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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The authors thank the financing of the Universidad Nacional de Colombia – Colciencias and the BBVA Foundation, in the framework of the project “Global Changes in fluvial systems: effects on the trophic web, biodiversity and functional aspects” (GLOBRIO). We appreciate the critical reading of the manuscript by Gary Stiles, Universidad Nacional de Colombia.
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Guest editors: R. J. Stevenson, S. Sabater / Global Change and River Ecosystems – Implications for Structure, Function and Ecosystem Services
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Donato-Rondón, J.C., Morales-Duarte, S.J. & Castro-Rebolledo, M.I. Effects of eutrophication on the interaction between algae and grazers in an Andean stream. Hydrobiologia 657, 159–166 (2010). https://doi.org/10.1007/s10750-010-0194-y
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DOI: https://doi.org/10.1007/s10750-010-0194-y