Drivers of plasticity in freeze tolerance in the intertidal mussel M ytilus trossulus.

The Journal of Experimental Biology
Jessica R KennedyKatie E Marshall

Abstract

Freezing is an extreme stress to living cells, and so freeze-tolerant animals often accumulate protective molecules (termed cryoprotectants) to prevent the cellular damage caused by freezing. The bay mussel, Mytilus trossulus, is an ecologically important intertidal invertebrate that can survive freezing. Although much is known about the biochemical correlates of freeze tolerance in insects and vertebrates, the cryoprotectants that are used by intertidal invertebrates are not well characterized. Previous work has proposed two possible groups of low-molecular weight cryoprotectants in intertidal invertebrates: osmolytes and anaerobic byproducts. In our study, we examined which group of candidate cryoprotectants correlate with plasticity in freeze tolerance in mussels using 1H NMR metabolomics. We found that the freeze tolerance of M. trossulus varies on a seasonal basis, along an intertidal shore-level gradient, and with changing salinity. Acclimation to increased salinity (30 ppt compared with 15 ppt) increased freeze tolerance, and mussels were significantly more freeze tolerant during the winter. Mussel freeze tolerance also increased with increasing shore level. There was limited evidence that anaerobic byproduct accumulatio...Continue Reading

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Citations

Oct 30, 2021·Biological Reviews of the Cambridge Philosophical Society·Yun-Wei DongGeorge N Somero

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