Atributos estructurales de la deriva de invertebrados en el río Chocancharava, Córdoba, Argentina
Abstract
Invertebrate drift of lowland, mediun order river habitats was investigated to determine diurnal, spatial, and seasonal patterns of its structure and composition, and identify drifting organisms according to their original habitat. Drifting organisms came from diverse stream communites: marginal, eupotamic benthos, and remote ones. However, seasonal or circadian rhythms were exhibited by eupotamic species, particularly by the dominant population, Paracloeodes sp, Which occupies unstable beds. High densities and remote benthos specimens were observed in catastrophic drifts. Seasonal changes depended on whether samples were collected before, during, or after important rains. As a result, a uniform association with this variable was not detected. Constant drift, particularly after scouring floods caused by spring and summer rains, was less abundant.
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