from hybrid red tilapia (Oreochromis mossambicus x O. niloticus). Contrary to our supposition, we found no difference in Na+-K+ ATPase activity per unit mass of gill or intestine in these four species. We estimate the cost of osmoregulation to be at most 9% and 13% of the SMR in skipjack tuna and yellowfin tuna, respectively. Our results, therefore, do not support either of our original suppositions, and the cause(s) underlying the high SMR of tunas and dolphin fish remain unexplained.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/07/20 alle ore 02:34:28