Revista de Gestão Costeira Integrada
Volume 24, Issue 1, June 2024, Pages 31-40
DOI: 10.5894/rgci-n527
* Submission: 31 MAY 2023; Peer review: 24 JAN 2024; Revised: 9 MAY 2024; Accepted: 9 MAY 2024; Available on-line: 21 OCT 2024
Seasonal variation of physical and chemical conditions in the Goiana and Megaó estuary, northeastern Brazil
Ivo Raposo Gonçalves Cidreira Neto@ 1, Betânia Cristina Guilherme2, Gilberto Gonçalves Rodrigues1, Ana Lúcia Bezerra Candeias1
@ Corresponding author: ivo.raposo@hotmail.com
1 Universidade Federal de Pernambuco
1 Universidade Federal Rural de Pernambuco
ABSTRACT
Estuaries are coastal ecosystems of transition between continental and marine waters, among their characteristics, there is the salinity variation due to tidal cycles, being necessary environmental monitoring actions for the identification of possible anthropic influences. The aim was to characterize seasonally the physical and chemical variables of water in the estuary of the rivers Goiana and Megaó. The study area comprises the estuary of the Goiana and Megaó rivers, located in the Northeast of Brazil, and is a protected area of sustainable use for the development of artisanal fisheries. A total of 20 points along the estuary were sampled during the months of May, July, September and November 2021, January and March 2022, collecting temperature (ºC), pH, salinity, dissolved oxygen (mg/L) and transparency (cm). Temperature, salinity and transparency varied significantly between the dry and rainy seasons. The dissolved oxygen registered was lower than that described in the Brazilian legislation, causing a state of hypoxia in the estuary. Mitigation measures are needed to improve the quality of the estuarine water, ensuring the maintenance of local biodiversity.
Keywords: Coastal Ecosystem; Tropical Estuary; Conservation; Water Quality.
RESUMO
Os estuários são ecossistemas costeiros de transição entre águas continentais e marinhas, entre suas características, há a variação de salinidade devido aos ciclos das marés, sendo necessárias ações de monitoramento ambiental para a identificação de possíveis influências antrópicas. O objetivo foi caracterizar sazonalmente as variáveis físicas e químicas da água no estuário dos rios Goiana e Megaó. A área de estudo compreende o estuário dos rios Goiana e Megaó, localizado no Nordeste do Brasil, e é uma área protegida de uso sustentável para o desenvolvimento da pesca artesanal. Um total de 20 pontos ao longo do estuário foram amostrados durante os meses de maio, julho, setembro e novembro de 2021, janeiro e março de 2022, coletando temperatura (ºC), pH, salinidade, oxigênio dissolvido (mg/L) e transparência (cm). Temperatura, salinidade e transparência variaram significativamente entre as estações seca e chuvosa. O oxigênio dissolvido registrado foi inferior ao descrito na legislação brasileira, causando um estado de hipóxia no estuário. Medidas de mitigação são necessárias para melhorar a qualidade da água estuarina, garantindo a manutenção da biodiversidade local.
Palavras-chave: Ecossistema Costeiro; Estuário Tropical; Conservação; Qualidade da Água.
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