Nora Gómez

Nora Gómez
Instituto de Limnología "Dr. Raúl A. Ringuelet" | ILPLA · Plancton -biofilms

About

87
Publications
25,510
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2,226
Citations
Citations since 2016
23 Research Items
1210 Citations
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200

Publications

Publications (87)
Article
Full-text available
The appearance of modern technological tools facilitates the characterization, monitoring, and modelling of wetlands related to groundwater. These techniques include the use of unmanned aircraft systems (drones) and continuous measurement sensors for water levels and quality. The traditional procedures associated with these new technologies provide...
Article
Full-text available
Stream biofilms are among the first to react to environmental degradation, since their structural and functional characteristics are tightly linked to the physicochemical variables in the water and sediment. The objectives of this research were to study the differences in chlorophyll-a, bacterial density and metabolism endpoints of epipelic biofilm...
Article
Riparian areas of riverine plains develop extensive floodable areas named riverine wetlands, which are essential to the water cycle balance and ecosystem dynamics. In this study, we contrasted the hydrological and physicochemical variables of riverine wetlands of both peri-urban areas impacted by intensive farming and those of rural areas with the...
Article
The objective was to establish possible temporal patterns in the microplastics (MPs) abundance in the water and in the intertidal sediment in an urbanized location of the Río de la Plata estuary (Argentina), in relation to environmental factors. The site was sampled monthly for a year (February 2019–January 2020). The presence of MPs was recorded,...
Article
Ecological aquaculture promotes the development of sustainable farming systems, focusing on a wide range of ecosystem elements. The ecological aquaculture of the zooplanktivorous pejerrey (Odontesthes bonariensis) in floating cages in Pampean shallow lakes (Argentina) needs to be carried out considering the hydrological and chemical variations as m...
Article
Diatoms respond to toxicants in lotic systems, and they are commonly considered to be sensitive indicators in environmental safety assessment. In addition to the structural characteristics of the algal populations, recent studies have shown that endpoints such as nuclear anomalies or diatom motility measures can be affected quickly by environmental...
Article
The colonisation patterns of diatom assemblages were studied on artificial substrates in lowland streams with different urban pollution levels. Density, diversity, colonisation rates, ecological guilds and cell size classes of the assemblage at each of two sites were followed for 1 week. In addition, assemblages growing on glass, in natural epipeli...
Conference Paper
Full-text available
En los sistemas fluviales de llanura pampeana es posible reconocer zonas que adquieren transitoriamente características lénticas, reconocidos como bañados de desborde fluvial. Se trata de ambientes permanentes o semipermanentes, de contorno o perímetro indefinido y con vegetación emergente abundante. Este tipo de humedal ofrece múltiples beneficios...
Poster
Full-text available
El objetivo de este estudio fue analizar las respuestas estructurales y metabólicas en biofilms epipélicos causadas por su transferencia de tramos de arroyos urbanos con bajo impacto antrópico hacia tramos más impactados. Los biofilms son sensibles a los cambios en la calidad del agua, generalmente incrementando su actividad y desarrollo en ambient...
Article
This study explores in plankton samples the abundance, distribution, size, types (fibres and fragments), colours of the microplastics (MPs) and its relation with the characteristics of the plankton (size and morphology) of the Río de la Plata estuary. Water samples were collected in triplicate in freshwater-mixohaline tidal zone of the estuary, in...
Article
The aim of this study was to describe the colonization of the biofilm during its early stages under different concentrations of nutrients and organic matter, specifically in urban streams influenced by agriculture and urbanization. We hypothesized that in a stream with higher concentrations of nutrients and organic matter, the initial biomass growt...
Article
Full-text available
We examined the responses of the phytoplankton and the bacterioplankton of the freshwater zone of the Río de la Plata estuary when exposed to an addition of hexavalent chromium (Cr⁺⁶). The planktonic community from a coastal site was exposed to a chromium increase of 80 μg L⁻¹ for 72 h in laboratory conditions. The results showed a decrease in the...
Poster
Full-text available
Los bañados de desborde fluvial contribuyen con los servicios ecosistémicos que prestan los cursos de agua; estudiar sus características constituye un aporte a la optimización de su manejo y conservación. El presente trabajo es parte de un proyecto de investigación que explora la calidad del agua, del hábitat y de la biota de bañados de desborde fl...
Conference Paper
El pejerrey (Odontesthes bonariensis) es un pez zooplanctívoro de gran relevancia ecológica y económica, especialmente para la ecoregión Pampeana. En su cultivo extensivo en jaulas flotantes en lagunas pampeanas se ha identificado la disponibilidad de zooplancton como una variable clave. Con el objetivo de obtener información que permita desarrolla...
Article
The presence of microplastics (MPs) in gut contents of coastal freshwater fish of the Rio de la Plata estuary was studied. Samples were taken in six sites where 87 fish belonging to 11 species and four feeding habits were captured. Presence of MPs was verified in the 100% of fish. The fibres represented the 96% of MPs found. The number of MPs in gu...
Article
Macrophytes were transplanted into a lowland stream affected by river engineering works. The aim was to analyse the feasibility of their reintroduction and potential to be used for the recovery of the structure and complexity of the lotic habitat. Macrophytes contribute heterogeneity to streams, modify the current velocity, affect sediment and nutr...
Article
The objective of the present article is to propose an index that allows the assessment of the fluvial habitat quality in lowland streams that run through urbanized areas, by the use of metrics related to the quality of the watercourse, the river banks, the riparian zone and the fluvial geomorphology. The metrics retained in the index (USHI, Urban S...
Article
Chronic and pulse increments of salinity can cause different consequences on the aquatic communities, and its effects are related to factors such as the magnitude, frequency and ionic composition, as well as on the baseline salt concentrations in the water. The aim of this study was to explore the responses of the biofilms from a nutrient-rich stre...
Conference Paper
Dentro de los metales pesados que contaminan los estuarios se encuentra el cromo, cuyo origen proviene principalmente de la actividad industrial. El objetivo del presente trabajo fue evaluar el efecto del cromo hexavalente sobre la densidad celular, las concentraciones de clorofila a y feofitina, la producción potencial de oxígeno del fitoplancton...
Article
Among the estuarine ecosystems under anthropogenic stress, the Río de la Plata represents a case study to identify phytoplanktonic species capable of diagnosing and warning about water quality changes. This water source is used for several purposes, including recreational and navigational activities and the provision of drinking water. We analyzed...
Chapter
Full-text available
Since bioolms integrate the environmental eeects of water chemistry, along with the physical and geomorphological characteristics of rivers and lakes, they have been widely applied in biomoni-toring. In particular, diatoms are extensively used as reliable environmental indicators. Diatoms are microscopic, unicellular brown algae, which ooen dominat...
Article
The aim of this study was to explore the responses of the epipelic biofilm of a Pampean stream with little impact from human activity to two environmental conditions, with joint modifications in nutrients, temperature, water velocity and turbidity. The experiment was conducted using artificial channels and lasted five weeks. The biological variable...
Article
Full-text available
We analyzed the diatom assemblages inhabiting the epipelic biofilm of a Pampean stream, characterized by their high basal nutrient levels, when exposed to a continuous surplus of inorganic nutrients. An in situ experience was conducted, increasing concentrations of N and P in water 3-fold from the basal concentration. Nutrient enrichment was achiev...
Article
The aim of this study was to analyze the density, diversity, biomass and assemblage composition of the phytoplankton in relation to environmental conditions (physical, chemical, hydrological and meteorological variables), measured under the different scenarios caused by the ENSO phenomenon in the period between 2005 and 2012, in six sampling sites...
Article
Full-text available
The aim of this study was to analyze the temporal distribution of phytoplanktonic cyanobacteria in a site located in the freshwater tidal zone near the extraction point for the drinking water supply. Samples were taken considering three timescales as follows: hours, days, and weeks, during the period of highest development of cyanobacteria. The phy...
Article
Full-text available
The theory of ecological stoichiometry holds that heterotrophs are mostly homeostatic and exhibit less variation in body stoichiometry than do autotrophs. Most studies of stream foodweb stoichiometry have been done in low-nutrient environments. Little is known about foodweb stoichiometry in nutrient-rich streams, in which a higher level of stoichio...
Article
Full-text available
The Río de la Plata is an extensive, shallow, and microtidal coastal-plain estuary on the east coast of South America. The river receives freshwater from South America's second largest watershed. The main tributaries are the Paraná and Uruguay rivers, characterized by flows with opposing patterns of seasonal variability. The dynamics of the Río de...
Article
Full-text available
El objetivo del presente estudio fue analizar las respuestas estructurales (densidad de organismos, biomasa total, biomasa autotrófica e índice autotrófico) y funcionales (producción primaria neta, respiración, producción primaria bruta y tasa de asimilación) del biofilm epipélico en tres sitios de un arroyo pampeano que presentan diferentes propor...
Article
Full-text available
The purpose of the present study was to analyze the structural (organisms density, total biomass, autotrophic biomass and autotrophic index) and functional (net primary production, respiration, gross primary production and assimilation rate) responses of the epipelic bioflm at three sites of a Pampean stream presenting different proportions of land...
Article
Full-text available
In streams and rivers, the first organisms which directly receive and respond to nutrients are primary producers (algae, macrophytes) and microbial heterotrophs (bacteria, fungi) since they rely on available inorganic nutrients from the water column. The aim of the present study was to analyze the response of the epipelic microbial biofilm in a Pam...
Article
Full-text available
La valoración ambiental de las riberas es una tarea necesaria para conocer el estado ecológico de los cursos de agua, lo cual permite evaluar los méritos de eventuales experiencias de manejo, impactos antropogénicos o bien detectar problemas ambientales de forma temprana. En tal sentido, el objetivo de este estudio fue desarrollar una metodología p...
Article
Full-text available
Evaluating the coastal environment is a necessary task to assess the ecological status of water bodies, which allows to determine the merits of management programs, anthropogenic impacts, or to detect early signs of environmental impacts. To this purpose, the objective of this research was to develop a methodology to assess the habitat quality in t...
Article
Diatoms are an integral and often dominant component of the benthic microalgal assemblage in estuarine and shallow coastal environments. Different toxic substances discharged into these ecosystems persist in the water, sediments, and biota for long periods. Among these pernicious agents, the toxicity in diatoms by metal is linked to different steps...
Article
Full-text available
We assessed the effects of nutrient enrichment on three stream ecosystems running through distinct biomes (Mediterranean, Pampean and Andean). We increased the concentrations of N and P in the stream water 1.6–4-fold following a before–after control–impact paired series (BACIPS) design in each stream, and evaluated changes in the biomass of bacteri...
Article
Full-text available
Our objective was to assess the effect of the physical habitat degradation in three lowland streams of Argentina that are subject to different land uses. To address this matter, we looked into some physical habitat alterations, mainly the water quality and channel changes, the impact on macrophytes' community, and the structural and functional desc...
Conference Paper
Full-text available
El objetivo de este trabajo fue estimar las preferencias ecológicas de las especies fitoplanctónicas presentes en la Franja Costera Surdel Río de la Plata, para establecer su valor diagnóstico en el monitoreo de la calidad delagua. Para esta finalidad se analizaron 224 muestras colectadas entre la línea de costa y los 3000 m de distancia de la mism...
Conference Paper
Full-text available
El objetivo del presente estudio fue analizar los cambios metabólicos del plancton y las características estructurales y ecofuncionales del componente autotrófico cuando es expuesto a distintas calidades del agua en el sector de agua dulce de la Franja Costera Sur del Río de la Plata. Para ello se seleccionaron4 sitios (Bernal, Berazategui, Punta L...
Conference Paper
Full-text available
El objetivo del desarrollo del software KARKU es facilitar la obtención, el tratamiento y la interpretación de la información generada por los índices bióticos, facilitando así establecer la calidad ecológica de los distintos ecosistemas acuáticos de la Argentina. Estas herramientas de monitoreo exploran la respuesta de las comunidades a los cambio...
Article
Full-text available
The aim of this study was to propose an index [Index of Biotic Integrity for the Río de la Plata (IBIRP)] formulated from a minimum of information-rich metrics related to biological integrity for evaluation of the coastal freshwater tidal zone of the Río de la Plata estuary. A total of 23 sites were selected along 170 km of shoreline (34°27′10″ S,...
Conference Paper
Full-text available
Las Cianobacterias de la Franja Costera Sur del Río de la Plata: distribución, vulnerabilidad costera y herramientas de monitoreo
Article
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This bioassay was designed with the aim of exploring the responses of two wild planktonic microalgae exposed in situ (72 h) as indicators of the changes in water quality. Monocultures of both strains within dialysis membrane bags were placed at two sites in a small lowland stream. Site 1 is located at a suburban area with low horticultural activity...
Article
Full-text available
The epipelic biofilm is a biologic complex of autotrophs (algae) and heterotrophs(fungi, bacteria, microinvertebrates) embedded in a polysaccharide matrix that developson the fine sediments (silt and clay) of many aquatic ecosystem worldwide of lowlandfluvial streambeds. Biofilms play a key role in the energetic balance of the fluvialsystems, contr...
Article
Full-text available
The rivers and streams in the pampean plains are characterized by a low flow rate due to the low slope of the surrounding terrain, high levels of suspended solids, silty sediment in the benthos, and reduced rithron; the riparian forest of this region has been replaced by low-altitude grasslands. Many of these environments contain a wide coverage of...
Article
Full-text available
The purpose of this study was to explore the autecology of diatom species inhabiting the epipsammon and epiphyton in the freshwater-mixohaline zone of the Rio de la Plata estuary. The diatoms are a conspicuous component of those communities. We discuss the optima and tolerance ranges of diatoms for the following environmental variables: conductivit...
Article
A translocation experiment of epipelic biofilm was performed in order to explore the effects on this biological complex when exposed to different water qualities. To carry out such an experiment we employed artificial substrata placed at two sites within a stream that receives a textile effluent: at site 1, located upstream from this influx, and at...
Article
Full-text available
Eighty nine taxa of Euglenophyta, sampled in Rodríguez Stream, Buenos Aires, Argentina, 2 belonging to the genus Euglena Ehr., 7 to Lepocinclis Perty, 14 to Phacus Duj., 40 to Strombomonas Defl. and 26 to Trachelomonas Ehr. have been identified. Besides 12 loricate taxa were examined by scanning electron microscopy (SEM). Details of their envelope...
Article
The relationship between microbenthic communities, the habitat characteristics, and physical and chemical gradients was studied in the Rio de la Plata estuary. Five replicates of the surface layer were collected seasonally, in 10 sampling sites influenced by different land uses. The distribution of microbenthic communities was governed by two gradi...
Article
The objective of this study was to assess the effects of dredging on the structure and composition of diatom assemblages from a lowland stream and to investigate whether the response of diatom assemblages to the dredging is also influenced by different water quality. Three sampling sites were established in Rodríguez Stream (Argentina); physico-che...
Article
Full-text available
We explored the effects of a textile industry effluent on water quality, habitat quality and structural and functional responses of benthic communities in a lowland stream. Two sampling sites were selected: site 1 was located 300 m upstream of the outflow from the textile factory and site 2 was 500 m downstream from the discharge point. Samples of...
Article
Full-text available
Community composition, structure, biomass and tolerance to pollution of biofilms growing on Schoenoplectus californicus were assessed, together with physico-chemical parameters of the water, to evaluate their usefulness as water quality indicators along the Argentinian shore of the freshwater zone of the Río de la Plata Estuary. Monthly sampling wa...
Article
Full-text available
The structural features and O2 consumption of the epipelic biofilm in streams of the Pampean plain were explored. The study was conducted in three lowland streams subjected to different anthropic disturbances. Three sampling sites were selected in different sectors of these streams considering land use intensity (high, moderate, and low). Samples o...
Article
The Río de la Plata is located on the East coast of South America and is a shallow, large-scale, turbid coastal plain estuary that covers an approximate area of 35,000 km2. Despite the socio-economic importance of the Río de la Plata, studies related to the biological aspects of this ecosystem are scarce, particularly in the freshwater tidal zone....
Article
The distributions of phytoplankton taxa and biomass were recorded to assess their association to environmental variables in the Río de la Plata, a shallow and highly turbid estuary. Forty-seven CTD stations covering the whole estuary were sampled from 5 to 16 November 2001. At 31 stations, dissolved oxygen concentration, pH, and light intensity at...
Article
Phytoplankton community composition, structure and biomass, spatial distribution patterns in relation to abiotic factors and life-form strategies were assessed in spring 2001 in the Rı́o de la Plata estuary. A total of 224 taxa were identified, with a mean total density of 110 cells ml−1. Although cell numbers were of the same order of magnitude in...
Article
Microalgae communities have been used for monitoring continental freshwaters in South America, mainly in Argentina and Brazil. Considering that the epipelic diatom community dominates the sediments of running waters from the Argentinean Pampean plain, and index named Diatom Pampean Index (DPI) was formulated, aiming to assess organic pollution and...
Article
Full-text available
The diatom community growing on cobbles and sand substrata along the Cuarto River (Crdoba, Argentina) was studied during 2000 and 2001. Multivariate analyses of the data (PCA and CCA) showed distinct differences in water chemistry and substrata types between the upstream sites (sites 1–10) and downstream sites (sites 11–19). Sites 1–10 supported an...
Article
Full-text available
A study of samples collected in the Don Carlos Stream, a small stream that runs across an urbanised and industrialised area of the Pampean plain, displayed abnormalities in the valves of Pinnularia gibba Ehrenberg. Three stations were sampled in different sectors of the stream: station A was located upstream and exposed to agricultural activity, st...
Article
Full-text available
The epipelic biofilm is a biologic complex of autotrophs (algae) and heterotrophs (fungi, bacteria, microinvertebrates) embedded in a polysaccharide matrix that develops on the fine sediments (silt and clay) of many aquatic ecosystem worldwide of lowland fluvial streambeds. Biofilms play a key role in the energetic balance of the fluvial systems, c...
Article
Full-text available
The objective of this study is to determine which are the characteristic algal communities coating the stems of Scirpus californicus (MEY) STEUD in the Río de la Plata. Taxonomic composition, disposition of the algae in the biofilm, spatial pattems of abundance and species diversity and life-form strategies were analysed. Samples of periphyton were...
Article
Full-text available
Diatoms are useful ecological indicators because they are found in abundance in most lotic ecosystems. The use of diatoms as indicators of the quality of river waters is widely accepted based on the fact that all diatom species have optima with respect to their tolerance for environmental conditions such as nutrients, organic pollution, pH, etc. Mo...
Article
Two invertebrate species (Hyalella curvispina and Palaemonetes argentinus) and one macrophyte (Egeria densa) from a naturally high nutrient content system (Pampean rivers of La Plata, Argentina) were evaluated for their potential use in situ assays aiming to assess changes in water quality. Invertebrates were individually placed in cylindrical cham...
Article
This article reports on the ecological preferences of benthic diatoms in relation to pH, conductivity and organic pollution-eutrophication and their tolerance spectrums. Three Pampean streams subjected to different human impacts were studied. The bottom substrate of these streams is mostly composed of slime-clay with low proportions of gravel and s...
Article
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Macro-invertebrate communities and environmental variables were assessed seasonally for two years in seven streams in NorthEastern of Buenos Aires province (Argentina) in order to analyse changes in their structure and composition in relation with the quality of the water. The study includes pristine streams and others affected by urban and industr...
Article
The structure and dynamics of the phytoplankton related to water quality and hydraulic characteristics were studied in a 12 km reach of the Rodríguez Stream, a tributary of the Río de la Plata, in Argentina. This stream includes a small artificial pond. Samples were taken seasonally along a year at three sites at the stream and once at the pond. Wa...
Article
Full-text available
The rivers and streams of the Pampean plain are subjected to the impact of agriculture, cattle-raising and industrial activities. The largest urban center of Argentina is located here. The most important stresses on rivers and streams in the Pampean plain are organic enrichments (discharge of insufficiently treated sewage), nutrients, heavy metals,...
Article
Diversity of phytoplankton from the Southern Coastal Fringe of the Rio de la Plata between 58°32' and 57°41' W, up to 10 km from the coast line was analized. The present study show the results of the sampling carried outside peces between 1993-1997. The species identified were illustrated and a brief ecological and meristic description was done for...
Article
During the fall and winter of 1995, ninety-two samples were collected from twenty-three sampling stations in the Matanza-Riachuelo river basin. Epipelic diatoms and physico-chemical parameters were studied to establish water quality. Ecological methodologies (species richness, diversity and saprobity indices and multivariate analysis) were employed...