EVALUATION OF LIMITING NUTRIENT OF ALGAL PRODUCTION IN RESERVOIRS OF THE BRAZILIAN SEMIARID

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Mário Cesar Wiegand
Antônia Tatiana Pinheiro do Nascimento
Alexandre Cunha Costa
Iran Eduardo Lima Neto

Abstract

Nutrient overload in artificial reservoirs can pose a risk to human health and aquatic biodiversity. Thus, the trophic state of a reservoir is an important characteristic for understanding its environmental conditions and possible uses. Its description can be made from the concentration of nutrients, mainly phosphorus. Thus, this study tested the hypothesis that total phosphorus is the limiting nutrient of phytoplankton growth in Brazilian semiarid reservoirs. Three empirical models were used to infer the status of limiting nutrient. In addition, a multiple linear regression analysis was used to establish the causality relationship between nutrients (total nitrogen — TN and total phosphorus — TP) and algal production. The results did not confirm the hypothesis. According to two models used, the TN was the preponderant factor for algal production in about 60% of the reservoirs. This was also observed in the linear regression analysis. According to Carlson’s model, herbivory can be an important factor in algal development. Thus, our results showed that eutrophication by both nutrients, especially the TN, and zooplankton grazing deserve to be considered.

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How to Cite
Wiegand, M., do Nascimento, A. T., Costa, A., & Neto, I. E. (2020). EVALUATION OF LIMITING NUTRIENT OF ALGAL PRODUCTION IN RESERVOIRS OF THE BRAZILIAN SEMIARID. Brazilian Journal of Environmental Sciences (Online), 55(4), 456 - 478. https://doi.org/10.5327/Z2176-947820200681
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Articles
Author Biographies

Mário Cesar Wiegand, Universidade Federal do Ceará (UFC)

Bolsista de Pós-Doutorado do Programa de Pós-Graduação em Engenharia Civil/Departamento de Engenharia Hidráulica e Ambiental /Universidade Federal do Ceará – UFC. Campus do Pici – Bloco 713 – Fortaleza/CE. Fone: (85)3366-9624 e-mail: mcwiegand@bol.com.br

Antônia Tatiana Pinheiro do Nascimento, Instituto Federal de Educação, Ciência e Tecnologia do Ceará

Mestre em Energias Renováveis (Instituto Federal de Educação, Ciência e Tecnologia do Ceará). Tel.: (85) 9.8756-3868, e-mail: tati16pinheiro@yahoo.com.br

Alexandre Cunha Costa, Universidade da Integração Internacional da Lusofonia Afro-Brasileira (UNILAB)

Professor da Universidade da Integração Internacional da Lusofonia Afro-Brasileira (UNILAB), Instituto de Engenharias e Desenvolvimento Sustentável.  

Iran Eduardo Lima Neto, Universidade Federal do Ceará (UFC)

Professor do Departamento de Engenharia Hidráulica e Ambiental/Universidade Federal do Ceará - UFC. Campus do Pici – Bloco 713 – Fortaleza/CE