In the present study the model isopod, Cyathura carinata were exposed to four pH(NIST) treatments (control: 7.9; 7.5, 7, 6.5) in order to determine the tolerance and pH threshold value this estuarine species with stand under future acidification scenarios. Seawater acidification significantly affected the lifespan of C. carinata, where population density was remarkably reduced at the lowest pH treatment. The longevity, survivorship and swimming activity (related to the acquisition of energy) of these isopods decreased with decreasing pH. Furthermore, to determine the possible metabolic plasticity of this species, the swimming activity, the Na+/K + -ATPase activity (relevant for osmoregulation process), and the RNA: DNA ratio (an indicator of fitness) were measure from two populations of C. carinata, one inhabiting a stable environment (pH(NIST) 7.5-8.0) and one inhabiting a fluctuating pCO(2) regimes (pH 3.3-8.5) subjected to three pH treatments (7.9, 7.0 and 6.5). The population from high fluctuating pCO(2) conditions showed capacity to withstand to pH 6.5, as well as higher longevity and metabolic plasticity, when compared with the population from the habitat with slight pCO(2) variation. These results indicate that Cyathura population from stable environments could be vulnerable to ocean acidification because it could trigger detrimental effects on its survival energy budget, and growth. However, ocean acidification has limited effect on the energy budget and survival of C. carinata population from highly variable habitats, suggesting that they are able to cope with the elevated energy demand. The difference showed between populations is likely an indication of genetic differentiation in tolerance to ocean acidification, possibly attributable to local adaptations, which could provide the raw material necessary for adaptation to future conditions. In addition, our results suggest that when assessing marine crustacean responses to changing environments on a global scale, variability in population and metabolic responses need to be considered. (C) 2019 Elsevier B.V. All rights reserved.
1.Univ Seville, Fac Biol, Dept Zool, Av Reina Mercedes S-N, E-41012 Seville, Spain 2.Univ Cadiz, Fac Ciencias Mar & Ambientales, UNESCO, UNITWIN UNICOP, PG Rio San Pedro S-N, Cadiz 11510, Spain 3.Univ Cantabria, Dept Quim & Ingn Proc & Recursos ETSIIT, Green Engn Resources Grp GER, Cantabria, Spain 4.Univ Jaen, Ctr Estudios Avanzados Ciencias Tierra, Dept Biol Anim Vegetal & Ecol, Jaen, Spain 5.Fac Expt Sci, Dept Earth Sci, Avda Fuerzas Armadas S-N, Huelva 21071, Spain 6.Fac Expt Sci, Res Ctr Nat Resources Hlth & Environm, Avda Fuerzas Armadas S-N, Huelva 21071, Spain
Recommended Citation:
Conradi, M.,Sanchez-Moyano, J. E.,Bhuiyan, M. K. A.,et al. Intraspecific variation in the response of the estuarine European isopod Cyathura carinata (Kroyer, 1847) to ocean acidification[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2019-01-01,683:134-145