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Acta Biológica Colombiana

Print version ISSN 0120-548X

Abstract

BRICENO VANEGAS, Guillermo. Evolution of the Structural Integrity of Lotic Ecosystems in "Piedemonte Llanero" in Response to Antropogenic Action. Acta biol.Colomb. [online]. 2015, vol.20, n.2, pp.133-144. ISSN 0120-548X.  https://doi.org/10.15446/abc.v20n2.42307.

From 1993 to 2007, was analyzed the evolution of the ecological integrity of two streams in the "piedmont" of Meta, the "caños" Mateguadua and Caibe near to Cumaral and Restrepo districts. The parameters analyzed were landscape evolution, physicochemical variables trends, quality and supply of aquatic habitats and the structural organization of fish communities. Landscape quality declined during the sampling period due to deforestation of gallery forests in both streams. Soil erosion process threw considerable amount of solids particles to streams, causing siltation in the bed of both streams. In fact, this condition affected depth patterns and spatial heterogeneity of aquatic habitats. Fish community structure showed changes in response to environmental degradation, such as the progressive replacement of insectivorous species by phytophagous and algivorous species and the dominance of populations of Hemigrammus barrigonae, a species that prospered on gradual progress of colonies of microalgae and macrophytes in the water due to the riparian forest fragmentation.

Keywords : deforestation; fragmentation; gallery forest; landscape; stream.

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