ECOSYSTEM REGULATION SERVICES IN AQUATIC ENVIRONMENTS: THE CASE OF IBIRITÉ RESERVOIR, MINAS GERAIS

Francisco Antônio Rodrigues Barbosa, Maria Margarida Marques, Pedro Maia-Barbosa, Aline Morena Menezes Santos, Marcelo Augusto Rezende Costa

Abstract


This chapter presents the physical, chemical and biological features of water collections within the watershed of Ibirité reservoir with which were made comparisons among limnological variables, namely water temperature, concentrations of dissolved oxygen, nutrients (ammonium-, nitrite, nitrate-, and total nitrogen, soluble reactive phosphorus, total phosphorus), along with chlorophyll-a, algae richness and density from sampling points upstream the reservoir (point 1C), within the reservoir (points 2, 3, 4) and just downstream the reservoir (point 10). These comparisons allowed the verification of a significant reduction of nutrient and chlorophyll-a concentrations and the increase of oxygen concentration at point 10 which were used to demonstrate the effectiveness of ecosystem services, namely recovery and provisioning of water quality provided by the reservoir and that are essentials for the maintenance of aquatic communities, particularly the phytoplankton one.


Keywords


Nutrient retention; water quality; eutrophication control; conservation of phytoplankton richness and diversity

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