A5048405641- Aquatic Ecosystems and Phytoplankton Dynamics
- Marine and coastal ecosystems
- Microbial Community Ecology and Physiology
- Freshwater macroinvertebrate diversity and ecology
- Fish Ecology and Management Studies
- Protist diversity and phylogeny
- Environmental Toxicology and Ecotoxicology
- Diatoms and Algae Research
- Aquatic Invertebrate Ecology and Behavior
- Fish biology, ecology, and behavior
- Biocrusts and Microbial Ecology
- Physiological and biochemical adaptations
- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Marine Biology and Ecology Research
- Marine Bivalve and Aquaculture Studies
- Soil and Water Nutrient Dynamics
- Genomics and Phylogenetic Studies
- Hydrology and Watershed Management Studies
- Ocean Acidification Effects and Responses
- Aquatic Ecosystems and Biodiversity
- Coastal wetland ecosystem dynamics
- Polar Research and Ecology
- Glutathione Transferases and Polymorphisms
- Environmental and Cultural Studies in Latin America and Beyond
National University of Comahue
2015-2024
Consejo Nacional de Investigaciones Científicas y Técnicas
2015-2024
Centro Científico Tecnológico - Patagonia Norte
2020
Bariloche Atomic Centre
1993-2013
Centro Científico Tecnológico - Tucumán
2010
National University of Río Negro
2004
Diffuse attenuation coefficients ( K d ) for solar UV radiation (UVR) (305, 320, 340, 380 nm, and PAR) were measured in the mixed layer of 65 lake sites Alaska, Colorado, Pennsylvania Bariloche region Argentina. Integrated samples water concurrently collected, a multivariate approach was used to model with number optical chemical variables. Substantial variation transparency observed among lakes. Attenuation depths z 1% UV‐B ranged from several centimeters > 10 m. In some shallow, low DOC...
We studied the phylogenetic diversity of nonmarine picocyanobacteria broadening sequence data set with 43 new sequences 16S rRNA gene. The were derived from monoclonal strains isolated four volcanic high-altitude athalassohaline lakes in Mexico, five glacial ultraoligotrophic North Patagonian and six Italian glacial, morenic origin. fall into a number both novel previously described clades within tree cluster Lake Nahuel Huapi (North Patagonia) forms sister clade to subalpine II marine...
Food webs from oligotrophic Andean lakes of Bariloche region (41°S) are described. Their peculiarities in comparison with Northern Hemisphere studies noted. The endemic species composition, the extended euphotic zone, and oxygenated bottom allow a particular structure pelagic benthic food webs. Experimental work communities indicates that models based only on zooplankton body size questionable nutrient enrichment does not necessarily lead to positive effect herbivorous populations....
Glaciers around the globe are melting rapidly, threatening receiving environments of world's fresh water reservoirs with significant changes. The meltwater, carried by rivers, contains large amounts suspended sediment particles, producing longitudinal gradients in lakes. These may result changes light : nutrient ratio that affect grazer performance altering elemental food quality. Thus, glacial induce a shift phytoplankton carbon and hence influence dominance herbivorous zooplankton through...
Volcanic eruptions that shape the earth's surface can have major effect on ecosystems and, as natural experiments, yield insights into ecological dynamics. On 04 June 2011, a mega‐eruption in Puyehue volcanic complex (Chile) discharged massive amounts of ash and pumice. Using long‐term data from five North Andean Patagonian lakes (Espejo, Correntoso, Nahuel Huapi, Gutiérrez, Mascardi) received differing levels ash, we show that, Lakes Espejo, these inputs resulted 1.5‐ to 8‐fold increases...
: Introduction of salmonids is a common and widespread practice in rivers lakes Patagonia, but their impacts remain poorly understood. We analyse the effect exotic introduced (rainbow trout Oncorhynchus mykiss) on benthic macroinvertebrate community low order streams. conducted field survey three headwater streams (Challhuaco, Cascada Pescadero streams) northern Andean-Patagonian region (around 41 ° S 1500m above sea level). The are canopied by deciduous Nothofagus pumi-lio forest. On each...
Receding glaciers are among the most obvious changes caused by global warming, and glacial meltwater entering lakes generally forms plumes of particles. By taking vertical samples along a horizontal gradient from such particle source, we found that photosynthetically active radiation (PAR) ultraviolet (UVR) attenuated 20–25% faster close to inflow suspended particles compared with more transparent part gradient. All sampled stations had deep chlorophyll (Chl a) maximum at 15–20 m which was...
We experimentally tested the effect of food quality (phosphorus [P] : carbon [C] ratio) on response antioxidant enzymes to ultraviolet radiation (UVR) in Daphnia commutat a fed with Chlamydomonas reinhardtii . Algal cultures were grown at different concentrations phosphorus and light intensities, resulting significant differences P :C ratios (mmol P[µmol C] −1 ; 6.05, 1.70, 0.83). After 12 d D. commutata growth under these three treatments, we observed individual biomass protein content...
ABSTRACT Volcanic eruptions are a widespread force of geological and ecological disturbance present recurrent opportunities for the study biological responses to novel habitat formation. However, scientific such events is difficult given their short duration often distant location. Here we report results from opportunistic sampling unique volcano-generated habitats formed during 2011 explosive eruption in Puyehue-Cordón Caulle complex (Chile), when massive amounts pumice were ejected,...
Organisms usually face and acquire food that is elementally imbalanced, although they are affected by its quality, do not reflect the elemental composition of their resources. We analysed whether homeostasis during ontogeny freshwater calanoid copepods varied with herbivorous or omnivorous diet. Boeckella gracilis B. brevicaudata species, whereas Parabroteas sarsi changes feeding strategy throughout ontogeny. hypothesized homeostatic investment would decrease when matches consumer...
Ultraviolet radiation (UVR) causes physical damage to DNA, carboxylation of proteins and peroxidation lipids in copepod crustaceans, ubiquitous abundant secondary producers most aquatic ecosystems. Copepod adaptations for long duration exposures include changes behaviour, pigmentation ultimately morphology. Adaptations short-term are little studied. Here we show that short-duration exposure UVR the freshwater calanoid copepod, Eudiaptomus gracilis, rapidly activate production enzymes prevent...
We analyzed the effects of UV radiation (UVR) on acetylcholinesterase (AChE) activity in two calanoid copepods, Boeckella gibbosa and Parabroteas sarsi that inhabit Patagonian shallow lakes. studied effect experimental UVR (UV-B UV-A) exposure AChE relation to basal antioxidant capacities both copepods. Our experiments showed can effectively depress activity, although with differences between species. In copepods was affected by UV-B, whereas UV-A only B. gibbosa. Both also differed body...
We investigated the community composition and relative size‐shape distribution of bacterial assemblages in deep transparent lakes, where bacteria may be affected by harmful ultraviolet radiation (UVR). Summer samples euphotic zones nine ultraoligotrophic lakes located different drainage basins between 40°27' 42°49'S North Andean Patagonia were analyzed for diversity denaturating gradient gel electrophoresis morphology (free‐living cocci rods vs. filamentous forms) relation to environmental...
1. Environmental factors fluctuate spatially and temporally, organisms that can alter phenotype in response to these changes may increase their fitness. Zooplankton are known be able induce body pigmentation ultraviolet radiation (UVR) reduce the when exposed fish predators. Hence, reduced because of presence could potentially lead UVR damage, which calls for alternative protective mechanisms. 2. We zooplankton cues stress assess whether cellular antioxidants flexible predation defences. 3....