Food regime modulates physiological processes underlying size differentiation in juvenile intertidal mussels Mytilus galloprovincialis
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Feeding and growth experiments were conducted to test the hypothesis that physiological attributes responsible for size differentiation among bivalves likely vary with environmental conditions. Juvenile mussels (Mytilus galloprovincialis) were collected from an intertidal population in Biscay, Spain (43°24′42,462″N02°56′43,659″W), in January 2007 and 2009. These mussels were maintained in the laboratory under either restrictive or optimal feeding conditions until fast- and slow-growing individuals on each maintenance regime could be identified. After fast- and slow-growing individuals were identified, the components of energy balance responsible for such growth rate differences were measured. The analysis of physiological traits indicates that under optimal food supply conditions, the capacity to ingest and absorb food and associated costs of growth are the main factors underlying growth rate differences. The set of physiological differences changed when size differentiation took place under restrictive food conditions. Higher rates of absorption coupled with reduced rates of metabolism accounted for faster growth in this case, especially under low food rations.
KeywordsClearance Rate Food Ration Growth Group Routine Metabolic Rate Isochrysis Galbana
This study was funded through the project AGL2009-09981 of the Spanish Ministry of Science and Innovation. D.T. was funded by a FPI grant from the Basque Government. Authors are indebted to two referees for valuable comments and suggestions. Finally, Tamayo D. wants to thank, in particular, the invaluable support received from Muguruza C. over the years. Will you marry me?
- Bayne BL, Newell RC (1983) Physiological energetics of marine moluscs. In: Saleudden ASM, Wilbur KM (eds) The Mollusca. Academic Press, New York 4(1): 407–515Google Scholar
- Crisp DJ (1971) Energy flow measurements. In: Holme NA, Mc Inture AD (eds) Methods for the study of marine benthos, (IBP no 16). Blackwell, Oxford, pp 197–323Google Scholar
- David P, Delay B, Berthou P, Jarne P (1995) Alternative models for allozyme-associated heterosis in the marine bivalve Spisula ovalis. Genetics 139:1719–1726Google Scholar
- Garton DW, Koehn RK, Scott TM (1984) Multiple-locus heterozygosity and the physiological energetics of growth in the coot clam, Munilia lateralis, from a natural population. Genetics 108:445–455Google Scholar
- Koehn RK, Diehl WJ, Scott TM (1988) The differential contribution by individual enzymes of glycolysis and protein catabolism to the relationship between heterozygosity and growth rate in the coot clam, Mulinia lateralis. Genetics 118:121–130Google Scholar
- Launey S, Hedgecock D (2001) High genetic load in the Pacific oyster Crassostrea gigas. Genetics 159:255–265Google Scholar