Consulta: subjectFacets:"River"
Registros recuperados: 28
Data/hora: 01/06/2024 08:09:02

Social success of in-stream habitat improvement: from fisheries enhancement to the delivery of multiple ecosystem services
Provedor de dados: 7
Autores: Marttila, Maare; Natural Resources Institute Finland (Luke), Management and Production of Renewable Resources; University of Oulu, Department of Ecology; maare.marttila@luke.fi; Karjalainen, Timo P; University of Oulu, Water Resources and Environmental Engineering Research Group; timo.p.karjalainen@oulu.fi.
Stream restoration often aims to enhance fisheries by improving stream conditions for target fish species. However, river restoration has a potential impact on a variety of ecosystem services. Among stakeholders, the emerging expectations about restoration attain different priorities. How well these expectations are met influences social perceptions of success or failure. Although public support for restoration is known to have a significant impact on the sustainability and overall success of restoration, social aspects are rarely considered in this context. To address these issues, we conducted a questionnaire study among the residents and fishermen of three recently restored rivers in Finland. Results indicate that both user groups highly supported the...
Tipo: Peer-Reviewed Reports
Palavras-chave: Benefits; Cultural value; Evaluation; Perception surveys; Public satisfaction; Restoration; River.
Ano: 2016

Manager perspectives on communication and public engagement in ecological restoration project success
Provedor de dados: 7
Autores: Druschke, Caroline Gottschalk; University of Rhode Island; cgd@uri.edu; Hychka, Kristen C.; U.S. EPA, Atlantic Ecology Division; khychka@gmail.com.
We look to a particular social-ecological system, the restoration community in Rhode Island, USA and the rivers, wetlands, marshes, and estuaries they work to protect, to draw connections between communication, community involvement, and ecological restoration project success. Offering real-world examples drawn from interviews with 27 local, state, federal, and nonprofit restoration managers, we synthesize the mechanisms that managers found effective to argue that the communication employed by resource managers in each phase of the restoration process, in prioritization, implementation, and monitoring, and for garnering broad-based support, shapes the quality of public engagement in natural resources management, which, in turn, can impact the stakeholder,...
Tipo: Peer-Reviewed Reports
Palavras-chave: Adaptive comanagement; Adaptive management; Communication; Discourse analysis; Natural resource management; Public engagement; Public participation; Restoration; River; Stakeholder engagement; Water.
Ano: 2015

Demonstration Restoration Measures in Tributaries of the Vindel River Catchment
Provedor de dados: 7
Autores: Holmqvist, Daniel; Vindel River Fishery Advisory Board; daniel.holmqvist@lycksele.se.
Some ecological restoration projects include elements of trial and error where new measures are repeatedly tried, evaluated, and modified until satisfactory results are achieved. Thereafter, the resulting methods may be applied on larger scales. A difficult step is judging whether developed &amp;#8220;best-practice&amp;#8221; methods have become reasonably ecologically functional or whether further experimentation &amp;#8220;demonstration&amp;#8221; methods can lead to yet better results. Here, we use a stream restoration project as a case study for evaluating methods and abiotic effects and outlining stakeholder support for demonstration restoration measures, rather than only using best-practice methods. Our work was located in the Vindel River system, a...
Tipo: Peer-Reviewed Reports
Palavras-chave: Boulders; Large wood; Northern Sweden; Restoration; River; Stream; Timber floating.
Ano: 2013

Anais...
Provedor de dados: 14
Autores: SIMPOSIO SOBRE RECURSOS NATURAIS E SOCIO-ECONOMICOS DO PANTANAL, 1., 1984, Corumba.
A publicacao do evento apresenta temas sobre recursos naturais, mostrando a pesquisa desenvolvida no Pantanal, enfocando o sistema climatico, hidrologia, aspectos geologicos e geomorfologicos, solos, vegetacao, flora, fauna, os problemas e perspectivas socio-economicos, propostas de politicas de desenvolvimento da regiao. Sumario - O sistema climatico do Pantanal: compreensao do sistema a definicao de prioridades de pesquisa climatologica. Condicoes climaticas para a regiao do Pantanal Mato-Grossense. Hidrologia da Bacia do Alto Paraguai. A dinamica das inundacoes no Pantanal. Aspectos geologicos do Pantanal Mato-Grossense e de sua area de influencia. Contribuicao da geomorfologia para o conhecimento e valorizacao do Pantanal. Solos do Pantanal...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Congresso; Mato Grosso do Sul; Recurso socio-economico; Recursos hidricos; Natural resource; Socio-economic resource; River; Congress.; Climatologia; Fauna; Flora; Geomorfologia; Geologia; Recurso Natural; Solo; Vegetação.; Brazil; Pantanal; Climatology; Geomorphology; Geology; Soil; Vegetation.
Ano: 1986
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/787689

Mercury in the Lot-Garonne River system (France): Sources, fluxes and anthropogenic component
Provedor de dados: 5
Autores: Schafer, J; Blanc, Gerard; Audry, S; Cossa, Daniel; Bossy, C.
Dissolved and particulate Hg fluxes in the Lot-Garonne-Gironde fluvial-estuarine system were obtained from observation of daily discharge and suspended particulate matter (SPM) concentrations. In addition to the measurements of the total dissolved (&lt; 0.45 gm) and particulate Hg (&gt; 0.45 gm), called HgTD and HgTp respectively, the dissolved inorganic Hg species (HgRD) were determined monthly. Geochemical background values for HgTp in sediments and SPM were similar to crustal values and to typical concentrations in SPM of non-contaminated river systems, respectively. The Riou Mort watershed already known as the origin of important historical polymetallic (e.g., Cd, Zn) pollution was identified as an important Hg point source. In the downstream Lot...
Tipo: Text
Palavras-chave: Lot; Garonne; SPM; River; Organic matter; Mercury.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1343.pdf

The mighty Susquehanna-extreme floods in Eastern North America during the past two millennia
Provedor de dados: 5
Autores: Toomey, Michael; Cantwell, Meagan; Colman, Steven; Cronin, Thomas; Donnelly, Jeffrey; Giosan, Liviu; Heil, Clifford; Korty, Robert; Marot, Marci; Willard, Debra.
The hazards posed by infrequent major floods to communities along the Susquehanna River and the ecological health of Chesapeake Bay remain largely unconstrained due to the short length of streamgage records. Here we develop a history of high‐flow events on the Susquehanna River during the late Holocene from flood deposits contained in MD99‐2209, a sediment core recovered in 26 m of water from Chesapeake Bay near Annapolis, Maryland, USA. We identify coarse‐grained deposits left by Hurricane Agnes (1972) and the Great Flood of 1936, as well as during three intervals that predate instrumental flood records (~1800‐1500, 1300‐1100 and 400‐0 CE). Comparison to sedimentary proxy data (pollen and ostracode Mg/Ca ratios) from the same core site indicate that...
Tipo: Text
Palavras-chave: Hurricane; Flood; Holocene; East coast; River; Chesapeake.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00483/59447/62291.pdf

Hydrological and biogeochemical dynamics of the minor and trace elements in the St. Lawrence River
Provedor de dados: 5
Autores: Rondeau, B; Cossa, Daniel; Gagnon, P; Pham, T; Surette, C.
Surface water samples from the St. Lawrence River were collected in order to study the processes controlling minor and trace elements concentrations (Al, Fe, Mn, Cd, Co, Cu, Ni and Zn), and to construct mass balances allowing estimates of the relative importance of their natural and anthropogenic sources. The two major water inputs, the upper St. Lawrence River, which drains waters originating from the Lake Ontario, and the Ottawa River were collected fortnightly over 18 months. In addition, other tributaries were sampled during the spring floods. The output was monitored near Quebec City at the river mouth weekly between 1995 and 1999. Dissolved metal concentrations in the upper St. Lawrence River carbonated waters were lower than in the acidic waters of...
Tipo: Text
Palavras-chave: St. Lawrence; Mass balance; River; Biogeochemistry; Trace element.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-1357.pdf

Daily and seasonal estimates of the recruitment and biomass of glass eels runs (Anguilla anguilla) and exploitation rates in the Adour open estuary (Southwestern France)
Provedor de dados: 5
Autores: Bru, Noelle; Prouzet, Patrick; Lejeune, Michel.
The European eel (Anguilla anguilla) is drastically declining in all its distribution area and listed in the red list of the IUCN (International Union for Conservation of Nature). A rebuilding plan was adopted at European level in 2007, Regulation R(CE) 100/2007, to restore eel abundance to the level observed during the seventies. Its implementation started on the 1(st) of January 2009. This species is heavily threatened by numerous activities including fishing, and its management can only be effective through a systemic approach minimizing the whole range of human-induced impacts on the resource and its habitat. In the framework of the European interregional programme INTERREG IIIB-Atlantic Area-the INDICANG project aimed at elaborating abundance...
Tipo: Text
Palavras-chave: Biomass estimates; Exploitation rate; Time series; River; Glass eel; Anguilla anguilla.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00000/11170/7526.pdf

Nutrient fluxes to the Bay of Biscay from Cantabrian rivers (Spain)
Provedor de dados: 5
Autores: Prego, R; Vergara, J.
Nutrient fluxes to the Bay of Biscay from the Cantabrian basin have been quantified for the first time. Data between 1981 and 1995 of the main 16 Cantabrian rivers from the COCA monitoring programme have been used. Values of water flow and dissolved inorganic nitrogen (DIN), phosphate and silicate concentrations have been taken. Equations are proposed to quantify the fluvial nutrient contributions to the Cantabrian Sea. The annual average of continental outputs to the Bay of Biscay from the Cantabrian basin is 16.1 x 10(9) m(3) of freshwater, 1.0 x 10(9) mol of N in DIN, 0.062 x 10(9) mol of phosphate and 1.2 x 10(9) mol of silicate. In comparison with the French rivers, those of the Cantabrian have small fluxes and their outflow is very disperse, not...
Tipo: Text
Palavras-chave: Nitrate; Phosphate; Silicate; Fleuve; Côte Cantabrique; Nitrate; Phosphate; Silicate; River; Cantabrian coast.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00326/43685/43190.pdf

Adaptation of copper community tolerance levels after biofilm transplantation in an urban river
Provedor de dados: 5
Autores: Fechner, Lise C.; Versace, Francois; Gourlay-france, Catherine; Tusseau-vuillemin, Marie-helene.
The Water Framework Directive requires the development of biological tools which can act as early-warning indicators of a sudden increase (accidental pollution) or decrease (recovery due to prevention) of the chemical status of aquatic systems. River biofilms, which respond quickly to modifications of environmental parameters and also play a key part in the functioning of aquatic ecosystems, are therefore good candidates to monitor an increase or a decrease of water pollution. In the present study, we investigated the biological response of biofilms transplanted either upstream (recovery) or downstream (deterioration of exposure levels) the urban area of Paris (France). Both modifications of Cu community tolerance levels and of global bacterial and...
Tipo: Text
Palavras-chave: River; Biofilm; PICT; ARISA; Urban contamination; Transplantation.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00070/18129/16053.pdf

Vers une modélisation déterministe des écoulements de surface en Nouvelle-Calédonie. Implémentation du code GR4H sur quatre bassins versants du Grand Nouméa
Provedor de dados: 5
Autores: Desclaux, Terence; Pischedda, Marine; Lemonnier, Hugues; Soulard, Benoit; Le Gendre, Romain.
Ce rapport fait suite au stage de Marine Pischedda (Master 2 La Rochelle) réalisé au sein de l’unité de recherche "Lagons, Ecosystèmes et Aquaculture Durable en Nouvelle-Calédonie" (LEAD/NC) de l’Ifremer entre février et juillet 2016. Cette étude a été conduite sur quatre bassins versants du Grand Nouméa : la Coulée, la Dumbéa Est, la Dumbéa Nord et la Couvelée. L’objectif principal était de démontrer la pertinence de l’utilisation de modèle pluie-débit au pas de temps horaire (GR4H en l’occurrence) sur les bassins versants calédoniens. Le cadre plus général de ce travail était d’aboutir à une représentation affinée du continuum terre-mer par le couplage des modèles GR4H et MARS3D développés pour simuler la circulation côtière. Les périodes d’étiages ayant...
Tipo: Text
Palavras-chave: Continuum Terre-Lagon; Nouvelle-Calédonie; Rivières; GR4H; Bassins versants; Grand Nouméa; Modélisation; Débits; Land-lagoon continuum; New Caledonia; River; GR4H; Watershed; Nouméa; Model; River Flow.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00388/49969/50545.pdf

Dietary breadth and trophic position of introduced European catfish Silurus glanis in the Tarn River (Garonne River basin), southwest France
Provedor de dados: 5
Autores: Syvaeranta, Jari; Cucherousset, Julien; Kopp, Dorothee; Crivelli, Alain; Cereghino, Regis; Santoul, Frederic.
Although being a widely introduced and successfully established species, the European catfish Silurus glanis L. (the world’s third largest freshwater fish) remains poorly studied in its introduced areas. Here we studied the trophic ecology of non-native European catfish in a large river system in south-western France using stomach content and stable isotope analyses (SIA). We used fin samples for SIA of catfish and hence tested the validity of using fin tissue as a proxy for muscle in SIA. The mean δ15N and δ13C values analysed from fin tissues did not differ from those analysed from muscle tissue and reflected strong and consistent relationships (r2 = 0.95 for carbon and r2 = 0.98 for nitrogen). The δ15N values varied almost 5‰ among the analysed catfish...
Tipo: Text
Palavras-chave: Stable isotopes; Introduced species; Top predator; River; Food web; Fin clips.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00168/27896/26159.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

Iron isotope systematics in Arctic rivers
Provedor de dados: 5
Autores: Escoube, Raphaelle; Rouxel, Olivier; Pokrovsky, Oleg S.; Schroth, Andrew; Holmes, Robert Max; Donard, Olivier F. X.
The input of iron to the Arctic Ocean plays a critical role in the productivity of aquatic ecosystems and is potentially impacted by climate change. We examine Fe isotope systematics of dissolved and colloidal Fe from several Arctic and sub-Arctic rivers in northern Eurasia and Alaska. We demonstrate that the Fe isotopic (δ56Fe) composition of large rivers, such as the Ob’ and Lena, has a restricted range of δ56Fe values ca.–0.11 ± 0.13‰, with minimal seasonal variability, in stark contrast to smaller organic-rich rivers with an overall δ56Fe range from–1.7 to + 1.6‰. The preferential enrichment with heavy Fe isotopes observed in low molecular weight colloidal fraction and during the high-flow period is consistent with the role of organic complexation of...
Tipo: Text
Palavras-chave: Iron isotope; Colloids; River; Weathering; Arctic; Iron speciation.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00273/38402/36865.pdf

Species or population? Systematic status of Vieja coatlicue (Teleostei: Cichlidae)
Provedor de dados: 83
Autores: McMahan,Caleb D.; Matamoros,Wilfredo A.; Elías,Diego J.; Piller,Kyle R.
ABSTRACT Pacific and Atlantic-slope rivers of the Isthmus of Tehuantepec in Mexico contain two cichlid species of the genus Vieja relevant to the current study, V. zonata and V. coatlicue, respectively. The Atlantic-slope species was initially considered a population of uncertain taxonomic status and recently described as a distinct species based on three putatively diagnostic morphological characters. The objective of this study was to combine new and existing genetic data, along with reanalysis of morphological characters, to test the distinctiveness of V. coatlicue. Little genetic variability and no geographic structuring were recovered. Additionally, putatively diagnostic morphological character states were present across both species, failing to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cichlid; Freshwater; Mexico; River; Taxonomy.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000200204

The fish fauna of Brokopondo Reservoir, Suriname, during 40 years of impoundment
Provedor de dados: 83
Autores: Mol,Jan H.; Mérona,Bernard de; Ouboter,Paul E.; Sahdew,Shamita.
We investigated long-term changes in the fish fauna of Brokopondo Reservoir, Suriname, the first large reservoir (1560 km²) that was created in tropical rainforest. Before closure of the dam in 1964, the fish fauna of Suriname River had 172 species, high diversity and high evenness. The riverine fauna was dominated by small-sized species, but no single species was dominant in numbers. Large catfishes were dominant in biomass. Species were evenly distributed over riverine habitats: rapids, tributaries and main channel. Four years after closure of the dam, only 62 fish species were collected from Brokopondo Reservoir, but the composition of the fish fauna was still changing. The reservoir fauna in 1978 was very similar to the reservoir fauna in 2005,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dam; Man-made lake; Neotropical; River; Fish community.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000300015

Going against the flow: Effects of river damming in Cuban fisheries
Provedor de dados: 20
Autores: Baisre, J. A.; Arboleya, A.
Over the last decade eutrophication of freshwater artificial reservoirs in Cuba occurred in parallel to oligotrophication of estuarine and coastal waters. These two processes influenced both freshwater and marine fisheries. A dramatic shift in species composition in freshwater fisheries has occurred, from dominance by cichlids (tilapia) to dominance by cyprinids. The high fishery yield from some reservoirs, and shift in species composition, seems related to progressive eutrophication of reservoirs by nutrient subsidies from different anthropogenic activities; particular those related to the size of urban areas within their watersheds. On the other hand, marine landings of estuarine-dependent species declined more significantly than for other groups...
Tipo: Journal Contribution
Palavras-chave: Fisheries; Eutrophication; River.
Ano: 2006
URL: http://hdl.handle.net/1834/5110

Assessment of ammonia toxicity in contaminated sediments in the upper Scheldt (Belgium): the development and application of toxicity identification evaluation procedures
Provedor de dados: 27
Autores: Van Sprang, P.; Janssen, C.R.; Sabayasachi, M.; Benijts, F.; Persoone, G.
The toxicity of sediment pore waters from 4 sites in the Upper Scheldt war characterized using modified Toxicity Identification Evaluation (TIE) procedures The samples from all locations exhibited acute toxicity to the freshwater crustacean Thamnocephalus platyurus. The IIE approach was conducted using an enlarged battery of fractionation tests. Toxicity was removed or reduced significantly by the cation exchange resins and the air-stripping test at pH 11. Additionally, increased toxicity war observed at higher pH while a reduced toxicity war found at a decreased pH. From these TIE studies, ammonia war identified as the dominant toxic agent.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Metals; River; Toxicants; Water.
Ano: 1996
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7459

Steltloper populaties en macrozoobenthos in een veranderend estuarium: de Oosterschelde (Nl.) = Wader populations and macrozoobenthos in a changing estuary: the Oosterschelde (The Netherlands)
Provedor de dados: 27
Autores: Meire, P.
Habitat verlies en degradatie is één van de belangrijke ecologische problemen van deze eeuw. Hoewel alle ecosystemen hieronder te lijden hebben, blijken wetlands of waterrijke gebieden, op wereldschaal vrij zeldzame gebieden, onder zeer zware antropogene druk te staan. Het is daarom ook niet te verwonderen dat deze ecosystemen sinds meerdere jaren een belangrijke prioriteit vormen voor het natuurbehoud. Binnen de wetlands vormen estuaria zeer produktieve systemen waarvan het rijke voedselaanbod wordt benut door grote aantallen steltlopers, die buiten het broedseizoen bijna volledig op dergelijke getijdengebieden zijn aangewezen. Het belang van het Deltagebied (NI.) en met name de getijdengebieden van Ooster- en Westerschelde voor watervogels worden kort...
Tipo: Info:eu-repo/semantics/doctoralThesis
Palavras-chave: Benthos; Birds; Estuaries; River; Water.
Ano: 1993
URL: http://www.vliz.be/imisdocs/publications/5961.pdf

Dispersão de Lernaea cyprinacea (Linnaeus) (Crustácea, Copepoda) na região norte do estado do Paraná, Brasil
Provedor de dados: 104
Autores: Gabrielli,Mário Artur; Orsi,Mário Luís.
Inside of the parasitoses context in fish, the study was successful to us verified the lerniose was present in the north area of the State. It had reached the native fish in the basin of the river Tibagi. For the study, visits were made to the aquaculture and samples collected in the area of Sertanopolis on the river Tibagi. We verified that the lerniose was growing in the area and had already reached several species of native fish of the river Tibagi. This concein for ali the researchers of the area, as well as the producers of fish.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lernaea cyprinacea; Tibagi; Paranapanema; River.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752000000200010

Comunidades de esponjas do curso superior dos rios Paraná (Goiás) e Paraguai (Mato Grosso), Brasil, com redescrição de Oncosclera schubarti (Bonetto &amp;amp; Ezcurra de Drago)
Provedor de dados: 104
Autores: Batista,Twiggy Cristina Alves; Volkmer-Ribeiro,Cecília.
An extensive survey for freshwater sponges was carried at the temporarely exposed rocky bottoms of river Corumbá at Goiás State and river Manso at Mato Grosso State. The exposure resulted from the closing of the dams for lake formation at the respective Hidreletric Power Plants. Drulia uruguayensis Bonetto &amp;amp; Ezcurra de Drago, 1968, Corvospongilla seckti Bonetto &amp;amp; Ezcurra de Drago, 1966 and Trochospongilla repens (Hinde, 1888) were seen to be common to both rivers. Eunapiusfragilis (Leidy, 1851), Oncosclera navicella (Carter, 1881) and O. petricola (Bonetto &amp;amp; Ezcurra de Drago, 1969) were yet found in river Manso and O. schubarti (Bonetto &amp;amp; Ezcurra de Drago, 1967) in river Corumbá. O. schubarti is redescribed and SEM...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sponges; Oncosclera schubarti; Neotropical; River; Benthic assemblages.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752002000100010

Introdução de espécies de peixes por escapes acidentais de tanques de cultivo em rios da Bacia do Rio Paraná, Brasil
Provedor de dados: 104
Autores: Orsi,Mário L; Agostinho,Ângelo A.
Species composition and abundance of fishes that escaped from aquaculture facilities during catastrophic flooding in the Paranapanema and Tibagi rivers, in January, 1997 was estimated. In all , 1,292,000 adult individuais belonging to 11 species and 1 hybrid, were introduced into these rivers; only one species was native. The disaster is attributed to the illegal occupation of the river banks, and the non observance of standard measures designed to avoid escapement.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Species introduction; Tibagi river; Paranapanema; River.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751999000200020

Seasonality of nematode larvae in Iguanodectes spilurus (Characidae) an ornamental fish from northeastern Para, Brazil
Provedor de dados: 36
Autores: Fujimoto,Rodrigo Yudi; Anjos,Ellem Cristina Silva dos; Ramos,Fabrício Menezes; Martins,Maurício Laterça.
The current study presents a parasitological survey of larval nematodes from freshwater ornamental fish Iguanodectes spilurus caught in the watercourse of the Caete River, in the northeast region of the State of Para, Brazil. A total of 176 specimens, 1.36±0.75 g weight and 5.53±0.98 cm total length, were analyzed. Nematode larvae were identified as Capillaria sp., Procamallanus sp. and Anisakidae, with prevalence of 70.45% and infection intensity ranging from 1.81 to 4.70 larvae. The highest prevalence 57.38% occurred in the liver, but no seasonality was observed, indicating high infection throughout the year. Seasonality was observed in fish parasitized in the stomach, intestine and caecum, with prevalence and mean intensity of 17.61% and 2.32 parasites,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Characidae; Parasitology; Seasonality; River.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672013000400013

Taxonomic studies of centric diatoms (Diatomeae): unusual nanoplanktonic forms and new records for Brazil
Provedor de dados: 39
Autores: Cavalcante,Kaoli Pereira; Tremarin,Priscila Izabel; Ludwig,Thelma Alvim Veiga.
There have been few taxonomic studies of centric diatoms in lotic freshwater environments in Brazil, especially in terms of those including nanoplanktonic forms, which are often neglected in studies of local floras, because of their small size or confusing taxonomy. This is the first study focusing on centric diatoms in the flora of the state of Bahia, in northeastern Brazil. Plankton and periphyton attached to Eichornia crassipes were collected in the winter of 2009 in the Cachoeira River. The diatoms were analyzed and described under light and electron microscopies. Seventeen infrageneric taxa were identified. Cyclotella was represented by five taxa, and concerning of similarities between diacritical features of species in this genus, their descriptions...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bahia; Coscinodiscophyceae; Freshwater; Mediophyceae; River.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000200001

Phytoplankton of two rivers in the eastern Amazon: characterization of biodiversity and new occurrences
Provedor de dados: 39
Autores: Cunha,Elane Domênica de Souza; Cunha,Alan Cavalcanti da; Silveira Jr,Arialdo Martins da; Faustino,Silvia Maria Mathes.
During the various hydrological periods in 2011, we studied the phytoplankton along an 87-km stretch of the Araguari and Falsino rivers, which are located in the eastern Brazilian Amazon, in the state of Amapá, Brazil, the most ecologically preserved state in the country. In the study area, the aquatic ecosystem is under pressure from human activities such as, mining, hydroelectric power generation and urbanization, which contrast with the surrounding areas that are designated for biodiversity conservation. The aim of this study was to characterize the composition, frequency and richness of algae species and also to identify spatial-temporal patterns of taxa distribution. During the study period, we identified 185 taxa (136 species in 49 genera). The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Algae; Amapá; Floristic survey; Reservoir; River.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000200011

Spatial changes in the water quality of Itajaí-Açú Fluvial-Estuarine System, Santa Catarina, Brazil
Provedor de dados: 42
Autores: Pereira-Filho,Jurandir; Rörig,Leonardo R.; Schettini,Carlos A.F.; Soppa,Mariana A.; Santana,Bruno L.; Santos,José Eduardo dos.
This study was carried out with the aim of evaluating the spatial variation of the water quality in the Itajaí-Açú River estuary. Seven stations along the estuary were monitored on a weekly basis, from October 2003 to December 2004, plus two stations in tributaries (Itajaí-Mirim River, the main tributary, and one reference station). This monitoring included measurements of salinity, pH, dissolved oxygen, temperature, nutrients(NH+4,NO3-2,NO-3,PO3-4,H4SiO4) Biochemical Oxygen Demand (BOD), total phosphorous and dissolved organic phosphorus (TP and DOP), particulate organic carbon (POC), suspended particulate matter (SPM) and chlorophyll-a (Cla). Multivariate analyses demonstrated the compartmentalization of the system based on the deterioration in water...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Itajaí Estuary; Nutrients; Organic matter; River; Santa Catarina.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400019

Effect of Heavy Metals on Liver, Kidney, Gills and Muscles of Cyprinus carpio and Wallago attu inhabited in the Indus
Provedor de dados: 52
Autores: Mahboob,Shahid; Kausar,Shazia; Jabeen,Farhat; Sultana,S.; Sultana,T.; Al-Ghanim,K.A.; Hussain,Bilal; Al-Misned,Fahad; Ahmed,Z.
ABSTRACT: The present study was aimed to evaluate the effect of heavy metals on an important tissue of two fish species Cyprinus carpio and Wallago attu, sampled from the Indus river, Mianwali District, Pakistan. The concentration of selected heavy metals Fe, Cr, Cu, and in gills, muscles, kidney and liver was compared with an International standard of food fish. The overall metal concentrations among different weight categories in C. carpio were in the order of Fe &gt; Cu &gt; Cr &gt;. In W. attu the overall accumulation of these metals were, in order of Fe &gt; Cu &gt; Cr &gt; Pb The order of accumulation of metals in gills and muscle of C. carpio was Fe &gt; Cr &gt; Pb &gt; Cu; kidney and muscles of W. attu was Fe &gt; Cr &gt; Cu &gt; Pb; liver Fe &gt;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: River; Heavy metals; Fish; Weight; Pollution.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132016000100334

Heavy Metals in Garra gotyla , Cyprinus carpio and Cyprinion watsoni from the River Panjkora, District, Lower Dir, Khyber Pakhtunkhwa, Pakistan
Provedor de dados: 52
Autores: Ullah,Sana; Hussain,Zaqhim; Mahboob,Shahid; Al-Ghanim,Khalid.
ABSTRACT This study was conducted in the River Panjkora, Pakistan, in order to assess the level of heavy metals accumulated in the liver, kidneys, gills and muscle tissues of three highly consumed fish species by the local community, Garra gotyla, Cyprinus carpio and Cyprinion watsoni. The heavy metals including manganese (Mn), iron (Fe), chromium (Cr), zinc (Zn), lead (Pb), cadmium (Cd) and nickel (Ni) were determined in the collected fish specimens through an atomic absorption spectrophotometer. Level of heavy metals significantly varied depending upon tissues type and fish species. Cyprinus carpio accumulated highest concentration of heavy metals, followed by Garra gotyla while Cyprinion watsoni accumulated least concentration of heavy metals. All the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: River; Control site; Tissues; Pollution; Heavy Metals.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132016000100702