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Immune suppression of the echinodermAsterias rubens(L.) following long-term ocean acidification

Authors
Journal
Aquatic Toxicology
0166-445X
Publisher
Elsevier
Publication Date
Volume
103
Identifiers
DOI: 10.1016/j.aquatox.2011.03.001
Keywords
  • Ocean Acidification
  • Co2
  • Immunity
  • Stress Indicators
  • Marine Invertebrates

Abstract

Abstract We compared effects of exposure to predict near-future (2100) ocean acidification (OA; pH 7.7) and normal seawater (Control; pH 8.1) on immune and stress responses in the adult sea star Asterias rubens. Analyses were made after one week and after six months of continuous exposure. Following one week exposure to acidified water, the pH of coelomic fluid was significantly reduced. Levels of the chaperon Hsp70 were elevated while key cellular players in immunity, coelomocytes, were reduced by approximately 50%. Following long-term exposure (six months) levels of Hsp70 returned to control values, whereas immunity was further impaired, evidenced by the reduced phagocytic capacity of coelomocytes and inhibited activation of p38 MAP-kinase. Such impacts of reduced seawater pH may have serious consequences for resistance to pathogens in a future acidified ocean.

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