Abstract

GUTIERREZ-GARAVIZ, Jhonatan; PELAEZ-RODRIGUEZ, Marlon  and  OVALLE-SERRANO, Hernando. Aquatic macroinvertebrate present in fish diets of the basin of Hacha river (Caquetá, Colombia). Rev. acad. colomb. cienc. exact. fis. nat. [online]. 2016, vol.40, n.156, pp.420-432. ISSN 0370-3908.  https://doi.org/10.18257/raccefyn.344.

Aquatic macroinvertebrates (MA) are vital to the daily health of their related habitats, as detritivores, predators, and prey. In this study we demonstrate the trophic importance of MA's, as prey items to fishes in the river basin Hacha (Florencia-Caquetá) by analyzing their stomach contents. Six sampling stations were defined taking into account upper, middle and lower part of the basin; Field samples of MA as reference material and fish were collected were captured 3 arts used traditional fishing. For data analisys, three indices of diversity were calculated for MA; regarding fish stomach contents was estimated percentage frequency of occurrence (%FO) and the percentage of dominance (%D), plotting their values; niche overlap was also evaluated using a cluster with euclidean distance. Stations 1, 2, 3 and 4 showed the best values of diversity of MA. The Characidae family has the highest species richness of Characiformes fish, being Astyanax abramiswith better distribution and abundance. Generalist species that consume aquatic macroinvertebrates and specialist species that may or may not consume aquatic macroinvertebrates were identified. Characidium abramis zebra and Astyanax, are more related to consumption MA. Leporinus fridericiand Leporinus y-ophoruswere those with high niche overlap.

Keywords : Diversity; Eating habits; Fish; Invertivora; Niche overlap.

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