INIBIOMA   20415
INSTITUTO DE INVESTIGACIONES EN BIODIVERSIDAD Y MEDIOAMBIENTE
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
COMMUNITIES OF MACROPARASITES OF FRESHWATER FISHES FROM PATAGONIAN ANDEAN LAKES OF ARGENTINA
Autor/es:
L. SEMENAS; C. RAUQUE; V. FLORES; G. VIOZZI; N. BRUGNI ; V. FERNÁNDEZ; R. VEGA
Lugar:
Melbourne
Reunión:
Congreso; ICOPA XII; 2010
Resumen:
In Argentina no studies of component
community of macroparasites of freshwater fish have been performed. The aim of
this study was to describe and compare the macroparasite component communities between
3 oligotrophic lakes with differences in areas, presence of shoreline
vegetation and/or fish assemblages, hypothesizing that the macroparasite
richness is different in relation to the combination of these characteristics.
The smallest lake has an area of
0.01 km 2
and the medium 16.4 km2 , both with vegetated shoreline. The biggest one has an
area of 557 km 2 without
vegetation in the shoreline. Samples of fishes were collected seasonally with
nets in different sites in each lake. In total, the following native species
were captured: 1,150 Galaxias maculatus, 97 Galaxias platei, 28 Diplomystes
viedmensis, 27 Odontesthes hatcheri and 306 Percichthys trucha.
The exotic species comprised: 213 Oncorhynchus mykiss, 72 Salvelinus
fontinalis and 18 Salmo trutta. All fish organs were examined, and
macroparasites were identified to calculate richness. The most common taxa were
digeneans, and nematodes. Richness was 18 in the smallest lake with 2 native
and 1 exotic fish species, 31 in the medium lake and 27 in the largest both
with the same assemblage of fish species, 5 native and 3 exotic. The lowest
macroparasites species richness was found in the smallest lake with the lower
fish assemblage. When the medium and large lakes are analyzed, macroparasite
richness increased at least 70%. Considering the same fish assemblage is
present in both lakes, differences in richness can be
attributed to the presence of refugees associated with shoreline vegetation.