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First published online January 18, 2008
Journal of Experimental Biology 211, 391-400 (2008)
Published by The Company of Biologists 2008
doi: 10.1242/jeb.013169
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Scaling of metabolism in Helix aspersa snails: changes through ontogeny and response to selection for increased size

Marcin Czarnoleski1,*, Jan Kozlowski1, Guillaume Dumiot2, Jean-Claude Bonnet3, Jacques Mallard4 and Mathilde Dupont-Nivet2

1 Institute of Environmental Sciences, Jagiellonian University, Gronostajowa 7, 30-387 Kraków, Poland
2 INRA, UR 544, Unité de Génétique des Poissons, F-78350 Jouy en Josas, France
3 INRA, Unité Héliciculture, BP 52, F-17700 Surgcres, France
4 ENSAR, Direction Scientifique, F-35042 Rennes Cedex, France


Figure 1
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  		Fig. 1. Logistic growth curves of Helix aspersa snails from control and size-selected lines, based on values of averaged family-specific growth curve parameters (see Table 1). Symbols denote family-specific mean size of snails at a given age.

 

Figure 2
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  		Fig. 2. Food consumption (A), growth rates (B) and growth efficiency (C) of control and size-selected Helix aspersa snails in the fast-growth ontogenetic phase (exponential-like part of growth curve; see Fig. 1). Growth efficiency is the ratio of the average increase of snail whole mass to food consumption. Symbols denote family-specific mean values calculated from data for 3-week intervals. Whisker charts show least-square means with 95% confidence intervals estimated at mean value of body mass, with the aid of GLM from Table 2.

 

Figure 3
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  		Fig. 3. Comparison of size-scaling of oxygen consumption (A–C) and shell mass (D–F) of control and size-selected Helix aspersa snails in the fast- and slow-growth phases of ontogeny. Growth rate accelerates with age in the fast-growth phase; it decelerates with age in the slow-growth phase. Symbols denote measures of individual snails.

 

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© The Company of Biologists Ltd 2008