Eutrophication effects on phytoplankton size-fractioned biomass and production at a tropical estuary

Guenther, Mariana; Araújo, Moacyr; Flores‐Montes, Manuel; Gonzalez‐Rodriguez, Eliane; Neumann‐Leitão, Sigrid

doi:10.1016/j.marpolbul.2014.09.048

Cited by 40 publications

(33 citation statements)

References 34 publications

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“…The Recife harbor (08°03'S; 34°52'W, Recife -PE, Brazil) is a hypereutrophic well-mixed estuary with high primary production rates (GUENTHER et al, 2015). Situated in a densely populated area of the city, it is supplied by three urban and intensely polluted rivers: the Pina, Capibaribe and Beberibe.…”

Section: Study Sitementioning

confidence: 99%

“…1). Tides are semidiurnal with maximum ranges of 2.3 m. Tidal currents are strong (30 cm s -1 on average), leading to residence times of 5-9 h, shorter than a complete tidal cycle (GUENTHER et al, 2015). The local climate is tropical humid with dry summers and wet winters (KÖPPEN, 1900).…”

Section: Study Sitementioning

confidence: 99%

“…1), during both ebb and flood tides, every 3 months during a year (January, April, July and October, 2008). The months sampled represent the wet (April and July) and dry (October and January) seasons (see GUENTHER et al, 2015). The stations were sampled opposed to the water flow, i.e., from the outer to the inner estuary during the ebb tide and conversely during the flood tide.…”

Section: Experimental Design and Sample Analysesmentioning

confidence: 99%

“…The meteorological conditions and the circulation dynamics of this system during this period have been presented and discussed elsewhere (GUENTHER et al, 2015).…”

Section: Experimental Design and Sample Analysesmentioning

confidence: 99%

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High bacterial carbon demand and low growth efficiency at a tropical hypereutrophic estuary: importance of dissolved organic matter remineralization

et al. 2017

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et al.: High BCD and low BGE at a hypereutrophic estuary 382High bacterial carbon demand and low growth efficiency at a tropical hypereutrophic estuary: importance of dissolved organic matter remineralization Medidas simultâneas de produção (PB) e respiração bacterianas (RB) são indispensáveis para o entendimento da magnitude do ciclo do carbono nos níveis tróficos mais basais dos sistemas aquáticos, mas são ainda escassas nos trópicos. O presente estudo foi realizado em um estuário extremamente produtivo (Porto do Recife, 08°03'S; 34°52'W, NE do Brasil), onde a demanda bacteriana por carbono (DBC=PB+RB) e a eficiência de crescimento bacteriano (ECB=PB/DBC) foram determinadas para estimar o principal papel do bacterioplâncton: fonte ou captador de carbono orgânico. Apesar das altas taxas de PB (0.03-0.4 µMC h -1 ), as taxas extremas de RB (0.5-4.1 µMC h -1 ) levaram a baixa ECB (0.02-0.29), provavelmente devido às altas temperaturas (>25 o C) e forte limitação por nitrogênio inorgânico (razão N:P) A alta DBC e a baixa ECB indicam que o bacterioplâncton esteja atuando principalmente como remineralizador da matéria orgânica dissolvida, alimentando a produção primaria do sistema. Esses resultados contradizem o que seria esperado baseado em estudos conduzidos em estuários eutróficos temperados (onde geralmente ECB > 0.30) e apontam para a importância de se aumentar estimativas in situ de PB e RB em sistemas estuarinos tropicais a fim de se promover um melhor entendimento do papel desses sistemas na ciclagem de carbono global. Simultaneous measurements of bacterioplankton production (BP) and respiration (BR) are imperative to understand the magnitude of carbon cycle in the lower trophic levels of the aquatic systems, but are still scarce in the tropics. The present study was performed in a highly productive estuary (Recife harbor, 08°03'S; 34°52'W, NE Brazil) where bacterial carbon demand (BCD=BP+BR) and growth efficiency (BGE=BP/BCD) were evaluated in order to estimate the major role of bacterioplankton: source or sink of organic carbon. In spite of the high BP rates (0.03-0.4 µMC h -1 ), the extremely high BR rates (0.5-4.1 µMC h -1 ) led to low BGE (0.02-0.29), possibly due to the high temperatures (>25 o C) and strong inorganic nitrogen limitation (N:P ratios) The high BCD and low BGE indicate the major role of bacterioplankton as dissolved organic matter remineralizers, fueling the primary productivity of the system. These findings contradict what could be expected from studies in highly productive temperate estuaries (where BGE is usually > 0.30) and highlight the importance of increasing in situ BP and BR estimates in tropical estuarine systems in order to better understand the role of these systems in global carbon cycling. Resumo AbstRActDescritores: Bacterioplâncton, Produção bacteriana, Respiração bacteriana, Alça microbiana, DBC, ECB.

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Section: Study Sitementioning

confidence: 99%

Section: Study Sitementioning

confidence: 99%

Section: Experimental Design and Sample Analysesmentioning

confidence: 99%

“…The meteorological conditions and the circulation dynamics of this system during this period have been presented and discussed elsewhere (GUENTHER et al, 2015).…”

Section: Experimental Design and Sample Analysesmentioning

confidence: 99%

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High bacterial carbon demand and low growth efficiency at a tropical hypereutrophic estuary: importance of dissolved organic matter remineralization

et al. 2017

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“…Similar to other estuaries worldwide (PAERL et al, 2006), many tropical semiarid estuaries are impacted by anthropogenic disturbance such as high nitrogen and phosphorus input from agriculture, aquaculture and domestic and industrial effluents (LACERDA et al, 2008;GUENTHER et al, 2015), and are especially modified by dams that alter freshwater river discharge (MOLISANI et al, 2006). Due to natural water scarcity, the consequences of anthropogenic impacts on semiarid estuaries may be even more severe than on estuaries with high-fluvial discharge in temperate zones.…”

Section: Introductionmentioning

confidence: 99%

Influence of river discharge on phytoplankton structure and nutrient concentrations in four tropical semiarid estuaries

2016

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This study evaluated changes in phytoplankton and nutrients after an increase in river discharge in four estuaries of northeastern Brazil. Samples were taken during a markedly freshwater-deprived period (Nov/2010, dry season), and during a rainy season (May/2011). While two estuaries are located in urban areas (Ceará -CE and Cocó -CO), the others are markedly freshwater-deprived (Pacoti -PAC and Pirangi -PIR). Our findings indicate that increased freshwater had opposing effects on estuaries impacted by anthropogenic discharges (CO, CE and PIR) compared with the other, less impacted (PAC). In CO and CE, the freshwater flow during the rainy period had a nutrient diluting effect and controlled phytoplankton blooms. In PIR, only phosphorus and inorganic nitrogen decreased in the rainy season. In contrast, an increase of all nutrients was observed in PAC, and of TN in PIR, followed by an increase in phytoplankton biomass. In the rainy season, eutrophic freshwater species dominated in all the estuaries. In the dry season, blooms of Cryptomonas/Rhodomonas and Synechocystis aquatilis were, respectively, observed in CE and CO. Also in the dry season, PAC and PIR had a predominance of marine species under a condition of hypersalinity. Canonical correspondence analysis suggested the variation observed for salinity, silica, and TN are the main driver of phytoplankton structure. AbstrAct

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Effect of ocean warming and acidification on the Fe(II) oxidation rate in oligotrophic and eutrophic natural waters

2016

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Eutrophication effects on phytoplankton size-fractioned biomass and production at a tropical estuary

Cited by 40 publications

References 34 publications

High bacterial carbon demand and low growth efficiency at a tropical hypereutrophic estuary: importance of dissolved organic matter remineralization

High bacterial carbon demand and low growth efficiency at a tropical hypereutrophic estuary: importance of dissolved organic matter remineralization

Influence of river discharge on phytoplankton structure and nutrient concentrations in four tropical semiarid estuaries

Effect of ocean warming and acidification on the Fe(II) oxidation rate in oligotrophic and eutrophic natural waters

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