A5055344895- Aquatic Ecosystems and Phytoplankton Dynamics
- Marine and coastal ecosystems
- Fish Ecology and Management Studies
- Environmental Toxicology and Ecotoxicology
- Physiological and biochemical adaptations
- Aquaculture Nutrition and Growth
- Pharmaceutical and Antibiotic Environmental Impacts
- Algal biology and biofuel production
- Soil and Water Nutrient Dynamics
- Microbial Community Ecology and Physiology
- Aquatic Ecosystems and Biodiversity
- Metabolomics and Mass Spectrometry Studies
- Freshwater macroinvertebrate diversity and ecology
- Pesticide and Herbicide Environmental Studies
- Water Quality and Pollution Assessment
- Advanced Proteomics Techniques and Applications
- Tropical and Extratropical Cyclones Research
- Biocrusts and Microbial Ecology
- Protein Hydrolysis and Bioactive Peptides
- Agriculture Sustainability and Environmental Impact
- Water Treatment and Disinfection
- Photovoltaic Systems and Sustainability
- Aquatic Invertebrate Ecology and Behavior
- Polyamine Metabolism and Applications
- Diatoms and Algae Research
Oakland University
2022-2025
Aquatic Systems (United States)
2019-2023
Baylor University
2019-2023
New College of Florida
2021
University of Toronto
2016-2019
Trent University
2009-2018
The Scarborough Hospital
2016-2018
Cornell University
2017
Clay Technology (Sweden)
2015
Johannes Gutenberg University Mainz
2005
Summary The role of nutrition in linking animals with their environment is increasingly seen as fundamental to explain ecological interactions. two currently predominant frameworks for exploring questions nutritional ecology – Nutritional Geometry (NG) and Ecological Stoichiometry (ES) share common features, but also differ goals origins. NG originates from behavioural using terrestrial insects model organisms tightly controlled feeding experiments, while ES biogeochemistry focusing on the...
Abstract Phytoplankton responses to nutrient enrichment are often assumed be universal, but in practice they can significantly vary because the effect size an increased supply of one may depend on availability other. Here, we used two complementary two‐way factorial experiments determine how lake phytoplankton N and P with increasing concentrations other nutrient. We manipulated dissolved a 4‐d bioassay conducted measured/determined chlorophyll carbon (C)‐specific growth rates, size‐classes,...
The use of consumer products and pharmaceuticals that act as contaminants entering waterways through runoff wastewater effluents alters aquatic ecosystem health. Traditional toxicological endpoints may underestimate the toxicity contaminants, lethal concentrations are often orders magnitude higher than those found within freshwater ecosystems. While newer techniques examine metabolic responses sublethal contaminant exposure, there has been no direct comparison with ontogeny in Daphnia. It...
Harmful algal blooms (HABs) are increasing in magnitude, frequency, and duration globally. Even though a limited number of phytoplankton species can be toxic, they becoming one the greatest water quality threats to public health ecosystems due their intrinsic toxicity humans numerous interacting factors that undermine HAB forecasting. Here, we show carbon:nitrogen:phosphorus (C:N:P) stoichiometry common toxic species, Microcystis, regulates toxin quotas during through tradeoff between...
In vivo nuclear magnetic resonance (NMR) spectroscopy is a particularly powerful technique, since it allows samples to be analyzed in their natural, unaltered state, criteria paramount for living organisms. this study, novel continuous low-volume flow system, suitable NMR metabolomics studies, demonstrated. The system improved locking, shimming, and water suppression, as well allowing the use of trace amounts expensive toxic contaminants or low volumes precious natural environmental...
Poor diet quality frequently constrains the growth and reproduction of primary consumers, altering their population dynamics, interactions in food webs, contributions to ecosystem services such as nutrient cycling. The identification measurement an animal's nutritional state are thus central studying connections between animal ecology. Here we show how a freshwater invertebrate, Daphnia magna, can be determined by analyzing its endogenous metabolites using hydrogen nuclear magnetic...
Abstract Harmful algal blooms (HABs) frequently occur in eutrophic water bodies, which are often dominated by either non‐diazotrophic or diazotrophic strains of cyanobacteria. The occurrence HABs is associated with multiple environmental factors that affect cyanobacterial growth, though adaptations cyanobacteria to respond diverse growing conditions largely unknown. One factor affecting HAB persistence the ability synthesize and metabolize large biomolecules such as light harvesting pigments...
ABSTRACT Objective Successful invasion of aquatic invasive species (AIS) hinges on effective dispersal, which is often facilitated by human activities. A common dispersal mechanism “hitchhiking’” recreational gear and equipment, including fishing boats waders. Two recent co-occurring AIS in the rivers Laurentian Great Lakes region are New Zealand mudsnails (NZMS) Potamopyrgus antipodarum algae didymo Didymosphenia geminata. Here, we developed assessed an angling-gear chemical-decontamination...
Declines in environmental calcium (Ca) and phosphorus (P) concentrations have occurred over the past 30 yrs lakes across Canadian Shield southern Ontario, these reductions appear to be placing strong constraints on populations of Daphnia this region. Here, we report results from a factorial manipulation Ca food P content under controlled laboratory conditions where measured resulting changes daphnid elemental content, individual growth survival, life history traits related population growth....
Consumer body stoichiometry is a key trait that links organismal physiology to population and ecosystem-level dynamics. However, as elemental composition has traditionally been considered be constrained within species, the ecological evolutionary factors shaping consumer have not clearly resolved. To this end, we examined causes extent of variation in phosphorus (P) content expression P-linked traits, mass specific growth rate (MSGR), P use efficiency (PUE) keystone aquatic Daphnia using...
Abstract Freshwater ecosystems are experiencing increased salinization. Adaptive management of harmful algal blooms (HABs) contributes to eutrophication/salinization interactions through the hydrologic transport coastal environments. We examined how nutrients and salinity interact affect growth, elemental composition, cyanotoxin production/release in two common HAB genera. Microcystis aeruginosa (non‐nitrogen [N]‐fixer microcystin‐LR producer [MC‐LR]) Aphanizomenon flos‐aquae (N‐fixer...
High-frequency water quality monitoring is rapidly growing in freshwater research and management. Sensor deployments at fixed depths naturally formed lakes dominate the current understanding of ecosystem dynamics, with comparatively few studies focusing on reservoirs. Here we examined how environmental parameters affect column stability dissolved oxygen (DO) dynamics a North Texas eutrophic reservoir. We used an autonomous profiler that recorded temperature, DO, pH as well wind speed,...
ABSTRACT The heterofermentative lactic acid bacteria Oenococcus oeni and Leuconostoc mesenteroides are able to grow by fermentation of pyruvate as the carbon source (2 → 1 lactate + acetate CO 2 ). growth yields amount 4.0 5.3 g (dry weight)/mol pyruvate, respectively, suggesting formation 0.5 mol ATP/mol pyruvate. Pyruvate is oxidatively decarboxylated dehydrogenase acetyl coenzyme A, which then converted acetate, yielding ATP. For NADH reoxidation, one further molecule reduced lactate....
We investigated the effect of land cover on metabolic scaling freshwater crayfish, Orconectes rusticus, by comparing field rate (FMR) populations from streams flowing through different natural and agricultural cover. When data all were pooled, mass-scaling exponent was approximately 0.71. However, both strength nature FMR-mass relationships varied among (slopes 0.61 to 0.91). This variability in exponents significantly correlated with two types cover, proportion monoculture (row cropping)...
Abstract Food quality and temperature can affect zooplankton production in lakes by altering organismal metabolism. However, the influence of these factors on consumer nutritional physiology population biomass remains relatively understudied natural populations. Here, we examined seasonal changes body stoichiometry, biochemistry, two Daphnia species collected from separate differing dietary phosphorus (P) supply. quality, measured as seston carbon:P (C:P) ratios, varied throughout study each...
The growth of animal consumers is affected by the balance elements in their diet with transition between limitation one element to another known as threshold elemental ratio (TER). Precise estimates TERs levels uncertainty have yet be generated for most zooplankton consumers. We determined TER carbon (C) and phosphorus (P) a common lake zooplankter, Daphnia magna, using experimental measurements theoretical considerations. responses food C:P ratios across relatively narrow range (80-350) an...