LUQUET carlos Marcelo
Does shell shape variation play a role in conservation of the long-lived freshwater bivalve Diplodon chilensis (Bivalvia, Hyriidae)?
YUSSEPPONE, MARIA S.; MÁRQUEZ, FEDERICO; LUQUET, CARLOS M.; BREY, THOMAS; RÍOS DE MOLINA, MARIA C.; ROCCHETTA, IARA
JOHN WILEY & SONS INC
Lugar: New York; Año: 2018 vol. 11
Freshwater bivalves of the order Unionoida display an uncommon phenotypic plasticity with highinterpopulation and intrapopulation morphological variability, which could be advantageous forcoping with habitat modifications. However, unionoids have suffered a marked populationdecline in different parts of the world in the last decades. A decline in some populations of theSouth American long‐lived freshwater mussel Diplodon chilensis as a consequence of habitatdeterioration has recently been recorded. Ontogenetic allometry and shape variation in shells ofD. chilensis from 2 different sites, Paimun lake and Chimehuin river, North Patagonia, Argentina,have been studied. For these purposes, geometric morphometric methods were used. Shell shapeshows differences between sites, which the shells from Chimehuin river show less intrapopulationvariability; are more elongated, with the anterior part extended upwards and the posterior partdownwards; and show a steeper anterior curvature at the umbo compared to those from Paimúnlake. These characteristics make shell shape more streamlined to withstand river current.Furthermore, the extended posterior‐ventral part in river shells coincides with higher foot weightthat would improve anchoring to the river rocky?sandy substrate. River shells present a boundedeco‐morphotype whereas the higher variability of lake shells includes the ?river eco‐morphotype.?Growth is allometric throughout life in both sites and is not sex‐dependent. The success of riverrepopulation programmes using mussels from lake populations may be increased by transplantingselected individuals that show ?river eco‐morphotype.?