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Marine Ecology Progress Series

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MEPS 565:67-77 (2017)  -  DOI:

Ocean acidification decreases mussel byssal attachment strength and induces molecular byssal responses

Xinguo Zhao1, Cheng Guo1, Yu Han1, Zhumei Che2, Yichen Wang1, Xiying Wang1, Xueliang Chai3, Hongxi Wu3, Guangxu Liu1,* 

1College of Animal Sciences, Zhejiang University, Hangzhou 310058, PR China
2Marine Monitoring and Forecasting Center of Zhejiang, Hangzhou 310007, PR China
3Zhejiang Mariculture Research Institute, Wenzhou 325000, PR China
*Corresponding author:

ABSTRACT: Ocean acidification (OA) is a term describing the uptake of CO2 from the atmosphere, decreasing seawater pH and altering carbonate chemistry. Mussels are an ecologically and economically important taxon that attach to solid surfaces via the byssus. To date, little is known about the effects of OA on mussel byssal attachment and the underlying molecular byssal responses. This study demonstrated that after 1 wk of exposure to acidified seawater, both mechanical properties (such as strength and extensibility) and the numbers of byssal threads produced by Mytilus coruscus were significantly reduced, leading to a 60 to 65% decrease in mussel byssal attachment strength. Real-time PCR results suggested that OA also altered the expression of genes encoding the proximal thread matrix protein (PTMP), precursor collagen proteins (preCOL-P, -NG and -D) and mussel foot proteins (mfp-1, -2, -3, -4, -5 and -6). The down-regulation of some specific byssal proteins may be one of the reasons for the weakened mechanical properties of individual byssal threads under OA conditions. In contrast, the up-regulation of some other specific byssal proteins may be adaptive responses to minimize the adverse effect of OA on byssal attachment. OA may weaken mussel byssal attachment by reducing the production and mechanical properties of byssal threads and by inducing byssal molecular responses. The weakened byssal attachment induced by OA therefore could pose a substantial threat to both mussel aquaculture and mussel-bed ecosystems.

KEY WORDS: Elevated pCO2 · Mytilus coruscus · Byssal thread · Gene expression · Mechanical properties

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Cite this article as: Zhao X, Guo C, Han Y, Che Z and others (2017) Ocean acidification decreases mussel byssal attachment strength and induces molecular byssal responses. Mar Ecol Prog Ser 565:67-77.

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