Variação da Clorofila a do Fitoplâncton na Plataforma Continental de Pernambuco.

Passavante, José Zanon de Oliveira; Gomes, Núbia Abrantes; Eskinazi-Leça, Enide; Feitosa, Fernando Antônio do Nascimento

doi:10.5914/tropocean.v20i1.2629

Cited by 10 publications

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“…Mean Chl-a concentrations in the present study were high -more than half of those reported for shelf waters off northeastern Brazil (Passavante et al 1987/89;Passavante & Feitosa 1995;Ekau & Knoppers 1996;Medeiros et al 1999). Based on the Häkanson (1994) classifi cation, these values indicate mesotrophic environments near the shipwrecks.…”

Section: Discussionsupporting

confidence: 57%

Characterization of phytoplankton biodiversity in tropical shipwrecks off the coast of Pernambuco, Brazil

et al. 2010

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RESUMO -(Caracterização da biodiversidade do fi toplâncton em naufrágios tropicais da costa de Pernambuco, Brasil). A comunidade fi toplanctônica foi estudada nas adjacências de dois recifes artifi ciais (naufrágios Servemar-X e Servemar-I), na costa de Pernambuco, nordeste do Brasil, com o intuito de identifi cá-la e melhor caracterizar esses ambientes. Amostras de água foram coletadas com garrafa de Nansen em três profundidades (superfície, meio e fundo) para a análise da clorofi la a e salinidade, obtendo-se ainda dados de temperatura e transparência da água. Para coleta do fi toplâncton, um mergulhador utilizando equipamento SCUBA realizou arrastos com uma rede de 20 μm ao redor dos naufrágios a 1,5 m do fundo, por cerca de 3 minutos. A concentração de clorofi la a foi mais elevada no fundo variando entre 0,61 e 5,97 mg.m -3, com a média indicando ambiente mesotrófi co. A temperatura e a salinidade apresentaram uma pequena variação sazonal e a transparência da água mostrou um padrão sazonal e espacial estando positivamente relacionada aos teores de clorofi la a. Em relação à comunidade fi toplanctônica, o grupo das diatomáceas apareceu em maior representatividade nas amostras, seguido dos dinofl agelados, e entre as espécies sobressaiu em termos quantitativos a cianobactéria Trichodesmium thiebautii Gomont ex Gomont. A importância ecológica desses ecossistemas fi cou comprovada através dos altos índices de diversidade e equitabilidade, sendo a infl uência das águas costeiras fator determinante da estrutura e diversidade da comunidade fi toplanctônica. Palavras-chave: clorofi la a, recife artifi cial, Trichodesmium, mergulho ABSTRACT -(Characterization of phytoplankton biodiversity in tropical shipwrecks off the coast of Pernambuco -Brazil). The phytoplankton community was studied around two artifi cial reefs (shipwrecks Servemar-X and Servemar-I), located off the coast of Pernambuco, northeastern Brazil, aiming to identify and thus, better describe these environments. Water samples were collected with Nansen bottle at three depths (surface, mid-column and bottom) for chlorophyll a analysis and salinity; temperature and water transparency were also measured. To collect phytoplankton samples, a diver using SCUBA equipment carried out phytoplankton hauls with a 20 μm net around the shipwrecks, about 1.5 m from the bottom for approximatly 3 minutes. Chlorophyll a concentrations at the bottom varied between 0. 61 and 5.97 mg.m -3 , with an average that indicates a mesotrophic environment. Temperature and salinity registered small seasonal variation, while water transparency showed a seasonal spatial pattern positively related to Chl-a rates. As regards the phytoplankton community, diatoms were the most representative group in the samples, followed by dinofl agellates, and among the species, the cyanobacteria Trichodesmium thiebautii Gomont ex Gomont prevailed quantitatively. The ecological importance of these ecosystems was confi rmed by the high diversity and evenness indexes, with the infl uence of coastal...

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Section: Discussionsupporting

confidence: 57%

Characterization of phytoplankton biodiversity in tropical shipwrecks off the coast of Pernambuco, Brazil

et al. 2010

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“…However in the areas where the upwelling was not observed, the recycling processes and regeneration of the superficial organic matter became an important source of the nutrients (Taniguchi, 1972). The nutrients, primary production and plankton are submitted to the temporal variability, in the waters near the coast to Pernambuco (Eskinazi-Leça and Koening, 1986;Gomes, 1991;Passavante and Feitosa, 1995;). The variation in the hydrographic structure seems to have an important influence on the spawning season and area as well as on the distribution pattern and abundance of the fishes larvae (Sabatés et al 2001).…”

Section: Discussionmentioning

confidence: 99%

Distribution and abundance of carangidae (Teleostei, Perciformes) associated with oceanographic factors along the northeast brazilian exclusive economic zone

Souza

Júnior

2008

Braz. arch. biol. technol.

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“…The remineralization of this organic matter might influence the physico-chemical characteristics of coastal waters in very localized and episodic events. Values of temperature, salinity, Chl-a and dissolved inorganic nutrients in most samples were similar to those found on the oligotrophic eastern Brazilian coast (EKAU; LEIPE et al, 1999;SUSINI-RIBEIRO, 1999) and other tropical continental shelves (PASSAVANTE;FEITOSA, 1995;BURFORD;ROTHLISBERG, 1999;OVALLE et al, 1999;GIANESELLA;SALDANHA-CORRÊA, 2003;ZELDIS, 2004;PEDROSA et al, 2006;SIGNORET et al, 2006;LUGIOYO et al, 2007;SEBASTIÁ;RODILLA, 2013) (Tab. 2).…”

Section: Discussionmentioning

confidence: 52%

Dissolved inorganic nutrients and chlorophyll on the narrow continental shelf of Eastern Brazil

et al. 2014

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The eastern Brazilian continental shelf is narrow and subject to the influence of a western boundary current system, presenting lower biological productivity than other regions. In this study, the distribution of water masses, dissolved inorganic nutrients, chlorophyll-a and total suspended solids (TSS) on the inner shelf (< 35 m depth), between Itacaré and Canavieiras, eastern Brazil, is presented. Sampling surveys were carried out in March and August 2006 and March 2007. Tropical water (TW) prevailed during March 2006 and August 2007 with the lower salinity waters (< 36) found in most samples taken in March 2007, reflecting the influence of continental outflow and rain in coastal waters. Low concentrations of dissolved inorganic nutrients and Chl-a found were typical of TW and results suggested that the inner shelf waters were depleted in dissolved inorganic nitrogen in August 2006 and March 2007, and in phosphate in March 2006, potentially affecting phytoplankton growth. Stratification of the water column was observed due to differences in dissolved nutrient concentrations, chlorophyll-a and TSS when comparing surface and bottom samples, possibly the result of a colder water intrusion and mixing on the bottom shelf and a deep chlorophyll maximum and/or sediment resuspension effect. Despite this stratification, oceanographic processes such as lateral mixing driven by the Brazil Current as well as a northward alongshore drift driven by winds and tides transporting Coastal Water can lead to an enhanced mixing of these waters promoting some heterogeneity in this oligotrophic environment.

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Variação da Clorofila a do Fitoplâncton na Plataforma Continental de Pernambuco.

Cited by 10 publications

References 0 publications

Characterization of phytoplankton biodiversity in tropical shipwrecks off the coast of Pernambuco, Brazil

Characterization of phytoplankton biodiversity in tropical shipwrecks off the coast of Pernambuco, Brazil

Distribution and abundance of carangidae (Teleostei, Perciformes) associated with oceanographic factors along the northeast brazilian exclusive economic zone

Dissolved inorganic nutrients and chlorophyll on the narrow continental shelf of Eastern Brazil

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