Pollution in Lago de Tota, Colombia: acute toxicity on Daphnia magna (Cladocera: Daphniidae) and Hydra attenuata (Hydroida: Hydridae): Pollution in Lago de Tota, Colombia: acute toxicity on Daphnia magna (Cladocera: Daphniidae) and Hydra attenuata (Hydroida: Hydridae


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Bibliographic Details
Authors: Barrera Herrera, July Andrea, Espinosa, Adriana Janneth, Álvarez, Juan Pablo
Format: artículo
Status:Versión publicada
Publication Date:2019
Description:Lago de Tota basin is currently being impacted by human activities like agriculture, deforestation, large-scale fish farming and monoculture of onion long (Allium fistulosum) with high use of agrochemicals and chicken manure that contaminate runoff to aquatic systems in the largest high mountain lake in Colombia. We implemented toxicity tests to evaluate possible deleterious effects of contaminants on H. attenuata and D. magna, model organisms commonly used in aquatic contamination assessment. Firstly, the organisms were acclimated and toxicity tests were validated in laboratory conditions. Later, water and sediments (elutriates) were evaluated from tributaries of Lago de Tota basin: Hato Laguna, El Tobal, Los Pozos, and Agua Blanca stream, during two contrasting hydroclimatic periods. In addition, pesticides insediments were evaluated with chromatography, spectrometry and ultraviolet detection techniques. Acute toxicity tests showed that H. attenuata was more sensitive than D. magna, as it showed sublethal (Kruskal-Wallis; P < 0.05) and lethal responses to exposure to waters and elutriates from Hato Laguna, El Tobal, and Los Pozos. At least five pesticides not quantified before in the basin were detected in chemical analyses (chlorothalonil, aldrin, dieldrin, DDT y congeners). These results indicate that anthropogenic activities have a potentially negative influence in aquatic communities composition, structure, and function, it´s demand attention in future research.
Country:Portal de Revistas UCR
Institution:Universidad de Costa Rica
Repositorio:Portal de Revistas UCR
OAI Identifier:oai:portal.ucr.ac.cr:article/33573
Online Access:https://revistas.ucr.ac.cr/index.php/rbt/article/view/33573
Access Level:acceso abierto
Keyword:Lago de Tota
Daphnia magna
Hydra attenuata