Hypoxia tolerance and antioxidant defense system of juvenile jumbo squids in oxygen minimum zones

Jumbo squid (Dosidicus gigas) is a large oceanic squid endemic off the Eastern Tropical Pacific that undertakes diel vertical migrations into mesopelagic oxygen minimum zones. One of the expected physiological effects of such migration is the generation of reactive oxygen species (ROS) at the surfac...

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Bibliographic Details
Published in:Deep-sea research. Part II, Topical studies in oceanography Topical studies in oceanography, 2013-10, Vol.95, p.209-217
Main Authors: Trübenbach, Katja, Teixeira, Tatiana, Diniz, Mário, Rosa, Rui
Format: Article
Language:English
Subjects:
Antioxidant defense system
Dosidicus gigas
Hypoxia
Jumbo squid
Oxidative stress
Oxygen minimum zones
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Summary:Jumbo squid (Dosidicus gigas) is a large oceanic squid endemic off the Eastern Tropical Pacific that undertakes diel vertical migrations into mesopelagic oxygen minimum zones. One of the expected physiological effects of such migration is the generation of reactive oxygen species (ROS) at the surface, promoted by the transition between hypoxia and reoxygenation states. The aim of this study was to investigate the energy expenditure rates and the antioxidant stress strategies of juvenile D. gigas under normoxia and hypoxia, namely by quantifying oxygen consumption rates, antioxidant enzyme activities [including superoxide dismutase (SOD), catalase (CAT) and glutathione-S-transferase (GST)], heat shock protein expression (Hsp70/Hsc70), and lipid peroxidation [malondialdehyde (MDA) levels]. A high significant decrease (68%) in squid’s metabolic rates was observed during hypoxia (p
ISSN:0967-0645
1879-0100
DOI:10.1016/j.dsr2.2012.10.001