A5045383994- Aquatic Ecosystems and Phytoplankton Dynamics
- Fish Ecology and Management Studies
- Marine and coastal ecosystems
- Aquatic Invertebrate Ecology and Behavior
- Freshwater macroinvertebrate diversity and ecology
- Soil and Water Nutrient Dynamics
- Microbial Community Ecology and Physiology
- Hydrology and Sediment Transport Processes
- Hydrology and Watershed Management Studies
- Environmental DNA in Biodiversity Studies
- Cryospheric studies and observations
- Wastewater Treatment and Nitrogen Removal
- Aquatic Ecosystems and Biodiversity
- Isotope Analysis in Ecology
- Arctic and Antarctic ice dynamics
- Diatoms and Algae Research
- Oceanographic and Atmospheric Processes
- Atmospheric and Environmental Gas Dynamics
- Environmental Monitoring and Data Management
- Hydrocarbon exploration and reservoir analysis
- Geology and Paleoclimatology Research
- Climate change and permafrost
- Methane Hydrates and Related Phenomena
- Water Quality Monitoring Technologies
- Scientific Computing and Data Management
University of Applied Sciences and Arts of Southern Switzerland
2016-2025
Ospedale Regionale di Mendrisio
2023
Università della Svizzera italiana
2022
Centre National de la Recherche Scientifique
2012-2014
Université Claude Bernard Lyon 1
2012-2014
Colorado State University
2009-2013
Umeå University
2005-2007
Cardiff University
2003-2005
University of Wales
2002
Abstract Lake surfaces are warming worldwide, raising concerns about lake organism responses to thermal habitat changes. Species may cope with temperature increases by shifting their seasonality or depth track suitable habitats, but these be constrained ecological interactions, life histories limiting resources. Here we use 32 million measurements from 139 lakes quantify change (percentage of non-overlap) and assess how this is exacerbated potential constraints. Long-term resulted in an...
Restoration schemes often rely on the assumption that enhancing habitat complexity through addition of in-stream structures such as boulders and woody debris leads to increased biodiversity, but evidence for this is scarce. We compared structural heterogeneity fish invertebrate diversity at restored, unrestored, reference sites tributaries Ume River, northern Sweden, where several kilometers streams have been restored from channelization placement into channel. Structural study was assessed...
Summary Increasing degradation of ecological conditions in streams because human activities has prompted widespread restoration attempts; however, the consequences remain poorly understood. We explored effects through placement boulders into channel Ume River catchment northern Sweden, where tributary were extensively channelized to facilitate transport timber 19th and early 20th centuries. Retentiveness breakdown coarse particulate organic matter (CPOM), two key functions low‐order most...
Significance Reliable prediction of future climate conditions requires a thorough understanding variability throughout Earth’s history. Microbial molecular fossils, such as bacterial membrane-spanning tetraether lipids [branched glycerol dialkyl tetraethers (brGDGTs)], have proven to be particularly useful for the assessment past climatic conditions, because they occur ubiquitously in environment and show compositional changes related temperature. However, identity ecology brGDGT-producing...
Summary Effective environmental management needs models that reliably predict quantitative ecological changes as a function of restoration effort (e.g. cost) and meet expectations stakeholders. Principal threats to large rivers are linked human‐caused modifications discharge morphology channels floodplains. However, comprehensive large‐scale tests the reliability predicting consequences restoring these elements still lacking. Following governmental decision, water managers, local authorities...
Globally, lake surface water temperatures have warmed rapidly relative to air temperatures, but changes in deepwater and vertical thermal structure are still largely unknown. We compiled the most comprehensive data set date of long-term (1970-2009) summertime temperature profiles lakes across world examine trends drivers whole-lake structure. found significant increases at an average rate + 0.37 °C decade-1, comparable reported previously for other lakes, similarly consistent increasing...
Abstract The quality of lake ice is uppermost importance for safety and under-ice ecology, but its temporal spatial variability largely unknown. Here we conducted a coordinated sampling campaign across the Northern Hemisphere during one warmest winters since 1880 show that 2020/2021 commonly consisted unstable white ice, at times contributing up to 100% total thickness. We observed increased over winter season, becoming thickest constituting largest proportion layer towards end cover season...
Abstract The world's 1.4 million lakes (≥10 ha) provide many ecosystem services that are essential for human well‐being; however, only if their health status is good. Here, we reviewed common lake issues and classified them using a simple health‐based approach to outline living systems in need of oxygen, clean water balanced energy nutrient supply. main reason adopting some the terminology classification increase awareness understanding global issues. We show exposed various anthropogenic...
Despite long‐standing research, the processes that drive community assembly remain poorly understood. We censused macroinvertebrate communities and measured flood disturbance in 17 Scandinavian mountain streams to assess hypothesis are shaped by stochastic under stable conditions, increasingly deterministic as becomes more severe. Each study stream was categorized being (n=5), intermediate (n=7), or disturbed (n=5) depending on severity of scouring floods. Following spring floods, number...
Summary 1. Anthropogenic impacts on the biogeochemical cycles of nitrogen (N) and phosphorus (P) affect natural ecosystems worldwide. Modelling is required to predict where when these key nutrients limit primary production in freshwaters. 2. We reviewed 382 nutrient‐enrichment experiments examine which factors promote limitation microphytobenthos biomass by N or P streams rivers. Using regression models, we examined whether response additions could be predicted absolute concentrations water,...
Abstract We investigated microbial methane oxidation in the water column of two connected but hydrodynamically contrasting basins Lake Lugano, Switzerland. Both accumulate large amounts below their chemoclines, efficiently prevents from reaching surface waters. Here we show that meromictic North Basin column, a substantial fraction was eliminated through anaerobic (AOM) coupled to nitrite reduction by Candidatus Methylomirabilis. Incubations with 14CH4 and concentrated biomass this basin...
ABSTRACT Opinions about how disturbance affects stream biodiversity differ. Models that assume communities are shaped by biotic interactions emphasize the positive effects of (such as possible colonization species would be outcompeted under stable environmental conditions), whereas models assuming physical habitat factors negative exclusion lacking adaptations to stress). Empirical studies on macroinvertebrate assemblages show at small spatial scales, caused floods diversity negatively....
Between 1992 and 2003, we assessed the density of age-0+ brown trout (Salmo trutta) in a channelized stream northern Sweden, which was restored using two different schemes. One section by addition boulders reconstruction gravel beds (boulder + section), whereas another through only (boulder-only section). In addition, compared substrate size composition egg-to-fry survival between sections, related to area reconstructed beds. After restoration, increased significantly boulder positively...
Abstract Organotrophic denitrification is an important nitrogen (N) removal process in lakes, but alternative N reduction processes such as lithotrophic sulfur (S)-oxidizing may be greatly underappreciated. We studied the redox transition zone (RTZ) meromictic water column of North Basin Lake Lugano (Switzerland) to characterize transformation pathways coupled S and carbon (C) cycles. Incubations with 15 N-labeled unlabeled nitrate showed low rates a general limitation organic electron...
Summary 1. Despite long‐standing ecotoxicological evidence that episodes of acidification in streams are important biologically, there is still uncertainty about their effects on invertebrate communities. We surveyed 20 an acid sensitive Alpine area (Canton Ticino, Switzerland), where driven by snowmelt spring and rainstorms at other times the year. Samples water macroinvertebrates were collected pre‐event conditions (winter summer) during periods high flow (spring autumn). 2. Using pH, [Ca...