INIBIOMA   20415
INSTITUTO DE INVESTIGACIONES EN BIODIVERSIDAD Y MEDIOAMBIENTE
Unidad Ejecutora - UE
artículos
Título:
Growth, abundance, morphometric and metabolic parameters of three populations of Diplodon chilensis subject to different levels of natural and anthropogenic organic matter input in a glaciar lake of North Patagonia
Autor/es:
IARA ROCCHETA; BETINA J. LOMOVASKI; MARIA S. YUSSEPPONE ; SEBASTIÁN E. SABATINI; FLAVIA BIECZYINSKI ; MARÍA DEL CARMEN RÍOS DE MOLINA ; CARLOS M. LUQUET
Revista:
LIMNOLOGICA
Editorial:
ELSEVIER GMBH
Referencias:
Año: 2014 vol. 44 p. 72 - 80
ISSN:
0075-9511
Resumen:
Three populations of Diplodon chilensis (Hiridae, Bivalvia) from North Patagonia (Lacar lake, Argentina) have been studied to determine how natural and anthropogenic organic matter provided by the forest or urban discharges may influence their growth, density and morphometric and metabolic parameters. These populations have been exposed to different levels of natural organic matter, due different annual precipitation rates (Yuco and Nonthué), or to increased organic matter associated to urban discharges (SMA). In Nonthué, a dense neighboring forest provides higher quantities of vegetal detritus compared to Yuco, while in SMA sewage discharges supplement the natural OM input. Our results show that size distribution was affected by increased OM, independently of its natural or anthropogenic origin. The modal shell length interval for both SMA and Nonthué was around 70 mm, the double compared to Yuco (35 mm), but only SMA bivalves showed a higher growth rate and a lower maximum age and density. No individuals under 7 years old were found in this population. Additionally, we have detected an increase in lipid peroxidation levels and defence/detoxify enzyme (GST) activity in SMA bivalves, respect to the other two populations. The differences in OM quality plus the evident eutrophic process taking place in SMA during last decade are reflected in their population and stress parameters. The absence of young individuals in this site suggests that juvenile mussels are unable to survive under these conditions and/or recruitment to the population is impaired.