Genetic and environmental influences on shape variation in the European sea bass (Dicentrarchus labrax)

Abstract

This paper demonstrates the contribution of both genetic and environmental effects on cultured European sea bass shape. We used the progeny of five populations of sea bass, in a partly diallel design, to investigate the genetics of shape (estimated with geometric morphometrics) in European sea bass. This was done using a common garden experiment with microsatellite markers assignment to parents and populations to avoid confusion between genetic and environmental effects. Additionally, one of the populations was studied over four different aquaculture facilities to investigate the effects of environment on shape. For the first time in this species, shape-related traits were linked with genetic variation. The first relative warp analysis axis clearly differentiated rearing sites, demonstrating that the main shape/weight effects are related to culturing conditions, thereby accounting for ecomorphologically related differences. The second axis strongly differentiated groups by parental origins; there was a good correlation between shape differences and geographic distances between broodstock sampling locations. High heritabilities of axes scores (0.40–0.55) showed high genetic variation for shape within populations. This study shows that variation in shape has a high genetic component in sea bass, both at the population level and within populations

Anthropogenic impacts on the contextual morphological diversification and adaptation of Nile tilapia (Oreochromis niloticus, L. 1758) in East Africa

“…Fish farms had on average lower K values than the wild populations. Over-all, among the Table 2 Description of the landmark points, adopted and modified from, (Costa et al 2010;Lorenz et al 2014;Ndiwa et al 2016;Peligro and Jumawan 2016) Landmark number Location description (Fig. 3a).…”

“…GM is defined as the study of form in two or three dimensional spaces which induce in-depth investigation of morphological modelling in organisms (Bookstein 1982). GM allows the visualization and quantification of morphological differences in individuals represented by deformations of landmarks (Lms) in a coordinate space (Costa et al 2010;Park et al 2013). The arrangement of morphological Lms as data source and shape variation is extracted by Procrustes superimposition (Klingenberg 2011).…”

Morphological Differentiation in the Damselfish Abudefduf saxatilis Along the Mexican Atlantic Coast is Associated with Environmental Factors and High Connectivity

“…While some of these studies have found geographic concordance between morphologic and genetic data (Drew et al 2010) others have uncovered discordance between the measured morphological and genetic traits (Ho et al 2012). Similarly, several investigations on marine fishes have assessed the relationships between morphology and environmental factors; however, studies examining the relative contribution of environmental and genetic variation on morphology across natural populations are scarce (but see Marcil et al 2006;Costa et al 2010), and to our knowledge are lacking for coral reef fishes.…”

Environmental Conditioning of Skeletal Anomalies Typology and Frequency in Gilthead Seabream (Sparus aurata L., 1758) Juveniles

“…The presence of severely deformed reared fish can cause consumers to lose confidence in aquaculture products [15] and reduce the commercial value of the reared lots [10]–[11], [13]–[14], [16]–[24]. Even automatic fillet processing is impaired by the presence of vertebral deformities, thus reducing economic return [25].…”