Abstract

RIVERA-USME, JOHN JADER; PINILLA-AGUDELO, GABRIEL ANTONIO  and  RANGEL-CH., J. ORLANDO. Assemblage of aquatic macroinvertebrates and its relationship whit physical and chemical variables in the wetland Jaboque-Colombia. Caldasia [online]. 2013, vol.35, n.2, pp.389-408. ISSN 0366-5232.

From April 2009 to January 2010, the composition and structure of macroinvertebrates assemblages associated with floating vegetation and sediments from the wetland Jaboque (Bogotá, Colombia) were characterized. Physical and chemical water variables were also measured. Macroinvertebrates in the aquatic vegetation comprised 36 genera, (27 confirmed and nine unconfirmed), 27 families, ten orders and five classes. The most abundant families in the macrophytes were Glossiphoniidae, Hyallelidae, and Asellidae. The average abundance was 908 ind/m². The highest density was observed in January 2010 (1099 ind/m²) and the lowest in October 2009 (805 ind/m²). The lowest richness and abundance values were recorded during higher rainfalls seasons. Benthic macroinvertebrates included six genera and five families; Tubificidae, Physidae and Glossiphoniidae were the most abundant; average abundance was 21.5 ind/m².Variables such as ammonia, dissolved oxygen, BOD₅ and temperature showed significant differences between climatic periods. According to the principal component analysis (PCA), the suspended solids explain most of the variation in the data (80.1%), followed by dissolved oxygen (65%). Along with ammonium (68.9%), these variables showed a greater influence on the diversity of aquatic macroinvertebrates. The canonical correlation analysis revealed that the abundance of family Glossiphoniidae was positively related to nitrate concentration and conductivity, while the family Tipulidae it was with dissolved oxygen, thus evidencing that eutrophic and saprobic conditions influence the abundance of these families, probably due to their adaptation to these characteristics. In general, the results are related with the high concentration of organic matter and high levels of eutrophication of this wetland.

Keywords : Aquatic macroinvertebrates; assamblages; urban wetland; Jaboque.

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