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First published online February 29, 2008
Journal of Experimental Biology 211, 969-977 (2008)
Published by The Company of Biologists 2008
doi: 10.1242/jeb.014639
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Physiological and biochemical traits correlate with differences in growth rate and temperature adaptation among groups of the eastern oyster Crassostrea virginica

Fabrice Pernet1,*, Réjean Tremblay2, Iften Redjah1,2, Jean-Marie Sévigny3 and Chantal Gionet1

1 Institut de Recherche sur les Zones Côtières, 232B rue de l'Église, Shippagan, Nouveau-Brunswick, Canada, E8S 1J2
2 Institut des Sciences de la Mer, 310 allée des Ursulines, Rimouski, Québec, Canada, G5L 3A1
3 Institut Maurice-Lamontagne, Pêches & Océans Canada, Mont-Joli, Québec, Canada, G5H 3Z4


Figure 1
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  		Fig. 1. (A) Schematic diagram of the split–split plot experimental design. (B) Experimental protocol for the temperature experiment. Stars indicate dates of physiological measurements and lipid sampling.

 

Figure 2
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  		Fig. 2. (A) Scope for growth as a function of oyster origin. (B) Clearance rate of oysters as a function of temperature x origin. The inset shows clearance rate as a function of oyster origin only (main effect). (C) Oxygen consumption rate of oysters as a function of temperature (left) and date (right). Oysters were collected in the field or produced in the hatchery. Five males and 20 females were mated to produce animals in the pooled group (Pool) whereas Fx represents full-sib families. Data are means ± s.e.m., n=3 aquaria. Data from different temperatures and times were pooled together when these effects were not significant. Different letters indicate significant differences.

 

Figure 3
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  		Fig. 3. Unsaturation index of polar lipids in oysters as a function of (A) their origin and (B) time x temperature. Oysters were collected in the field or produced in the hatchery. Five males and 20 females were mated to produce animals in the pooled group (Pool) whereas Fx represents full-sib families. Data are means ± s.e.m., n=3 aquaria. Different letters indicate significant differences.

 

Figure 4
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  		Fig. 4. Docosahexaenoic acid (22:6n-3; mol %) in polar lipids as a function of (A) temperature x oyster origin and (B) time x temperature. (C) Eicosapentaenoic acid (20:5n-3; mol %) in the polar lipids as a function of time x temperature x oyster origin. Oysters were collected in the field or produced in the hatchery. Five males and 20 females were mated to produce animals in the pooled group (Pool) whereas Fx represents full-sib families. Data are means (± s.e.m. for B but omitted for clarity in A and C), n=3 aquaria. Different letters indicate significant differences.

 




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