Resumen

RIVERA USME, JOHN JADER; PINILLA AGUDELO, GABRIEL  y  CAMACHO PINZON, DIANA LUCÍA. Macroinvertebrate Trophic Groups in an Andean Wetland of Colombia. Acta biol.Colomb. [online]. 2013, vol.18, n.2, pp.279-292. ISSN 0120-548X.

In the wetland Jaboque (Bogotá, Colombia) the physical and chemical properties of the water and the food dietary guilds of the aquatic macroinvertebrate community were analyzed from April 2009 to January 2010. The wetland waters had a slightly acid character with high values of nitrate, ammonia and orthophosphate, so this ecosystem is classified as eutrophic to hypereutrophic. In the aquatic macroinvertebrate community six food groups were recorded; they were conformed by 27 families, 26 confirmed genera and nine to be confirmed, with a total of 6,403 individuals collected in 28 samples of macrophytes. The highest abundances corresponded to detritivores (43.5 %), collector-scrapers (31.5 %), and collector-shredders (14.1 %), which were more abundant in the months of low rainfall. Stomach contents of some of the organisms showed that most of these individuals consumed more than one food type and high amounts of organic matter. Detrended correspondence analysis (DCA) showed a spatial (stations) and temporal (climatic seasons) organization, in which trophic guilds are grouped according to their niche requirements, environmental fluctuations or anthropogenic factors. Variations in dietary groups reflected changes in the macroinvertebrate community from a functional perspective and indicated that the wetland is very disturbed by urban activities.

Palabras clave : aquatic macroinvertebrates; food functional groups; Jaboque; urban wetland.

        · resumen en Español     · texto en Español     · Español ( pdf )