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MEPS prepress abstract   -  DOI:

Seasonal metabolic and oxidative stress responses of commercially important invertebrate species—correlation with their habitat

Konstantinos Feidantsis*, Basile Michaelidis, Dionysios Ε. Raitsos,Dimitris Vafidis

*Corresponding author:

ABSTRACT: Habitat conditions play a crucial role in food acquisition, energetic and physiological performance of marine organisms during seasonal changes. However, same species’ populations exhibiting wide range of distribution might face physiological constraints driven by their habitats’ oceanographic and climatological characteristics. In climate change’s context, biochemical and metabolic data might contribute largely in identifying marine areas, where inhabiting organisms are more or less physiologically constrained. As a first step in identifying such marine areas in Greek coasts, we studied the seasonal metabolic and antioxidant responses of blue crab Callinectes sapidus, cuttlefish Sepia officinalis, sea cucumber Holothuria tubulosa and clam Venus verrucosa, collected from 3 different Greek gulfs: Thermaikos, Pagasitikos and Vistonikos. Seasonal analysis of metabolic responses was based on the activity of the following intermediary metabolism’s enzymes: lactate dehydrogenase (L-LDH), octopine dehydrogenase (ODH), β-hydroxyacyl-CoA dehydrogenase (HOAD) and citrate synthase (CS). Antioxidant responses were based on the activities of the following enzymes: superoxide dismutase (SOD), glutathione reductase (GR) and catalase, and on lipid peroxidation estimation. Blue crab and clam exhibited the most significant seasonal changes compared to the sea cucumber and cuttlefish, which exhibited no changes. Intermediary metabolism enzymatic activity of blue crab and clam decreased and antioxidant enzymatic activity increased during summer. Higher activity levels for all examined species were observed in Pagasitikos, and lower in Vistonikos gulf, indicating corresponding oxidative stress. These results are correlated with the habitats’ spatial oceanographic conditions and are discussed based on future projections of global warming in the Mediterranean Sea.