Establishing the thermal threshold of the tropical mussel Perna viridis in the face of global warming |
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| Authors: | BPL Goh CH Lai |
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| Institution: | National Institute of Education, Nanyang Technological University, 1 Nanyang Walk, Singapore 637616, Singapore |
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| 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. |
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| Keywords: | Thermal limit Perna viridis Ecotoxicology NRRT FRAP HSP70 |
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