Age-and sex-dependent changes in morphometric and metabolic variables in the long-lived freshwater mussel Diplodon chilensis.

YUSSEPPONE M.S.; LOMOVASKY B.J.; LUQUET C.M.; RÍOS DE MOLINA M.C.; ROCCHETTA I.

MARINE AND FRESHWATER RESEARCH

CSIRO PUBLISHING

Lugar: Collingwood; Año: 2015 vol. 67 p. 17 - 25

1323-1650

Markers of oxidative stress and biochemical composition were investigated in digestive gland (DG) and gonad tissues in the freshwater mussel Diplodon chilensis, as well as morphometric variables in relation to chronological age and sex. Individual growth followed a von Bertalanffy growth model (VBGM). Superoxide dismutase (SOD) activity, glutathione (GSH) level and oxidative damage to proteins, remain constant through life in both tissues, while catalase (CAT) and GST activities and lipid peroxidation decrease until 24 - 27 years, to remain fairly stable (mostly in gonads) or increase slowly (mostly in DG) afterwards. The timing of these age-related changes is coincident with the age estimated (28 years) from the lower Confidence interval (CI) for L∞ (69.97 mm), at which the bivalves would reach their minimum growth rate. D. chilensis qualifies as environmental mitigator for water and sediment clearance. Individuals near the age of minimum growth (20-30 y) would be better suited for bioremediation strategies compared to younger individuals (more sensitive) or to older ones, which are less active and show increasing lipid peroxidation with age. Applying D. chilensis of this age class in sewage-polluted lake shores, in parallel with efforts to improve sewage treatment plants, would ensure an enhancement of the water and sediment cleansing for several decades.