The physiological energetics of growth in the clam, Mulinia lateralis: an explanation for the relationship between growth rate and individual heterozygosity
Garton, D.W.; Koehn, R.K.; Scott, T.M. (1985). The physiological energetics of growth in the clam, Mulinia lateralis: an explanation for the relationship between growth rate and individual heterozygosity, in: Gibbs, P.E. (Ed.) Proceedings of the 19th European Marine Biology Symposium, Plymouth, Devon, UK, 16-21 September 1984. pp. 455-464 In: Gibbs, P.E. (Ed.) (1985). Proceedings of the Nineteenth European Marine Biology Symposium, Plymouth, Devon, UK, 16-21 September 1984. European Marine Biology Symposia, 19. Cambridge University Press: Cambridge. ISBN 0-521-30294-3. 541 pp., more In: European Marine Biology Symposia., more |
| Authors | | Top | - Garton, D.W.
- Koehn, R.K.
- Scott, T.M.
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| Abstract | The contributions of feeding rate, metabolic costs of feeding and metabolic efficiency to the relationship between multiple locus heterozygosity and growth rate were examined in the clam, Mulinia lateralis (Say). Growth rates, routine oxygen consumption, ammonia excretion and clearance rates were measured for clams acclimated to 23°C and 26‰S. Metabolic losses and growth were both standardized with respect to clearance rate. Heterozygosity was determined at six polymorphic enzyme loci. Growth rate increased with heterozygosity; this was associated with a negative relationship between routine metabolic costs and heterozygosity. Reduction of routine metabolic costs explained 60% of this increased growth. After standardizing for variation in feeding rate, standard metabolic efficiency explained 97% of the increased growth associated with heterozygosity. Reduction of standard metabolic costs is an important factor in explaining the relationship, observed in many species, between growth and heterozygosity. In addition, a physiological model is developed describing the possible relationships between metabolic efficiency, 'scope for activity' and growth rate. |
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