Are developmental shifts the main driver of phenotypic evolution in Diplodus spp. (Perciformes: Sparidae)?

Background: Sparid fishes of the genus Diplodus show a complex life history. Juveniles have adaptations well suited to life in the water column. When fishes recruit into the adult population individuals develop a radically differentiated shape that reflect their adaptation to the new benthic environment typical of the adult.

By using a geometric morphometric approach, we investigated the pattern of shape variation across ontogenetic stages that span from early settlement to the adult stage in four species of the genus Diplodus. Landmarks were collected on the whole body of fishes to quantify the phenotypic variation along two well defined life stages, i.e. juvenile and adult. A comparative analysis of ontogenetic trajectories was performed to assess the presence of divergence in the developmental pattern. Subsequently, we investigated the patterns of integration and modularity as proxy of the alteration of the developmental processes. This allowed to have an insight in morphological...