Heritability of Boldness and Hypoxia Avoidance in European Seabass, Dicentrarchus labraxReportar como inadecuado

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To understand the genetic basis of coping style in European seabass, fish from a full factorial mating 10 females x 50 males were reared in common garden and individually tagged. Individuals coping style was characterized through behavior tests at four different ages, categorizing fish into proactive or reactive: a hypoxia avoidance test at 255 days post hatching, dph and 3 risk-taking tests at 276, 286 and 304 dph. We observed significant heritability of the coping style, higher for the average of risk-taking scores h2 = 0.45 ± 0.14 than for the hypoxia avoidance test h2 = 0.19 ± 0.10. The genetic correlations between the three risk-taking scores were very high rA = 0.96–0.99 showing that although their repeatability was moderately high rP = 0.64–0.72, successive risk-taking tests evaluated the same genetic variation. A mild genetic correlation between the results of the hypoxia avoidance test and the average of risk-taking scores 0.45 ± 0.27 suggested that hypoxia avoidance and risk-taking tests do not address exactly the same behavioral and physiological responses. Genetic correlations between weight and risk taking traits showed negative values whatever the test used in our population i.e. reactive individual weights were larger. The results of this quantitative genetic analysis suggest a potential for the development of selection programs based on coping styles that could increase seabass welfare without altering growth performances. Overall, it also contributes to a better understanding of the origin and the significance of individual behavioral differences.

Autor: Sébastien Ferrari , Khaled Horri , François Allal, Alain Vergnet, David Benhaim, Marc Vandeputte, Béatrice Chatain, Marie-Laur

Fuente: http://plos.srce.hr/


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