Metabolic responses of the mussels Perna viridis and Perna indica to declining oxygen tension at different salinities |
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| Institution: | 1. N.E.R.C., Institute for Marine Environmental Research, Prospect Place, The Hoe, Plymouth PL1 3DH, Devon, England, Telephone: (0752) 221371;2. School of Marine Sciences, University of Cochin, Cochin 682 016, India;1. School of Engineering, Edith Cowan University, Joondalup, Perth, WA 6027, Australia;2. Department of Civil Engineering, Mirpur University of Science and Technology, Azad Kashmir, Pakistan;3. Department of Civil Engineering, VR Siddhartha Engineering College, Vijayawada, India;1. Unidad de Ciencias del Mar, Facultad de Ciencias, Iguá 4225, 11400, Montevideo, Uruguay;2. Dirección Nacional de Recursos Acuáticos, Constituyente 1497, 11200, Montevideo, Uruguay;1. The Swire Institute of Marine Science and School of Biological Sciences, The University of Hong Kong, Pokfulam, Hong Kong, China;2. State Key Laboratory in Marine Pollution, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China;3. Department of Biology, Hong Kong Baptist University, Waterloo Road, Kowloon, Hong Kong, China;1. Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, Santiago, Chile;2. Facultad de Artes Liberales, Universidad Adolfo Ibáñez, Santiago, Chile;3. Center of Applied Ecology and Sustainability (CAPES-UC), Santiago, Chile |
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| Abstract: | - 1.1. Oxygen uptake and ammonia loss were monitored during responses to reductions of both salinity and oxygen tension (PO2) in the marine mussels Perna viridis and Perna indica from southern India.
- 2.2. The proportional contribution of protein to total catabolic substrates under natural environmental conditions was as much as 96% in P. viridis, relative to only 19% in P. indica.
- 3.3. Normoxic oxygen consumption remained statistically unchanged in P. viridis conditioned to salinities between 32 and 15‰, with no obvious signs of distress. Although equally unaffected at salinities between 32 and 20‰, P. indica showed significantly reduced oxygen uptake following transfer from 32 to 15‰, and had died within the next 7 days.
- 4.4. At salinities greater than 20‰, P. viridis was better able than P. indica to regulate oxygen consumption independent of PO2.
- 5.5. P. indica showed a compensatory increase in oxyregulatory capacity at 15‰. This exceeded unstressed abilities, helping to maintain albeit reduced oxygen uptake throughout wider ranges of PO2.
- 6.6. Different responses recorded in each of these tropical and often intertidal species were in accordance with their natural distributions. Nevertheless, the oxyregulatory capacity in both species was higher than in bivalves from temperate and/or subtidally restricted habitats.
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