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Mar Pollut Bull. 2014 Aug 30;85(2):325-31. doi: 10.1016/j.marpolbul.2013.10.041. Epub 2013 Nov 14.

Establishing the thermal threshold of the tropical mussel Perna viridis in the face of global warming.

Author information

1
National Institute of Education, Nanyang Technological University, 1 Nanyang Walk, Singapore 637616, Singapore. Electronic address: beverly.goh@nie.edu.sg.
2
National Institute of Education, Nanyang Technological University, 1 Nanyang Walk, Singapore 637616, Singapore.

Abstract

With increasing recognition that maximum oxygen demand is the unifying limit in tolerance, the first line of thermal sensitivity is, as a corollary, due to capacity limitations at a high level of organisational complexity before individual, molecular or membrane functions become disturbed. In this study the tropical mussel Perna viridis were subjected to temperature change of 0.4 °C per hour from ambient to 8-36 °C. By comparing thermal mortality against biochemical indices (hsp70, gluthathione), physiological indices (glycogen, FRAP, NRRT) and behavioural indices (clearance rate), a hierarchy of thermal tolerance was therein elucidated, ranging from systemic to cellular to molecular levels. Generally, while biochemical indices indicated a stress signal much earlier than the more integrated behavioural indices, failure of the latter (indicating a tolerance limit and transition to pejus state) occurred much earlier than the other indices tending towards thermal extremities at both ends of the thermal spectrum.

KEYWORDS:

Ecotoxicology; FRAP; HSP70; NRRT; Perna viridis; Thermal limit

PMID:
24239310
DOI:
10.1016/j.marpolbul.2013.10.041
[Indexed for MEDLINE]
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