1,721,048 research outputs found
Database and Statistical Analysis: Light dependence in the phototrophy-phagotrophy balance of constitutive and non-constitutive mixotrophic protists
No full textSupplementary Material for the paper: Light dependence in the phototrophy-phagotrophy balance of constitutive and non-constitutive mixotrophic protists
The authors are: Luca Schenone, Esteban Balseiro and Beatriz Modenutti.
It contains:
-A database (.xls) including all phototrophy and phagotrophy data of mixotrophic protists obtained from previous published works of primary production and bacterivory experiments.
-A R script with the data analysis (modelling, error functions and plotting).Fil: Schenone, Luca. Universidad Nacional del Comahue. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina.Fil: Schenone, Luca. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Balseiro, Esteban. Universidad Nacional del Comahue. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina.Fil: Balseiro, Esteban. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Modenutti, Beatriz. Universidad Nacional del Comahue. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina.Fil: Modenutti, Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Dataset and analysis for: "Vertical distribution of picocyanobacteria in deep lakes: the in uence of inorganic turbidity"
No full textRepositorio correspondiente al manuscrito científico "Vertical distribution of picocyanobacteria in deep lakes: the in uence of inorganic turbidity"
publicado en la revista Aquatic Sciences. Contiene:
-Archivo csv con datos limnológicos (profundidad y parámetros de luz perfil térmico) y de abundancia de picocianobacterias de lagos norpatagónicos.
-Script de RStudio Análisis estadistico y gráficos.Fil: Schenone, Luca. Universidad Nacional del Comahue. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina.Fil: Schenone, Luca. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Modenutti, Beatriz. Universidad Nacional del Comahue. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina.Fil: Modenutti, Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Balseiro, Esteban. Universidad Nacional del Comahue. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina.Fil: Balseiro, Esteban. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Database and Statistical Analysis: Light dependence in the phototrophy-phagotrophy balance of constitutive and non-constitutive mixotrophic protists
No full textSupplementary Material for the paper: Light dependence in the phototrophy-phagotrophy balance of constitutive and non-constitutive mixotrophic protists
The authors are: Luca Schenone, Esteban Balseiro and Beatriz Modenutti.
It contains:
-A database (.xls) including all phototrophy and phagotrophy data of mixotrophic protists obtained from previous published works of primary production and bacterivory experiments.
-A R script with the data analysis (modelling, error functions and plotting).Fil: Schenone, Luca. Universidad Nacional del Comahue. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina.Fil: Schenone, Luca. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Balseiro, Esteban. Universidad Nacional del Comahue. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina.Fil: Balseiro, Esteban. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Modenutti, Beatriz. Universidad Nacional del Comahue. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina.Fil: Modenutti, Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Nutrient limitation affects biofilm enzymatic activities in a glacier-fed river
No full textIn the Patagonian Andes, glaciers of Tronador Mountain are headwaters of Manso River that drains glacial waters into Lake Mascardi. The river receives different tributaries that differ in turbidity and canopy. In this scenario we performed a field study to elucidate the effect of the input of tributary streams on the elemental limitation of the biofilm of the main glacier-fed river. We analyzed through general additive models and standardized major axis regressions the activities of two extracellular enzymes, β-
glucosidase (GLU) and alkaline phosphatase (APA). We hypothesized that their ratio
would reflect stoichiometric constraints to changes in the relative availability of carbon and phosphorus due to tributary streams’ influence. Along the glacier-fed river, we observed a decrease in the glacial influence and a spatial shift in P and dissolved organic carbon availability, that affected biofilm enzymatic activity. High enzymatic activity of GLU and APA in biofilm was related to low nutrient fluxes in stream water. In addition, the analysis of GLU and APA showed a switch in elemental limitation from Climitation in headwaters to P-limitation downstream. Finally, our results showed that biofilm enzymatic activity is a good ecological indicator to analyze changes in glacier
retreat and their consequences in glacier-fed streams.Fil: Martyniuk, Nicolás. Universidad Nacional del Comahue. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina.Fil: Martyniuk, Nicolás. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Souza, Maria Sol. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche; Argentina.Fil: Bastidas Navarro, Marcela. Universidad Nacional del Comahue. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina.Fil: Bastidas Navarro, Marcela. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Balseiro, Esteban. Universidad Nacional del Comahue. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina.Fil: Balseiro, Esteban. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Modenutti, Beatriz. Universidad Nacional del Comahue. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina.Fil: Modenutti, Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Glacial recession in Andean North-Patagonia (Argentina): microbial communities in benthic biofilms of glacier-fed streams
Full text linkGlobal climate change produces impor- tant shifts in the glacial runoff, modifying the relative contributions of meltwater and glacial clay discharges into headwater streams. Physical and chemical factors of glacier-fed streams are affected, such as total suspended solids (TSS), and nutrient concentrations. Here, we analyze the composition of the biofilm bacterial community by 16S rRNA sequencing along a glacier-fed network (Upper Río Manso) located in North Patagonian Andes (Argentina). We also anayzed changes in environmental factors in relation to the bacteria composition in different seasons (spring, summer, and autumn). Our results showed that the dominant phyla were Proteobacteria, Cyanobacteria, Bacteroidota, Actinobacteriota, and Acidobacteriota. Bacterial community composition changes longitu-dinally and seasonally in relation to glacial influence
(TSS and phosphorus concentrations). We identified phylotypes of Proteobacteria (Polaromonas, Rho- doferax, and Methylotenera) that were only present in headwaters of the fluvial systems. In addition, Cyano-bacteria also presented substantial changes along the main course of Manso River and among seasons. The increase of Cyanobacteria abundance was favored by the glacial influence both longitudinally and season-ally. Overall our results contribute to the understand-ing of the patterns of biodiversity and bacterial com- position under a constant glacial retreat.Fil: Vega, Evelyn. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche; Argentina.Fil: Vega, Evelyn. Instituto de Investigaciones en Biodiversidad y Medioambiente. Laboratorio de Limnología; Argentina.Fil: Vega, Evelyn. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Bastidas Navarro, Marcela. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche; Argentina.Fil: Bastidas Navarro, Marcela. Instituto de Investigaciones en Biodiversidad y Medioambiente. Laboratorio de Limnología; Argentina.Fil: Bastidas Navarro, Marcela. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Martyniuk, Nicolás. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche; Argentina.Fil: Martyniuk, Nicolás. Instituto de Investigaciones en Biodiversidad y Medioambiente. Laboratorio de Limnología; Argentina.Fil: Martyniuk, Nicolás. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Balseiro, Esteban. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche; Argentina.Fil: Balseiro, Esteban. Instituto de Investigaciones en Biodiversidad y Medioambiente. Laboratorio de Limnología; Argentina.Fil: Balseiro, Esteban. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Modenutti, Beatriz. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche; Argentina.Fil: Modenutti, Beatriz. Instituto de Investigaciones en Biodiversidad y Medioambiente. Laboratorio de Limnología; Argentina.Fil: Modenutti, Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Precipitation patterns, dissolved organic matter and changes in the plankton assemblage in Lake Escondido (Patagonia, Argentina)
Full text linkGlobal warming affects the hydrological cycle by increasing the frequency and intensity of extreme rainfall events and dry spells. These changes potentially affect the quantity and quality of dissolved organic matter (DOM) input into lakes. In this study, we investigated if changes in precipitation over a 3-year period correspond to changes in DOM and whether these changes affect light attenuation and plankton community composition. We sampled Lake Escondido, a shallow, oligotrophic Andean lake, nine times, analyzing coloured DOM and plankton community composition. During the study period, we observed that variations in the precipitation regime correlated with DOM parameters (water colour and molecular weight), and this, in turn, affected the plankton composition. Chlorophyll a concentrations of both phytoplanktonic fractions (less than and greater than 2 μm) were related to water colour and TDP. We observed in the small fraction (2 μm) presented two biomass peaks corresponding to increases of the cyanophyte Chroococcus planctonicus and of the haptophyte Chrysochromulina parva. As precipitation decreased, the lake became more transparent, favouring C. planctonicus and mixotrophic oligotrich ciliates with endosymbiotic Chlorella. In the context of global climate change, our results highlight the potential impact of changes in precipitation patterns and, consequently, in DOM quality on the plankton community.Fil: Bastidas Navarro, Marcela Alejandra. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche. Laboratorio de Limnología; ArgentinaFil: Modenutti, Beatriz Estela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche. Laboratorio de Limnología; Argentin
Predicting dissolved organic matter lability and carbon accumulation in temperate freshwater ecosystems
No full textDissolved organic matter (DOM) dynamics influence aquatic ecosystem metabolism with ecological and biogeochemical effects. During microbial degradation, certain DOM molecules accumulate in the environments constituting the residual refractory pool that has a key role in the global carbon cycle by sequestering carbon in lakes and oceans. The present study aims to model the factors driving bacterial C-consumption, and thus predicting the potential residual carbon accumulation. We developed mechanistic models to represent bacterial C-consumption, considering the contribution of DOM quality and P and N concentrations in the total carbon pool. Based on 82 different environments we establish DOM components and nutrient concentration for deep lakes, shallow lakes, high altitude lakes, low-order streams, and wetlands from North-Andean Patagonian glacial lake district (around 41°S). We applied Bayesian methods to estimate model parameters from laboratory C-lability experiments performed in 29 environments. We tested the predictive accuracy of our models with an external dataset consisting of C-lability experiments with natural lake water enriched with organic matter from different sources. We found a model that performed excellently in both, fit to training data and prediction to external experiments. Based on the selected model, an increase in P concentration stimulates C-consumption, and an increase in the proportion of DOM protein-like compounds reduces the amount of residual C. Based on the predictive accuracy, we demonstrated that our model is very useful to anticipate C accumulation due to changes in the inputs to water bodies.Fil: Bastidas Navarro, Marcela. Universidad Nacional del Comahue. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina.Fil: Bastidas Navarro, Marcela. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Schenone, Luca. Universidad Nacional del Comahue. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina.Fil: Schenone, Luca. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Martyniuk, Nicolás. Universidad Nacional del Comahue. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina.Fil: Martyniuk, Nicolás. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Vega, Evelyn. Universidad Nacional del Comahue. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina.Fil: Vega, Evelyn. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Balseiro, Esteban. Universidad Nacional del Comahue. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina.Fil: Balseiro, Esteban. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Modenutti, Beatriz. Universidad Nacional del Comahue. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina.Fil: Modenutti, Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Alien vs. native plants in a Patagonian wetland: Elemental ratios and ecosystem stoichiometric impacts
Full text linkWetlands are subject to invasion by exotic plant species, especially during the dry season when they resemble terrestrial systems; therefore, terrestrial plants could exploit this situation to colonize this environment. We analyzed P. anserina invading Patagonian wetlands in terms of elemental ratios that would modify wetland stoichiometry due to organic matter inputs. We studied the elemental relationship (carbon/nitrogen/phosphorus) of P. anserina in comparison with native emergent macrophytes (Eleocharis pachicarpa and Carex aematorrhyncha). These plant species are common and dominant in the wetland. Additionally, we analyzed the presence of mycorrhizal fungi in the roots and their proportion of root infection. Our study reveals that the invasive species presented nutrient (especially phosphorus) allocation in roots and differences in mycorrhizal infection, with a predominance of arbuscular mycorrhiza, compared with native species. During flooded periods with the decay of aerial parts, P. anserina stores phosphorus in the roots and releases dissolved organic matter of high molecular weight molecules, high color, and a high C-to-nutrient ratio in comparison with native macrophytes. These results show the strategy of an invasive terrestrial plant in temporary aquatic systems, and how the elemental relationships of the invasive plant can modify the stoichiometry of the environment.Fil: Cuassolo, Florencia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; ArgentinaFil: Balseiro, Esteban Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; ArgentinaFil: Modenutti, Beatriz Estela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentin
Goose and hare faeces as a source of nutrients and dissolved organic matter for bacterial communities in the newly formed proglacial lake Ventisquero Negro (Patagonia, Argentina)
No full textDissolved organic matter (DOM) input is a key factor for freshwater ecology, since it regulates many aspects of aquatic ecosystem metabolism. Aquatic and terrestrial animals that inhabit or frequent aquatic environments also influence the DOM inputs via their faeces, supplying nutrients such as carbon (C), nitrogen (N), and phosphorus (P). Here, we analyse the response of a bacterial community in the newly formed proglacial Lake Ventisquero Negro (Mount Tronador) to the addition of dissolved nutrients from faeces leachate of the native goose (Chloephaga poliocephala Sclater, 1857; locally called ‘‘cauque´n’’) and the European hare (Lepus europaeus Pallas, 1778). A laboratory incubation experiment was carried out with unenriched lake water and lake water enriched with leachate from hare or goose faeces. The results showed that faeces and leachates of geese were richer in nutrients than those of hares. Spectrofluorometric analysis of the DOM also showed differences between the two sources.Fil: Vega, Evelyn Nathalie. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche. Laboratorio de Limnología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; ArgentinaFil: Bastidas Navarro, Marcela Alejandra. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche. Laboratorio de Limnología; ArgentinaFil: Modenutti, Beatriz Estela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche. Laboratorio de Limnología; Argentin
Phylogenetic diversity of non-marine picocyanobacteria
Full text linkWe studied the phylogenetic diversity of nonmarine picocyanobacteria broadening the sequence data set with 43 new sequences of the 16S rRNA gene. The sequences were derived from monoclonal strains isolated from four volcanic high-altitude athalassohaline lakes in Mexico, five glacial ultraoligotrophic North Patagonian lakes and six Italian lakes of glacial, volcanic and morenic origin. The new sequences fall into a number of both novel and previously described clades within the phylogenetic tree of 16S rRNA gene. The new cluster of Lake Nahuel Huapi (North Patagonia) forms a sister clade to the subalpine cluster II and the marine Synechococcus subcluster 5.2. Our finding of the novel clade of ‘halotolerants’ close to the marine subcluster 5.3 (Synechococcus RCC307) constitutes an important demonstration that euryhaline and marine strains affiliate closely. The intriguing results obtained shed new light on the importance of the nonmarine halotolerants in the phylogenesis of picocyanobacteria.Fil: Callieri, Cristiana. Consiglio Nazionale delle Ricerche. Istituto per lo Studio degli Ecosistemi; ItaliaFil: Coci, Manuela. Consiglio Nazionale delle Ricerche. Istituto per lo Studio degli Ecosistemi; ItaliaFil: Corno, Gianluca. Consiglio Nazionale delle Ricerche. Istituto per lo Studio degli Ecosistemi; ItaliaFil: Macek, Miroslav. Universidad Nacional Autónoma de México; MéxicoFil: Modenutti, Beatriz Estela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte. Instituto de Investigación en Biodiversidad y Medioambiente; ArgentinaFil: Balseiro, Esteban Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte. Instituto de Investigación en Biodiversidad y Medioambiente; ArgentinaFil: Bertoni, Roberto. Consiglio Nazionale delle Ricerche. Istituto per lo Studio degli Ecosistemi; Itali
- …
