Effects of eutrophication on the interaction between algae and grazers in an Andean stream |
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Authors: | John Ch Donato-Rondón Silvia Juliana Morales-Duarte María Isabel Castro-Rebolledo |
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Institution: | 1.Departamento de Biología,Universidad Nacional de Colombia,Bogotá,Colombia;2.Escuela de Biología,Universidad Industrial de Santander,Bucaramanga,Colombia |
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Abstract: | Nutrient excess is a common disturbance that affects biological interactions in river ecosystems. The response of nutrient
supply on primary producers and Tricorythodes sp., a common mayfly grazer, was determined in experimental chambers set in a tropical, high Andean stream. Chambers in an
experimentally fertilized reach developed higher amount of both benthic and detached chlorophyll than chambers in an upstream
control reach. Fertilization produced a slight increase in grazer biomass, and reduced algal biomass compared to grazer-free
chambers. These results show that nutrient excess spread bottom-up effects through the food web, and that relevant top-down
effects could also be detected. Eutrophication may produce relevant changes in the food web of tropical high-mountain streams. |
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