Influência de Variáveis Ambientais na Comunidade Fitoplanctônica nos Reservatórios Receptores do Projeto de Integração do Rio São Francisco (The Influence of Environmental Variables on Phytoplankton Community of the Receptors Reservoirs by the São...)

Abstract

O objetivo do presente trabalho é avaliar as características físico-químicas e microbiológicas dos reservatórios da região do semiárido brasileiro, receptores de água do Projeto de Integração do rio São Francisco, identificando a influência de variáveis ambientais na comunidade fitoplanctônica. Foram estudados os reservatórios de Itaparica, Poço da Cruz, Boqueirão, Armando Ribeiro Gonçalves e Castanhão. Para alcançar o objetivo proposto, foram feitas análises estatísticas multivariadas com auxílio dos programas Primer e SPSS. Verificou-se que os reservatórios se diferenciam em dois grupos (Eixo Leste e Eixo Norte), observando-se a existência de uma variação temporal. As variáveis ambientais explicaram 78% da variação do fitoplâncton. Destes 22% são explicados por variáveis tipológicas (naturais) e 56% são explicados por variáveis de pressão (efeito antropogênico). Espera-se que a transferência de água possa contribuir para melhoria da qualidade da água, sendo fundamental a implementação de medidas que promovam uma gestão integrada e sustentável das respectivas bacias hidrográficas.
 
 Palavras-chave: variáveis ambientais, fitoplâncton, reservatórios, semiárido
 
 
 The Influence of Environmental Variables on Phytoplankton Community of the Receptors Reservoirs by the São Francisco River Integration Project
 
 
 ABSTRACT
 
 This study aims to evaluate the physico-chemical and microbiological characteristics of brazilian northeast reservoirs, from the São Francisco river Integration Project, to identify the influence of environmental variables on the phytoplankton community. There were studied the reservoirs of Itaparica, Poço da Cruz, Boqueirão, Armando Ribeiro Gonçalves and Castanhão. To achieve the proposed aim, multivariate statistical analyses were performed with the Primer and SPSS programs. It was observed that the reservoirs are distinguish in two groups (East and North Axis), observing the existence of a temporal variation. It was verified that the environmental variables explained 78% of the phytoplankton variation. Of these, 22% are explained by typological variables and 56% are explained by pressure variable. It is expected that the transfer of water may improve water quality (especially in reservoirs of the East Axis). It is essential to implement actions to promote an integrated and sustainable management of their watersheds.
 
 Keywords: environmental variables, phytoplankton, reservoirs, semiarid

Modeling the impacts of climate extremes and multiple water uses to support water management in the Icó-Mandantes Bay, Northeast Brazil

“…The results showed that the residence time of the bay was significantly reduced, up to around 50%, suggesting that the water withdrawal from the Icó-Mandantes Bay might affect the mixing of water at the local scale and be a positive side effect on water quality, as pollution will be diluted faster. Model scenarios investigating the impacts of water diversion channels, to improve lakes' dynamics and thus water quality, can be found, for example in Li et al (2013), and specifically for Itaparica Reservoir in Melo et al (2012). Further studies in this direction are needed and must be adapted to each specific case.…”

“…However, the management strategy of the two axes is still under discussion. The Brazilian Ministry of National Integration reported that while negatively affecting the biotic environment, the water diversion project is expected to stimulate the local economy and increase water supply for the semi-arid regions, which is of great importance for the development of the country (de Castro 2011;Melo et al 2012;Ministry of National Integration 2016).…”