Hydrogeomorphological patterns of a neotropical mountain stream channel
DOI:
https://doi.org/10.53157/ecotropicos.cey3-06jqKeywords:
correderas, hidrogeomorfología, rapidos, remansos, tramos de riosAbstract
At the local scale, lotic ecosystems and especially their biotic component seem to be affected by spatiotemporal changes in flow and morphology of the reach; the latter define the physical habitats that host the communities. To demonstrate whether the hydrogeomorphological arrangements at the scale of reaches and habitats visualized as patches can be differentiated spatiotemporally, based on hydromorphometry, physicochemistry and environmental quality, the micro-basin of a neotropical river was characterized. In seven sampling campaigns distributed between drought and rain in 2012; in four reaches systems and three habitats identified according to two recognized classification systems: Riffles-Pools (RR), Bed-Plane (LP), Step-Pools (ER) and Waterfall (C) for reaches, and pools, runs and riffles for habitats; the variables related to the morphometry of a river, its physicochemistry and environmental condition were measured. At the reach level, a non-metric multidimensional scaling and a Principal Component Analysis revealed the tendency to differentiate them, which was confirmed by a Similarity Analysis; RR and LP were more dissimilar to each other than ER and C; hydraulic variables, together with substrate arrangement and heterogeneity, plus conductivity were the main determinants in the differentiation. Regarding habitats, each type was recognized based on the speed and accumulation of fine organic matter. The knowledge generated by baseline research has an important impact on the management and conservation of watersheds, both at the ecosystem level and for the services it provides.
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