Consulta: subjectFacets:"Estuary"
Registros recuperados: 105
Data/hora: 13/06/2024 05:10:21

Nitrogen Source Apportionment for the Catchment, Estuary, and Adjacent Coastal Waters of the River Scheldt
Provedor de dados: 7
Autores: Vermaat, Jan E; Earth Sciences and Economics, Faculty of Earth and Life Sciences, VU University; j.e.vermaat@vu.nl; Broekx, Steven; Flemish Institute for Technological Research (VITO); steven.broekx@vito.be; Van Eck, Bert; Deltares; Bert.vanEck@deltares.nl; Engelen, Guy; Flemish Institute for Technological Research (VITO); guy.engelen@vito.be; Hellmann, Fritz; Institute for Environmental Studies (IVM), VU University; f.a.hellmann@vu.nl; De Kok, Jean Luc; Flemish Institute for Technological Research (VITO); Jean-Luc.DeKok@vito.be; Van der Kwast, Hans; Flemish Institute for Technological Research (VITO); hans.vanderkwast@vito.be; Maes, Joachim; Joint Research Centre-European Commission; joachim.maes@jrc.ec.europa.eu; Salomons, Wim; Institute for Environmental Studies (IVM), VU University; wim.salomons@home.nl; Van Deursen, Willem; PCRaster; willem@pcraster.nl.
Using the systems approach framework (SAF), a coupled model suite was developed for simulating land-use decision making in response to nutrient abatement costs and water and nutrient fluxes in the hydrological network of the Scheldt River, and nutrient fluxes in the estuary and adjacent coastal sea. The purpose was to assess the efficiency of different long-term water quality improvement measures in current and future climate and societal settings, targeting nitrogen (N) load reduction. The spatial-dynamic model suite consists of two dynamically linked modules:  PCRaster is used for the drainage network and is combined with ExtendSim modules for farming decision making and estuarine N dispersal. Model predictions of annual mean flow and total N...
Tipo: Peer-Reviewed Reports
Palavras-chave: Catchment hydrology; Coupled modeling; Estuary; Eutrophication; Land use; Systems analysis; Watershed nutrient loading.
Ano: 2012

Habitat Scale Mapping of Fisheries Ecosystem Service Values in Estuaries
Provedor de dados: 7
Autores: O&amp;#8217;Higgins, Timothy G.; Scottish Association for Marine Sciences; tim.ohiggins@gmail.com; Ferraro, Steven P.; U.S. Environmental Protection Agency;; Dantin, Darrin D.; U.S. Environmental Protection Agency;; Jordan, Steve J.; U.S. Environmental Protection Agency;; Chintala, Marnita M; U.S. Environmental Protection Agency;.
Little is known about the variability of ecosystem service values at spatial scales most relevant to local decision makers. Competing definitions of ecosystem services, the paucity of ecological and economic information, and the lack of standardization in methodology are major obstacles to applying the ecosystem-services approach at the estuary scale. We present a standardized method that combines habitat maps and habitat&amp;#8211;faunal associations to estimate ecosystem service values for recreational and commercial fisheries in estuaries. Three case studies in estuaries on the U.S. west coast (Yaquina Bay, Oregon), east coast (Lagoon Pond, Massachusetts), and the Gulf of Mexico (Weeks Bay, Alabama) are presented to illustrate our method&amp;#8217;s...
Tipo: Peer-Reviewed Reports
Palavras-chave: Ecosystem services; Estuary; Habitat; Mapping; Valuation.
Ano: 2010

Особенности термохалинных параметров и ихтиоцена эстуария реки Чёрная (Севастопольская бухта)
Provedor de dados: 13
Autores: Карпова, Е. П.; Болтачёв, А. Р.; Данилюк, О. Н.
Приводятся результаты трёхлетних гидрологических и ихтиологических мониторинговых исследований верхней части Севастопольской бухты и устья реки Чёрная, представляющих квазистационарный эстуарий с выраженными значительными пространственно-временными колебаниями температуры и солёности. Список видов рыб специфического экотонного ихтиоцена, сформированного за счёт смешения рыб различного генезиса, насчитывает 39 видов из 19 семейств. Дана краткая характеристика каждого вида. Рассматриваются сезонные и пространственные изменения качественного и количественного состава, а также экологической структуры ихтиоцена в зависимости от абиотических факторов.
Tipo: Journal Contribution
Palavras-chave: Ихтиофауна; Температура и солёность воды; Эстуарий; Экотон; Экологическая структура; Іхтіоцен; Температура і солоність води; Естуарій; Екотон; Екологічна структура; Ichthyocenosis; Water temperature and salinity; Estuary; Ecotone; Ecological structure.
Ano: 2010
URL: http://repository.ibss.org.ua/dspace/handle/99011/1933

Impact of a power plant cooling system on copepod and meroplankton survival (Bahía Blanca estuary, Argentina)
Provedor de dados: 76
Autores: Hoffmeyer,Mónica Susana; Biancalana,Florencia; Berasategui,Anabella.
The impact of a power plant cooling system in the Bahía Blanca estuary (Argentina) on the survival of target zooplanktonic organisms (copepods and crustacean larvae) and on overall mesozooplankton abundance was evaluated over time. Mortality rates were calculated for juveniles and adults of four key species in the estuary: Acartia tonsa Dana, 1849 and Eurytemora americana Williams, 1906 (native and invading copepods), and larvae of the crab Chasmagnathus granulata Dana, 1851 and the invading cirriped Balanus glandula Darwin, 1854. Mean total mortality values were up to four times higher at the water discharge site than at intake, though for all four species, significant differences were only registered in post-capture mortality. The findings show no...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Copepods; Meroplankton; Estuary; Cooling system; Mortality.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212005000300011

Planktonic ciliates Choreotrichida and Strombidiida from the inner zone of Bahía Blanca Estuary, Argentina
Provedor de dados: 76
Autores: Pettigrosso,Rosa E.
Seven species of aloricate planktonic ciliates were identified using protargol staining. Choreotrichida: Strombidinopsidae, Strombidinopsis elongata Song &amp;amp; Bradbury, 1998; Strobiliidae, Strobilidium epacrum Lynn &amp;amp; Montagnes, 1988 and Strombidiida: Strombidiidae, Strombidium capitatum (Leegaard, 1915) Kahl, 1932; S. emergens (Leegaard, 1915) Kahl, 1932; S. acutum Leegaard, 1915; S. dalum Lynn, Montagnes &amp;amp; Small, 1988 and Cyrtostrombidium longisomum Lynn &amp;amp; Gilron, 1993; they were collected from the inner zone of the Bahía Blanca estuary in the southern region of the Buenos Aires province, Argentina. These species represent new records to South America (Argentina).
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Planktonic ciliates; Estuary; Distribution.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212003000200001

Seasonal variability on the structure of sublittoral macrozoobenthic association in the Patos Lagoon estuary, southern Brazil
Provedor de dados: 76
Autores: Colling,Leonir A.; Bemvenuti,Carlos E.; Gandra,Michel S.
The aim of this study is to analyze and relate the spatial-temporal variability of macrozoobenthic assemblages to bottom characteristics and salinity fluctuations, in an estuarine shallow water region of Patos Lagoon. Monthly samples, between September 2002 and August 2003, were taken on six sampling stations (distant 90 m). Three biological samples with a 10 cm diameter corer, one sample for sediment analysis, fortnightly bottom topography measurements, and daily data of temperature and salinity were taken from each station. Two biotic and environmental conditions were identified: the first corresponding to spring and summer months, with low macrozoobenthos densities, low values of salinity, small variations in bottom topographic level and weak...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seasonal variability; Benthos; Estuary; Abiotic variables; Sublittoral habitats.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212007000300007

Fish assemblage structure in a port region of the Amazonic coast
Provedor de dados: 76
Autores: Silva,Marcelo H. L.; Torres Júnior,Audálio R.; Castro,Antonio C. L.; Azevedo,James W. J.; Ferreira,Cássia F. C.; Cardoso,Rayssa L.; Nunes,Jorge L. S.; Carvalho-Neta,Raimunda N. F.
ABSTRACT: The fish assemblage structure in a port area in São Marcos Bay (Amazonic coast) was evaluated based on the spatial and temporal distributions to identify potential changes in response to anthropic pressure increases associated with industrial and port activities in region. The samples were taken between March 2011 and November 2015. The ichthyofauna was represented by a total of 56 species, distributed in 15 orders and 29 families. Captures were dominated by Genyatremus luteus (Bloch, 1790), but Sciades proops (Valenciennes, 1840) was the most representative in terms of biomass. Seasonal distributions of fish assemblage did not reveal significant differences. However, there was a difference between catch sites, abundance, biomass and Shannon...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ichthyofauna; Estuary; Seasonal variability; Spatial patterns; Maranhão Amazon.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212018000100218

Length–weight relations of 70 fish species (Actinopterygii) from tropical coastal region of Pernambuco, Northeast Brazil.
Provedor de dados: 5
Autores: Viana, Andrea P.; Lucena-fredou, Flavia; Menard, Frederic; Fredou, Thierry; Ferreira, Valdimere; Lira, Alex S.; Le Loch, Francois.
The presently reported study provides length-weight relations (LWR) of 70 fish species (Actinopterygii) from the tropical coastal region of Pernambuco, Northeast Brazil: Achirus declivis, Achirus lineatus, Anchoa spinifer, Anchoa tricolor, Anchovia clupeoides, Archosargus rhomboidalis, Aspistor luniscutis, Aspistor quadriscutis, Bagre bagre, Bagre marinus, Bairdiella ronchus, Bathygobius soporator, Carangoides bartholomaei, Caranx hippos, Caranx latus, Caranx ruber, Centropomus parallelus, Centropomus pectinatus, Centropomus undecimalis, Chaetodipterus faber, Chloroscombrus chrysurus, Citharichthys spilopterus, Conodon nobilis, Ctenogobius boleosoma, Cynoscion virescens, Diapterus auratus, Diapterus rhombeus, Engraulis anchoita, Etropus crossotus,...
Tipo: Text
Palavras-chave: Ichthyofauna; Estuary; Coast; Allometry; Tropical South Atlantic.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00359/47039/72975.pdf

Étude par télédétection de la dispersion en mer des eaux estuariennes issues de la Gironde et du Pertuis de Maumusson
Provedor de dados: 5
Autores: Castaing, P; Allen, Gp; Houdart, Michel; Moign, Y.
The objective of this study, carried out in the Gironde estuary inlet, was to determine the nature of the seaward dispersion of estuarine water and suspended sediments during a spring tide and high river flow. On June 3, 19(7, three flights were made over the inlet, at mid ebb, low tide and mid flood. The planned flight at high tide was cancelled due to adverse meteorological conditions. During each flight, thermal infrared coverage was obtained, together with black and white photographs. These data were correlated with concomitant ground mesures of current velocity, salinity, temperature and suspended sediment concentration Four types of water masses were identified during the tidal cycle: estuarine "very warm and turbid" water; estuarine "cooler and...
Tipo: Text
Palavras-chave: Hydrodynamique; Suspensions; Télédétection; Eaux côtières; Estuaire; Gironde; Hydrodynamic; Suspended sediments; Remote sensing; Coastal waters; Estuary; Gironde.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/00122/23361/21188.pdf

Environmental factors affecting maerl bed structure in Brittany (France)
Provedor de dados: 5
Autores: Dutertre, Mickael; Grall, Jacques; Ehrhold, Axel; Hamon, Dominique.
This study used a large spatial scale approach in order to better quantify the relationships between maerl bed structure and a selection of potentially forcing physical factors. Data on maerl bed structure and morpho-sedimentary characteristics were obtained from recent oceanographic surveys using underwater video recording and grab sampling. Considering the difficulties in carrying out real-time monitoring of highly variable hydrodynamic and physicochemical factors, these were generated by three-dimensional numerical models with high spatial and temporal resolution. The BIOENV procedure indicated that variation in the percentage cover of thalli can best be explained (correlation = 0.76) by a combination of annual mean salinity, annual mean nitrate...
Tipo: Text
Palavras-chave: Benthic habitats; Brittany; Environmental factors; Estuary; Large spatial scale; Maerl.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00280/39089/37816.pdf

Resource Competition Affects Plankton Community Structure; Evidence from Trait-Based Modeling
Provedor de dados: 5
Autores: Sourisseau, Marc; Le Guennec, Valerie; Le Gland, Guillaume; Plus, Martin; Chapelle, Annie.
Understanding the phenology of phytoplankton species is still a challenge and despite a lot of theoretical work on competition for ressources this process is under-represented in deterministic models. To study the main driver of the species selection, we thus used a trait-based model that keeps phenotypic variability through physiological trait parameterization. We next validate the results by using a key species, the toxic dinoflagellate Alexandrium minutum. Due to their monitoring, we show that harmful algae are ideal models for studying ecological niches and for contributing to this more global challenge. As a first step, a dimensionless model of an estuary (France) was built with water temperature and water exchanges deduced from a hydro-dynamic model....
Tipo: Text
Palavras-chave: Droop; Competition; Inter-specific; Estuary; Bay of Brest; Alexandrium minutum; Phenology; Niches.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00373/48414/48624.pdf

Cycle du mercure en estuaire, baie de Seine et pays de Caux
Provedor de dados: 5
Autores: Laurier, Fabien.
The Seine estuary and its adjacent region Pays de Caux are two significant sources of mercury for coastal marine environments. It is carried through fluvial means for the Seine bay and through karstic fresh water emergences for Pays de Caux's coastal area.  Mercury cycle in the Seine estuary and bay is affected by additional anthropical activities. The estuary's maximal turbidity area acts like a trap and a chemical reactor for fluvial mercury. Within this area, we can confirm: (i) the non conservative behaviour of dissolved mercury; (ii) mercury enrichment of particles when comparing the Seine's and marine environment and we suggest mercury particle redistribution from the organic fraction to the oxyhydroxydes fraction. A large fraction of mercury is...
Tipo: Text
Palavras-chave: Bay of Seine; Pays de Caux; Estuary; Coastal zone; Speciation; Bioavailability; Mercury; Pays de Caux; Seine; Estuaire; Emergence; Zone côtière; Spéciation; Biodisponibilité; Mercure.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/these-1842.pdf

Zooplankton metabolism in South African estuaries: does habitat type influence ecological strategies?
Provedor de dados: 5
Autores: Tagliarolo, Morgana; Porri, F; Garvie, C D; Lechman, K; Scharler, U M.
Zooplankton community composition, biomass and metabolism can vary drastically over space and time in subtropical estuaries. Changing environmental conditions can affect communities differently, depending on the characteristics of the species involved. In the present study, we compared the rates of oxygen consumption of the dominant zooplankton taxa living in permanently open and in temporally open/closed estuaries. The metabolic response was tested at four temperatures experienced by the animals in their natural environment. Zooplankton from the temporally open/closed estuary showed low activation energies and low rate of metabolism at the highest temperature tested. Animals from the permanently open estuary had higher respiration rates at increased...
Tipo: Text
Palavras-chave: Metabolism; Zooplankton; Respiration; Estuary; Thermal sensitivity.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00513/62425/66904.pdf

Etude des nourriceries de la baie de Seine orientale et de l'estuaire de la Seine. Synthese des connaissances.  Identification d'une nourricerie en estuaire de Seine. Analyse de la fonctionnalite de l'estuaire comme nourricerie
Provedor de dados: 5
Autores: Morin, Jocelyne; Riou, Philippe; Lemoine, Michel; Le Pape, Olivier; Bessineton, Christophe; Vedieu, Christophe; Simon, Serge.
The study carried out from 1995 to 1997 within the framework of "Le Havre" harbour extension project, concerned the description of halieutic populations and the characterization of a coastal nursery in the oriental part of the Seine bay and in the Seine estuary. The main objective was to describe the specific and demographic composition of marine populations as well as their spatio-temporal distribution, and then to assess the biologic and halieutic role of this area. The study also included a research about the dietary needs of fish juveniles living in the estuary. Methodology Five series of surveys were carried out in subtidal and intertidal zones. They were realised in autumn and winter, from September 1995 to March 1997, in an area extending from the...
Tipo: Text
Palavras-chave: Marine population; Halieutic; Biology; Estuary; Seine bay; Nursery.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/1999/rapport-1576.pdf

Detection and analysis of unusual events in long-term zooplankton and nekton data sets from North Inlet Estuary, South Carolina, USA
Provedor de dados: 5
Autores: Allen, Dm; Edwards, D; Feller, Rj; Hutchinson, Se; Ogburnmatthews, V.
Unusual events and disturbances are important sources of variability in ecological data sets, but methods for their detection and analysis are not readily available. We have adapted widely-used quality control methods to identify and quantify unusual events in ten-year-long data sets from the relatively pristine North Inlet Estuary, South Carolina, USA.-Seasonal patterns and long-term trends were first removed from biweekly zooplankton and nekton abundance and corresponding water temperature and salinity data using nonparametic smoothing algorithms. The Shewhart Control Chart Method, a quantitative technique used for quality control in industrial manufacturing processes, was used to define four types of events according to intensity and duration....
Tipo: Text
Palavras-chave: Zooplankton; Nekton; Estuary; Long-term; Disturbance.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00093/20389/18056.pdf

Spéciation des contaminants métalliques en milieu estuarien : Intérêt de la modélisation et application au cadmium
Provedor de dados: 5
Autores: Gonzalez, Jean-louis; Dange, Catherine; Thouvenin, Benedicte.
In estuarine environment, cadmium has a nonconservative behavior. It can be present under various species: dissolved (mineral and organic complexes), colloidal and particulate forms (adsorbed, precipitated), or integrated by various mechanisms in the organisms. This distribution is the result of processes (physical, chemical and biological) which are controlled by many factors (salinity, pH, Eh, nature and concentration of suspended matter, primary production). Geochemical modeling is a very useful approach to understand the dynamics of this type of contaminant, especially in the complex systems which are the estuaries. A speciation model was used to simulate the measurements taken (dissolved and particulate Cd) during various cruises carried out in the...
Tipo: Text
Palavras-chave: Cadmium; Estuary; Speciation; Modeling; Surface complexation; Cadmium; Estuaire; Spéciation; Modélisation; Complexation de surface.
Ano: 2001
URL: https://archimer.ifremer.fr/doc/00480/59120/61749.pdf

Les virus de l'estuaire de la Charente el du bassin de Marennes-Oleron. Dynamiques spatio-temporelles et  interactions avec les communautés bactériennes
Provedor de dados: 5
Autores: Auguet, Jean-christophe.
This study is divided in two parts; one aim is to evaluate the in situ spalio-temporal dynamics of viral communities  in the Charante estuary in order to define the appropriate seasons to conduct in vitro viral enrichment experiments. These experiments, that constitute the second part of this study, were performed to assess the impact of freshwater viruses carried by the Charante River on the dynamics and composition of coastal bacterial communities. With abundance ranging from 1.4 x 107 to 208 x I07 VLPml-1. viruses are the most abundant component among plankton microorganisms in surface waters of the Charente estuary. Thre temporal dynamics of this component reflects the indirect influence of temperature through the control of bacterial abundance,...
Tipo: Text
Palavras-chave: Richesse spécifique; Composition clonale; Enrichissement vital; Infection lyrique; Structure des communautés; MET; PPGE; Dynamique temporelle; Gradient de salinité; Estuaire; Bactérioplancton; Virioplancton; Species richness; Clonal composition; Viral enrichment; Lytic infection; Community structure; Diversity; TEM; PEGE; Temporal dynamic; Gradient; Salinity; Estuary; Bacterioplankton; Virioplankton.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/these-3071.pdf

Potential of UAVs for Monitoring Mudflat Morphodynamics (Application to the Seine Estuary, France)
Provedor de dados: 5
Autores: Jaud, Marion; Grasso, Florent; Le Dantec, Nicolas; Verney, Romaric; Delacourt, Christophe; Ammann, Jerome; Deloffre, Julien; Grandjean, Philippe.
Intertidal mudflats play a critical role in estuarine exchange, connecting marine and continental supplies of nutrients and sediments. However, their complex morphodynamics, associated with a wide range of physical and biological processes, are still poorly understood and require further field investigation. In addition, mudflats are challenging areas for Structure-from-Motion (SfM) photogrammetric surveys. Indeed, the mudflats generally hold back residual tidal water, which can make stereo restitution particularly difficult because of poor correlations or sun-glint effects. This study aims to show the potential of light UAVs (Unmanned Aerial Vehicles) for monitoring sedimentary hydrodynamics at different spatial scales in a silty estuary. For each UAV...
Tipo: Text
Palavras-chave: Coastal monitoring; Unmanned Aerial Vehicle; Photogrammetry; Estuary; Mudflat areas; Morphological features.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00326/43721/43167.pdf

Géochimie du mercure dans le continuum de la retenue de Petit-Saut et de l'estuaire du Sinnamary, Guyane française
Provedor de dados: 5
Autores: Muresan Paslaru, Bogdan.
The mercury cycle was explored in the Petit-Saut reservoir / Sinnamary Estuary continuum in French Guiana. Main processes involve (i) photo-induced reduction, (ii) adsorption and desorption at the particle surfaces, (iii) methylating bacterial activity, (iv) precipitation and dissolution of iron oxyhydroxides and sulfides. Sources of mercury to the Petit-Saut reservoir consist of the partly impacted river-tributaries, the atmospheric deposition and the flooded soils or vegetation. Once into the reservoir, divalent mercury undergoes a large spectrum of transformations including speciation and phase changes. We, here, probe these processes and demonstrate that the Petit-Saut reservoir behaves as a privileged site for atmospheric recycling and in situ...
Tipo: Text
Palavras-chave: Atmosphere; Estuary; Reservoir; French Guiana; Methylmercury; Mercury; Atmosphère; Estuaire; Retenue; Guyane française; Methylmercure; Mercure.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/these-1508.pdf

Modeling of Faecal Contamination in Water from Catchment to Shellfish Growing Area
Provedor de dados: 5
Autores: Bougeard, Morgane; Le Saux, Jean-claude; Perenne, Nicolas; Le Guyader, Soizick; Pommepuy, Monique.
During rainstorms, watersheds can introduce large amounts of faecal pollution into the rivers and sea, leading to shellfish contamination. In this study, we assessed Escherichia coli fluxes from a catchment, and their impact on estuarine water quality, using two assembled models. For the catchment, the agro-hydrological model SWAT was implemented integrating land uses, soil, topography, rainfall and other climatic data on Daoulas watershed (France). Initially, the SWAT model was calibrated and validated for river flow rates, and results were found satisfactory. Subsequently, different faecal contamination sources were integrated into the model: point sources (WWTP discharges into rivers) and non-point sources (manure spreading on fields). During rainfall...
Tipo: Text
Palavras-chave: Modeling; SWAT; MARS; E. coli; Shellfish; Catchment; Estuary.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00066/17748/15270.pdf

Mercury sources and transformations in a man-perturbed tidal estuary; the Sinnamary Estuary, French Guiana
Provedor de dados: 5
Autores: Muresan, B; Cossa, Daniel; Coquery, M; Richard, S.
The distribution, partition and speciation of mercury (Hg) were studied along the redox gradient of an anthropogenically perturbed tropical estuary, the Sinnamary Estuary in French Guiana. This system is a partially mixed estuary characterized by an anoxic freshwater end-member, while the marine end member consists of the Amazon Plume. The set up of an artificial oxygenation system in the anoxic freshwater end-member generates sharp gradients of major chemical species (iron, sulfides, etc.) coupled with intense organic matter (OM) turnover. The coexistence of oxygenated waters and dissolved sulfides in an organic rich environment depicts the Upper Sinnamary Estuary (USE: part of Sinnamary Estuary under the tidal influence but upstream of the salt...
Tipo: Text
Palavras-chave: Partitioning; Speciation; Redox; Mercury; Reservoir; Estuary.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4223.pdf

Impact du régime du barrage d'Arzal sur la stratification a l'embouchure de la Vilaine : étude par modélisation numérique
Provedor de dados: 5
Autores: Le Hir, Pierre; Duchene, C.; Merel, A; De Nadaillac, G.; Merceron, Michel; Breton, Marguerite.
The rate of flow of the fresh water releases at the Arzal Dam into the Vilaine is likely to influence the haline structure of Vilaine Bay. In order to determine the rate of flow that causes a minimum downstream stratification, a vertical two-dimensional mathematical modelling of the Vilaine's estuary was undertaken. We obtain very similar stratification flows for different fresh water release scenarios, in spite of the rather different desalinisations and currents.
Tipo: Text
Palavras-chave: Water release; Stratification; Estuary; Numerical model; Vilaine; Rejet de barrage; Stratification; Estuaire; Modèle numérique; Vilaine.
Ano: 1986
URL: https://archimer.ifremer.fr/doc/1986/rapport-2654.pdf

Forty questions of importance to the policy and practice of native oyster reef restoration in Europe
Provedor de dados: 5
Autores: Zu Ermgassen, Philine S. E.; Bonačić, Kruno; Boudry, Pierre; Bromley, Cass A.; Cameron, Tom C.; Colsoul, Bérenger; Coolen, Joop W. P.; Frankić, Anamarija; Hancock, Boze; Have, Tom M.; Holbrook, Zoë; Kamermans, Pauline; Laugen, Ane T.; Nevejan, Nancy; Pogoda, Bernadette; Pouvreau, Stephane; Preston, Joanne; Ranger, Christopher J.; Sanderson, William G.; Sas, Hein; Strand, Åsa; Sutherland, William J.
Oyster reefs are among the most threatened marine habitats globally. In Europe, oyster reefs have been extirpated from most locations within their historical range. Active restoration of the native oyster (Ostrea edulis) in Europe has grown substantially in recent years. In sharing experiences between oyster restoration projects in Europe at the Native Oyster Restoration Alliance conference, NORA2, in Edinburgh in May 2019, it became apparent that a number of similar barriers are experienced. This study identified the top 40 questions, which, if answered, would have the greatest influence on the policy and practice of oyster restoration in Europe. Initially 71 people were consulted across 28 institutions and 11 European countries to generate 194 questions....
Tipo: Text
Palavras-chave: Alien species; Estuary; Fishing; Invertebrates; Pollution; Restoration; Subtidal.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00658/77004/78261.pdf

Risk assessment of herbicides and booster biocides along estuarine continuums in the Bay of Vilaine area (Brittany, France)
Provedor de dados: 5
Autores: Caquet, Th.; Roucaute, M.; Mazzella, N.; Delmas, F.; Madigou, C.; Farcy, E.; Burgeot, Thierry; Allenou, Jean-pierre; Gabellec, Raoul.
A 2-year study was implemented to characterize the contamination of estuarine continuums in the Bay of Vilaine area (NW Atlantic Coast, Southern Brittany, France) by 30 pesticide and biocide active substances and metabolites. Among these, 11 triazines (ametryn, atrazine, desethylatrazine, desethylterbuthylazine, desisopropyl atrazine, Irgarol 1051, prometryn, propazine, simazine, terbuthylazine, and terbutryn), 10 phenylureas (chlortoluron, diuron, 1-(3,4-dichlorophenyl)-3-methylurea, fenuron, isoproturon, 1-(4-isopropylphenyl)-3-methylurea, 1-(4-isopropylphenyl)-urea, linuron, metoxuron, and monuron), and 4 chloroacetanilides (acetochlor, alachlor, metolachlor, and metazachlor) were detected at least once. The objectives were to assess the corresponding...
Tipo: Text
Palavras-chave: Estuary; Herbicides; Booster biocides; Species sensitivity distribution; Risk quotient; AtlanticCoast.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00124/23571/22554.pdf

Complexity in trophic structure and stability in a modelled West African estuary
Provedor de dados: 5
Autores: Villanueva, Ching-maria; Diouf, P.s.; Albaret, J.-j.; Moreau, J.
Un modèle Ecopath de l'estuaire du Sine-Saloum (Sénégal) comportant au total 37 groupes fonctionnels a été appliqué dans la présente étude en vue de déterminer les faits essentiels de ce système aquatique. La grande biodiversité spécifique des poissons de l'écosystème peut y jouer un rôle en assurant son intégrité, spécialement en présence de facteurs de stress, bien qu'il ait été observé que ce n'est pas entièrement le cas. Les résultats montrent qu'un autre facteur de mitigation est le niveau des forces d'interaction entre les groupes fonctionnels. La stabilité est accrue par des relations plus faibles et des pyramides plus courtes et plus larges. Bien que différentes questions se posent concernant les facteurs conduisant à la stabilité d'un système, les...
Tipo: Text
Palavras-chave: Stabilité des systèmes; Sénégal; Omnivorie; Estuaire; Ecosystème côtier; Ecopath; Biodiversité; Afrique de l'Ouest; West Africa; System Stability; Senegal; Omnivory; Estuary; Ecopath; Coastal Ecosystem; Biodiversity.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-2554.pdf

Phytoplankton production in the Tagus estuary (Portugal)
Provedor de dados: 5
Autores: Cabecadas, L.
Biomass and phytoplankton photosynthetic response were studied in the lower Tagus estuary weekly, and related to environmental conditions in February, March and April 1994. The Photosynthesis-Irradiance ((P-I)-I-B) relation was studied based on the light-saturated photosynthesis rate (P(B)m) and the light-limited initial slope (a(B)). The nutrient concentrations observed were high enough to be considered as not limiting phytoplankton growth. Tagus estuary phytoplankton seems, to a certain extent, adapted to high turbid conditions, being able to utilize the low light levels more efficiently, which was translated by high values of a(B) [0.10-0.20 mg C (mg Chl a)(-1) h(-1) (W m(-2))(-1)]; however, light seems to limit phytoplankton production in the water...
Tipo: Text
Palavras-chave: Production primaire; Phytoplancton; Estuaire; Biomasse; Turbidité; Primary production; Phytoplankton; Estuary; Biomass; Turbidity.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00325/43621/43310.pdf

Dynamics of an estuarine ecosystem: Long-term trends in the macrobenthic communities of Chesapeake bay, (1985-1993)
Provedor de dados: 5
Autores: Dauer, Dm.
Long-term trends in subtidal macrobenthic communities of the lower Chesapeake Bay, USA, were examined using data collected quarterly (March, June, September and December) fr om 1985 through 1993 at 16 stations along a salinity gradient from tidal freshwater regions of the major tributaries (James, York and Rappahannock rivers) to the polyhaline region of the mainstem of Chesapeake Bay. In March 1989 two stations were added to the program in the mesohaline region of the Southern Branch of the Elizabeth River, a region characterized by contaminated sediments. A non-parametric trend analysis procedure was applied to five parameters characterizing macrobenthic community structure: community biomass, species richness, abundance of individuals, proportion of...
Tipo: Text
Palavras-chave: Chesapeake Bay; Benthos; Trends; Estuary; Eutrophication.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00093/20399/18066.pdf

Sulfate-reducing bacteria [rom mangrove swamps II : Their ecology and physiology
Provedor de dados: 5
Autores: Bharathi, Pal; Oak, S; Chandramohan, D.
Sulfate-reducing bacteria (SRB) have been enumerated and physiologically characterized in three mangrove stations along the Zuari estuary. The substrates for counting were lactate, acetate, propionate, butyrate and benzoate. Benzoate oxidizing SRB were widespread and occurred in numbers up to 6.62 x 10(3)/g dry sediment. The next highest in number were lactate utilizing SRB. On an average there were more propionate and butyrate utilizers than acetate utilizers. While Agasaim at the mouth of the estuary harboured highest number of lactate oxidizers, none were detected at Mirabaug upstream during the samplings. The SRB shared many characteristics with Desulfovibrio desulfuricans, D. desulfuricans aestuarii, D. salexigens, Desulfotomaculum orientis, D....
Tipo: Text
Palavras-chave: Bactéries; Sulfato-réductrices; Estuaire; Sédiments; Mangrove; Mangrove-Bacteria; Sulfate-reducers; Estuary; Sediments.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/00323/43395/43103.pdf

Effect of local hydroclimate on phytoplankton groups in the Charente estuary
Provedor de dados: 5
Autores: Guesdon, Stephane; Stachowski-haberkorn, Sabine; Lambert, Christophe; Beker, Beatriz; Brach-papa, Christophe; Auger, Dominique; Bechemin, Christian.
This study aimed to describe seasonal variations of phytoplankton abundances in relation to the physical and chemical (nutrients and metals) environment under the influence of freshwater input in the Charente river estuary (Marennes-Oléron bay, France) over three years, from 2011 to 2014. Phytoplankton abundances were determined using microscopy and flow cytometry. Considering high frequency temperature and salinity data, breakpoints in each series led to the identification of two local hydroclimatic periods: the first (2011 and early 2012) being warmer and higher in salinity than the second (from spring 2012 to the beginning of 2014). A multiblock PLS analysis highlighted the significant contribution of the physical environment (temperature, salinity and...
Tipo: Text
Palavras-chave: Hydroclimate; Estuary; Phytoplankton; Size composition; Nutrients; Trace metals.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00349/46005/45674.pdf

La contamination de la Gironde par le cadmium : origine, extension, importance
Provedor de dados: 5
Autores: Boutier, Bernard; Chiffoleau, Jean-francois; Jouanneau, Jean-marie; Latouche, Claude; Philipps, Isabelle.
In 1979, the French monitoring program RNO (Réseau National d'Observation de la qualité du milieu Marin) pointed out a dramatic cadmium contamination in the oysters from the Gironde estuary (up to 100 ug -1, dry weight). The wild oyster-beds upstream the estuary were shown to be the most contaminated. This result tends to point to the river as the source of the cadmium contamination. At the same rime, uncontaminated oysters from Arcachon were transplanted in the Gironde estuary (La Fosse, Dau). This ex periment confirmed the importance and proved the permanence of the contamination. Very high concentrations of dissolved cadmium (400 ng. 1-1) were measured in the estuarine mixing zone. This phenomenon can be explained by the desorption of cadmiumfrom...
Tipo: Text
Palavras-chave: Cadmium; Désorption; Estuaire; Bilan géochimique; Contamination des huîtres; Cadmium; Desorption; Estuary; Geochemical budget; Oyster contamination.
Ano: 1989
URL: http://archimer.ifremer.fr/doc/00167/27820/26013.pdf

Long-term records of cadmium and silver contamination in sediments and oysters from the Gironde fluvial-estuarine continuum - Evidence of changing silver sources
Provedor de dados: 5
Autores: Lanceleur, Laurent; Schaefer, Joerg; Chiffoleau, Jean-francois; Blanc, Gerard; Auger, Dominique; Renault, Sophie; Baudrimont, Magalie; Audry, Stephane.
The Gironde fluvial estuarine system is impacted by historic metal pollution (e.g. Cd, Zn, Hg) and oysters (Crassostrea gigas) from the estuary mouth have shown extremely high Cd concentrations for decades. Based on recent work (Chiffoleau et al., 2005) revealing anomalously high Ag concentrations (up to 65 mg kg(-1); dry weight) in Gironde oysters, we compared long-term (similar to 1955-2001) records of Ag and Cd concentrations in reservoir sediment with the respective concentrations in oysters collected between 1979 and 2010 to identify the origin and historical trend of the recently discovered Ag anomaly. Sediment cores from two reservoirs upstream and downstream from the main metal pollution source provided information on (i) geochemical background...
Tipo: Text
Palavras-chave: Silver; Cadmium; Estuary; Oyster; Biomonitoring.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00060/17109/15071.pdf

Bacterial community structure along the Adour estuary (French Atlantic coast): influence of salinity gradient versus metal contamination
Provedor de dados: 5
Autores: Goni-urriza, M. S.; Point, D.; Amouroux, D.; Guyoneaud, R.; Donard, O. F. X.; Caumette, P.; Duran, R.
Salinity, other physico-chemical parameters and anthropogenic pollution are the main factors affecting bacterial communities in estuaries. We estimated the impact of these parameters on the distribution of bacterial communities in the Adour estuary (France), a moderately Polluted water body characterized by short residence times of particles and water and absence of a maximum turbidity zone. Eight stations were established along the salinity gradient from freshwater to marine conditions. For the 3 typical estuarine stations (water mixing zone), samples were collected at both low and high tide and at different depths according to the position of the halocline. This sampling strategy generated 35 samples with different degrees of mixing between fresh water...
Tipo: Text
Palavras-chave: Bacterial communities; Salinity gradient; Heavy metals; Estuary; Halocline; T-RFLP.
Ano: 2007
URL: https://archimer.ifremer.fr/doc/00249/35983/34517.pdf

Transformation de la phase solide à travers l’estuaire de la Loire en relation avec son environnement chimique et biologique
Provedor de dados: 5
Autores: Thibault De Chanvalon, Aubin.
Before reaching the ocean, riverine particles from the Loire watershed undergo important chemical transformations in the estuary. This study aims to identify and characterize main processes involving iron (and to a lesser extent Al, Mn, PO4 3- and rare earths elements). Suspended particulate matter data show that 15% of their iron is lost through the estuary. Reductive iron dissolution during deposition periods is likely to explain most of this loss. However, estuarine sediments are characterized by high spatial heterogeneity due to macrofaunal activities. To overcome this difficulty, new methodologies of high resolution and two-dimensional analyses and calculation of pore water, sediment and benthic meiofauna were developed. These developments enable to...
Tipo: Text
Palavras-chave: Estuaire; Fer; Phosphore; Nitrate; Foraminifère benthique; Diagenèse précoce; Loire; Bioturbation; Estuary; Iron; Phosphorus; Nitrate; Benthic foraminifera; Precocious diagenesis; Loire; Bioturbation.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00498/60932/64325.pdf

Metabarcoding on planktonic larval stages: an efficient approach for detecting and investigating life cycle dynamics of benthic aliens
Provedor de dados: 5
Autores: Couton, Marjorie; Comtet, Thierry; Le Cam, Sabrina; Corre, Erwan; Viard, Frédérique.
High-throughput sequencing (HTS) technologies offer new promise to support surveillance programs targeting marine non-indigenous species (NIS). Metabarcoding might surpass traditional monitoring methods, for example through its ability to detect rare species, a key feature in early detection of NIS. Another interest of this approach is the identification of organisms difficult to identify based on morphology only (e.g., early developmental stages), making it relevant in the context of management programs. Because many marine benthic NIS have a biphasic benthopelagic life cycle, targeting their pelagic larval stages in zooplankton may allow early detection and assessment of their establishment and potential spread. We illustrate this approach with an...
Tipo: Text
Palavras-chave: Zooplankton; Time-series; Non-indigenous species; Estuary; High-throughput sequencing; Surveillance; Monitoring.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00599/71127/69442.pdf

Evaluation de l’état écologique des masses d’eau de transition dans le cadre de la DCE. Etude de la pertinence du suivi des peuplements du microphytobenthos estuarien
Provedor de dados: 5
Autores: Ribeiro, Lourenço; Le Bris, Anthony; Hernandez Farinas, Tania; Buchet, Remi; Dutertre, Mickaël; Metzger, Edouard; Rosa, Philippe; Gernez, Pierre; Lerouxel, Astrid; Barille, Laurent.
In order to establish the ecological status of water bodies, the European Water Framework Directive (WFD) is based on the evaluation of a number of biological quality elements, as well as physical parameters supporting the biology. In estuaries, phytoplankton monitoring was not considered relevant because of the high turbidity characterizing the large metropolitan estuaries and the French overseas departments (Guyana). In this work, we considered the possibility of using microphytobenthos (MPB) as a biological indicator of the ecological status of estuaries. This activity report summarizes the actions undertaken in 2017 under an AFB / Université de Nantes convention, which is structured around two main axes: the first axis is based on the analysis of the...
Tipo: Text
Palavras-chave: DCE; Diatomées benthiques; Diversité; Estuaires; Facteurs naturels; Gradient de perturbation; Loire; Bio-indication; Microphytobenthos; Pressions anthropiques; Télédétection.; Anthropogenic pressures; Benthic diatoms; Bio-indication; Diversity; Estuary; Loire; Microphytobenthos; Natural factors; Perturbation gradient; Remote sensing; WFD.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00446/55725/57376.pdf

Integrating the effects of salinity on the physiology of the eastern oyster, Crassostrea virginica, in the northern Gulf of Mexico through a Dynamic Energy Budget model
Provedor de dados: 5
Autores: Lavaud, Romain; La Peyre, Megan K.; Casas, Sandra M.; Bacher, Cedric; La Peyre, Jerome F.
We present a Dynamic Energy Budget (DEB) model for the eastern oyster, Crassostrea virginica, which enables the inclusion of salinity as a third environmental variable, on top of the standard foodr and temperature variables. Salinity changes have various effects on the physiology of oysters, potentially altering filtration and respiration rates, and ultimately impacting growth, reproduction and mortality. We tested different hypotheses as to how to include these effects in a DEB model for C. virginica. Specifically, we tested two potential mechanisms to explain changes in oyster shell growth (cm), tissue dry weight (g) and gonad dry weight (g) when salinity moves away from the ideal range: 1) a negative effect on filtration rate and 2) an additional...
Tipo: Text
Palavras-chave: DEB theory; Bioenergetics; Filtration; Maintenance; Growth; Estuary; Louisiana.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00400/51137/53773.pdf

Etude des apports en herbicides et en nutriments par la Charente : Modélisation de la dispersion de l'atrazine dans le bassin de Marennes-Oléron
Provedor de dados: 5
Autores: Munaron, Dominique.
Our study aims at making progress the estimate of herbicide and nutrient inputs to the Marennes-Oleron bay which could influence summer oysters mortalities, and to bring by modeling a better understanding of the dynamics of these compounds in the shellfish-farming area. The development of a strategy adapted to the Charente river and its estuary reveals that agricultural activity on the catchment area is omnipresent, as well on the level of the nitrogen and herbicides contributions. It is thus necessary to specify Charente fluxes, which is the main tributary of the Marennes-Oleron bay, in order to better characterize its impact on shellfishfarming activity. Use of a dispersion model will constitute an invaluable help in the risk assessment with respect to...
Tipo: Text
Palavras-chave: Atlantic coast; Marennes Oléron Bay; Modelisation; Estuary; Geochemistry behaviour; Charente River; Flux; Nutrient; Herbicide; Littoral Atlantique; Bassin de Marennes Oléron; Modélisation; Estuaire; Comportement Géochimique; Charente; Flux; Nutriments; Herbicides.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/these-2266.pdf

Etat de la pollution par les hydrocarbures dans l'Aber Benoit
Provedor de dados: 5
Autores: Allen, G.; D'Ozouville, Laurent; L'Yavanc, Jacky.
The Aber Benoît, a small estuary on the North West coast of Brittany was polluted by oil from the Amoco Cadiz oil spill. Preliminary results from water and sediment samples taken in the estuary in May 1978, show that two months after the initial spill, high concentrations of hydrocarbures existed in the water and sediments of the estuary. The Aber Benoît shows a well developed salt wedge and upstream increasing suspended sediment concentrations. Oil was dispersed more or less evenly throughout the water column, in the entire length of the estuary. In the bottom sediments, oil had accumulated to depths of 30 cm. Sand bars appear to induce a trapping of oil in the estuary channel.
Tipo: Text
Palavras-chave: Estuaire; Sédiment; Pollution Hydrocarbures; Estuary; Sediment; Oil spill.
Ano: 1978
URL: http://archimer.ifremer.fr/doc/00306/41721/40932.pdf

The effect of tidal range on the flushing of ammonium from intertidal sediments of the Tagus estuary, Portugal
Provedor de dados: 5
Autores: Cabrita, Mt; Catarino, F; Vale, C.
The time-course evolution of ammonium concentration has been examined in the flood water during the first 25 min of tidal inundation. The way this transport fluctuates with the tidal ranges and wind conditions was investigated. Flood water was collected at three sites, located along a transect from the lower to the upper intertidal area of the Tagus estuary. At spring and intermediate tides, the periods of air exposure vary slightly along the transect due to the high tidal amplitude and the flatness of the area, but the upper site remains uncovered at neap tide over the entire tidal cycle. At each site, sampling was performed at different tidal ranges covering the neap-spring tidal cycle and wind conditions. Ammonium was determined in the flood water at...
Tipo: Text
Palavras-chave: Extraction par la marée; Ammonium; Sédiment intertidal; Estuaire; Tidal flushing; Ammonium; Intertidal sediments; Estuary.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00325/43611/43908.pdf

Modelling mud transport in a macrotidal estuary
Provedor de dados: 5
Autores: Le Hir, Pierre; Bassoullet, Philippe; L'Yavanc, Jacky.
In order to determine the fate of the fine particles and adsorbed contaminants in·a short macrotidal èstuary, a mathematical modelling system for cohesive suspended mater transport and bottom evolution, including a new consolidation algorithm, is developed. An analysis of successive erosion, transport and deposi~ion processes due to tidal forcing is given and comparisons with field data are provided. A description of mean-term bottom variations has been attempted and is partially validated by differential soundings.
Tipo: Text
Palavras-chave: Dynamique des sédiments cohésifs; Estuaire Morlaix; Tassement des vases; Modèle mathématique; Érosion; Dépôt; Cohesive sediment dynamics; Estuary; Erosion; Deposition; SoiT consolidation; Mathematical modelling.
Ano: 1988
URL: https://archimer.ifremer.fr/doc/00682/79379/81909.pdf

Les prises accessoires de la pêcherie de civelles (Anguilla anguilla) dans l'estuaire de la Loire en 1987
Provedor de dados: 5
Autores: Guerault, Daniel; Desaunay, Yves; Bellois, Pierre; Grellier, Patrick; Robin, Jean-paul; Robineau, Brigitte.
A survey of the glass-eel fishery in the Loire estuary in 1987 (265 boats, 117 tons gasseel, 13733 fishing trips) showed that 16 fishery species constitute the by-catch (49,3 million individuals, mainly juveniles, among which 98 % consist in flounder, sprat and brown shrimp). The analysis of catches in space and time leads to proposaIs for Iimiting the impact during the last fishing weeks. Taking into account the naturai mortality rates of the concerned juveniles, an attempt is made to estimate the actuai impact of the glasseel fishery, after a delay. Only 10 % of the caught brown shrimps wouid have been recruited in the summer shrimp fishery. Up to 85,5 to 97,6 % of juvenile fishes would have disappeared during the following year by natural mortality.
Tipo: Text
Palavras-chave: Anguille; Pêcherie; Prises accessoires; Estuaire; Loire; Eel; Fishery; By catch; Estuary; Loire.
Ano: 1989
URL: http://archimer.ifremer.fr/doc/00120/23102/20951.pdf

δ15N of organic matter sources and benthic invertebrates along an estuarine gradient in Marennes-Oleron bay (France): implications for the study of trophic structure
Provedor de dados: 5
Autores: Riera, Pascal.
This study examined the delta(15)N of suspended and sedimented particulate organic matter, primary sources of organic matter and benthic invertebrates along an estuarine gradient in Marennes-Oleron Bay, France. Particular emphasis was given to the use of delta(15)N as a tracer of the origin of organic matter and as a means of determining the benthic food web structure in estuarine environments. delta(15)N values indicated that there was direct utilisation of benthic diatoms as a food source by oyster Crassostrea gigas near intertidal mudflats but suggested trophic mediation between terrestrial detritus and oysters in the upper estuarine reaches. delta(15)N data showed that the trophic position of oysters may vary in the estuarine bay. The delta(15)N values...
Tipo: Text
Palavras-chave: Nitrogen isotope ratio; Particulate organic matter; Crassostrea gigas; Benthic food web; Estuary; Marennes-Oleron Bay.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00448/55926/57786.pdf

Fortnightly tidal asymmetry inversions and perspectives on sediment dynamics in a macrotidal estuary (Charente, France)
Provedor de dados: 5
Autores: Toublanc, Florence; Brenon, Isabelle; Coulombier, T.; Le Moine, Olivier.
Tidal asymmetry is a phenomenon that characterises estuarine hydrodynamics and has a strong impact on sediment dynamics. Extensive research has been dedicated to studying tidal dynamics in semidiurnal macrotidal estuaries, highlighting several general principles. The ratio of flood to ebb peak velocities and differences in ebb and flood durations are often used to characterise the asymmetry encountered in estuaries. In the Charente estuary (French Atlantic coast), water surface elevation data obtained using an ADCP (Acoustic Doppler Current Profiler) and a tide gauge show that the duration asymmetry undergoes inversions during the spring-neap tidal cycle. A two-dimensional hydrodynamics model is used to investigate the connection between spring-neap...
Tipo: Text
Palavras-chave: Estuary; Tidal asymmetry; Duration asymmetry; Ebb/flood dominance; Morphology; External/internal overtides; Sediment transport.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00245/35650/40645.pdf

Mortalites de poissons en baie de Vilaine (Juillet 1982) Causes - Mécanismes - Propositions d'action
Provedor de dados: 5
Autores: Merceron, Michel.
The massive number of fish mortalities that occurred in July of 1982 in Vilaine Bay is due to a very pronounced oxygen depletion in the bay's bottom waters. This loss was caused by the chronic fragility of this area, associated with an abnormal weather pattern. The endemism of partial oxygen depletion has been brought to light. The latter could be economically more significant than the anoxia of 1982. Preventative and warning actions have been proposed.
Tipo: Text
Palavras-chave: Brittany; Dam; Estuary; Meteorological factors; Stratification; Phytoplankton; Oxygen depletion; Coastal waters; Fish kill; Estuaire; Facteurs météorologiques; Stratification; Prolifération planctonique; Déficit en oxygène; Eaux côtières; Mortalité de poisson.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/1987/rapport-2836.pdf

Dynamique sédimentaire et évolution holocène d'un système macrotidal semi-fermé : l'exemple de la rade de Brest
Provedor de dados: 5
Autores: Gregoire, Gwendoline.
The bay of Brest is a tide-dominated, semi-enclosed coastal basin, which is connected with two rivers (Aulne and Elorn). Its jagged shoreline and seabed morphology constitute an ideal setting to understand sedimentary transfer at the land-sea interface. In this aim, this study is divided in two different time scale. The first (a) focuses on the present-day sedimentary bedload dynamic and the second (b) on the reconstruction of the Holocene infilling, during the last marine transgression. (a) A analyse combining a sedimentology approach and numerical has highlighted the major control of the tidal currents. Swells and rivers have a minor impact, because the inherited morphology accentuates and promotes tidal currents. There are responsible of a shelly sandy...
Tipo: Text
Palavras-chave: Dynamique sédimentaire; Holocène; Paléo-vallée; Estuaire; Système côtier; Rade de Brest; Carottages; Sismique-réflexion; Imagerie; Bathymétrie; Seismic reflection; Coastal system; Bay of Brest; Coring; Paleo-valley; Estuary; Sedimentary dynamic; Backscatter imagery; Bathymetry.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00498/60920/64282.pdf

Spatio-seasonal patterns of demersal fish communities on the French Guiana Coast
Provedor de dados: 5
Autores: Le Joncour, Anna; Blanchard, Fabian; Tagliarolo, Morgana.
Estuarine and coastal areas are often considered as hotspots due to their high diversity and ecological importance. However, communities living on those areas are often submitted to fishery and climate change pressures causing modifications on fish assemblages. French Guiana’s coastal shelf is characterised by warm waters with high turbidity and low salinity caused by the large river discharges from the Amazon and nearby estuaries. The high productivity of these areas supports fisheries and aquaculture activities. However, the structure and dynamics of coastal fish populations in French Guiana have seldom been studied. The aim of this study was to understand the effect of environmental conditions, as well as the influence of the coast and nearby estuaries...
Tipo: Text
Palavras-chave: French Guiana; Coastal community; Estuary; Diversity; Tropical waters; Fisheries management.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00607/71929/73534.pdf

Nouveau modèle analytique pour une meilleure estimation des flux nets annuels en métaux dissous. Cas du cadmium dans l’estuaire de la Gironde
Provedor de dados: 5
Autores: Pougnet, F.; Blanc, G; Mulamba-guilhemat, E.; Coynel, A.; Gil-diaz, T.; Bossy, C.; Strady, E.; Schäfer, J.
Despite major management efforts initiated in 1987 and 2007 and decreasing emissions in the Gironde watershed, cadmium (Cd) levels in oysters from the downstream Gironde estuary are still higher to the consumption limit (5 mg/kg, dw, EC). Dissolved Cd concentrations were measured in surface water collected in the Gironde estuary during nine cruises (2014 – 2015). The obtained theoretical (Cdd0) concentrations and the daily net Cdd fluxes, using the Boyle’s method, confirm a decadal stepping decrease of the Cd pollution corresponding to that observed in the oysters from the long term national monitoring for priority contaminants at the estuary mouth. As this observation invalidates the previous estimating methods for estimating annual net Cdd fluxes, we...
Tipo: Text
Palavras-chave: Estuaire; Cadmium dissous; Modélisation; Flux nets; Estuary; Dissolved cadmium; Computation; Net fluxes.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00485/59713/62808.pdf

Température et salinité dans l'Aber Benoît et l'Aber Wrach été 1991, rapport de mesures
Provedor de dados: 5
Autores: Merceron, Michel; Gaffet, Jean-dominique.
This report displays the data of temperature and salinity from the records performed in the Aber Wrach and Aber Benoît estuaries during the summer 1991. This work was decided after a massive oyster kill in the Aber Benoît estuary.
Tipo: Text
Palavras-chave: Brittany; Estuary; Salinity; Temperature; Bretagne; Estuaire; Salinité; Température.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/1991/rapport-2659.pdf

Etude des nourriceries de la Baie de Seine orientale et de l'estuaire de la Seine
Provedor de dados: 5
Autores: Morin, Jocelyne; Riou, Philippe; Bessineton, Christophe; Vedieu, Christophe; Lemoine, Michel; Simon, Serge; Le Pape, Olivier.
This study, carried out from 1995 to 1997, within the framework of "Le Havre" harbour extension project, concerned halieutic populations and the characterization of a coastal nursery in the oriental part of the Seine bay and the Seine estuary . The main objective was to describe the specific and demographic composition of marine populations and their spatio-temporal distribution, and so assess the biological and halieutic role of this area. This study also included a research about the dietary needs of fish juveniles living in the estuary.  Autumn and winter surveys results show that the estuary and area under direct influence are the richest from a biological and halieutic point of view. The mouth estuary isthe richest area in terms of diversity of...
Tipo: Text
Palavras-chave: Bay of Seine; Estuary; Food; Trophic; Juvenile; Nursery; Baie de Seine; Estuaire; Alimentation; Trophique; Juvénile; Nourricerie.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/1999/rapport-1507.pdf

Spatial and temporal distribution of brachyuran crab larvae in Ibiraquera Lagoon, southern Brazil
Provedor de dados: 5
Autores: Brandão, Manoela; Stumpf, Liane; Macedo-soares, Luis; Freire, Andrea.
This study investigated the abundance and composition of brachyuran crab larvae in the four subsystems of Ibiraquera Lagoon throughout the year. A colder and drier period was detected, contrasting with warm months during which salinity varied depending on rainfall and whether the sand bar was open or closed. The mean density of brachyuran zoeae was 540 ± 96 (SE) larvae · 100 m-3. Mean density was significantly (p&lt;0.05) higher in three subsystems during April. Saco Lagoon (the outer subsystem) exhibited significantly higher (p&lt;0.05) mean density in July, August, October, November and December 2004. Larvae from the families Portunidae, Menippidae, Panopeidae, Ocypodidae and Varunidae were found in Ibiraquera Lagoon. Neohelice granulata Dana, 1851 was...
Tipo: Text
Palavras-chave: Decapoda larvae; Brachyura; Zoea; Estuary.
Ano: 2011
URL: https://archimer.ifremer.fr/doc/00597/70923/69163.pdf

Strong gradient of benthic biogeochemical processes along a macrotidal temperate estuary: focus on P and Si cycles
Provedor de dados: 5
Autores: Raimonet, Melanie; Andrieux, Francoise; Ragueneau, Olivier; Michaud, Emma; Kerouel, Roger; Philippon, Xavier; Nonent, Michel; Memery, Laurent.
Tipo: Text
Palavras-chave: Early diagenesis; Silicate; Phosphate; Authigenic phosphorus; Macrotidal; Estuary.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00130/24115/22493.pdf

Analysis and visualization of the glass eel behavior (Anguilla anguilla) in the Adour estuary and estimate of its upstream migration speed
Provedor de dados: 5
Autores: Prouzet, Patrick; Odunlami, Marc; Duquesne, Elise; Boussouar, Ahmed.
The studies carried out on the Adour estuary on the migration of glass eels lead to the characterisation of their swimming behavior. Individuals migrate passively with the flood tide current behind the dynamic tide front, and their movements into the water column are linked to the surrounding luminosity and water turbidity. A numerical model was built from observations gathered on glass eel densities during scientific surveys. It uses the outputs of a hydrodynamic model accounting for the variations in the river flow and tide coefficient. It allows the simulation of the displacement of a particle in the longitudinal axis of the estuary. The variation of the vertical movements through the water column takes into account the cloud cover, the moon phases, the...
Tipo: Text
Palavras-chave: Numerical modeling; Fish behavior; Migration; Estuary; Hydrodynamics; Exploitation rate; Glass eel; Anguilla anguilla; Atlantic Ocean.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00000/11171/7531.pdf

Abrupt shifts in the Gironde fish community: an indicator of ecological changes in an estuarine ecosystem
Provedor de dados: 5
Autores: Chevillot, Xavier; Pierre, Maud; Rigaud, Arthur; Drouineau, Hilaire; Chaalali, Aurelie; Sautour, Benoit; Lobry, Jeremy.
For decades, global climate change has directly and indirectly affected the structure and function of ecosystems. Abrupt changes in biodiversity have been observed in response to linear or sudden modifications to the environment. These abrupt shifts can cause long-term reorganizations within ecosystems, with communities exhibiting new functional responses to environmental factors. Over the last 3 decades, the Gironde estuary in southwest France has experienced 2 abrupt shifts in both the physical and chemical environments and the pelagic community. Rather than describing these shifts and their origins, we focused on the 3 inter-shift periods, describing the structure of the fish community and its relationship with the environment during these periods. We...
Tipo: Text
Palavras-chave: Ecosystem state; Fish diversity; Estuary; Generalised linear mixed models; GLMM; Time series; Shift; Inter-shift periods.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00334/44567/44282.pdf

Seaward pinching out and internal stratigraphy of the Gironde incised valley on the shelf (Bay of Biscay)
Provedor de dados: 5
Autores: Lericolais, Gilles; Berne, Serge; Fenies, Hugues.
An incised paleovalley offshore the estuary mouth of the Gironde River (Southwest France) was evidenced recently (Comptes Rendus de 1'Academie des Sciences de Paris 326 (1998) 701). Nevertheless its seaward extension to the shelf break was still unknown. New high-resolution geophysical data were acquired on the continental shelf in order to follow the incision until the shelf break. After processing the seismic lines, the shape of the valley was identified and the valley-fill in terms of sequence stratigraphy was interpreted.The valley-fill contains a single sequence corresponding to a fifth-order cycle (20 kyr). The three Systems Tracks described onshore by Alien and Posamentier (Journal of Sedimentary Petrology 63 (1993) 378; SEPM (Society for...
Tipo: Text
Palavras-chave: High resolution seismic data; Estuary; Sequence stratigraphy; Incised valley fill.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/publication-477.pdf

Phosphorus dynamics and bioavailability in sediments of the Penze Estuary (NW France): in relation to annual P-fluxes and occurrences of Alexandrium Minutum
Provedor de dados: 5
Autores: Andrieux-loyer, Francoise; Philippon, Xavier; Bally, Gabriel; Kerouel, Roger; Youenou, Agnes; Le Grand, Jacqueline.
The macrotidal estuary of Penze (Brittany, Western part of the Channel, France) has been subjected to recurrent annual toxic blooms of Alexandrium minutum since 1988. This study aims to specify the phosphorus dynamics and bioavailability in sediments in order to improve our understanding of Alexandrium occurrences. Sediment-P pools and diffusive phosphate fluxes were studied under similar hydrodynamic conditions, in the intermediate estuary in May, June and July 2003 and along the salinity gradient from August 2004 to June 2005. The results highlight a decrease in bioavailable phosphorus (iron and organic bound) from the inner part of the estuary seaward. The ratio of iron-bound phosphorus to iron-oxyhydroxides is lower in the inner and intermediate...
Tipo: Text
Palavras-chave: Sequential extraction; Sediment phosphorus; Pore water; Phosphate fluxes; Estuary; Alexandrium minutum.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4306.pdf

Suspended Sediment Dynamics in the Macrotidal Seine Estuary (France) - Part 1: Numerical Modeling of Turbidity Maximum Dynamics
Provedor de dados: 5
Autores: Grasso, Florent; Verney, Romaric; Le Hir, Pierre; Thouvenin, Benedicte; Schulz, Elisabeth; Kervella, Youenn; Fard, I. Khojasteh Pour; Lemoine, J. -p.; Dumas, Franck; Garnier, Valerie.
Tidal pumping, baroclinic circulation and vertical mixing are known to be the main mechanisms responsible for the estuarine turbidity maximum (ETM) formation. However, the influence of hydro-meteorological conditions on ETM dynamics is still not properly grasped and requires further investigation to be quantified. Based on a realistic 3-dimensional numerical model of the macrotidal Seine Estuary (France) that accounts for mud and sand transport processes, the objective of this study is to quantify the influence of the main forcing (river flow, tides, waves) on the ETM location and mass changes. As expected, the ETM location is strongly modulated by semidiurnal tidal cycles and fortnightly timescales with a high sensitivity to river flow variations. The ETM...
Tipo: Text
Palavras-chave: Estuary; Mud; Sand; Hydrodynamics; Turbidity maximum; Waves; Measurement; Modeling.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00416/52770/53638.pdf

Analyse des tendances des séries temporelles de la concentration en azote minéral dissous dans les trois principaux estuaires de la façade Manche-Atlantique
Provedor de dados: 5
Autores: Gailhard, Isabelle.
Estuaries are areas which, from their structure, their fonctioning, and their localisation, are subject to significant contribution of nutrients. One of the objectif of the RNO, the French network for coastal water quality monitoring, is to assess the levels and trends of nutrient concentrations in estuaries. A linear model was used in order to describe and to explain the total dissolved nitrogen concentration evolution in the three most important estuaries on the Chanel-Atlantic front (Seine, Loire and Gironde). As a first step, the selection of a reliable data set was performed. Then total dissolved nitrogen evolution schemes in estuary environment were graphically studied, and allowed a resonable choice of covariables. The salinity played a major role...
Tipo: Text
Palavras-chave: Nutriments; Estuaire; Loire; Seine; Gironde; Schéma de dilution; Modèle linéaire; Tendance; Nutrients; Estuary; Seine; Loire; Gironde; Dilution schema; Linear mode1; Trend.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00079/19070/16665.pdf

Influence of hydro-sedimentary factors on mollusc death assemblages in a temperate mixed tide-and-wave dominated coastal environment: Implications for the fossil record
Provedor de dados: 5
Autores: Poirier, Clement; Sauriau, Pierre-guy; Chaumillon, Eric; Bertin, Xavier.
Mollusc death assemblages were recovered in 98 subtidal sampling stations on the seafloor of the shallow Pertuis Charentais Sea (Atlantic coast of France). Taxonomic composition and spatial distribution of death assemblages were investigated, as well as their response to sediment grain size (field data), bottom shear stress (coupled tide and wave hydrodynamic modelling), and sediment budget (bathymetric difference map) Results showed that molluscs are likely to be reliable paleoenvironmental indicators since death assemblages were able to acquire ecological changes within years (decadal-scale taphonomic inertia), and live-dead agreement inferred from existing data on living benthic communities was high, except close to river mouths and intertidal mudflats...
Tipo: Text
Palavras-chave: Benthos; Estuary; Holocene; Paleoecology; Sediment budget; Taphonomy.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00017/12814/10260.pdf

Les polychlorobiphenyles ( PCB ) en Baie de Seine
Provedor de dados: 5
Autores: Abarnou, Alain.
PCB contamination and i ts relationship wi th suspended particulate matter (SPM) have been studied in water from the Seine estuary and the baie de Seine, in July 1985 and February 1986. PCB chromatograms are very similar and characterize a chronic contamination. PCB concentrations vary from 2 ng/l in the marine zone up to 210 ng/l in the estuary. SPM and PCB concentrations are weIl correlated. Highest PCB concentrations are measured in February due to higher SPM inputs mainly made of finer particles.
Tipo: Text
Palavras-chave: PCB; Seine; Fleuve; Estuaire; Baie; Matières en suspension; PCB; Seine; River; Estuary; Bay; Suspended particulate matter.
Ano: 1988
URL: http://archimer.ifremer.fr/doc/00138/24924/23020.pdf

The mosaic of habitats of the Seine estuary: Insights from food-web modelling and network analysis
Provedor de dados: 5
Autores: Tecchio, Samuele; Rius, Antonio; Dauvin, Jean-claude; Lobry, Jeremy; Lassalle, Geraldine; Morin, Jocelyne; Bacq, Nicolas; Cachera, Marie; Chaalali, Aurelie; Villanueva, Ching-maria; Niquil, Nathalie.
Ecological network analysis was applied in the Seine estuary ecosystem, northern France, integrating ecological data from the years 1996 to 2002. The Ecopath with Ecosim (EwE) approach was used to model the trophic flows in 6 spatial compartments leading to 6 distinct EwE models: the navigation channel and the two channel flanks in the estuary proper, and 3 marine habitats in the eastern Seine Bay. Each model included 12 consumer groups, 2 primary producers, and one detritus group. Ecological network analysis was performed, including a set of indices, keystoneness, and trophic spectrum analysis to describe the contribution of the 6 habitats to the Seine estuary ecosystem functioning. Results showed that the two habitats with a functioning most related to a...
Tipo: Text
Palavras-chave: Trophic network; Estuary; Ecological network analysis; Ecopath with Ecosim; Food web; Ecosystem health indicators.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00270/38154/42026.pdf

Cadmium and mercury in Seine Estuary flounders and mussels: the results of two decades of monitoring
Provedor de dados: 5
Autores: Nakhle, K; Cossa, Daniel; Claisse, Didier; Beliaeff, Benoit; Simon, S.
The flounder (Platichthys flesus) is a flatfish that inhabits marine coastal environments, especially estuaries. It is an alternative quantitative biological indicator to the common marine mussel (Mytilus spp.), which is currently used as a sentinel species to monitor chemical contamination in numerous monitoring programmes. Findings from two decades of monitoring cadmium (Cd) and mercury (Hg) using both sentinel species in the Seine Estuary (France) are reported. For comparison, time-series of water concentrations for the same two metals at the mouth of the River Seine are given. Cd concentrations in the liver of the fish and in the soft tissue of mussels show similar temporal trends, consistent with the major temporal variations of Cd concentrations...
Tipo: Text
Palavras-chave: Platichthys flesus; Mussel watch; Monitoring; Mercury; Flounder; Estuary; Cadmium.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-3028.pdf

Contamination du milieu marin par les micropolluants (résultats du RNO de 1979 à 1994). 3 : L'estuaire de la Gironde
Provedor de dados: 5
Autores: Cantin, Christian.
After a quick presentation of the observation national network of the marine environment quality (RNO), the different metallic and organic Micropollutants measured in the gironde estuary are described (origin, eventual toxicity). The results of the contamination measurements in the living tissue (oysters) are presented on graphics, based on a sample every three months from 1979 to 1994, and means are compared to those obtained during the same period on the others points of the Manche-Atlantique coast.  
Tipo: Text
Palavras-chave: Micropolluants; Estuaire; Gironde; Huîtres; Micropollutants; Estuary; Gironde; Oyters.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00422/53310/54148.pdf

Acetylcholinesterase activity in copepods (Tigriopus brevicornis) from the Vilaine River estuary, France, as a biomarker of neurotoxic contaminants
Provedor de dados: 5
Autores: Forget, Joelle; Beliaeff, Benoit; Bocquene, Gilles.
From April 1997 to June 1998, 14 measurements of acetylcholinesterase (AChE) enzymatic activity were performed with the copepod, Tigriopus brevicornis, collected at five stations in the Vilaine River estuary (South Brittany, France). Simultaneously, four chemical analyses of triazines and one analysis of total pesticides in water were undertaken. AChE activity levels in T brevicornis were compared to the levels measured at a reference site not exposed to effluents from Vilaine River. Results reveal significant differences between AChE activity levels depending on location of stations in the plume of the river with an increasing gradient of activity from the upstream to the downstream stations, thus indicating that neurotoxic contaminants are mainly brought...
Tipo: Text
Palavras-chave: Monitoring; Estuary; Pollution; Pesticides; Tigriopus brevicornis; Acetylcholinesterase activity.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/publication-737.pdf

The PPEAO experimental fishing dataset: Fish from West African estuaries, lagoons and reservoirs
Provedor de dados: 5
Autores: Simier, Monique; Ecoutin, Jean-marc; Tito De Morais, Luis.
Background This paper describes a dataset of fish, crustacean and mollusc occurrences extracted from the “Experimental Fishing” section of the IRD's PPEAO information system. PPEAO stands for “Fish communities and artisanal fisheries of West African estuarine, lagoon and freshwater ecosystems”. This database contains information collected using two different methods: experimental fishing and surveys of the artisanal fisheries that exploit these ecosystems. The database is accessible at http://ppeao.ird.fr. New information The current dataset is available on GBIF.org at 10.15468/ra4voa. It comprises the occurrences of 314 fish, crustacean and mollusc taxa collected in experimental sampling surveys of different aquatic ecosystems in West Africa between 1979...
Tipo: Text
Palavras-chave: Coastal area; Crustacean; Estuary; Experimental fishing; Fish; Lagoon; Mollusc; Reservoir lake; Tropical area; West Africa.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00482/59324/62086.pdf

Biodegradation of [D-Leu1] microcystin-LR by a bacterium isolated from sediment of Patos Lagoon estuary, Brazil
Provedor de dados: 80
Autores: Lemes,Gilmar AF; Kist,Luiza W; Bogo,Mauricio R; Yunes,João S.
Background Toxic cyanobacterial blooms are recurrent in Patos Lagoon, in southern Brazil. Among cyanotoxins, [D-Leu1] microcystin-LR is the predominant variant whose natural cycle involves water and sediment compartments. This study aimed to identify and isolate from sediment a bacterial strain capable of growing on [D-Leu1] microcystin-LR. Sediment and water samples were collected at two distinct aquatic spots: close to the Oceanographic Museum (P1), in Rio Grande City, and on São Lourenço Beach (P2), in São Lourenço do Sul City, southern Brazil. Methods [D-Leu1] microcystin-LR was isolated and purified from batch cultures of Microcystis aeruginosastrain RST9501. Samples of water and sediment from Rio Grande and São Lourenço do Sul were collected....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodegradation; Microcystin; Sediment; Patos Lagoon; Estuary; Brazil.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992015000100313

Dry season distribution of hydroids in a small tropical estuary, Pernambuco, Brazil
Provedor de dados: 16
Autores: Calder, D.R.; Maÿal, E.M.
Hydroid distribution patterns along a horizontal ecocline in the Rio Formoso/Rio Ariquindá/Rio Porto Alegre system, a small and seasonally poikilohaline estuary on the tropical northeast coast of Brazil, were investigated. Collecting was undertaken during the dry season, in November 1993, by diving (with and without SCUBA). Nine stations were sampled on a transect extending from a reef outside the river mouth to a mangrove system at the upper end of the estuary. Four major regions were distinguished along the ecocline based on numerical analyses of hydroid species/station location data: (1) nearshore reef — a sandstone ledge outside the entrance of the estuary; (2) river mouth — a sandy and shelly flood-tidal delta area inside the entrance of the Rio...
Tipo: Article / Letter to the editor
Palavras-chave: Cnidaria; Hydrozoa; Hydroids; Estuary; Zonation; Distribution; Ecology; Brazil.; 42.72.
Ano: 1998
URL: http://www.repository.naturalis.nl/record/317616

Ecomorphology and resource use by dominant species of tropical estuarine juvenile fishes
Provedor de dados: 83
Autores: Pessanha,André Luiz Machado; Araújo,Francisco Gerson; Oliveira,Ronnie Enderson M. C. C.; Silva,Adna Ferreira da; Sales,Natalice Santos.
Eleven ecomorphological attributes and diet of seventeen juvenile fish species were examined to test the hypothesis that morphological patterns determine resource uses in estuarine habitats. Species were separated according to the apparatus to food capture and habitat use (benthic or pelagic) in three different groups: (1) a group with depressed fish body, strong caudal peduncle and enlarged pectoral fins; (2) a second group laterally flattened with a wide protruding mouth, and (3) a third group strongly flattened with small pectorals fins. The following six trophic groups were organized based on prey categories: Zooplanktivores, Benthivores, Omnivores, Detritivores, Macrocarnivores and Insectivores. Significant results (PERMANOVA) between ecomorphological...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diets; Estuary; Habitats; Morphology; Resource partitioning.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000200401

Evidence of habitat fragmentation affecting fish movement between the Patos and Mirim coastal lagoons in southern Brazil
Provedor de dados: 83
Autores: Burns,Marcelo D. M.; Garcia,Alexandre M.; Vieira,João P.; Bemvenuti,Marlise A.; Marques,David M. L. Motta; Condini,Vinicius.
The communication between the Patos and Mirim lagoon systems occurs via a natural channel called São Gonçalo. In 1977, a dam was built in this channel to prevent entrance of saline waters from Patos Lagoon estuary into the Mirim Lagoon. Our results showed an abrupt discontinuity in salinity and fish species distribution along the study sites. Sites below the dam showed salinity values higher than zero, whereas sites above had zero salinity values across all sampling periods. Marine and estuarine fishes (e.g., mullets Mugil platanus, M. curema, silversides Odontesthes argentinensis, Atherinella brasiliensis, sardine Brevoortia pectinata, and white croaker Micropogonias furnieri) were not captured above the dam. If these juvenile fishes could enter the Mirim...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dam; Fish migration; Artisanal fishery; Estuary.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000100006

Abundance and diversity patterns of the sessile macrobenthic community associated with environmental gradients in Vitória Harbor, southeastern Brazil
Provedor de dados: 103
Autores: Zalmon,Ilana Rosental; Krohling,Werther; Ferreira,Carlos Eduardo Leite.
Harbor terminals and urban sewage effluents affect the composition and distribution of epibenthic organisms. In this study, we hypothesized that the benthic community structure at the Vitoria Harbor changes spatially in a ~3 km scale, and that these changes are associated with environmental gradients resulting from point-source sewage and differences in the physical and chemical parameters of the water along the harbor access channel. Four sites, internal (PI), intermediate-internal (PMI), intermediate-external (PME) and external (PE), varying from 0.5 to 4.0 km off the harbor, were sampled on five quadrats at six sampling dates (N = 30 per site). The epibenthic community on the shallow sublitoral rocky shore was sampled fortnightly from December 2005 to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Epibenthic community; Environmental gradient; Estuary; Sedimentation.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000500012

Gonadal development and sexuality of Larkinia grandis (Arcida: Arcidae) inhabiting southeastern Gulf of California
Provedor de dados: 103
Autores: Sotelo-Gonzalez,Maria I.; García-Ulloa,Manuel; Góngora-Gómez,Andrés M.; Salcido-Guevara,Luis A.; Arzola-González,Juan F.; Sepúlveda,Carlos H.; Sánchez-Cárdenas,Rebeca.
ABSTRACT Larkinia grandis (Broderip &amp; G.B. Sowerby I, 1829), an important fishing resource for Mexican communities, is an Arcidae clam. It is also considered a species with aquaculture potential. In this work we investigated the gonadal phases and sexuality in a population of L. grandis in the Gulf of California. Our findings support the hypothesis that there is one male per female in the population studied. It also documents that the shape, position and color of the gonads of L. grandis are consistent with observations in other Arcidae species. Additionally, five gonadal phases are differentiated and described in males and females (development, mature, spawning, post-spawning and resting), with a noticeable presence of brown cells during post-spawning...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bivalve; Estuary; Gametogenesis; Gonad; Mangrove cockle; Sex cells.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702021000100306

Spatial distribution of the estuarine ichthyofauna of the Rio Formoso (Pernambuco, Brazil), with emphasis on reef fish
Provedor de dados: 103
Autores: Paiva,Andréa C. G. de; Lima,Marina F. V.; Souza,José R. B. de; Araújo,Maria E. de.
The objectives of the present study were to identify species of reef fish that use the Rio Formoso estuary (northeastern Brazil) as a refuge and natural nursery and to describe the spatial distribution of the estuary fish fauna in rainy and dry seasons. A total of 5475 specimens, across 78 species and 39 families, were analyzed; 51.3% of the species were of reef origin. Among these, Eucinostomus melanopterus (Bleeker, 1863), E. gula (Cuvier, 1830), and Sphoeroides testudineus (Linnaeus, 1758), in this order, were the most abundant in the upper estuary; S. greeleyi Gilbert, 1900, E. melanopterus, and Lutjanus synagris (Linnaeus, 1758) were the most abundant in the mid estuary; and E. gula and Albula vulpes (Linnaeus, 1758) in the lower estuary. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Connectivity; Estuary; Fish community; Reef fishes; Spatial variation.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000200009

Biodiversity of decapod crustaceans in the estuarine floodplain around the city of Belém (Pará) in Brazilian Amazonia
Provedor de dados: 103
Autores: Cavalcante,Danielle Viveiros; Silva,Bianca Bentes da; Martinelli-Lemos,Jussara Moretto.
The present study focused on the decapod fauna of the fluvial-estuarine environment of the Guajará Bay, in the Brazilian state of Pará, where specimens were collected monthly from six sites, from May 2006 to April 2007. A total of 6,793 specimens were captured, belonging to 11 species of crab and shrimp: eight palaemonids - Macrobrachium amazonicum (Heller, 1862), Macrobrachium surinamicum Holthuis, 1948, Macrobrachium carcinus (Linnaeus, 1758), Macrobrachium rosenbergii (De Man, 1879), Macrobrachium spp. 1-4 -, one portunid - Callinectes bocourti A. Milne-Edwards, 1879 -, and two trichodactylids - Sylviocarcinus devileii H. Milne-Edwards, 1853 and Sylviocarcinus pictus (Milne-Edwards, 1853). While no significant differences were found in the ecological...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Decapoda; Diversity; Estuary.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702012000300003

Spatio-temporal distribution of spionids (Polychaeta-Spionidae) in an estuarine system in south-central Chile
Provedor de dados: 97
Autores: DÍAZ-JARAMILLO,MAURICIO; MUÑOZ,PAMELA; DELGADO-BLAS,VÍCTOR; BERTRÁN,CARLOS.
This study is based on the identification and distribution of spionid polychaetes in relation to abiotic characteristics of the environment at the mouth of the Valdivia-Tornagaleones estuary in south-central Chile. Four samplings were carried out in 2005, in which eight species were identified including Aquilaspio peruana, Boccardia polybranchia, Carazziella carrascoi, Dipolydora socialis, Minuspio patagónica, Rhynchospio glutaea, Scolelepis quinquedentata and Spiophanes sp. As it is typical of other estuaries in south central Chile, spionids were an important component of the macroinfauna of the Valdivia estuary. The distribution of the Spionidae family in the system showed higher species richness in the outer reach of the estuary but higher abundance...
Tipo: Journal article
Palavras-chave: Polychaeta; Spionidae; Distribution; Estuary; Salinity; Sediments; Chile.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000400005

First record of the invasive medusa Blackfordia virginica (Hydrozoa: Leptomedusae) in the Río de la Plata estuary, Argentina-Uruguay
Provedor de dados: 97
Autores: GENZANO,GABRIEL; MIANZAN,HERMES; ACHA,EDUARDO M; GAITÁN,ESTEBAN.
Blackfordia virginica is a well-known invasive medusa inhabiting estuarine areas. It was recently detected in northern Argentina, constituting the first record of invasive hydromedusa for the Argentine Sea. In this work more than 1,500 plankton samples in the southwestern Atlantic Ocean (34-55º S) from 1983 to 2000 were analyzed. More than 5,000 specimens per sample of B. virginica were found in Río de la Plata estuary for the first time in February 2000. This river is one of the large waterways of South America with an intense nautical traffic and several exotic species has been recorded here, mainly due to trans-oceanic shipping traffic. It is important to point out that we found medusae of both sexes (therefore this species could be introduced in either...
Tipo: Journal article
Palavras-chave: Hydromedusae; Invasive species; Estuary; South western Atlantic Ocean.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000200011

Further observations on zooplankton of the Potengi Estuary (Natal, Rio Grande do Norte, Brazil) with special reference to the larvae of Brachyura (Crustacea, Decapoda)
Provedor de dados: 104
Autores: Sankarankutty,C; Oliveira,J.E. Lins; Cunha,K.M.F; Silva,A.C.C; Barroca,E.V.G.
The present paper deals with data on zooplankton collected from the estuary of Potengi, Natal, Rio Grande do Norte, Brazil covering a period of one year from October 1992 to October 1993. Three fixed stations within the estuary located at varying distances from the mouth of the river were sampled. Sampling was done monthly when the tide was lowest. Analysis of the samples has shown clear pattern of seasonal variations in abundance of the dominant zooplankton components which are composed of Copepoda, Appendicularia, larvae of Brachyura, larvae of Cirripedia and Chaetognalha. A detailed study of the larvae of Brachyura was also attempted which showed that seven species can be identified in the samples, of which those of Aratus pisonii (H. Milne Edwards) and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachyura; Seasonal; Abundance; Taxonomy; Larvae; Estuary; Brazil.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751995000200007

Aspectos da alimentação de Genidens genidens (Valenciennes) (Siluriformes, Ariidae) na Baía de Guaratuba, Paraná
Provedor de dados: 104
Autores: Chaves,Paulo de Tarso da Cunha; Vendei,Ana Lúcia.
Seasonal variation of the food items of the "bagre-urutu", Genidens genidens is analysed based on monthly samples between September, 1993 and April, 1995 at the Guaratuba Bay, coast of Paraná. The stomach contents of 105 fish is analysed by the Occurrence Frequency Method and 41 of these have also been analysed by the Volumetric Method. Matching both methods using the Preponderance índices, a larger incidence of decapods is determined, followed by other crustaceans, molluscs, polychaets, fish, and plant material. The data show the existence of a strong seasonal variation in the diet.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Guaratuba Bay; Estuary; Ariidae; Seasonal Variation; Diet.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751996000300016

Diel and seasonal changes in the macrozooplankton community of a tropical estuary in Northeastern Brazil
Provedor de dados: 104
Autores: Silva,Tâmara de Almeida e; Neumann-Leitão,Sigrid; Schwamborn,Ralf; Gusmão,Lúcia Maria de Oliveira; Nascimento-Vieira,Dilma Aguiar do.
Studies were carried out to assess the macrozooplankton small-scale temporal and spatial variability at three stations in three hours intervals, during 24 hours in July 1996 (rainy season) and December 1996 (dry season). A plankton net 300µm mesh size was hauled at surface during three minutes. Water samples for salinity, temperature, dissolved oxygen and pH were taken simultaneously with the zooplankton samples. Sixty-five macrozooplankton taxa were registered. Copepoda constituted the most common taxon and comprised 58% of the total zooplankton counts. Brachyuran zoeae, cirripedian larvae, Larvacea (Oikopleura dioica Fol, 1872), and Gastropoda veligers were abundant at some tidal cycles, mainly during the night. Species diversity average was 2.0...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diurnal variation; Estuary; Planktonic fauna; Tidal variation.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752003000300012

Diet of the chola guitarfish, Rhinobatos percellens (Rhinobatidae), in the Paranaguá Estuarine complex
Provedor de dados: 42
Autores: Carmo,Wanessa P.D. do; Bornatowski,Hugo; Oliveira,Elton C.; Fávaro,Luís L.
The chola guitarfish, Rhinobatos percellens, is one of the most-captured batoids on the Brazilian coast, and an important predator of benthic community. Stomachs from R. percellens were sampled in the Paranaguá estuarine complex (March/2006 to March/2007 and October/2008 to September/2009). The stomachs obtained were used for describing the diet of R. percellens, and verifying if there are seasonal and ontogenetic differences in their feeding into the estuarine area. The general analysis showed a specialized diet with a predominance of three species in food contents: Leptochela serratorbita, Caridea remains and Ogyrides alphaerostris. Ontogenetic and seasonal analysis did not reveal significant differences in the food consumption. These data reveal that R....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Elasmobranchii; Rhinobatidae; Diet; Especialist; Caridea; Estuary.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200721

Hydrodynamic Aspects at Vitória Bay Mouth, ES
Provedor de dados: 42
Autores: GARONCE,FLÁVIA A.A.; QUARESMA,VALÉRIA S.
Understading the hydrodynamic behavior and suspended particulated matter (SPM) transport are of great importance in port regions such as Vitória Harbor, which is located at Vitória Bay, Vitória – ES, Brazil. Vitória Bay is an estuary that has not been systematically assessed through a temporal analysis in order to identify its hydrodynamics characteristics and SPM exchange. This study aims to investigate salt and suspended particulate matter flux at the estuarine mouth of Vitória Bay by understanding the temporal variation of salinity, temperature and tidal currents within the water column and at the channel crosssection. Results showed that the estuarine mouth tended to present partial stratification periods during neap tides and little stratification in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estuary; Hydrodynamics; Suspended particulate matter; Vitória Bay.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200555

Annual, seasonal and spatial abundance of the seabob shrimp Xiphopenaeus kroyeri (Decapoda, Penaeidae) off the Southeastern coast of Brazil
Provedor de dados: 42
Autores: HECKLER,GISELE S.; LOPES,MATEUS; SIMÕES,SABRINA M.; SHIMIZU,ROBERTO M.; COSTA,ROGERIO C. DA.
We investigated the influence of environmental factors in spatial and temporal distribution of the seabob shrimp Xiphopenaeus kroyeri in Santos Bay and São Vicente Estuary, state of São Paulo, Brazil. Monthly samples were obtained, from May 2008 through April 2010, from four locations in the estuary and four in the bay. No individual was collected in the estuary and this was attributed to the low salinity means recorded in this environment. We collected 109,153 individuals in the bay and there was no difference in abundance between the two years comprised by the study period. The similarity in spatial distribution can be related to sediment grain size that in all sampling locations showed great amount of very fine sand. The largest amount of reproductive...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Distribution; Environmental factors; Estuary; Santos Bay.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301337

A reevaluation of the late quaternary sedimentation in todos os Santos Bay (BA), Brazil
Provedor de dados: 42
Autores: LESSA,GUILHERME C.; BITTENCOURT,ABÍLIO C.S.P.; BRICHTA,ARNO; DOMINGUEZ,JOSÉ M. L.
Todos os Santos Bay is a large (&lt;img ALIGN="BOTTOM" BORDER="0" SRC="http:/img/fbpe/aabc/v72n4/0052img1.gif" ALT="$ \approx$"&gt; 1000 km²), structurally controlled tidal bay in northeast Brazil. Three main drainage basins debouch into the bay, providing a mean freshwater discharge of 200 m³/s (prior to 1985), or less than 1% of the spring tidal discharge through the bay mouth. Based on the result of several sedimentological studies performed in the 1970's, five surface sedimentary facies were identified inside the bay, namely i) transgressive siliciclastic marine sand facies; ii) transgressive bay sand-mud facies; iii) a transgressive carbonate marine sand facies; iv) regressive bay-mud facies, and v) regressive fluvial sand facies. The spatial...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estuary; Sediment; Stratigraphy; Holocene.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400008

Changes in mangrove extension at the Pacoti River estuary, CE, NE Brazil due to regional environmental changes between 1958 and 2004
Provedor de dados: 49
Autores: Lacerda,Luiz Drude de; Menezes,Marcelo Oliveira Teles de; Molisani,Maurício Mussi.
Regional land use changes at the Pacoti River basin, Ceará State, NE Brazil resulted in doubling the mangrove area from 1958 (0.71 km²) to 2004 (1.44 km²). Most of the increase was due to the replacing of salt marsh vegetation inland, but also along newly formed islands and enlarged river banks. Drastic reduction in freshwater supply and sediment accumulation due to river damming were probably the major drivers of the increased mangrove cover. However, changes due to global climate changes can not be ruled out.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mangroves growth; Regional changes; Estuary.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032007000300007

COMPARATIVE ANALYSIS OF TRADITIONAL SOLAR SALTWORKS AND OTHER ECONOMIC ACTIVITIES IN A PORTUGUESE PROTECTED ESTUARY
Provedor de dados: 50
Autores: Sainz-López,Noa.
ABSTRACT This study shows that Traditional Solar Saltworks can be competitive with other land uses in the Nature Reserve of Castro Marim and Vila Real de Santo Antonio Saltmarshes ("Reserva Natural do Sapal de Castro Marim e Vila Real de Santo Antonio", in Portuguese), sited in the estuary of the Guadiana River (SW Iberian Peninsula, Europe); particularly, if they are specialized in extraction of Fleur de Sel (or Flower of Salt), a gourmet variety of sea salt. Artisanal sea salt production based on solar evaporation methods of millennial history in the area is an environmentally sustainable activity in harmony with saltmarsh landscape. Two crystallizers of a 1 ha Traditional Solar Saltworks were monitored during 70 days from June to August 2015 with the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Protected natural area; Artisanal saltworks; Coastal wetland; Integrated management; Estuary.
Ano: 2017
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612017000100171

Seasonal dynamics in the inner Guayas Estuary, Ecuador
Provedor de dados: 50
Autores: Marín Jarrín,María José; Marín Jarrín,José R.; Borbor-Córdova,Mercy J.; Espinoza Celi,Maria Esther; Domínguez-Granda,Luis.
ABSTRACT The Guayas estuary in Ecuador is the largest estuarine ecosystem on the Pacific coast of South America. This estuary provides nursery and fisheries habitats, as well as filtering and detoxification services provided by suspension feeders, vegetation, and wetlands. We used oceanographic and meteorological observations to understand the hydrodynamic variability of two areas in the inner part of the estuary, Manglares de Churute and Estero Salado, from February 2016 to February 2017. Churute has less anthropogenic impacts than Estero Salado, which is currently uncoupled from river flow and highly influenced by Guayaquil, the second largest city in Ecuador, and adjacent shrimp pond effluents. The influences from the ocean and river on Churute include...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydrodynamics; Mangroves; Estuary; Guayas; Seasonality.
Ano: 2022
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612022000200129

RELACIONES TRÓFICAS DE CINCO ESPECIES DE PECES DE INTERÉS COMERCIAL EN LA BAHÍA DE CARTAGENA, CARIBE COLOMBIANO
Provedor de dados: 50
Autores: Cogua,Pilar; Jiménez-Reyes,María F.; Duque,Guillermo.
Cartagena Bay is a highly productive habitat which supports important aquatic communities and is considered an estuarine environment. During the sampling season, five commercial fish were captured: ladyfish (Elops smithi), machuelo (Opisthonema oglinum), mullet (Mugil incilis), sea bass (Centropomus ensiferus), and corvina (Cynoscion jamaicensis), all which stomach contents were analyzed. From all the fish captured, 82.6% presented contents in their stomachs, which were separated into 57 items, such as benthic microalgae, dinoflagellates, cyanophytes, sponges, mollusks, annelids, crustaceans, and fish. According to the Importance Relative Index (IRI), E. smithi, C. ensiferus, and C. jamaicensis were classified as third order consumers, O. oglinum as a...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Trophic characterization; Cartagena Bay; Estuary; Lepidophagy.
Ano: 2013
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612013000100012

Temporal space-variation of fish larvae in the Gulf of Guayaquil, Ecuador
Provedor de dados: 50
Autores: Calderón-Peralta,Gregoria; Ayora-Macías,Gabriela; Solís-Coello,Pilar.
ABSTRACT This study presents the density, taxonomic composition, spatial and temporal distribution of fish larvae in the Gulf of Guayaquil, as well as the relationship with some physical-chemical variables. Samples were collected at 16 stations, taken in the first nautical mile of the external and internal estuary of the gulf, located in front of the province of Guayas and northwest of the island of Puná, during June to December 2012. Surface trawls were carried out with a simple conical network (mesh eye: 300 μm; mouth diameter: 0.3 m; length: 1.2 m). Temperature, salinity, and transparency were measured before each drag. Significant differences were detected between zones, registering higher temperatures, lower salinity, and transparency in the interior...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ichthyoplankton; Gulf of Guayaquil; Hydrographic variables; Estuary; Ecuador.
Ano: 2020
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612020000100135

Reproductive behavior of the mangrove crab Ucides cordatus (Crustacea; Brachyura; Ucididae)
Provedor de dados: 52
Autores: Linhares,Jussiara Candeira Spíndola; Silva,José Roberto Feitosa.
The aim of the present work was to study the reproductive behavior of the mangrove crab (Ucides cordatus) in the estuary of the Igaraçú River (Piauí, Brazil). Courtship and mating were observed in December 2007 and in January-March 2009. The most frequently observed reproductive behavior was the transference of eggs onto the abdomen of the female. Some disputes between males and some copulations were observed. The males mated with more than one female each night and all mating activity occurred at night. The establishment of a closed season coinciding with the mating season represented an effective strategy for the preservation of the species when the socioeconomic situation of the community of gatherers was taken into account.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Courtship; Mating; Maturation; Estuary; "Andada"; Seasonality.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000600014

Changes in nutrient loads (N, P and Si) in the São Francisco estuary after the construction of dams
Provedor de dados: 52
Autores: Medeiros,Paulo Ricardo Petter; Knoppers,Bastiaan Adriaan; Cavalcante,Geórgenes Hilário; Souza,Weber Friederichs Landim de.
The aim of this study was to investigate the post-dam conditions of the loads and yields of dissolved inorganic nitrogen (DIN), orthophosphate (DIP, silicate (DSi) and total phosphorous (TP) in the Lower São Francisco river estuary (NE-Brazil) after the river was regulated to a constant flow by the dams. Loads and yields of monthly measurements performed from November 2000 to March 2002 at a gauging station downstream of the dams (80 km from the coast) showed 4.1 x 10³ t/yr and 0.006 t/km² /yr of DIN, 0.2 x 10³ t/yr and 0.002 t/km² /yr of DIP, and 448 x 10³ t/yr and 0.71 t/km² /yr of DSi, respectively. Over the last 15 years, DIN loads reduced by 94 % and DSi by 31%. The river turned into an oligotrophic system with primary production limited by nitrogen...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nutrients; Fluvial loads; Dam impacts; Estuary; São Francisco River (NE-Brazil).
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000200022

Food Preference of Cavia magna (Rodentia: Caviidae) on a Subtropical Island in Southern Brazil
Provedor de dados: 52
Autores: Veiga,Kelen Rodrigues da; Hefler,Sônia Marisa; Colares,Elton Pinto; Colares,Ioni Gonçalves.
Abstract This study aimed to link the plants consumed by Cavia magna and their availability in the environment, (Ilha dos Marinheiros) determining its food preference. In the environment, 96 species were recorded. Twenty-four plant species were identified in the fecal samples. There wasn’t significant difference in the composition of plant species among seasons, although the variation was significant between the island’s northern and southern areas concerning the fecal samples. Mantel test’s results supported that the availability of vegetation has significant influence on the species consumed. Being that the most consumed species (present on the feces) were distant to their distribution areas, we propose that C. magna of Ilha dos Marinheiros actively...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caviidae; Estuary; Herbivory; Rodent; Vegetation.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000100418

N:Si:P atomic ratio in the Santa Cruz Channel, Itamaracá-PE (Northeast Brazil): a nyctemeral variation
Provedor de dados: 52
Autores: Montes,Manuel de Jesús Flores; Macêdo,Silvio José de; Koening,Maria Luise.
Studies were carried out on the Inlets of Orange and Catuama at the Santa Cruz Channel, Itamaracá-PE, in the rainy and dry seasons, in a nyctemeral cycle, and in a transversal profile, with intervals of three hours between collections. The objective was to determine the spacial and temporal variation of the N:Si:P atomic ratio, and its possible inter-relations and dependencies, as well as the influence of the hydrodynamism provoked by the variation of the tides at different times of the year. Nitrite-N and nitrate-N were higher in the rainy season, while ammonia-N, phosphate-P and silicate-Si were higher in the dry season, which indicated different results than previous studies. The N:P atomic ratio was lower than 16:1, in all seasons and stations, being...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: N:Si:P atomic ratio; Dissolved nutrients; Estuary; Nyctemeral variation.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000200002

Feeding ecology of juvenile dog snapper Lutjanus jocu (Bloch and Shneider, 1801) (Lutjanidae) in intertidal mangrove creeks in Curuçá estuary (Northern Brazil)
Provedor de dados: 52
Autores: Monteiro,Dijane Pantoja; Giarrizzo,Tommaso; Isaac,Victoria.
The diet and feeding ecology of juvenile dog snapper (Lutjanus jocu) were investigated in 92 specimens collected in four intertidal mangrove creeks of Curuçá estuary, Northern Brazil, between September 2003 and July 2004. No significant differences in total length were found between the sampling months. Feeding intensity was high as indicated by high stomach fullness index and low vacuity index. The most important prey was Penaeidae, followed by Grapsidae and Porcellanidae. The diet of juvenile dog snapper showed clear seasonal differences. Specimens from dry season (September and November) and dry / wet season transition (January), were specialists feeding exclusively on Penaeidae. However, the specimens from wet season (March and May) and wet /dry season...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estuary; Feeding habits; Feeding strategy; Juvenile fish; Lutjanus jocu; Intertidal mangrove creek.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000600014

Spatial Variation of Bacteria in Surface Waters of Paranaguá and Antonina Bays, Paraná, Brazil
Provedor de dados: 52
Autores: Kolm,Hedda Elisabeth; Schoenenberger,Maria Fernanda; Piemonte,Mariana da Rocha; Souza,Patrícia S. de A.; Scühli,Guilherme Schnell e; Mucciatto,Mariele B.; Mazzuco,Roseli.
Spatial variability in the concentration of total bacteria, saprophytes and coliforms abundance was investigated in surface waters of Paranaguá and Antonina Bays. Six points along a profile from the entrance of Paranaguá Bay to the innermost part of Antonina Bay, were sampled on February 26, 1997. Temperature, salinity, dissolved oxygen, pH, particulate organic carbon, water transparency and seston were also measured. Determination of total bacterial abundance and biomass were made with the epifluorescent method. Saprophytic bacteria counts were conducted with ZoBell 2216E culture medium with fresh and 32‰ water and the coliform MPN was enumerated with the chromogenic substrate method. Principal component analysis of biotic and abiotic data showed a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacteria; Hydrographic variables; Estuary; Paranaguá and Antonina Bays.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000100005

Bacterial production in Guanabara Bay (Rio de Janeiro, Brazil) evaluated by ³H-leucine incorporation
Provedor de dados: 52
Autores: Gonzalez,Alessandra M.; Paranhos,Rodolfo; Andrade,Luciana; Valentin,Jean L.
The aim of this work was to evaluate the necessary ³H-leucine concentration to estimate bacterial production in Guanabara Bay through saturation curves. A second aim was to collect preliminary data of bacterial production in two distinct sites corresponding to different water qualities: Urca inlet and Governador Island. Saturation curves were made with water samples taken at the main circulation channel of the bay, Paquetá Island, and the two sites mentioned before. The ³H-leucine curves showed similar pattern for all studied areas, indicating the ideal isotope concentration to be 10 nM. Bacterial biomass production ranged from 0.40 to 4.53 µgC L-1 h-1 in Urca and from 3.86 to 73.72 µgC L-1 h-1 in Governador Island indicating the relationship between...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacterioplankton; Activity measurement; Heterothrophic production; Estuary; Water pollution; Eutrophication.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000500008

First Report of Albinism in the Threatened Gillbacker Sea Catfish Sciades parkeri (Siluriformes, Ariidae)
Provedor de dados: 52
Autores: Andrade,Marcelo C.; Schmid,Kurt; Souza Junior,Oswaldo; Giarrizzo,Tommaso.
ABSTRACT A sexually mature albino specimen of the Gillbacker Sea Catfish species Sciades parkeri (Siluriformes, Ariidae), a vulnerable species, was captured in northern Amazon estuary, State of Pará, Brazil. Herein we present the first record of albinism phenomenon for this species, including the morphometric description of the albino, and a non-abnormal coloring specimen.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon; Delta; Estuary; Marajó; Vulnerable.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132017000100416

Impacts of the construction of the Port of Suape on phytoplankton in the Ipojuca River estuary (Pernambuco-Brazil)
Provedor de dados: 52
Autores: Koening,Maria Luise; Leça,Enide Eskinazi; Neumann-Leitão,Sigrid; Macêdo,Silvio José de.
In order to address the impact on phytoplankton, sampling was conducted monthly at 4 fixed stations, from April/86 to March/87 at diurnal low and high tide using a plankton net (65 mum mesh size) and a 1 L Van Dorn bottle. Among the 133 taxa identified, marine littoral euryhaline species were most common, outranking Gyrosigma balticum (Ehrenberg) Rabenhorst, Nitzschia sigma (Kützing) Wm. Smith, Licmophora abbreviata Agardh, Climacosphenia moniligera Ehrenberg, Surirella febigerii Lewis, Terpsinoe musica Ehrenberg and Cylindrotheca closterium (Ehrenberg) Reiman and Lewis. The port construction caused significant changes to the phytoplankton community with a strong influence of marine species (mainly dinoflagellate) because of the opening of the reef near...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Phytoplankton; Environmental impacts; Estuary; Suape Port.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000100012

Evaluation of the Blue Crab Callinectes sapidus Rathbun, 1896 Bycatch in Artisanal Fisheries in Southern Brazil
Provedor de dados: 52
Autores: Ruas,Vinicius Mendes; Becker,Cintia; D’Incao,Fernando.
ABSTRACT   We evaluated the incidental catch of the blue crab in artisanal fisheries through the analysis of sex ratio, catch per unit effort, net positioning, and size in which the capture probability was 50% (P50). The specimens were collected from 2011 to 2013 in the estuary of Patos Lagoon, southern Brazil. The analysis showed a higher occurrence of males. Variations in the catch per unit effort showed greatest abundance values close to the mouth of the estuary. Catch per unit effort was similar when comparing fishing seasons and net positions. P50 indicated a low selectivity of the nets since it varied between studied areas but stayed below the size at first maturity. Catches indicated a greater effort on males, since females migrated to spawn in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachyura; Fishery resource; Patos Lagoon; Fyke net; Estuary.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132017000100448

Predicting biological parameters of estuarine benthic communities using models based on environmental data
Provedor de dados: 52
Autores: Rosa-Filho,José Souto; Bemvenuti,Carlos Emílio; Elliott,Michael.
This study aimed to predict the biological parameters (species composition, abundance, richness, diversity and evenness) of benthic assemblages in southern Brazil estuaries using models based on environmental data (sediment characteristics, salinity, air and water temperature and depth). Samples were collected seasonally from five estuaries between the winter of 1996 and the summer of 1998. At each estuary, samples were taken in unpolluted areas with similar characteristics related to presence or absence of vegetation, depth and distance from the mouth. In order to obtain predictive models, two methods were used, the first one based on Multiple Discriminant Analysis (MDA), and the second based on Multiple Linear Regression (MLR). Models using MDA had...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Prediction; Models; Benthos; Estuary; Southern Brazil.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000400015

Trace metal contamination in estuarine fishes from Vitória Bay, ES, Brazil
Provedor de dados: 52
Autores: Joyeux,Jean-Christophe; Campanha Filho,Edmar Augusto; Jesus,Honério Coutinho de.
Muscular tissue from wild-caught mullet (Mugil spp.) and snook (Centropomus spp.) was analyzed by atomic absorption spectrometry to determine muscle contamination levels for cadmium, chromium, copper, lead and zinc and evaluate risks to human health associated with seafood consumption. Fishes were captured by subsistence fishermen in Vitória Bay, a Brazilian tropical estuary with numerous outfalls of untreated industrial and residential sewage. Based on the premisses that subsistence fisherman and local consumer show weak (culinary or other) preferences within the taxa studied, analyses were conducted and results are reported for genera. Snook cadmium, chromium, copper and zinc concentrations were positively correlated with size or weight. Mullet chromium...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estuary; Cd; Cr; Cu; Pb; Zn; Snook; Mullet.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000500012

Changes in the diet composition of transitory fishes in coastal systems, estuary and continental shelf
Provedor de dados: 52
Autores: Chaves,Paulo T. C.; Umbria,Simone C.
The feeding habits of five species of teleosts in the southern coast of Brazil were analyzed comparatively between estuary and continental shelf. The displacement between the two sites caused expressive qualitative alterations, the proportion of different items varying from 50% in the diet of Micropogonias furnieri to 89% in Isopisthus parvipinnis. In the group of species, 57% of the items were exclusive to one of the environments and, within the three most common items in the estuary - fish, Polychaeta and plants, only the former was also among the most common items in the shelf. In spite of these differences, the high spectrum of items in both environments and the nature of the item that was most consumed in each one, indicate that there was a certain...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diet; Fish; Estuary; Continental Shelf; Brazil.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000100007

Reproduction and food habits of the lined seahorse, Hippocampus erectus (Teleostei: Syngnathidae) of Chesapeake Bay, Virginia
Provedor de dados: 57
Autores: TEIXEIRA,R. L.; MUSICK,J. A.
The reproductive and feeding biology of the lined seahorse, Hippocampus erectus, was studied in Chesapeake Bay. Seahorses are monogamous, and males incubate the eggs received from females in a closed brood pouch (= marsupium). Females do not play any parental care after mating. Total sex ratio and the operational sex ratio was strongly skewed toward females. Males and females had similar number of eggs/embryos and hydrated oocytes, respectively. The number of eggs/embryos found in the male brood pouch varied from 97 to 1,552 (fish from 80 to 126 mm TL), whereas the number of hydrated oocytes in female varied from 90 to 1,313 (fish from 60 to 123 mm TL). Both, the number of eggs/embryos and hydrated oocytes were better linearly correlated to total weight...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Parental care; Fecundity; Fertility; Amphipods; Estuary.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100011

Triceratium moreirae sp. nov. and Triceratium dubium (Triceratiaceae - Bacillariophyta) from estuarine environments of Southern Brazil, with comments on the genus Triceratium C. G. Ehrenberg
Provedor de dados: 57
Autores: FERNANDES,L. F.; SOUZA-MOSIMANN,R. M. de.
A new species of Triceratiaceae is described for estuarine environments of Southern Brazil. The valve of Triceratium moreirae sp. nov. is triangular with elevations bearing ocellus and a rimoportula in their basis. The valvar surface has robust pseudoloculi, circular to polygonal, each one confining a group of areolae arranged in a typical pattern. A central larger areola is surrounded by 5-8 smaller areolae, and they are poroidal with domed cribra. A septum emerges from the valvocopula, having the base reinforced by ribs and the margins folded to the innerside of the valve. The new species is compared to the closely related diatom Triceratium dubium, which has the same pattern of areolar disposition, formation of septum and pseudoloculi. The main...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Taxonomy; Diatom; Triceratium; Estuary; Mangrove; Southern Brazil.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100020

Short-term changes and longitudinal distribution of carbon metabolism in the Piauí River estuary (Sergipe, Brazil)
Provedor de dados: 57
Autores: SOUZA,M. F. L. de; COUTO,E. C. G.
Net pelagic metabolism (NPM) and net ecosystem metabolism (NEM) were assessed by sigmaCO2 changes in three sampling stations along Piauí River estuary. At the upper estuary station, sampling was carried out over 48 h. Samples exhibited high DIN:DIP ratios. Chlorophyll-a ranged from 0.2 to 2.5 mug.l-1, being higher at the upper estuarine station than marine ones. Net pelagic metabolic rates ranged from -13.2 to 61.2 mgC.m7-2.d-1. Presence of mucilaginous algal material can explain the net mineralization. In the photic period, NPM ranged from-0.05 to 3.04 mgC.m-2h-1. NEM ranged from -7.77 to 6.65 mgC.m-2.d-1. Bottom ressuspension due to microphytobenthic flotation and a high turbidity plume inside de estuary reflected in negative metabolic rates...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estuary; Short-term changes; Primary production; Mineralization; Microphytobenthos.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000200003

Preliminary assessment of heavy metal levels in Mytella falcata (Bivalvia, Mytilidae) from Bacanga River estuary, São Luis, State of Maranhão, Northeastern Brazil
Provedor de dados: 57
Autores: CARVALHO,G. P. de; CAVALCANTE,P. R. S.; CASTRO,A. C. L. de; ROJAS,M. O. A. I.
The concentrations of Cu, Zn, Pb, and Cd were determined in the mussel Mytella falcata from the Bacanga River estuary, in order to evaluate the potential role of domestic effluents released "in natura" on the quality of the estuarine environment with consequences to shellfish resources. Cu concentrations ranged from 5.2 mg.g-1 to 13.1 mg.g-1, while Zn concentrations ranged from 49.1 mg.g-1 to 76.3 mg.g-1. Pb and Cd showed concentrations lower than 2 mg.g-1. The results showed low concentrations of Cu, Pb and Cd in the filter-feeding Mytella falcata in the study area in comparison with the maximum values stablished to foods by the Brazilian Government (Decree Law Nº 55,871). Finally, Zn presented slightly higher values than the maximum ones stablished by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Bivalves; Mytella falcata; Estuary; Pollution.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100003

Liver oxidative stress of the grey mullet Mugil cephalus presents seasonal variations in Ennore estuary
Provedor de dados: 56
Autores: Padmini,E.; Vijaya Geetha,B.; Usha Rani,M.
The objective of this study was to determine the liver oxidative stress status of grey mullets living in heavy-metal-rich polluted Ennore estuary compared with unpolluted Kovalam estuary. Fish were collected from both estuaries during the monsoon and summer seasons from October 2004 to September 2006. Fish liver homogenate (N = 20 per group) was prepared for evaluating oxidative stress parameters. Fish living in the polluted estuary had significantly higher lipid oxidation products, conjugated dienes (0.346 ± 0.017 vs 0.141 ± 0.012 DA233/mg protein), lipid hydroperoxides (0.752 ± 0.032 vs 0.443 ± 0.03 nmol/mg protein), and lipid peroxides (3.447 ± 0.14vs 1.456 ± 0.096 nmol MDA/mg protein) than those of the unpolluted estuary during the summer. In contrast,...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Antioxidant defense; Estuary; Grey mullets; Oxidative stress; Pollutants.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2008001100002

Characterization of Aeromonas species isolated from an estuarine environment
Provedor de dados: 58
Autores: Evangelista-Barreto,Norma Suely; Carvalho,Fatima Cristiane Teles de; Vieira,Regine Helena S. dos Fernandes; dos Reis,Cristhiane Moura Falavina; Macrae,Andrew; Rodrigues,Dália dos Prazeres.
Thirty water samples were collected, at two week intervals, from the estuary of the River Cocó. The aim was to characterize the presence, distribution and types of Aeromonas spp, in the estuary of the River Cocó, Ceara, Brazil (03º46'28.83''S e 38º26'36.52''S). Aeromonas were identified in 19 (63%) samples analyzed by plating and CFU counts. Presence/absence tests were positive for 11 (37%) of the samples resulting in the detection of Aeromonas in a total of 23 (77%) of samples. CFU counts varied from &lt; 10 to 1.4 x 10(4) CFU mL-1 . From the isolated strains seven species of Aeromonas were identified: A. caviae (29/69), A. veronii bv. sobria (13/69), A. veronii bv. veronii (8/69), A. trota (6/69), A. media (5/69), A. sobria (4/69) and A. hydrophila and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aeromonas; Estuary; Antibiotics.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822010000200027