Índice de calidad ecológica con base en macroinvertebrados acuáticos para la cuenca del río Negro (ICERN-MAE), Colombia
Date
2014Author
Forero, Laura Cristina
Longo, Magnolia
Ramírez R., John Jairo
Chalar, Guillermo
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Abstract
Available indices to assess the ecological status of rivers in Colombia are mostly based on subjective
hypotheses about macroinvertebrate tolerance to pollution, which have important limitations. Here we present
the application of a method to establish an index of ecological quality for lotic systems in Colombia. The index,
based on macroinvertebrate abundance and physicochemical variables, was developed as an alternative to the
BMWP-Col index. The method consists on determining an environmental gradient from correlations between
physicochemical variables and abundance. The scores obtained in each sampling point are used in a standardized
correlation for a model of weighted averages (WA). In the WA model abundances are also weighted to estimate
the optimum and tolerance values of each taxon; using this information we estimated the index of ecological
quality based also on macroinvertebrate (ICERN-MAE) abundance in each sampling site. Subsequently, we classified
all sites using the index and concentrations of total phosphorus (TP) in a cluster analysis. Using TP and
ICERN-MAE, mean, maximum, minimum and standard deviation, we defined threshold values corresponding to
three categories of ecological status: good, fair and critical. Rev. Biol. Trop. 62 (Suppl. 2): 233-247. Epub 2014
April 01.
Palabras clave
Ecological status index; BMWP-Col; Macroinvertebrates; Environmental gradient; Tropical streamCollections
- Año 2014 [107]
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