DOL - Departamento de Oceanografia e Limnologia

URI Permanente desta comunidadehttps://repositorio.ufrn.br/handle/1/11

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Extreme droughts drive tropical semi-arid eutrophic reservoirs towards CO2 sub-saturation
(Associação Brasileira de Limnologia, 2018-04-05) Becker, Vanessa; Mendonça Júnior, Jurandir Rodrigues de; Amado, André Megali; Vidal, Luciana de Oliveira; Mattos, Arthur
Aim: This study aimed to evaluate the carbon dioxide (CO2) dynamics in tropical semi-arid reservoirs during a prolonged drought period as well as to test if the trophic state affects the CO 2 saturation. Methods: This study was performed in four reservoirs located in the tropical semi-arid region in the northeast of Brazil. All samplings were performed between 9 and 12 am using a Van Dorn Bottle. Samples for partial pressure of carbon dioxide (pCO2) measurements were taken in the sub-surface as well as samples for total phosphorus and chlorophyll-a. Correlation analysis and linear regression were used to detect relations among the calculated pCO2, water volume and chlorophyll-a. Results: The water level reduction due to atypical droughts caused chlorophyll-a concentrations to increase, which in turn, led to CO 2 reduction in the water. However, CO2 concentrations were very variable and an alternation between CO 2 sub-saturation and super-saturation conditions was observed. This paper showed that water volume and chlorophyll-a were important regulators of CO2 in the water, as well as important carbon balance predictors in the tropical semiarid reservoirs. Conclusions: The results of this paper indicate that the eutrophication allied to drastic water level reductions lead to a tendency of autotrophic metabolism of these systems

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Navegando DOL - Departamento de Oceanografia e Limnologia por Assunto "Carbon source"