A5018335363- Fish Ecology and Management Studies
- Soil and Water Nutrient Dynamics
- Hydrology and Watershed Management Studies
- Freshwater macroinvertebrate diversity and ecology
- Hydrology and Sediment Transport Processes
- Water Quality and Pollution Assessment
- Aquatic Ecosystems and Phytoplankton Dynamics
- Marine and coastal ecosystems
- Isotope Analysis in Ecology
- Water resources management and optimization
- Aquatic Invertebrate Ecology and Behavior
- Aquaculture Nutrition and Growth
- Species Distribution and Climate Change
- Identification and Quantification in Food
- Hydrological Forecasting Using AI
- Soil erosion and sediment transport
- Land Use and Ecosystem Services
- Water-Energy-Food Nexus Studies
- Ecosystem dynamics and resilience
- Fish Biology and Ecology Studies
- Aquatic Ecosystems and Biodiversity
- Coastal wetland ecosystem dynamics
- Wildlife Ecology and Conservation
- Hydrology and Drought Analysis
- Data Analysis with R
Leibniz Institute of Freshwater Ecology and Inland Fisheries
2021-2024
University of Koblenz and Landau
2023-2024
University of Kaiserslautern
2023-2024
Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau
2023
University of Nevada, Reno
2018-2023
Kansas State University
2023
Weatherford College
2023
The University of Melbourne
2022
Oak Ridge Institute for Science and Education
2022
University of Alabama
2022
Abstract Understanding global ecological patterns and processes, from biogeochemical to biogeographical, requires broad‐scale macrosystems context for comparing contrasting ecosystems. Climate gradients (precipitation temperature) other continental‐scale shape freshwater environments due their influences on terrestrial direct indirect effects the abiotic biotic characteristics of lakes, streams, wetlands. We combined literature review, analyses open access data, logical argument assess...
Abstract Nearshore (littoral) habitats of clear lakes with high water quality are increasingly experiencing unexplained proliferations filamentous algae that grow on submerged surfaces. These algal blooms (FABs) sometimes associated nutrient pollution in groundwater, but complex changes climate, transport, lake hydrodynamics, and food web structure may also facilitate this emerging threat to lakes. A coordinated effort among members the public, managers, scientists is needed document...
Abstract Wildfire smoke often covers areas larger than the burned area, yet impacts of on nearby aquatic ecosystems are understudied. In summer 2018, wildfire covered Castle Lake (California, USA) for 55 days. We quantified influence lake by comparing physics, chemistry, productivity, and animal ecology in prior four years (2014–2017) to year (2018). Smoke reduced incident ultraviolet-B (UV-B) radiation 31% photosynthetically active (PAR) 11%. Similarly, underwater UV-B PAR decreased 65 44%,...
Terrestrial and aquatic ecosystems are connected through the exchange of nutrients, energy, organisms. Investigating spatio-temporal synchronicity (i.e., coupling decoupling) Net Primary Productivity (NPP) across these is essential for understanding their responses to current future environmental changes. While tree rings provide a robust proxy reconstructing terrestrial NPP (TNPP) its historical fluctuations under varying climatic conditions, comparable approach freshwater hindered by lack...
Riparian deforestation may strongly affect stream functioning, with consequences for biodiversity and ecosystem services. These effects can be assessed using bioindicators relating to biotic community structure functioning. We evaluated the of riparian on 1. measures aquatic benthic invertebrates, 2. an aspect leaf processing. selected sites along gradients land use in four Atlantic rainforest streams measured physical chemical properties their association deforestation. sampled...
Stream metabolism is affected by both natural and human-induced processes. While has multiple implications for ecological processes, relatively little known about how metabolic rates are influenced land use in tropical streams. In this study, we assessed the characteristics related environmental factors of six streams located a transition area from Cerrado to Atlantic Forest (São Carlos/Brazil). Three were preserved, while three flowing through more agriculturally and/or urban impacted...
Establishing reference conditions in rivers is important to understand environmental change and protect ecosystem integrity. Ranked third globally for fish biodiversity, the Mekong River has world’s largest inland fishery providing livelihoods, food security, protein local population. It therefore of paramount importance maintain water quality biotic integrity this ecosystem. We analyzed land use impacts on constituents (TSS, TN, TP, DO, NO3−, NH4+, PO43−) Lower Basin. then used a best-model...
Abstract River metabolism and, thus, carbon cycling are governed by gross primary production and ecosystem respiration. Traditionally river is derived from diel dissolved oxygen concentrations, which cannot resolve changes in Here, we compare concentrations with estimates stable isotope signatures (δ 18 O 2 ) 14 sites rivers across three biomes using Bayesian inverse modeling. We find isotopically respiration was greater the day than night for all (maximum change of 113 g m −2 d −1 , minimum...
Abstract Abundant living roots can be found in some streams and other shallow marine freshwater habitats. A reach of a small Brazilian forested stream had 28% cover by live exhibited diurnal trends dissolved oxygen that could attributed to gross primary production, but we hypothesized activity riparian tree the channel caused this pattern. During sunny periods, trees transpire deoxygenated water from canopy not dark, resulting cycles oxygen. Whole‐stream shading experiments showed...
Abstract Nutrient limitation assessment is important to understand stream ecosystem functioning. Aquatic primary producers are often limited by nitrogen, phosphorus, or both, as assessed nutrient diffusing substrata (NDS), a common method for assessing in streams. But little known regarding how this relates patterns of uptake at the whole‐stream scale. We combined two techniques examine tropical stream. First, we conducted NDS experiments using ammonium, nitrate, and phosphate alone...
While excess phosphorus typically results in the eutrophication of inland waters, there is growing evidence that nitrogen (N) and availability different N forms influence phytoplankton community composition, often favoring potentially toxic genera. In this study, environmental dynamics, structure, uptake rates were investigated two tropical reservoirs. Phytoplankton ammonium () nitrate acquisition was assessed through 15 addition experiments over 2 years. We found changes ambient nutrient...
Abstract Agricultural activities can affect the delivery of nutrients to streams, riparian canopy cover, and capacity aquatic systems process sediments. There are few measures nutrient uptake metabolism from tropical or subtropical streams in general, even fewer regions South America. We examined ammonium (NH 4 + ) soluble reactive phosphorus (SRP) retention Brazil Argentina. selected 12 with relatively little extensive agricultural activity conducted whole‐stream additions measurements...
Abstract River flows change on timescales ranging from minutes to millennia. These vibrations in flow are tuned by diverse factors globally, for example, dams suppressing multi‐day variability or vegetation attenuating flood peaks some ecosystems. The relative importance of the physical, biological, and human influencing is an active area research, as related question finding a common language describing overall regime. Here, we addressed both topics using daily river discharge data set over...
Tonle Sap lake-river floodplain ecosystem (TSE) is one of the world’s most productive freshwater systems. Changes in hydrology, climate, population density, and land use influence water quality this system. We investigated long term dynamics (22 years) space time identified potential changes nutrient limitation based on ratios inorganic nitrogen phosphorus. Water was assessed at five sites highlighting wet dry seasons. Predictors included watershed use, population, level. Most parameters...
Abstract Stream restoration efforts have aimed at increasing hydraulic residence time (HRT) and transient storage (TS) to enhance nutrient uptake, but there been few controlled studies quantifying HRT TS influences on uptake dynamics. We assessed the effects of ammonium (NH 4 + ) phosphate (PO 3− through experiments in an artificial channel draining a pristine tropical stream. experimentally dammed with weirs, progressively increase HRT, performed NH PO additions estimate each weir was...
Human activities often produce highly fragmented watersheds with respect to the distribution of vegetation, and this condition can extend from watershed boundary riparian corridor. Because streams are transport-dominated ecosystems, it is unlikely that changes in instream conditions map synchronously spatial pattern fragmentation. Riparian influences likely be propagated some distance downstream, creating a downstream "shadow" upstream conditions. To investigate over which effects still...
Abstract Leaves, epilithon, macrophytes, and fine benthic organic material are central ecosystem compartments to food webs mediate nutrient fluxes in streams. Most estimates of gross primary production ( GPP ) respiration ER made at a reach scale, averaging across compartments. Thus, there is little information on how individual contribute scale up whole‐stream watersheds. We compared , nitrogen (N) uptake (dm) stream reaches (~100 m) three sizes streams preserved Atlantic Rainforest...
Pollution abatement through phosphorus and nitrogen retention is a key ecosystem service provided by streams. Human activities have been changing in-stream nutrient concentrations, thereby altering lotic functioning, especially in developing countries. We estimated uptake metrics (ambient length, areal rate, velocity) for nitrate (NO3–N), ammonium (NH4–N), soluble reactive (SRP) four tropical Cerrado headwater streams during 2017, whole-stream addition experiments. According to multiple...
Studies of the effects landscape configuration on nutrient concentrations in aquatic systems, apart from land cover percentages, remain limited. Understanding these influences is important to guide use planning and avoid undesirable consequences artificial eutrophication. We investigated how natural attributes such as edge density, mean shape index, cohesion, contagion were related nitrate (N-NO3) phosphate (P-PO4) Brazilian streams Mexican lakes. Data collected by citizen science volunteers...