Please use this identifier to cite or link to this item: https://biore.bio.bg.ac.rs/handle/123456789/1651
Title: Oxidative cost of interspecific hybridization: A case study of two Triturus species and their hybrids
Authors: Prokić, Marko D.
Despotović, Svetlana G.
Vučić, Tijana Z. 
Petrović, Tamara G.
Gavrić, Jelena P.
Gavrilović, Branka R.
Radovanović, Tijana B.
Saičić, Zorica S.
Keywords: Anti-oxidative defence system;Crested newts;Fitness;Integration;Oxidative stress
Issue Date: 1-Oct-2018
Rank: M21
Project: Molecular and physiological biomonitoring of aerobic organisms based on the determination of biochemical biomarkers of oxidative stress 
Diversity of the amphibians and reptiles on the Balkan Peninsula: evolutionary and conservation aspects 
Journal: Journal of Experimental Biology
Abstract: 
© 2018. Published by The Company of Biologists Ltd. Oxidative stress has most recently been suggested as one of the possible mechanisms responsible for reduced fitness of hybrids. To explore possible oxidative cost of hybridization, we examined anti-oxidant defence system parameters (superoxide dismutase, catalase, glutathione peroxidase, glutathione Stransferase, glutathione reductase, glutathione, SH groups), their interconnectedness (index of integration) and levels of oxidative damage [concentrations of lipid peroxides, TBARS (thiobarbituric acid reactive substances)] in laboratory-reared newt species, Triturus macedonicus and T. ivanbureschi, and their hybrid. Our results showed that parental species differed in anti-oxidant defence system parameters, but not in the levels of integration of the whole system and oxidative damage. Individuals of T. ivanbureschi had higher activities of superoxide dismutase, glutathione S-transferase and concentrations of glutathione. Hybrid individuals of crested newts displayed higher levels of the anti-oxidant defence system (higher superoxide dismutase, catalase, glutathione peroxidase activities and concentrations of SH groups), and a lower overall correlation of anti-oxidant system (lower index of integration) in comparison with both parental species, suggesting that they may possess a less efficient anti-oxidant defence system and a higher investment in maintaining oxidative balance. The higher investment in the anti-oxidant system could divert limited resources away from other functions and affect further hybrid fitness. The presented findings contribute to a better understanding of the anti-oxidant defence system of crested newts and their interspecies differences, and support the hypothesis that oxidative stress is one of the costs of interspecific hybridization.
URI: https://biore.bio.bg.ac.rs/handle/123456789/1651
ISSN: 0022-0949
DOI: 10.1242/jeb.182055
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