A5085712236- Freshwater macroinvertebrate diversity and ecology
- Aquatic Ecosystems and Phytoplankton Dynamics
- Aquatic Invertebrate Ecology and Behavior
- Fish biology, ecology, and behavior
- Diatoms and Algae Research
- Fish Ecology and Management Studies
- Marine and coastal ecosystems
- Soil and Water Nutrient Dynamics
- Ecology and Vegetation Dynamics Studies
- Coastal wetland ecosystem dynamics
- Water Quality and Pollution Assessment
- Conservation, Biodiversity, and Resource Management
- Marine Invertebrate Physiology and Ecology
- Marine and fisheries research
- Species Distribution and Climate Change
- Marine Toxins and Detection Methods
- Microbial Community Ecology and Physiology
- Pharmaceutical and Antibiotic Environmental Impacts
- Environmental Toxicology and Ecotoxicology
- Environmental and biological studies
- Amphibian and Reptile Biology
- Animal and Plant Science Education
- Marine Bivalve and Aquaculture Studies
- Isotope Analysis in Ecology
- Paleontology and Stratigraphy of Fossils
Universidade Federal do Rio Grande
2016-2025
Instituto de Ciencias Tecnológicas
2025
Universidade Federal do Rio Grande do Sul
2008-2022
University of Rio Grande and Rio Grande Community College
2022
Instituto
2022
Heterogeneity generated by irregularities on the surface of streambed substrates is an important determinant local species diversity algae. However, few investigators have examined effects substrate roughness composition algal growth forms and patterns distribution. We influence stream benthic assemblages through a field experiment with 2 treatments (smooth rough artificial for colonization). assessed whether richness, density, assemblage algae (all taxa those in 5 growth-form groups)...
Summary 1. Habitat heterogeneity in lotic systems is usually associated with the availability of refuges. Heterogeneous habitats (here, rough substrata) should mediate effect high‐flow disturbances by protecting benthic algae, thus increasing resistance and resilience system. Additionally, ability algae to resist a disturbance recover after it be dependent on biological traits that confer resilience. 2. We designed field experiment, simulating event bed movement, test substratum roughness...
Ecologists usually estimate means, but devote much less attention to variation. The study of variation is a key aspect understand natural systems and make predictions regarding them. In community ecology, most studies focus on local species diversity (alpha diversity), only in recent decades have ecologists devoted proper composition among sites (beta diversity). This spite the fact that first attempts beta date back pioneering work by Koch Whittaker 1950s. Progress last decade has been made...
Glyphosate-based herbicides are the most widely agrochemicals used in world. This toxic compound reaches aquatic ecosystems and can affect microalgae, which basis of trophic web main primary producers these environments. We tested sensitivity two species green algae (Chlorophyta) to a glyphosate-based herbicide (Roundup Transorb) effect contamination history population rescue. Strains Desmodesmus communis Pseudopediastrum boryanum were isolation co-occurrence two-step experiment, with three...
Food partitioning among coexisting species in different habitats remains an important research topic trophic ecology. In this work, we combined carbon and nitrogen stable isotope ratios stomach content analyses to investigate differences diet niche overlap of two congeneric juvenile mullet (Mugil curema Mugil liza) a marine surf-zone estuarine zone southern Brazil (29oS). These have contrasting levels food availability, especially terms prey diversity, with higher microalgae diversity the...
We conducted a scientometric analysis to determine the main trends and gaps of studies on use ecological niche models (ENMs) predict distribution invasive species. used database Thomson Institute for Scientific Information (ISI). found 190 papers published between 1991 2010 in 82 journals. The number was low 1990s, but began increase after 2003. One-third were by researchers from United States America, consequently, USA also most studied region. majority carried out terrestrial environments,...
Summary Reduced species richness with increased habitat simplification is a well‐known relationship in community ecology. However, can also lead to reduction beta diversity if the loss of not random. We tested hypothesis that periphytic algae lower among simple than complex substrata. conducted field experiment using (smooth) and (rough) artificial substrata colonised by calculate each substratum type. initially estimated Jaccard dissimilarity index its turnover component. As differed...
Studies in tropical streams are relatively few, and one of the still-unresolved methodological issues is sample size. Adequate size for temperate cannot be extrapolated sites, because differences species richness proportions rare species. We evaluated reliable estimation resemblance among samples macroinvertebrate assemblages inhabiting riffles streams, using autosimilarity approach. Sample sizes were much larger than those currently employed studies. Sampling units consisted individuals...
Temporal changes of assemblages may result from environmental variability and reflect seasonal dynamics their ecosystem. In the subtropics, hydrological regime is usually characterized by well-defined wet dry seasons, regulating discharge influencing a series variables that affect phytoplankton persistence. Therefore, we expect seasons are environmentally more stable than seasons. We analysed interannual assemblage (or, inversely, persistence) in subtropical reservoir sampled every austral...
Abstract Food partitioning among coexisting species is often considered advantageous to minimize niche overlap and avoid inter-specific competition. Congeneric fish such as the mullets Mugil curema liza , which co-occur across marine estuarine habitats, are good models evaluate resource use or partitioning. We used stomach contents (SCA) stable isotope analysis (SIA) assess potential trophic shifts changes in associated with transitioning from habitats. SIA included different fractions of...
Evaluating distribution patterns of species and identifying underlying responsible factors are essential to advance the understanding how communities assembled also support more effective decision-making for conservation. We evaluated occurrence a nested pattern phytoplankton among 25 shallow coastal lakes in southern Brazil. nestedness total community matrix classifications taxonomic morphologically based functional groups correlated observed with environmental landscape variables....
AIM: The uneven distribution of organisms in aquatic ecosystems is generally attributed to environmental heterogeneity both space and time, reflecting the occurrence appropriate conditions availability resources biological communities. aim this study was understand how dissimilarity phytoplankton community a large subtropical shallow lake related dissimilarities. METHODS: Biotic data were gathered at 19 sites along 90-km length Lake Mangueira. Sampling carried out quarterly during 2010 2011,...
RESUMO São apresentados os resultados do levantamento florístico das diatomáceas epilíticas no curso superior rio Antas, estado Rio Grande Sul. As coletas foram realizadas mensalmente, de julho 2005 a fevereiro 2006, em quatro estações amostrais entre 1.030 e 1.005 m altitude. Um total 38 espécies distribuídas 25 gêneros 16 famílias identificadas ilustradas. A maioria é cosmopolita, porém encontrados táxons com preferência por ambientes oligotróficos e/ou altitude, sem que mesmos fossem...