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Titolo:
Physiological (antioxidant) responses of estuarine fishes to variability in dissolved oxygen
Autore:
Ross, SW; Dalton, DA; Kramer, S; Christensen, BL;
Indirizzi:
NC Div Coastal Management, N Carolina Natl Estuarine Res Reserve, Wilmington, NC 28409 USA NC Div Coastal Management Wilmington NC USA 28409 ilmington, NC 28409 USA Reed Coll, Dept Biol, Portland, OR 97202 USA Reed Coll Portland OR USA 97202 d Coll, Dept Biol, Portland, OR 97202 USA Elkhom Slough Natl Estuarine Res Reserve, Watsonville, CA 95076 USA ElkhomSlough Natl Estuarine Res Reserve Watsonville CA USA 95076 076 USA
Titolo Testata:
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY C-TOXICOLOGY & PHARMACOLOGY
fascicolo: 3, volume: 130, anno: 2001,
pagine: 289 - 303
SICI:
1532-0456(200111)130:3<289:P(ROEF>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOYBEAN ROOT-NODULES; FRESH-WATER FISH; GLUTATHIONE-PEROXIDASE; SUPEROXIDE-DISMUTASE; ENZYMES; HYPOXIA; METABOLISM; ASCORBATE; CATALASE; BEHAVIOR;
Keywords:
spot; pinfish; longjaw mudsucker; staghorn sculpin; National Estuarine Research Reserves; North Carolina; California;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
50
Recensione:
Indirizzi per estratti:
Indirizzo: Ross, SW NC Div Coastal Management, N Carolina Natl Estuarine Res Reserve,8600 Marvin Moss Ln, Wilmington, NC 28409 USA NC Div Coastal Management 8600 Marvin Moss Ln Wilmington NC USA 28409
Citazione:
S.W. Ross et al., "Physiological (antioxidant) responses of estuarine fishes to variability in dissolved oxygen", COMP BIOC C, 130(3), 2001, pp. 289-303

Abstract

Cycles of dissolved oxygen (DO) in estuaries can range from anoxia to various levels of supersaturation (200-300%) over short time periods. Aerobic metabolism causes formation of damaging reactive oxygen species (ROS), a process exacerbated by high or low DO. Fish can generate physiological defenses (e.g. antioxidant enzymes) against ROS, however, there are little data tying this to environmental conditions. We investigated physiological defenses generated by estuarine fishes in response to high DO and various DO cycles. We hypothesized that chemical defenses and/or oxidative damage are related to patterns of DO supersaturation. Specific activities of antioxidants in fish tissues should be positively correlated with increasing levels of DO, if high DO levels are physiologically stressful. We caged common benthic fishes (longjaw mudsucker, Gillichthys mirabilis, and staghorn sculpin, Leptocottus armatus, in CA and spot, Leiostomus xanthurus and pinfish, Lagodonrhomboides, in NC) during summer 1998 in two estuarine sites in Southern North Carolina and two in central California. At each site a water quality meter measured bottom DO, salinity, temperature, depth, pH and turbidity at 30 min intervals throughout the study. These sites exhibited a wide varietyof dissolved oxygen patterns. After 2 weeks in the cages, fish gills and livers were analyzed for antioxidant enzymes (glutathione peroxidase, catalase and superoxide dismutase) and the metabolite glutathione. All fish exhibited antioxidant enzyme activity. There was a significant site-dependent effect on all enzyme activities at the NC sites, with the most activity at the site with the highest DO cycling and the most DO supersaturation. There was a trend towards higher enzyme activities under high DO levels at the CA sites. (C) 2001 Elsevier Science Inc. All rights reserved.

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Documento generato il 06/06/20 alle ore 11:07:14