O estudo foi desenvolvido na Plataforma Continental de Pernambuco (Porto do Recife) objetivando avaliar a influência da pluma do rio Capibaribe na distribuição sazonal e espacial da clorofila a e variáveis ambientais. As coletas de água foram realizadas na superfície em baixa-mar, com garrafa de Niskin, em 4 pontos fixos, no período de estiagem (nov/10, fev e set/11) e chuvoso (mar, mai e jul/11). As variáveis ambientais analisadas foram pluviosidade, profundidade, transparência, temperatura, salinidade, oxigênio dissolvido e taxa de saturação, DBO, MPS, pH, amônia, nitrito, nitrato, fosfato, silicato e clorofila a. A pluviosidade variou de 23,5 a 755,7 mm, a transparência de 0,6 a 6 m; a temperatura de 26 a 30 ºC; a salinidade 12,65 a 36,36; DO de 2,99 a 5,02 ml/L-¹; MPS de ,4 mg.L-¹ a 55,6 mg.L-¹; pH de 7,31 a 8,45; a amônia de 0 a 8,97 μmol.L-¹; o nitrito de 0 a 4,47 μmol.L-¹; o nitrato de 0 a 15,82 μmol.L-¹; o fosfato 0,1 a 6,36 μmol.L-¹; o silicato de 1 a 113,6 μmol.L-¹; e a clorofila a de 0,24 a 19,29 mg.m-³. De acordo com a ACP a pluviosidade foi a forçante física que mais interferiu no sistema mostrando alta correlação direta com nitrito, nitrato e silicato e inversa com a transparência, temperatura, salinidade, OD, DBO, MPS e pH. A clorofila a esteve diretamente correlacionada com a amônia, o fosfato e a profundidade. A pluma do rio Capibaribe teve capacidade de influenciar toda área estudada nos meses de maior pluviosidade. Palavras chave: Fitoplâncton; Biomassa; Zona costeira; Hidrologia.
The Suape coastal zone has suffered since the 1980s the effects of anthropogenic action due to the construction of the industrial complex of Suape. This work aimed to evaluate the environmental conditions and possible eutrophication processes of the area. Six campaigns were carried out, three in the dry season (November 2015, January and April 2016) and three in the rainy season (July 2015, July and August 2016). Water samples were collected at the surface during low tide and high tide, in neap tides. Salinity ranged from 19.75 to 37.20, the dissolved oxygen rate ranged from 61.75 to 125.90% and chlorophyll-a from 0.02 to 3.48 mg m−3. Water transparency, temperature, nitrate and silicate presented significant seasonal variation, the concentrations of nutrients being higher in the rainy season and the others in the dry season. Water transparency, salinity, dissolved oxygen saturation and chl-a <20 µm showed significant differences for tide, being higher at high tide, and at low tide for chl-a of <20 µm. The low content of dissolved inorganic nutrient salts and chl-a were indicative of an area still free of eutrophication. Anthropogenic changes in the environment have led to greater marine interference and consequently to a reduction of the productive capacity of the system.
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