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An experimental study of nanoflagellate bacterivory Rev. Microbiol.
Fernandes,Ana Júlia; Mesquita,Hilda de Souza Lima.
Heterotrophic nanoflagellate Pseudobodo tremulans (4.8 to 7.0 µm) and heterotrophic bacteria, isolated from coastal waters in Ubatuba, SP, Brazil, were used in experiments to analyze quantitatively the relationships between bacteria and nanoflagellates. The meaning of these results for the role of heterotrophic nanoflagellates in the Ubatuba coastal ecosystem is discussed.
Tipo: Info:eu-repo/semantics/other Palavras-chave: Nanoflagellate; Heterotrophic bacteria; Coastal ecosystem; Bacterivory.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37141999000400014
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Climate Change Influences Carrying Capacity in a Coastal Embayment Dedicated to Shellfish Aquaculture ArchiMer
Guyondet, T.; Comeau, L. A.; Bacher, Cedric; Grant, J.; Rosland, R.; Sonier, R.; Filgueira, R..
A spatially explicit coupled hydrodynamic-biogeochemical model was developed to study a coastal ecosystem under the combined effects of mussel aquaculture, nutrient loading and climate change. The model was applied to St Peter's Bay (SPB), Prince Edward Island, Eastern Canada. Approximately 40 % of the SPB area is dedicated to mussel (Mytilus edulis) longline culture. Results indicate that the two main food sources for mussels, phytoplankton and organic detritus, are most depleted in the central part of the embayment. Results also suggest that the system is near its ultimate capacity, a state where the energy cycle is restricted to nitrogen-phytoplankton-detritus-mussels with few resources left to be transferred to higher trophic levels. Annually, mussel...
Tipo: Text Palavras-chave: Climate change; Nutrient loading; Mussel culture; Carrying capacity; Coastal ecosystem; Numerical modelling.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00275/38624/37191.pdf
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Dynamics of particulate organic matter delta N-15 and delta C-13 during spring phytoplankton blooms in a macrotidal ecosystem (Bay of Seine, France) ArchiMer
Savoye, N; Aminot, Alain; Treguer, Paul; Fontugne, M; Naulet, N; Kerouel, Roger.
Two cruises (April and June 1997) were carried out in the Bay of Seine, a nitrate- and ammonium-enriched ecosystem of Western Europe, to identify the major mechanisms that control delta(15)N and VC in spring particulate organic matter (POM). Particulate organic nitrogen (PON) delta(15)N ranged between 0.8 and 5.2parts per thousand in April and between 2.2 and 6.2parts per thousand in June, while particulate organic carbon (POC) delta(13)C ranged between -24.3 and -19.7parts per thousand, and between -20.0 and -16.2parts per thousand during the same periods. During spring 1997, POM was highly dominated by autochthonous phytoplankton. It is shown that the variation of PON delta(15)N is due to both nitrate mixing between river and marine waters and...
Tipo: Text Palavras-chave: C and N stable isotopes; Phytoplankton; Coastal ecosystem; Nitrate utilization; Bay of Seine.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00000/10645/7593.pdf
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Geographic distribution of Atta robusta Borgmeier (Hymenoptera: Formicidae) Neotropical Entomology
Teixeira,Marcos C.; Schoereder,José H.; Mayhé-Nunes,Antônio J..
The available information regarding the geographic distribution of Atta robusta Borgmeier is confused and raised the necessity of revision of both its distribution and its endemic status. This paper ascertained the occurrence of A. robusta in restingas of Espírito Santo and Rio de Janeiro states, Brazil, through fieldwork, museum visits and bibliographical revision. No reference mentioned its occurrence out of restinga vegetation, as well as in states located south of Rio de Janeiro. We confirmed that A. robusta is endemic of restinga vegetation and it is restricted to the strip of the denominated Moist Oriental Tertiary Brazilian Coast. Such a distribution is possibly due to geographical and ecological barriers that obstruct its dispersion to other...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Leaf-cutting ant; Endemic occurence; Coastal ecosystem.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2003000400026
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Impacts of high-nitrate freshwater inputs on macrotidal ecosystems. I. Seasonal evolution of nutrient limitation for the diatom-dominated phytoplankton of the Bay of Brest (France) ArchiMer
Del Amo, Yolanda; Le Pape, Olivier; Treguer, Paul; Queguiner, Bernard; Menesguen, Alain; Aminot, Alain.
The chemical factors (inorganic nitrogen, phosphate, silicic acid) that potentially or actually control primary production were determined for the Bay of Brest, France, a macrotidal ecosystem submitted to high-nitrate-loaded freshwater inputs (winter nitrate freshwater concentrations >700 mu M, Si:N molar ratio as low as 0.2, i.e. among the lowest ever published). Intensive data collection and observations were carried out from February 1993 to March 1994 to determine the variations of physical [salinity, temperature, photosynthetically active radiation (PAR), freshwater discharges] and chemical (oxygen and nutrients) parameters and their impacts on the phytoplankton cycle (fluorescence, pigments, primary production). With insufficient PAR the winter...
Tipo: Text Palavras-chave: Coastal ecosystem; Phytoplankton dynamics; Macrotidal; Nutrient limitation; Silicon; Eutrophication.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/00337/44782/44588.pdf
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Influence of environmental and anthropogenic factors on the composition, concentration and spatial distribution of microplastics: A case study of the Bay of Brest (Brittany, France) ArchiMer
Frere, L.; Paul-pont, I.; Rinnert, Emmanuel; Petton, Sebastien; Jaffre, J; Bihannic, Isabelle; Soudant, P.; Lambert, C.; Huvet, Arnaud.
The concentration and spatial distribution of microplastics in the Bay of Brest (Brittany, France) was investigated in two surveys. Surface water and sediment were sampled at nine locations in areas characterized by contrasting anthropic pressures, riverine influences or water mixing. Microplastics were categorized by their polymer type and size class. Microplastic contamination in surface water and sediment was dominated by polyethylene fragments (PE, 53–67%) followed by polypropylene (PP, 16–30%) and polystyrene (PS, 16–17%) microparticles. The presence of buoyant microplastics (PE, PP and PS) in sediment suggests the existence of physical and/or biological processes leading to vertical transfer of lightweight microplastics in the bay. In sediment (upper...
Tipo: Text Palavras-chave: Microplastic; Coastal ecosystem; Surface water; Sediment; Raman spectroscopy; Hydrodynamic; Dispersal particle modelling.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00379/48994/51083.pdf
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Matter turnover in the oligotrophic restinga ecosystem and the importance of the key species Clusia hilariana Biota Neotropica
Brito,Letícia da Silva; Irmler,Ulrich; Forte,Bruno Vasconcelos Guimarães; Xavier,Tatiane Pereira; Martins,Rodrigo Lemes.
Abstract: Restingas are sandy areas spread along the Brazilian coast made up of a mosaic of forest and open woodland vegetation adapted to varying conditions of aridity, oligotrophy and salinity. Two vegetation types are very common in southeast Brazilian restingas, open Clusia formations and seasonally dry forest formation. Litter production and nutrient (C and N) turnover were studied comparatively in forest formations and Clusia formations, in vegetation patches with and without Clusia hilariana. The results showed that the breakdown process is extremely retarded in Clusia formations, with or without C. hilariana, leading to C accumulation in the soil. Microbial and soil fauna activity is lower in Clusia formations in comparison to forest formations;...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coastal ecosystem; Decomposition litterfall; Nutrient cycling; Nurse plant.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032018000400208
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Microplastic bacterial communities in the Bay of Brest: Influence of polymer type and size ArchiMer
Frere, Laura; Maignien, Lois; Chalopin, Morgane; Huvet, Arnaud; Rinnert, Emmanuel; Morrison, Hilary; Kerninon, Sandrine; Cassone, Anne-laure; Lambert, Christophe; Reveillaud, Julie; Paul-pont, Ika.
Microplastics (<5 mm) exhibit intrinsic features such as density, hydrophobic surface, or high surface/volume ratio, that are known to promote microbial colonization and biofilm formation in marine ecosystems. Yet, a relatively low number of studies have investigated the nature of microplastic associated bacterial communities in coastal ecosystems and the potential factors influencing their composition and structure. Here, we characterized microplastics collected in the Bay of Brest by manual sorting followed by Raman spectroscopy and studied their associated bacterial assemblages using 16S amplicon high-throughput sequencing. Our methodology allowed discriminating polymer type (polyethylene, polypropylene and polystyrene) within small size ranges...
Tipo: Text Palavras-chave: Bacteria; Microplastics; Coastal ecosystem; Metabarcoding; Vibrios.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00449/56082/57614.pdf
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Occurrence of Atta robusta Borgmeier (Hymenoptera: Formicidae) in the north of Espírito Santo State, Brazil Neotropical Entomology
Teixeira,Marcos C.; Schoereder,José H.; Louzada,Júlio N.C..
Atta robusta Borgmeier has been described as an endemic species from the lowlands of Rio de Janeiro State. However, the scarce studies carried out with species disagree in relation to its geographic distribution. In this note we describe the occurrence of A. robusta in the "restingas" of Guriri Island, north of Espírito Santo State. This occurrence makes clear that A. robusta is not endemic from Rio de Janeiro State, being distributed at least in "restingas" in Rio de Janeiro and Espírito Santo states.
Tipo: Info:eu-repo/semantics/report Palavras-chave: Leaf-cutting ant; Endemism; Coastal ecosystem.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2004000200019
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Restinga forests of the Brazilian coast: richness and abundance of tree species on different soils Anais da ABC (AABC)
Magnago,Luiz F.S.; Martins,Sebastião V.; Schaefer,Carlos E.G.R.; Neri,Andreza V..
The aim of this study was to determine changes in composition, abundance and richness of species along a forest gradient with varying soils and flood regimes. The forests are located on the left bank of the lower Jucu River, in Jacarenema Natural Municipal Park, Espírito Santo. A survey of shrub/tree species was done in 80 plots, 5x25 m, equally distributed among the forests studied. We included in the sampling all individuals with >3.2 cm diameter at breast height (1.30 m). Soil samples were collected from the surface layer (0-10 cm) in each plot for chemical and physical analysis. The results indicate that a significant pedological gradient occurs, which is influenced by varying seasonal groundwater levels. Restinga forest formations showed...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Vegetation; Flooded Forests; Coastal ecosystem; Sandy Soils; Quaternary deposits; Marine influence; Riparian forests.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300023
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The effects of a strong winter storm on physical and biological variables at a shelf site in the Mediterranean ArchiMer
Gremare, A; Amouroux, Jm; Cauwet, G; Charles, F; Courties, C; De Bovee, F; Dinet, A; Devenon, Jean-luc; Durrieu De Madron, X; Ferre, B; Fraunie, P; Joux, F; Lantoine, F; Lebaron, P; Naudin, Jj; Palanques, A; Pujo-pay, M; Zudaire, L.
A survey involving both permanent mooring and high frequency sampling was carried in the Bay of Banyuls-sur-Mer during the fall of 1999 to assess the effect of strong and unpredictable meteorological events on the functioning of a coastal Mediterranean ecosystem. A severe winter storm took place on 12 November, which generated waves with a significant height of 7 m and a sea surface rise of about 0.5 m. The near-bottom current speed at 24 m reached 30 cm s(-1). This storm induced a significant increase in total suspended matter through resuspension and then a subsequent increase in gross sedimentation rates. It also resulted in an increase of the proportion of refractory particulate organic matter in the water column. It also tended to increase nutrient...
Tipo: Text Palavras-chave: Impact à une tempête; Méditerranée nord-occidentale; Ecosystème côtier; Impact of storm; NW Mediterranean Sea; Coastal ecosystem.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00321/43265/42996.pdf
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Zebra Mussel Farming in the Szczecin (Oder) Lagoon: Water-Quality Objectives and Cost-Effectiveness Ecology and Society
Schernewski, Gerald; Leibniz-Institute for Baltic Sea Research; schernewski@eucc-d.de; Stybel, Nardine; EUCC - The Coastal Union Germany; stybel@eucc-d.de; Neumann, Thomas; Leibniz-Institute for Baltic Sea Research; thomas.neumann@io-warnemuende.de.
The Oder (Szczecin) Lagoon in the southern Baltic Sea is a heavily eutrophicated and degraded coastal ecosystem. We applied a systems approach framework to critically evaluate whether existing water-management measures achieve water-quality objectives for the river and lagoon systems. Our simulations reveal that the existing water-quality objectives for the river and the coastal waters are not sufficiently complementary. We suggest new water-quality threshold concentrations, which are in agreement with the European Water Framework Directive, and we calculate acceptable maximum nutrient loads for the Oder River. These calculations suggest that external nutrient-load reductions in the river basin alone seem insufficient to achieve good water quality in the...
Tipo: Peer-Reviewed Reports Palavras-chave: Baltic Sea Action Plan; Coastal ecosystem; Cost-benefit analysis; ERGOM; Eutrophication; Marginal costs; Mussel farming; Nitrogen; Oder Lagoon; Oder River; Phosphorus; Szczecin Lagoon; Water Framework Directive; Water management; Water quality; Zebra mussels (Dreissena polymorpha).
Ano: 2012
Registros recuperados: 12
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