Bibliographic Details
| Title: |
Effects of eutrophication on the interaction between algae and grazers in an Andean stream. |
| Authors: |
Donato-Rondón, John Ch.1 jcdonator@unal.edu.co, Morales-Duarte, Silvia Juliana2 sjmoralesd@unal.edu.co, Castro-Rebolledo, María Isabel1 micastror@unal.edu.co |
| Source: |
Hydrobiologia. Dec2010, Vol. 657 Issue 1, p159-166. 8p. 1 Diagram, 2 Charts, 5 Graphs. |
| Subjects: |
Eutrophication, Rivers, Biotic communities, Food chains, Biomass |
| Geographic Terms: |
Andes |
| 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. [ABSTRACT FROM AUTHOR] |
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| Database: |
Engineering Source |
