Tolerance Difference Between Two Species (Perna Viridis And Vasticardium Cf. Flavum) Under Heat And Hypoxia Stress

Abstract

The environmental shifting is one major stress to sessile organisms such Bivalves. Two of most vital environmental parameters are temperature and oxygen availability. High water temperature and low oxygen concentration leading to hypoxia conditions will affecting the performance of Perna viridis and Vasticardium cf. flavum. Hypoxia (DO 0,5 mg/l) significantly causing stress to both species (pperna < 0,01; pvasticardium < 0,01), and P. viridis has higher tolerance to hypoxia compare to V. cf. flavum (p < 0,05). Heat stress (34°C) also significantly causing stress to both (pperna < 0,01; pvasticardium < 0,05), though the values of their survivorship was not differ significantly when they were compared (p > 0,05). Based on the result, can be concluded that even both factors are stressors for each species, P. viridis has better tolerance to hypoxia than V. cf. flavum; as in heat stress, both species undergo the same impact in attempt to survive.