INALI   02622
INSTITUTO NACIONAL DE LIMNOLOGIA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Drift of Limnoperna fortunei bivalve in the Middle Paraná River (Argentina)
Autor/es:
MONTALTO, L.; VASCHETTO, P; ROJAS MOLINA, F.
Lugar:
Buenos Aires
Reunión:
Conferencia; Marine & Freshwater Invasive Species: Ecology, Impacts, and Management.; 2016
Institución organizadora:
MACN-CONICET y Aquatic Ecosystem Health and Management Society
Resumen:
This research evaluated the Limnoperna fortunei drift in the MiddleParaná River floodplain in relation to caudal and vertical, lateral and dailyrhythm distribution in the water column. Limnopernafortunei drift samples were collected during spring-autumn 2012-2013, atfour lotic habitats with different caudal (main channel and different secondarychannels); in four sites in a transect perpendicular to the banks in theColastiné secondary channel); and during 24 h at 3 h intervals in Paraná Rivermain channel. In each sites/hours, samples were simultaneously collected in thesurface and at the bottom during 10 minutes, using conical nets (1 m long, 250µm mesh size). Three replicates of each sample were taken. Several physical andchemical parameters were measured. Drift rate was higher in the center than inthe banks of Colastiné River. Daily distribution shows the highest drift rateduring 3 am ? 9 am period, but from then drift rate decreased gradually until18 pm when an increase occurs. In relation to the caudal of rivers, the driftrate decreased from the main channel to the secondary channels. In all sitesthe drift rates were similar between surface and bottom and the individualswere similar in size in both depths. More than 80% of individuals collected inthe environments were < 1 mm in length. In addition, the individuals ofnocturnal periods were larger than those of diurnal period. The present studyprovides new information about L.fortunei drift in the Paraná River floodplain. Results showed that thespecimens of L. fortunei founded indrift are principally represented by pre-reproductive individuals and the driftrates founded were principally related to river caudal, suggesting that theParaná River main channel and the large secondary channels are importantcorridors for the dispersal and recruitment of L. fortunei population.