INALI   02622
INSTITUTO NACIONAL DE LIMNOLOGIA
Unidad Ejecutora - UE
artículos
Título:
Hydraulic parameters and longitudinal distribution of macroinvertebrates in a subtropical andean basin
Autor/es:
MESA L. M.
Revista:
INTERCIENCIA
Editorial:
INTERCIENCIA
Referencias:
Lugar: Caracas, Venezuela; Año: 2010 vol. 35 p. 759 - 764
ISSN:
0378-1844
Resumen:
The influence of hydraulic, substratum and physicochemical variables on the spatial distribution of macroinvertebrate assemblages was analyzed in eleven riffles in a subtropical Andean basin of Northwestern Argentina. Complex hydraulic variables (shear velocity, roughness shear velocity, inferred boundary Reynolds number, Reynolds number, Froude number, shear stress), substrate roughness, relative roughness, and physicochemical variables (water temperature, conductivity and pH) were used in order to identify those significantly related with the distribution of macroinvertebrate assemblages. Water temperature, conductivity and pH were significantly higher in lower altitude sites, whereas substrate roughness, shear velocity and shear stress increased in upper sites. Total macroinvertebrate abundance was higher in lower reaches, whereas invertebrate diversity decreased from upper to lower sites. Longitudinal changes in hydraulic variables, substrate roughness and conductivity represent the major factors affecting the benthic invertebrates distribution of Lules River basin.