A5024176564- Soil and Water Nutrient Dynamics
- Hydrology and Watershed Management Studies
- Fish Ecology and Management Studies
- Freshwater macroinvertebrate diversity and ecology
- Wastewater Treatment and Nitrogen Removal
- Hydrology and Sediment Transport Processes
- Water Quality and Pollution Assessment
- Marine and coastal ecosystems
- Soil erosion and sediment transport
- Urban Stormwater Management Solutions
- Microbial Community Ecology and Physiology
- Isotope Analysis in Ecology
- Aquatic Invertebrate Ecology and Behavior
- Constructed Wetlands for Wastewater Treatment
- Diatoms and Algae Research
- Groundwater flow and contamination studies
- Water Treatment and Disinfection
- Aquatic Ecosystems and Phytoplankton Dynamics
- Environmental DNA in Biodiversity Studies
- Water Quality Monitoring Technologies
- Fecal contamination and water quality
- Microplastics and Plastic Pollution
- Hydrological Forecasting Using AI
- Water Quality Monitoring and Analysis
- Geology and Paleoclimatology Research
Centre d'Estudis Avançats de Blanes
2016-2025
Consejo Superior de Investigaciones Científicas
2008-2023
Swiss Federal Institute of Aquatic Science and Technology
2021
University of Birmingham
2021
Ecological Society of America
2017-2018
John Wiley & Sons (United States)
2017-2018
Schiller (France)
2017
Universitat Politècnica de València
2005-2006
University of Girona
2004
Arizona State University
1997-2000
A comparative 15 N-tracer study of nitrogen dynamics in headwater streams from biomes throughout North America demonstrates that exert control over nutrient exports to rivers, lakes, and estuaries. The most rapid uptake transformation inorganic occurred the smallest streams. Ammonium entering these was removed water within a few tens hundreds meters. Nitrate also stream but traveled distance 5 10 times as long, on average, ammonium. Despite low ammonium concentration water, nitrification...
1. We studied whole‐ecosystem metabolism in eight streams from several biomes North America to identify controls on the rate of stream over a large geographic range. The had climates ranging tropical cool‐temperate and humid arid were all relatively uninfluenced by human disturbances. 2. Rates gross primary production (GPP), ecosystem respiration (R) net (NEP) determined using open‐system, two‐station diurnal oxygen change method. 3. Three general patterns evident among streams: (1) high GPP...
Urban streams have been the focus of much research in recent years, but many questions about mechanisms driving urban stream syndrome remain unanswered. Identification key is an important step toward effective, efficient management to meet societal goals. We developed a list priority by: 1) soliciting input from interested scientists via listserv and online survey, 2) holding open discussion on at Second Symposium Urbanization Stream Ecology, 3) reviewing literature preparation this paper....
Inhibition by light potentially influences the distribution of ammonia oxidizers in aquatic environments and is one explanation for nitrite maxima near base euphotic zone oceanic waters. Previous studies photoinhibition have been restricted to bacterial oxidizers, rather than archaeal which dominate marine environments. To compare specific growth rates two ammonia-oxidizing archaea (Nitrosopumilus maritimus Nitrosotalea devanaterra) bacteria (Nitrosomonas europaea Nitrosospira multiformis)...
Abstract The movement of water, matter, organisms, and energy can be altered substantially at ecohydrological interfaces, the dynamic transition zones that often develop within ecotones or boundaries between adjacent ecosystems. Interdisciplinary research over last two decades has indicated interfaces are “hot spots” ecological, biogeochemical, hydrological processes may provide refuge for biota during extreme events. Ecohydrological have significant impact on global biogeochemical cycles,...
Summary 1. The Lotic Intersite Nitrogen eXperiment (LINX) was a coordinated study of the relationships between North American biomes and factors governing ammonium uptake in streams. Our objective to relate inter‐biome variability physical, chemical biological processes. 2. Data were collected from 11 streams ranging arctic tropical desert rainforest. Measurements at each site included hydraulic characteristics, parameters, whole‐stream metabolism uptake. Ammonium measured by injection 15...
Detailed studies of stream N uptake were conducted in a prairie reach and gallery forest Kings Creek on the Konza Prairie Biological Station. Nutrient rates measured with multiple short-term enrichments NO3− NH4+ at constant addition spring summer 1998. was also 15N-NH4+ tracer additions unlabeled 12 sites across North America. Concurrent conservative used to account for dilution all experiments. rate per unit area (Ut) positively correlated nutrient concentration (r2 = 0.41, log–log...
ABSTRACT We tested the effect of nutrient inputs from wastewater treatment plants (WWTPs) on stream retention efficiency by examining longitudinal patterns ammonium, nitrate, and phosphate concentrations downstream WWTP effluents in 15 streams throughout Catalonia (Spain). hypothesized that large loadings would saturate communities, lowering (i.e., relative to flux) less polluted streams. Longitudinal variation ambient concentration reflected net result physical, chemical, or biological...
Nutrient uptake length is an important parameter for quantifying nutrient cycling in streams. Although tracer additions are the preferred method measuring under ambient concentrations, short-term addition experiments have more frequently been used to estimate Theoretical analysis of relationship between determined by (SW′) and (SW) predicted that SW′ should be consistently longer than SW, overestimate related level above concentrations degree limitation. To test these predictions, we data...
Nutrient retention studies were conducted in two second—order streams located north of Barcelona (Spain) that differed watershed lithology, soil type, and vegetation. La Solana drains a calcareous watershed, whereas Riera Major siliceous watershed. Within each stream we defined reaches (50 m) differing channel form canopy cover: bedrock sand—cobble. The characterized by dominance outcrop sparse canopy, while the sand—cobble had sand, cobble, boulder substrata dense canopy. Phosphate ammonium...
Summary 1. Nutrient diffusing substrata (NDS) were used to determine the relative importance of nutrients and light as potential limiting factors periphyton biomass nitrogen (N) uptake in Mediterranean streams subjected different human impacts. The examined phosphorus (P) N, we also further differentiated between response communities N species (i.e. NO 3 ‐N NH 4 ‐N). To examine effect on biomass, chlorophyll a accrual rates NDS located at open closed canopy sites compared. nutrient...
Abstract Headwater streams remove, transform, and store inorganic nitrogen (N) delivered from surrounding watersheds, but excessive N inputs human activity can saturate removal capacity. Most research has focused on quantifying the water column over short periods in individual reaches, these ecosystem‐scale measurements suggest that assimilatory uptake accounts for most removal. However, cross‐system comparisons addressing relative role of particular biota responsible incorporating into...
Intermittent rivers and ephemeral streams (IRES) encompass fluvial ecosystems that eventually stop flowing run dry at some point in space time. During the phase, channels of IRES consist mainly riverbeds (DRBs), prevalent yet widely unexplored ecotones between wet phases can strongly influence biogeochemistry networks. DRBs are often overlooked because they do not strictly belong to either domain soil or freshwater science. Due this dual character DRBs, we suggest concepts knowledge from...
Abstract Hyporheic zones increase freshwater ecosystem resilience to hydrological extremes and global environmental change. However, current conceptualizations of hyporheic exchange, residence time distributions, the associated biogeochemical cycling in streambed sediments do not always accurately explain complexity observed streams rivers. Specifically, existing conceptual models insufficiently represent coupled transport reactivity along groundwater surface water flow paths, role...
We examined the effects of riparian vegetation removal on algal dynamics and stream nutrient retention efficiency by comparing NH4-N PO4-P uptake lengths from a logged an unlogged reach in Riera Major, forested Mediterranean northeastern Spain. From June to September 1995, we executed 6 short-term additions N (as NH4Cl) P Na2HPO4) 200-m section measure lengths. The study site included 2 clearly differentiated reaches terms canopy cover trees: first 100 m were completely (i.e., reach)...
The objectives of this study were 1) to compare Sonoran Desert streams with other in terms retention efficiency nitrate; 2) examine the effects a flood on nitrate and determine which factors control surface stream subsystem Sycamore Creek, Arizona; 3) short-term nutrient addition technique computations based upon natural gradients. From June September 1995, we did 8 chloride additions (4 before 4 after flood) 240-m reach measure uptake length as an index nitrate. We also calculated lengths...
We propose the experimental use of resazurin (Raz) and develop a metabolically active transient storage (MATS) model to include processes that may provide additional information on from biogeochemical perspective in stream ecosystems. Raz is phenoxazine compound reduces irreversibly resorufin (Rru) presence aerobic bacteria. was added as tracer 128‐m reach forested second‐order Riera de Santa Fe del Montseny (Catalonia, NE Spain), along with conservative tracer, NaCl. transformed Rru at rate...
A “smart” tracer is a that provides, directly or through measurement of its concentration in combination with another compound, at least one “bit” more information about the environment which it travels than conservative tracer. In this study we propose and present chemical compound resazurin as smart to assess coupling between solute transport microbiological activity sediment‐water interfaces freshwaters. Resazurin weakly fluorescent redox‐sensitive dye undergoes an irreversible reduction...
[1] Water transient storage zones are hotspots for metabolic activity in streams although the contribution of different types to whole-reach is difficult quantify. In this study we present a method measure fraction that metabolically active (MATS) two consecutive reaches with contrasting hydrological and biological characteristics. We used combined additions resazurin (Raz) Cl reach scoured bedrock containing deep alluvial deposit. The MATS measured 0.002 m2 (37% storage) 0.291 (100%...