Bacterial and Phytoplankton Production in Two Coastal Systems Influenced by Distinct Eutrophication Processes

Guenther, Mariana; Valentin, Jean Louis

doi:10.4257/oeco.2008.1201.15

Cited by 13 publications

(7 citation statements)

References 11 publications

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“…This leads to serious environmental and human health problems: the rate of water-transmitted diseases is quite high (although sanitation has improved in Brazil, still circa 65% of hospitalizations are due to water-transmitted diseases) ( Brasil, 2005 ). Microbes entering the bay also end up affecting other aquatic species and the ecosystem ( Paranhos et al, 1995 , 2001 ; Valentin et al, 1999 ; Guenther and Valentin, 2008 ; Gregoracci et al, 2012 ; Coutinho et al, 2014 ).…”

Section: Potentially Pathogenic and Harmful Microorganismsmentioning

confidence: 99%

“…The presence of pathogenic microorganisms in Guanabara Bay is undeniable. Among these microorganisms, the abundance, diversity and dominance of bacteria has been more thoroughly studied ( Paranhos et al, 1998 , 2001 , Guenther and Valentin, 2008 ; Gregoracci et al, 2012 ; Coutinho et al, 2014 ). On the other hand, the lack of information about virus clearly indicates the necessity of more complete and systematic studies.…”

Section: Potentially Pathogenic and Harmful Microorganismsmentioning

confidence: 99%

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Environmental and Sanitary Conditions of Guanabara Bay, Rio de Janeiro

et al. 2015

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Guanabara Bay is the second largest bay in the coast of Brazil, with an area of 384 km2. In its surroundings live circa 16 million inhabitants, out of which 6 million live in Rio de Janeiro city, one of the largest cities of the country, and the host of the 2016 Olympic Games. Anthropogenic interference in Guanabara Bay area started early in the XVI century, but environmental impacts escalated from 1930, when this region underwent an industrialization process. Herein we present an overview of the current environmental and sanitary conditions of Guanabara Bay, a consequence of all these decades of impacts. We will focus on microbial communities, how they may affect higher trophic levels of the aquatic community and also human health. The anthropogenic impacts in the bay are flagged by heavy eutrophication and by the emergence of pathogenic microorganisms that are either carried by domestic and/or hospital waste (e.g., virus, KPC-producing bacteria, and fecal coliforms), or that proliferate in such conditions (e.g., vibrios). Antibiotic resistance genes are commonly found in metagenomes of Guanabara Bay planktonic microorganisms. Furthermore, eutrophication results in recurrent algal blooms, with signs of a shift toward flagellated, mixotrophic groups, including several potentially harmful species. A recent large-scale fish kill episode, and a long trend decrease in fish stocks also reflects the bay’s degraded water quality. Although pollution of Guanabara Bay is not a recent problem, the hosting of the 2016 Olympic Games propelled the government to launch a series of plans to restore the bay’s water quality. If all plans are fully implemented, the restoration of Guanabara Bay and its shores may be one of the best legacies of the Olympic Games in Rio de Janeiro.

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Section: Potentially Pathogenic and Harmful Microorganismsmentioning

confidence: 99%

Section: Potentially Pathogenic and Harmful Microorganismsmentioning

confidence: 99%

Environmental and Sanitary Conditions of Guanabara Bay, Rio de Janeiro

et al. 2015

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“…It is likely that reproduction and coastal recruitment of Chilomycterus s. spinosus is facilitated by the increased primary production of the system (Guenther & Valentin 2008), marked by increased continental drainage which reaches the neritic zone during the austral summer, as proposed by BarlettaBergan et al (2002) for the tropical Caeté estuary (01°S). The burrfish use the estuary as a nursery until they reach the size at first maturity.…”

Section: Biotic Factorsmentioning

confidence: 91%

“…The high phytoplankton production in the bay (Guenther & Valentin 2008) may lead to larger populations of species throughout the trophic spectrum. Nevertheless, the availability of resources can become limiting to population growth because it depends on the population sizes of the species that compose the diet of the burrfish.…”

Section: Biotic Factorsmentioning

confidence: 99%

Population explosion of the burrfishChilomycterus spinosus spinosus(Diodontidae, Tetraodontiformes) in a eutrophic tropical estuary

Santos

Andrade

Verani

et al. 2015

Marine Biology Research

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Guanabara Bay is one of the most ecologically, economically and socially important tropical estuaries in the southwestern Atlantic. Fortnightly samples of the demersal ichthyofauna were obtained from July 2005 to June 2007, by bottom trawling from six stations determined according to the water quality. The net was 7 m long with a 14 m wide mouth and a mesh size of 18 mm. The tows were made at a speed of about 1.5 knots. The most abundant species, occurring in all 48 surveys, was Chilomycterus s. spinosus (14,837 specimens; 61.8 ind/h; 3.85 kg/h). Although commonly captured in Brazilian bays, this species has never been found in such high abundance and wide L T ranges (2.635.6 cm). The fish were concentrated in the middle portion of the estuary, which shows their high tolerance to eutrophic conditions, as well as to natural variations in temperature and salinity. In the last quarter of the study, the relative abundance levels rose to 228 ind/h, mostly small specimens of about 8.0 cm L T and 40 g M T , comprising 45% of the total catch. Such a successful recruitment could cause a large shift in species composition in the demersal community, with unpredictable ecological consequences. The population fluctuations of this species coincided with the rainfall pattern; the estuary is used as a nursery area until the fish reach the size at first maturity.

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“…The high and continuous input of allochthonous nutrients and organic material from the surrounding lands and the domestic sewage leads to high phytoplankton and bacterial growth (BARRERA-ALBA et al, 2008;GAULKE et al, 2010;VALENTIN, 2008b;MORTAZAVI et al;SCHUMANN et al, 2003;YUAN et al, 2010). However, most of estuarine BGE in situ estimates were performed in temperate zones, with few exceptions on the tropics (GUENTHER et al, 2008a;LEE et al, 2009;RAM et al, 2003;RAM et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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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Bacterial and Phytoplankton Production in Two Coastal Systems Influenced by Distinct Eutrophication Processes

Cited by 13 publications

References 11 publications

Environmental and Sanitary Conditions of Guanabara Bay, Rio de Janeiro

Environmental and Sanitary Conditions of Guanabara Bay, Rio de Janeiro

Population explosion of the burrfishChilomycterus spinosus spinosus(Diodontidae, Tetraodontiformes) in a eutrophic tropical estuary

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

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