Consulta: subjectFacets:"Indicator species"
Registros recuperados: 38
Data/hora: 05/06/2024 06:43:38

Relationship among grain-size, plant communities, and fluvial and eolian processes in a piedmont of the central Andes in Argentina
Provedor de dados: 67
Autores: González Loyarte,María M.
The relationship among modern geomorphological processes, grain-size of surface sediments, and vegetation was analyzed in an alluvial fan in the piedmont of the Cordillera Frontal (Andes Mountains). Statistical parameters of grain-size distribution were calculated according to a standard graphical method. Plant communities were studied by applying a standard floristic-ecological method. A sensitivity analysis of grain-size parameters and plant communities in relation to geomorphological processes was made, based on literature, to compare results. Indicator species of fluvial, eolian and soil erosion processes were identified. Contemporary surface modifications by fluvial and eolian processes produce distinct surface sediment size parameters (mean diameter,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Grain-size analysis; Plant communities; Fluvial/eolian processes; Phytosociology; Indicator species.
Ano: 2003
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2003000100004

Freshwater sponges (Porifera, Demospongiae) indicators of some coastal habitats in South America: redescriptions and key to identification
Provedor de dados: 76
Autores: Volkmer-Ribeiro,Cecilia; Machado,Vanessa de Souza.
Surveys for freshwater sponges were performed at several water bodies at sandy environments along a north-south direction of particularly the Brazilian coastal line. The results allowed for the distinction of four different species-specific environments along this coastal border. The main fact considered was the dominant or the sole recurrent occurrence of a single sponge species at one particular habitat. The first one is that of the lagoonal mesohaline habitats at the tropical and subtropical realms, indicated by Spongilla alba Carter, 1849. The second one refers to shallow ponds among dunes at the tropical area indicated by Corvoheteromeyenia heterosclera (Ezcurra de Drago, 1974). The third one is that of also shallow ponds close to the dune belt at the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Freshwater sponges; Indicator species; Sandy coastal environments; Paleo-reconstructions; South America.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212007000200005

Mise en evidence et evaluation de l'enrichissement bacterien du film de surface des eaux littorales d'effluents urbains
Provedor de dados: 5
Autores: Beucher, M; Plusquellec, A; Legal, Y; Cleret, J.
Sea water samples were collected in the vicinity of urban non-treated, urban treated and industrial outfalls. The samples belonged to two differents types: the first one consisted of the surface film, the second was the corresponding water at 50 cm depth. The enumeration of the bacteria in both types of samples indicated a significant concentration of the mesophilic flora and of the indicators of fecal pollution in the surface film. The value of the concentrating factor depended largely on the nature of the sewage and did not reflect differences between the various bacterial groups. At one of the stations a very significant regression was demonstrated between surface sample and depth sample.
Tipo: Text
Palavras-chave: Bacteria; Bacteriology; Bacterial counters; Industrial wastes; Pollution indicators; Coastal waters; Microbial contamination; Indicator species; Sewage; Outfalls; Surface films.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-1006.pdf

Impact biosedimentologique d'amenagements portuaires en estuaire de Seine
Provedor de dados: 5
Autores: Desprez, M; Dupont, J.
Many harbour installations have reduced the intertidal zone and involved estuary choking by marine sediments. In 1980, weirs were built in dikes of navigation channels. This study strikes the balance of their impact on estuarine biofacies and points out indicator species for the study of biological impact of environmental design.
Tipo: Text
Palavras-chave: Indicator species; Biofacies; Estuarine sedimentation; Benthos; Port installations; Environmental impact; Coastal zone management.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1314.pdf

Comparaison de methodes directes (microscopiques) et indirectes (par mise en culture) dans l'evaluation d'une pollution bacterienne d'origine fecale. Etude preliminaire
Provedor de dados: 5
Autores: Munro, P; Bianchi, M.
Cells of two serotypes of Escherichia coli (O26B6 and 0111B4) were counted using epifluorescence and immunofluorescence microscopy (nonavalent serum) and plate count on specific medium. Values from indirect counts were 10 fold smaller than those from both microscopic counts. In a sample of sea water from an area receiving a fecal pollution, the highest number of bacteria was obtained by epifluorescence microscopy. In that case, the number of cells counted by immunofluorescence microscopy was 10 fold smaller than the number of bacteria able to grow on the medium. It could be due to: the diversity of the natural community, the possibility to other bacteria than E. coli to grow on the used culture medium, the restrictiveness of the serum for "pathogenic...
Tipo: Text
Palavras-chave: Escherichia coli; Bacteria; Microbiological culture; Pathogenic bacteria; Microbial contamination; Bacterial counters; Fluorescence microscopy; Bacteria collecting devices; Indicator species.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-1001.pdf

Analyse bacteriologique de l'eau par mesure potentiometrique de la reduction de l'acide lipoique
Provedor de dados: 5
Autores: Charriere, G; Jouenne, T; Junter, G.
A simple potentiometric technique to detect and enumerate the bio-indicators of water contamination is described. The technique consists in measuring the redox potential of a specific culture medium saturated with oxygen where bacteria are incubated in presence of lipoic acid (LA). These micro-organisms reduce LA to dihydrolipoic acid, giving rise to an important potential drop in the system. This potentiometric "signal" reveals the presence of active metabolic bacteria in the medium. The major assets of potentiometric measurements in presence of LA lies in the reliability and intelligibility of the results (the redox phenomenon being qualitatively and quantitatively studied), associated to a very simple technology. Futhermore, this technique is perfectly...
Tipo: Text
Palavras-chave: Bacteria; Pollution indicators; Water quality; Microbial contamination; Indicator species; Pollution detection; Redox potential; Titration.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-1007.pdf

Underwater video offers new insights into community structure in the Grande Vasière (Bay of Biscay)
Provedor de dados: 5
Autores: Merillet, Laurene; Robert, Marianne; Salaun, Michele; Schuck, Lucie; Mouchet, Maud; Kopp, Dorothee.
Based on towed underwater videos, diversity patterns and their main environmental and anthropogenic drivers were assessed in the “Grande Vasière” (northeast Bay of Biscay), one of the main French fishing grounds. The density of bentho-demersal megafauna was recorded along 152 transects in this area in 2014. The highest number of taxa and densities were observed on the external margin of the Grande Vasière, in deep areas with low fishing intensity. The highest levels of taxa evenness were located on the central and coastal parts that are shallower and exposed to medium to high trawling intensity. Multivariate analysis identified four different communities driven by fishing intensity, depth, sediment type and bottom current speed. We distinguished three...
Tipo: Text
Palavras-chave: Biodiversity patterns; Indicator species; Fishing and environmental variables.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00441/55261/56796.pdf

The behaviour of F specific bacteriophage in depurating shellfish with reference to their use as pollution indicator organisms
Provedor de dados: 5
Autores: Lees, D; Dore, W.
The behaviour of sex-pilli specific (F+) bacteriophage during the depuration process was investigated using Pacific oysters (Crassostrea gigas) and edible mussels (Mytilus edulis) naturally contaminated with untreated sewage. F+ bacteriophage was eliminated considerably slower than E. coli. This effect was most pronounced in oysters which showed average T90 bacteriophage values of 62.5 hours compared with 11 hours for E. coli. F+ bacteriophage in mussels was largely confined to the digestive tract. The majority of E. coli were similarly located but, in contrast, counts were also distributed throughout the other internal tissues. Investigation of ultra-violet (UV) dosage showed that the difference in depuration rate was unlikely to be due to the higher...
Tipo: Text
Palavras-chave: Escherichia coli; Mytilus edulis; Crassostrea gigas; Bivalvia; Indicator species; Marine molluscs; Bacteriophages; Pollution indicators; Marine pollution; Shellfish; Self purification.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/1992/acte-1605.pdf

BIGORNO. Biodiversité Intertidale sud Gascogne Observation et Recherche de Nouveaux Outils de surveillance et d'aide à la décision - Rapport fiinal
Provedor de dados: 5
Autores: De Casamajor, Marie-noelle; Lalanne, Yann; Huguenin, Laura; Marticorena, Julien; Lissardy, Muriel; Bru, Noelle; D'Amico, Franck; Liquet, Benoît.
This report presents the results obtained during the BIGORNO project whose main objective is to overcome knowledge gaps on the biocenoses of the southern sub-region "Bay of Biscay" to propose a sampling protocol adapted to biogeographic and environmental specific conditions. A stratified random sampling design considering spatial heterogeneity has been implemented. Biodiversity was considered on 0.1 m²quadrats. These data have revealed the organization of benthic communities and the relevant taxa to be considered (species or assemblages of indicator species) in the context of establishing perennial monitoring of intertidal habitats. Proposals are made to implement the descriptors and indicators defined in the Marine Strategy Framework Directive (MSFD).
Tipo: Text
Palavras-chave: Côte basque; Estran rocheux; Microhabitats; Espèces indicatrices; Analyses multivariées; DCSMM; Basque coast; Intertidal rocky shore; Microhabitat; Indicator species; Multivariate analysis; MFSD.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00371/48229/48893.pdf

Grow-out mariculture techniques in tropical waters: A case study of problems and solutions in Hong Kong.
Provedor de dados: 5
Autores: Wu, R; Lee, J.
Raft culture is practised and trash fish is being used as feed in Hong Kong. Culture space is limited and most of the culture sites are over-crowded. Food conversion ratio is poor (about 10-15), grow-out mortality is high (30-50%) and fish kills caused by oxygen depletions, algal blooms and red tides occur frequently. Disease and water pollution are also problems.
Tipo: Text
Palavras-chave: Sparidae; Pisces; Indicator species; Diseases; Water pollution; Cage culture; Artificial feeding; Food fish; Oxygen depletion; Mortality; Growth; Stocking density; Fish culture.
Ano: 1989
URL: http://archimer.ifremer.fr/doc/1989/acte-1427.pdf

Inadequacy of bacterial indicators for assessing elimination rates of viruses from molluscan shellfish
Provedor de dados: 5
Autores: Burkhardt, W; Watkins, W; Rippey, S.
The reported incidence of shellfish-borne illness in the United States increased dramatically during the last decade. Most of the outbreaks are attributed to diseases of viral aetiology. These human health problems result primarily from the ingestion of raw shellfish which have accumulated enteric pathogens from environmental waters or from wet storage facilities. Our studies have demonstrated that hard-shelled clams concentrate different indicator micro-organisms at variable and unpredictable rates during the year. In temperate waters, this has been observed at two abbreviated periods in mid-spring and again in late fall when accumulation rates increased dramatically. Moreover, these rates were not generally coincident for viruses and bacteria. In...
Tipo: Text
Palavras-chave: Mollusca; Intestinal microflora; Phages; Seafood; Public health; Diseases; Marine molluscs; Viruses; Shellfish; Self purification; Bacteria; Indicator species.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/1992/acte-1609.pdf

Biodiversity patterns, environmental drivers and indicator species on a High-temperature Hydrothermal edifice, mid-Atlantic ridge
Provedor de dados: 5
Autores: Sarrazin, Jozee; Legendre, Pierre; De Busserolles, Fanny; Fabri, Marie-claire; Guilini, Katja; Ivanenko, Viatcheslav N.; Morineaux, Marie; Vanreusel, Ann; Sarradin, Pierre-marie.
Knowledge on quantitative faunal distribution patterns of hydrothermal communities in slow-spreading vent fields is particularly scarce, despite the importance of these ridges in the global mid-ocean system. This study assessed the composition, abundance and diversity of 12 benthic faunal assemblages from various locations on the Eiffel Tower edifice (Lucky Strike vent field, Mid-Atlantic Ridge) and investigated the role of key environmental conditions (temperature, total dissolved iron (TdFe), sulfide (TdS), copper (TdCu) and pH) on the distribution of macro- and meiofaunal species at small spatial scales (&lt; 1 m). There were differences in macro- and meiofaunal community structure between the different sampling locations, separating the hydrothermal...
Tipo: Text
Palavras-chave: Biodiversity patterns; Environmental drivers; Indicator species; Hydrothermal vents; Mid-Atlantic Ridge; Meiofauna; Macrofauna; Lucky Strike.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00266/37713/35731.pdf

Do we protect biological originality in protected areas? A new index and an application to the Bonifacio Strait Natural Reserve
Provedor de dados: 5
Autores: Mouillot, D; Culioli, J; Pelletier, Dominique; Tomasini, J.
Changes in biodiversity may disrupt the ecological functions performed by species assemblages. Hence, we urgently need to examine the implications of biodiversity loss not only in terms of species conservation but also in terms of sustainability of ecosystem services. The ability of protected areas to maintain local species richness has been clearly demonstrated. However, preserving goods and services provided by ecosystems requires not only the conservation of species richness but also the conservation of the most 'original' species, i.e. the ones with the highest average rarity of their attributes which are likely to perform some unique functions in ecosystems. We proposed a new conservation of biological originality (CBO) index as well as associated...
Tipo: Text
Palavras-chave: Biological indicator; Indicator species; Fish assemblage; Randomization test; Functional originality; Functional trait; Marine reserve.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4480.pdf

Annelid assemblages in soft bottoms subjected to human impact in the Urias estuary (Sinaloa, Mexico)
Provedor de dados: 5
Autores: Mendez, N.
The annelid fauna inhabiting soft bottoms was analysed during February and April, 1997 in the Urfas estuary which is mostly surrounded by mangrove swamps, but is also subjected to the effect of several anthropogenic activities, Classification and ordination techniques were used to perform the characterisation of the system based on the annelid assemblages according to environmental variables (mainly organic matter content and percentage of mud). Three zones were found: (1) 'very polluted zone', in front of a slaughterhouse and a fish processing factory with a total lack of macrofauna due to the strong enrichment of the sediment in organic matters (2) 'polluted zones', characterised by the sporadic presence of oligochaetes in front of a domestic sewage...
Tipo: Text
Palavras-chave: Annélides; Fonds meubles; L'estuaire d'Urías; Écosystème perturbé; Espèces indicatrices; Annelids; Soft bottoms; Urias estuary; Ecosystem disturbances; Indicator species.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/00322/43315/42939.pdf

Phytotherapies in motion: French Guiana as a case study for cross-cultural ethnobotanical hybridization
Provedor de dados: 5
Autores: Tareau, M.-a.; Bonnefond, A.; Palisse, M.; Odonne, G.
Background French Guiana is characterized by a very multicultural population, made up of formerly settled groups (Amerindians, Maroons, Creoles) and more recent migrants (mostly from Latin America and the Caribbean). It is the ideal place to try to understand the influence of intercultural exchanges on the composition of medicinal floras and the evolution of phytotherapies under the effect of cross-culturalism. Methods A combination of qualitative and quantitative methods was used. Semi-directive interviews were conducted in 12 localities of French Guiana’s coast between January 2016 and June 2017, and the responses to all closed questions collected during the survey were computerized in an Excel spreadsheet to facilitate quantitative processing. Herbarium...
Tipo: Text
Palavras-chave: Cultural keystone species; Indicator species; Exchange networks; Migrations.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00652/76384/77395.pdf

Butterflies for the new millennium: mapping butterfly distributions in Britain (Lepidoptera)
Provedor de dados: 16
Autores: Fox, R.; Warren, M.; Harding, P.; Asher, J.; Jeffcoate, G.; Jeffcoate, S.
Butterflies for the new millennium: mapping butterfly distributions in Britain (Lepidoptera)   Butterflies for the New Millennium is the largest and most comprehensive survey of butterfly distribution ever undertaken in Britain and Ireland. The number of contributing recorders, the coverage achieved and the number and quality of distribution records generated far exceed those available for any other invertebrate taxon. The data thus provide a unique insight into the effects of habitat degradation and climate change on a high profile insect group. The results of the first five years of the survey (1995-1999) have been analysed to assess broad-scale distribution changes over the past two decades and the past two centuries. In both time periods, the British...
Tipo: Article in monograph or in proceedings
Palavras-chave: Butterfly recording; Butterfly distribution; Habitat degredation; Climate change; Biodiversity; Conservation; Indicator species; 42.75.
Ano: 2003
URL: http://www.repository.naturalis.nl/record/219857

Estudio de la morfometría de las sagittae en poblaciones de sciaenidos marinos de aguas cálidas del Perú y aguas templado-frías de Argentina
Provedor de dados: 20
Autores: Volpedo, A.
Otoliths (sagitta, asteriscus and lapillus)are complex structures composed of calcium carbonate, other minerals, and a protein matrix. Otoliths are located in the internal ear of the teleost fishes. The shape and structure of otoliths are specific for each species. For this reason, otoliths are used to identify species in biological and ecological studies.Sciaenids conform a group of fishes of commercial importance, so the handling of this resource is a high-priority topic for the local and national economies of countries that exploit these species. The purpose of this work is to study different aspects of the sagittae of marine sciaenids from Argentina and Peru. The morphology, morphometry and chemical composition has been analyzed in relation to the...
Tipo: Theses and Dissertations
Palavras-chave: Otoliths; Morphometry; Identification keys; Indicator species; Dimensions; Trace metals; Environmental factors; Stocks; Coastal fisheries; Otoliths; Dimensions; Environmental factors; Stocks; Indicator species; Coastal fisheries; Http://aims.fao.org/aos/agrovoc/c_27091; Http://aims.fao.org/aos/agrovoc/c_2283; Http://aims.fao.org/aos/agrovoc/c_2594; Http://aims.fao.org/aos/agrovoc/c_28772; Http://aims.fao.org/aos/agrovoc/c_35790; Http://aims.fao.org/aos/agrovoc/c_1696.
Ano: 2001
URL: http://hdl.handle.net/1834/3132

Distribución del primer  nivel trófico (fitoplancton) en el Pacífico ecuatoriano, período 1996-1997 (pre-El Niño)
Provedor de dados: 20
Autores: Tapia, M.E.; Torres, G.
Este artículo describe las condiciones bio-oceanográficas del primer nivel trófico, distribución y concentración de la biomasa fitoplanctónica (clorofila "a") y contajes celulares) a nivel superficial y subsuperficial de la capa fótica a los 75 m. de profundidad, se da la distribución de especies indicadoras del fitoplancton y su relación con las variables de temperatura y nutrientes, registrados en tres cruceros oceanográficos realizados en octubre/1996, abril-mayo/1997 y agosto/1997.
Tipo: Journal Contribution
Palavras-chave: Distribution; Biomass; Chlorophylls; Phytoplankton; Indicator species; El Nino phenomena; Trophic levels; Multiship expeditions; Distribution; Biomass; Phytoplankton; Trophic levels; Chlorophylls; Indicator species.
Ano: 1998
URL: http://hdl.handle.net/1834/2280

Pterópodos tecosomados y heterópodos (Gasterópodos) como bioindicadores del evento "El Niño" 1992, en la estación fija "La Libertad", Ecuador
Provedor de dados: 20
Autores: Cruz, M.
Acogiendo la recomendación del "Estudio Regional del fenómeno El Niño" (ERFEN), de la Comisión Permanente del Pacífico Sur (CPPS), de buscar nuevos organismos que puedan ser utilizados como bioindicadores tempranos de el fenómeno "EN", desde Junio/90 se viene estudiando quincenal y mensualmente a los Pterópodos tecosomados y Heterópodos en la estación fija "La Libertad", que está localizado 10 millas costa afuera en la Latitud 02°06'00" y Longitud 81°03'43''.
Tipo: Journal Contribution
Palavras-chave: Marine molluscs; Distribution records; Organism morphology; Indicator species; Marine meteorology; Indicator species; Http://aims.fao.org/aos/agrovoc/c_35790.
Ano: 1996
URL: http://hdl.handle.net/1834/2190

Determinación de la concentración de hidrocarburos en las aguas superficiales y sedimentos y su relación con Capitella capitata para conocer la contaminación del estuario del Río Chone
Provedor de dados: 20
Autores: Paredes, P.
Durante mayo a octubre del 2007 abarcando la época seca y lluviosa, se realizaron análisis para la determinación de hidrocarburos aromáticos totales existentes en agua y sedimentos dentro del estuario del Río Chone mediante la técnica de CARIPOL; los análisis fueron realizados en el Instituto Oceanográfico de la Armada. Dentro del estuario se tomaron 4 estaciones cada una de ellas con un punto de referencia: Estación 1:Isla Corazón, Estación 2: Mangle 2000, Estación 3: Capitanía de Puerto, Estación 4: Repsol. Las muestras fueron tomadas una vez al mes; tomando en cuenta la radiación solar y mareas como variables para el estudio. La concentración de hidrocarburos aromáticos totales disueltos y dispersos en el agua fue entre 0.05-0.329 ug/L, el valor más...
Tipo: Journal Contribution
Palavras-chave: Aromatic hydrocarbons; Sediments; Chemical analysis; Indicator species; Pollution legislation.
Ano: 2010
URL: http://hdl.handle.net/1834/4217

Distribución del fitoplancton y su comportamiento en el afloramiento en las Islas Galápagos
Provedor de dados: 20
Autores: Torres, G.; Tapia, M.E.
Los objetivos de este crucero han sido colectar información que permitirá comprender mejor la dinámica poblacional (cuali-cuantitativo) de las diferentes masas de aguas que afloran al este y al oeste de las Islas Galápagos y su interacción entre las islas, estos resultados permitirán dar una mejor apreciación sobre áreas de mayor fertilidad marina ( clorofila "a", contajes celulares), organismos indicadores del afloramiento y su posible asociación con áreas de riqueza ictiológica.
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Chlorophylls; Biological production; Indicator species; Ichthyoplankton; Cruises; Population dynamics; Phytoplankton; Biological production; Chlorophylls; Indicator species; Population dynamics; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_36649; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_35790; Http://aims.fao.org/aos/agrovoc/c_6111.
Ano: 2000
URL: http://hdl.handle.net/1834/2240

Notas hidrológicas de aguas superficiales ecuatorianas según indicadores biológicos-foraminíferos planctónicos
Provedor de dados: 20
Autores: Luzuriaga de Cruz, M.
El presente trabajo trata sobre la distribución de los foraminíferos planctónicos vivos en aguas superficiales del mar ecuatoriano, durante los periodos normales y anómalos del océano, ocurridos en determinadas épocas de los años 1971 a 1973 y 1974. El área de muestreo de mayor extensión comprende desde la costa hasta Long. 86°W entre Lat. 01°22'N y Lat. 03°16'S. La distribución de los foraminíferos planctónicos evidencia el desplazamiento de masas de aguas procedentes de la Cuenca de Panamá, Corriente del Perú y zonas de convergencia. Las especies indicadoras de aguas cálidas fueron: Globigerinoides ruber, Bloborotalia mebnardii, Globigerinoides sacculifer y de aguas frías: Globigerina quinqueloba, Globigerinita bradyi, Globigerina bulloides. Durante la...
Tipo: Journal Contribution
Palavras-chave: Foraminifera; Plankton; Indicator species; Vertical distribution; Horizontal distribution; Coastal waters; Environmental conditions; Plankton; Indicator species; Coastal waters; Environmental conditions; Http://aims.fao.org/aos/agrovoc/c_5950; Http://aims.fao.org/aos/agrovoc/c_35790; Http://aims.fao.org/aos/agrovoc/c_25205; Http://aims.fao.org/aos/agrovoc/c_32980.
Ano: 1992
URL: http://hdl.handle.net/1834/2313

Evaluación de la tasa fotosintética del alga verde Rhizoclonium riparium (Roth) Kützing ex Harvey, expuesta a cobre y su uso como indicador de contaminación por metales en aguas estuarinas
Provedor de dados: 20
Autores: Montoya, W.; Peña, E.J.; Benítez, R.
Algae have been used as bioindicators by having several advantages such as they have short life cycles, they can take up nutrients directly from water, they are generally easy to collect in sufficient amounts from various habitats; and they readily accumulate compounds present in seawater, making tissue analyses reliable indicators of water quality. In order to evaluate the bioremoval capability of the green alga Rhizoclonium riparium, the photosynthetic responses to heavy metal pollution under different sublethal concentrations of copper was assessed. Photosynthetic rates were significantly low (p &lt;0.05) at low copper concentrations, between (0.01 y 10 mg/l). Maximum photosynthetic values were shown at 30 y 60 mg/l and almost cero at 150 mg/ l of Cu....
Tipo: Conference Material
Palavras-chave: Heavy metals; Biological stress; Algae; Indicator species; Pollution; Bioaccumulation; Copper; Water quality; Estuaries; Heavy metals; Pollution; Bioaccumulation; Copper; Water quality; Estuaries; Algae; Indicator species; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_6077; Http://aims.fao.org/aos/agrovoc/c_32389; Http://aims.fao.org/aos/agrovoc/c_1868; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_258; Http://aims.fao.org/aos/agrovoc/c_35790.
Ano: 2006
URL: http://hdl.handle.net/1834/2256

Especies planctónicas marinas como bioindicadoras de masas de agua frente a la costa ecuatoriana durante el evento El Niño 2009-2010
Provedor de dados: 20
Autores: Cruz, M.; Tapia, M.E.; Naranjo, Ch.
Con la finalidad de determinar la influencia del evento El Niño 2009-2010 que se dsarrolló en elas regiones Niño 1+2 y 3.4, en base a los organismos indicadores de masas de aguas para determinar la intensidad y efectos en la costa ecuatoriana, se utilizaron cinco grupos de organismos planctónicos: Diatomeas, Dinoflagelados, Quetognatos, Pterópodos, Heterópodos y las concentraciones de clorofila a antes, durante y después del evento El Niño 2009-2010. En el primer trimestre del 2009 se registró una alta producción primaria, mientras que desde septiembre a noviembre se observó la más baja productividad del mar, en las estaciones fijas La Libertad como en Manta.En la estación fija de La Libertad, durante todo el 2009 predominaron especies de fitoplancton que...
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Zooplankton; Indicator species; Diatoms; Primary production; El Nino phenomena; Water masses.
Ano: 2010
URL: http://hdl.handle.net/1834/4213

Gasterópodos planctónicos (Pterópodos y Heterópodos) como bioindicadores de los eventos "El Niño" 1992 y 1997 - 1998 en la estación fija "La Libertad", Ecuador
Provedor de dados: 20
Autores: Cruz, M.
Con este aporte al mejor conocimiento de los Pterópodos y Heterópodos, el INOCAR cumple con una recomendación de la Comisión Permanente del Pacífico Sur (CPPS) de estudiar los organismos bioindicadores con la finalidad de encontrar en un futuro, especies que se puedan utilizar como Biondicadores tempranos del Evento "El Niño".
Tipo: Journal Contribution
Palavras-chave: Marine molluscs; Indicator species; Geographical distribution; El Nino phenomena; Fixed stations; Geographical distribution; Indicator species.
Ano: 1998
URL: http://hdl.handle.net/1834/2279

Nematodes parásitos como indicadores biológicos de Macruronus magellanicus
Provedor de dados: 20
Autores: Incorvaia, I.S.; Hernandez, D.R.
A wide distributional range species can constitute many populations or fishing stocks which can be whole or partly overlapped within their distribution area, reason why they must be clearly identified. Therefore, proper identification of stocks is necessary for fisheries management, as this is the unit to which the fishing effort should be applied. The parasitological method is one of the systems currently used to determine stock. Nematodes parasites of Macruronus magellanicus (longtail hake) collected during surveys enmarked between 45º S-55º S in the Southwest Atlantic were studied. Nematodes that could be used as biological indicators were selected. Mean abundance values of L3 Anisakis simplex and Hysterothylacium aduncum were estimated. Three different...
Tipo: Journal Contribution
Palavras-chave: Indicator species; Abundance; Endoparasites; Endoparasites; Indicator species; Http://aims.fao.org/aos/agrovoc/c_10603; Http://aims.fao.org/aos/agrovoc/c_35790.
Ano: 2006
URL: http://hdl.handle.net/1834/1565

Evaluación del impacto ambiental sobre las comunidades de protozoos en la desembocadura del Rio Almendares, Ciudad de la Habana, Cuba.
Provedor de dados: 20
Autores: Revilla Alcázar, I.; Prieto Trueba, D.
One of the practical utilities of the protozoa resides in their employment as biological indicators of the degree of environmental contamination. In this work a characterization of the protozoa community is made in the outlet of the river Almendares, which constitutes the most important fluvial current in the Cuban archipelago from the historical point of view, for they were selected it five stations that they were randomized monthly for a two year-old period (1996-1998). Of the 100 identified species 34 constitute new registrations for this segment of the river. The biggest specific richness corresponded to the ciliates, representing 67% of the total of species. The smallest specific richness corresponded to the estuary, where species are included...
Tipo: Conference Material
Palavras-chave: Indicator species; Freshwater pollution; Population density; Estuaries; Estuaries; Indicator species; Population density; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_35790; Http://aims.fao.org/aos/agrovoc/c_6112.
Ano: 2006
URL: http://hdl.handle.net/1834/2253

Contribución al estudio de los quetognatos alrededor de las Islas Galápagos
Provedor de dados: 20
Autores: Naranjo, Ch.
El presente estudio tiene como labor fundamental conocer la distribución cuantitativa de las especies de quetognatos y su relación con factores como la temperatura, salinidad y establecer áreas de alta productividad en las Islas Galápagos con la presencia de especies bio-indicadoras de afloramiento.
Tipo: Journal Contribution
Palavras-chave: Indicator species; Upwelling; Zooplankton; Marine invertebrates; Population density; Environmental factors; Zooplankton; Environmental factors; Indicator species; Population density; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_2594; Http://aims.fao.org/aos/agrovoc/c_35790; Http://aims.fao.org/aos/agrovoc/c_6112.
Ano: 2000
URL: http://hdl.handle.net/1834/2223

Nematodes parásitos como indicadores biológicos en las especies Macruronus magellanicus y Merluccius hubbsi (Pisces, Gadiformes)
Provedor de dados: 20
Autores: Incorvaia, I.S.
Parasites nematodes as biological tags of Macruronus magellanicus (longtail hake) and Merluccius hubbsi (hake) colleted between 34°- 55°S in the SW Atlantic were studied. Adult specimens of Hysterothylacium aduncum, Ascarophis marina and Ichthytofilaria argentinensis, and the third-stage specimens of H. aduncum, Anisakis simplex and Contracaecum aduncum were described. Histological studies showed that I. argentinensis provokes tissue reactions in the swim bladder of  M. hubbsi.  A wide distributional range of species can be represented by many fish populations or fishing stocks. As these can overlap in space, the proper identification of stocks is necessary for fisheries management. The parasitologic method is one currently used to determine stocks....
Tipo: Theses and Dissertations
Palavras-chave: Stock identification; Parasites; Indicator species; Abundance; Histology; Marine fish.
Ano: 2002
URL: http://hdl.handle.net/1834/5030

Etude de la résistance aux antibiotiques des bactéries isolées de "mytilus galloprovincialis.
Provedor de dados: 20
Autores: El Bour, M.; Bouamama, K.; El Abed, O.
L’étude des résistances vis-à-vis de différentes substances antibiotiques pour des espèces bactériennes (aérobies et anaérobies) isolées chez Mytilus galloprovincialis a été réalisée par la méthode standard de l’antibiogramme. Ainsi, 50 souches bactériennes aérobies et 20 souches anaérobies appartenant à plus de 25 espèces différentes ont été isolées et testées. Les résultats obtenus montrent des profils à plusieurs résistances vis-à-vis des différentes familles  d’antibiotiques testés. Les résultats obtenus révèlent des profils à 12 résistances différentes notamment chez l’espèce anaérobie (Propioni acnes). Aussi, chez l’espèce aérobie pré dominante ( Aeromonas hydrophila) nous avons mis en évidence au moins 6 antibiotypes différents. Ces résultats...
Tipo: Journal Contribution
Palavras-chave: Antibiotics; Bacterial diseases; Control resistance; Ecology; Eutrophication; Indicator species; Microbiological analysis; Bacteria; Mytilus galloprovincialis; Http://aims.fao.org/aos/agrovoc/c_765; Http://aims.fao.org/aos/agrovoc/c_31155.
Ano: 2006
URL: http://hdl.handle.net/1834/4266

Morphotypes, structure trophique et état de maturité de la nématofaune de la lagune de Bizerte
Provedor de dados: 20
Autores: Mahmoudi, E.; Beyrem, H.; Boufahja, F.; Essid, N.; Hedfi, A.; Aissa, P.
Dix stations côtières ont été prospectées dans la lagune de Bizerte en hiver 2001 pour étudier l’impact des conditions environnementales sur les plans morphométrique, trophique et de maturité des nématodes méiobenthiques. Nos résultats montrent que la croissance en largeur des nématodes libres a été proportionnelle aux charges sédimentaires en fraction fine et en métaux et ce parallèlement à l’individualisation de quatre morphotypes nématologiques. D’autre part, la structure trophique de la nématofaune est liée à la turbidité et aux concentrations des eaux en nitrites. En effet, la proportion en détritivores sélectifs, principalement bactériophages, au sein des communautés nématologiques, est positivement corrélée à la concentration des eaux en nitrites et...
Tipo: Journal Contribution
Palavras-chave: Environmental effects; Feed composition; Indicator species; Pollution monitoring; Sedimentation; Sexual maturity; Turbidity; Nematoda; Environmental impact; Http://aims.fao.org/aos/agrovoc/c_5112; Http://aims.fao.org/aos/agrovoc/c_24420.
Ano: 2006
URL: http://hdl.handle.net/1834/4156

Composición, distribución y abundancia relativa de copépodos pelágicos calanoideos y no calanoideos en aguas ecuatorianas durante el evento La Niña en septiembre de 2001
Provedor de dados: 20
Autores: Tutasi, P.
El presente trabajo es una contribución para el conocimiento de la oceanografía biológica de la región ecuatorial tropical donde se manifiestan estas importantes perturbaciones climáticas.
Tipo: Journal Contribution
Palavras-chave: Community composition; Marine crustaceans; Abundance; Plankton; Zooplankton; Marine ecology; Indicator species; El Nino phenomena; Geographical distribution; Plankton; Zooplankton; Geographical distribution; Marine ecology; Indicator species.
Ano: 2006
URL: http://hdl.handle.net/1834/2329

Significations ecologiques de la variabilite des polychetes dans le golfe de Tunis
Provedor de dados: 20
Autores: Zaabi, S.; Afli, A.
The coastal areas, like the gulf of Tunis, are more and more affected by the increasing anthropic activities and nutriment inputs coming from the catchments area. The polychaeta populations show different reactions in front of such conditions and constitute an effective biological tool to detect the first signs of disturbance. In total, nine stations in the north-east of the gulf, were sampled by the Van Veen grab. In this study, the model of ecological groups and biotic index was used. It appears that the general state in the studied area is overall satisfactory, except for some ones where a situation of beginning of imbalance or of transition, seems taking place.
Tipo: Journal Contribution
Palavras-chave: Polychaeta; Ecological zonation; Ecosystem disturbance; Eutrophication; Indicator species; Pollution monitoring; Water quality; Ecological zonation; Eutrophication; Water quality; Indicator species; Http://aims.fao.org/aos/agrovoc/c_2465; Http://aims.fao.org/aos/agrovoc/c_2734; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_35790.
Ano: 2006
URL: http://hdl.handle.net/1834/4273

Determinación de los períodos cálidos (El Niño) y fríos (La Niña), en base al comportamiento mensual de los Pterópodos y Heterópodos, como bioindicadores del ecosistema marino ecuatoriano
Provedor de dados: 20
Autores: Cruz, M.
El propósito de esta contribución es aportar al mejor conocimiento en la determinación de los períodos cálidos y fríos observados frente a la costa de Ecuador, con la finalidad de aportar al mejor conocimiento de estos eventos oceanográficos naturales, con los que tenemos que aprender a vivir y a tratar de encontrar especies que puedan indicarnos un pronóstico temprano a El Niño o La Niña.
Tipo: Journal Contribution
Palavras-chave: El Nino phenomena; Indicator species; Marine molluscs; Fixed stations; Surface temperature; Indicator species.
Ano: 2006
URL: http://hdl.handle.net/1834/3800

Distribución del fitoplancton en la región costera del mar ecuatoriano, durante diciembre 2000
Provedor de dados: 20
Autores: Torres, G.; Tapia, M.E.
La presente investigación describe el comportamiento del primer nivel trófico (clorofila, feopigmentos, biomasa celular e indicadores del fitoplancton) en el ecosistema costero del mar ecuatoriano, conocer la incidencia de las principales especies que se encuentran formando núcleos de mayor productividad e inter-relacionadas con las condiciones ambientales durante el Crucero realizado en diciembre/2000.
Tipo: Journal Contribution
Palavras-chave: Distribution; Phytoplankton; Chlorophylls; Biomass; Indicator species; Cruises; Distribution; Phytoplankton; Biomass; Chlorophylls; Indicator species; Http://aims.fao.org/aos/agrovoc/c_35773; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_35790.
Ano: 2002
URL: http://hdl.handle.net/1834/2260

Los eufáusidos en el mar ecuatoriano como indicadores de masas de agua, durante el crucero oceanográfico CO-II-99. Septiembre-octubre de 1999
Provedor de dados: 20
Autores: Castañeda, P.
Se analiza la distribución, abundancia relativa y composición de especies del orden Euphausiacea en el mar ecuatoriano, en el período septiembre-octubre de 1999 (CO-II-99). De un total de 25047 org/1000m³ se identificaron las siguientes especies Nyctiphanes simplex; Euphausia distinguenda; E. diomedeae; E. tenera; Stylocheiron sp., S. carinatum; S. longicorne; Nematoscelis sp., N. gracilis; N. tenella; Nematobrachion flexipes y Thysanopoda orientalis. La información biológica obtenida se correlaciona con las condiciones físicas del océano observadas durante el período de estudio. Se destaca la abundancia de Nyctiphanes simplex, en el área de influencia de la Corriente de Humboldt. La distribución de las especies propias de aguas tropicales y subtropicales...
Tipo: Journal Contribution
Palavras-chave: Indicator species; Water masses; Distribution; Abundance; Composition; Cruises; Marine crustaceans; New records; Distribution; Indicator species; Http://aims.fao.org/aos/agrovoc/c_35773; Http://aims.fao.org/aos/agrovoc/c_35790.
Ano: 2000
URL: http://hdl.handle.net/1834/2275

Composition and structure of aquatic insect assemblages of Yungas mountain cloud forest streams in NW Argentina
Provedor de dados: 99
Autores: Von Ellenrieder,Natalia.
Thirty three lotic environments in the Yungas mountain cloud forest of NW Argentina were sampled both in undisturbed forest areas and sites altered by human activities. Aquatic insects of 143 taxa in 55 families were collected. Cluster analysis suggested altitude as one of the main structuring variables of aquatic insect communities in these streams, and its importance was confirmed by non-metric multidimensional scaling (NMS); the environmental parameters measured that were best correlated with the ordination were altitude, water temperature, latitude and channel variables (width, percentage of large and small woody debris, of undercut banks, cobble and coarse gravel). Multi response permutation procedures (MRPP) showed streams in well preserved areas to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diversity; Community structure; Indicator species; Biological metrics; Elmidae.
Ano: 2007
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0373-56802007000200008

Does riparian vegetation affect fish assemblage? A longitudinal gradient analysis in three Amazonian streams
Provedor de dados: 3
Autores: Virgilio, Lucena Rocha; Ramalho, Werther Pereira; Silva, João Carlos Barbosa da Silva; Suçuarana, Monik da Silveira; Brito, Cleyton Holanda de; Vieira, Lisandro Juno Soares.
 The degradation of riparian vegetation in low-order streams can cause irreversible environmental damage, biodiversity loss and alter the structure of communities. In this context, the present study evaluated how the level of degradation of riparian vegetation influences the fish assemblage in three low-order streams in the Brazilian Amazon. In each stream, three different stretches were delimited, distributed in the environments of forest, edge and pasture, and the samplings were conducted in three hydrological regimes using dip nets. Influences of the stretches and streams on richness and abundance were tested with GLMM, on the composition with PERMANOVA and on indicator species with IndVal. Species richness was higher in forest environments and lower in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Low-order streams; Environmental alteration; Diversity loss; Fish diversity; Indicator species; Pasture.
Ano: 2018
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/42562