Resumo

GARCIA-ALZATE, Carlos A; VILLEGAS-ACOSTA, Paola A  e  ROMAN-VALENCIA, César. PHYSICAL CHEMICAL AND BIOLOGICAL ANALYSIS OF RIO SANTO DOMINGO, RÍO VERDE TRIBUTARY, LA VIEJA RIVER BASIN, ALTO CAUCA, COLOMBIA. Bol. Cient. Mus. Hist. Nat. Univ. Caldas [online]. 2017, vol.21, n.1, pp.31-51. ISSN 0123-3068.  https://doi.org/10.17151/bccm.2017.21.1.3.

A physical-chemical and biological analysis of the Santo Domingo river, Verde river tributary, La Vieja river basin, Alto Cauca, Colombia, was carried out at 12 sampling stations during low rainy (February, June and July) and high rainy seasons (April, March and May). Alpha diversity indexes such as Shannon-Wiener, Dominancia, Margalef and Pielou were applied. Beta diversity indexes with Jaccard and gamma diversity Schluter-Ricklefs and BMWP / Col were applied to estimate water quality. ANOVA showed significant differences between rainy seasons for dissolved oxygen, pH, conductivity and relative humidity. A total of 12,405 macroinvertebrates were recorded: 8,177 in low and 4,228 in high rainy season; Ephemeroptera was the most abundant order for both seasons with the genus Baetodes. The two-factor ANOVA showed significance of absolute abundance between seasons and zones. The BMWP / Col indicated that the water quality was good, except for the station 3 that presented an acceptable quality. A total of 97 specimens of fish were caught: 70 for low and 27 for high rainy season. The most abundant species of fish were Astroblepus chapmani and Brycon henni. Diversity and richness indices were low for macroinvertebrate communities and fish. Gamma diversity for macroinvertebrates and fish was consistent with the number of species found in the study. The river is oligotrophic, with a tendency to eutrophication in both rainy seasons.

Palavras-chave : macroinvertebrates; fish; BMWP/Col; high diversity; beta and gamma.

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