Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 566, Issue -, Pages 260-268Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2016.05.019
Keywords
Oxidative stress; Salinity; Seawater acidification; Ruditapes decussatus; R. philippinarum
Categories
Funding
- National Funds through the Portuguese Science Foundation (FCT) [SFRH/BD/86356/2012, SFRH/BPD/92258/2013]
- FSE
- Programa Operacional Capital Humano (POCH) e da Uniao Europeia
- CESAM [UID/AMB/50017]
- FCT/MEC through national funds
- FEDER
- Fundação para a Ciência e a Tecnologia [SFRH/BD/86356/2012] Funding Source: FCT
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By the end of year 2100 physiological and biochemical performance of aquatic organisms are expected to become strongly affected by salinity and pH shifts, which in turn may favor the conditions for introduced species to invade new ecosystem areas. Given this, we evaluated the effects of salinity and pH changes in native Ruditapes decussatus and introduced Ruditapes philippinarum clams, by measuring different biomarkers related to oxidative stress, metabolic activity and osmoregulation capacity. Results showed that extreme salinities induced mortality in both species, while all clams survived under low pH (7.3). Both species mobilized glycogen as a source of energy towards cells protection mechanisms under extreme salinities. The native species presented higher lipid peroxidation levels while the introduced species was able to prevent oxidative damages through the induction of antioxidant enzymes at most extreme salinities. R. philippinarum also induced CA activity to balance the ion homeostasis at extreme salinities. In contrast, low pH induced oxidative damages, an increase of antioxidant (catalase), detoxification (glutathione S-transferases) and osmoregulation (carbonic anhydrase) mechanisms in R. philippinarum compared to the native clams. Overall, salinity and pH changes can alter physiological and biochemical status of native and introduced clam species. (C) 2016 Elsevier B.V. All rights reserved.
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