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Energy balance as a determinant of two-phase growth in cephalopods


Grist, EPM and Jackson, GD, Energy balance as a determinant of two-phase growth in cephalopods, Marine and Freshwater Research, 55, (4) pp. 395-401. ISSN 1323-1650 (2004) [Refereed Article]

DOI: doi:10.1071/MF03154


Many cephalopods exhibit early exponential growth, which abruptly shifts to a much slower rate. Using a simple model of the energy balance between intake from food and expenditure in growth plus metabolism, we consider how the two-phase growth pattern may be explained in terms of energy conservation. We determine the post-hatch size and age at which exponential growth would be expected to terminate. The model is tested with laboratory hatchling data obtained for the giant Australian cuttlefish Sepia apama. Together with growth data obtained for a related species, Sepia officinalis, model projections for critical transition size and age interestingly suggest that the metabolism of S. apama in the natural habitat may be three to four times higher than in captivity. A sensitivity analysis indicates that the critical transition size is in general more sensitive than critical transition time to any invoked changes in metabolic rate.

Item Details

Item Type:Refereed Article
Research Division:Mathematical Sciences
Research Group:Applied mathematics
Research Field:Biological mathematics
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Natural hazards
Objective Field:Natural hazards not elsewhere classified
UTAS Author:Jackson, GD (Dr George Jackson)
ID Code:32346
Year Published:2004
Web of Science® Times Cited:20
Deposited By:IASOS
Deposited On:2004-08-01
Last Modified:2005-06-06

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