A5081114231- Amphibian and Reptile Biology
- Environmental Toxicology and Ecotoxicology
- Fish Ecology and Management Studies
- Animal Behavior and Reproduction
- Smart Materials for Construction
- Insect and Pesticide Research
- Urban Stormwater Management Solutions
- Pesticide and Herbicide Environmental Studies
- Species Distribution and Climate Change
- Freshwater macroinvertebrate diversity and ecology
- Plant and animal studies
- Wildlife-Road Interactions and Conservation
- Parasite Biology and Host Interactions
- Insect and Arachnid Ecology and Behavior
- Per- and polyfluoroalkyl substances research
- Helminth infection and control
- Physiological and biochemical adaptations
- Parasites and Host Interactions
- Toxic Organic Pollutants Impact
- Atmospheric chemistry and aerosols
- Turtle Biology and Conservation
- Insect-Plant Interactions and Control
- Pharmaceutical and Antibiotic Environmental Impacts
- Aquatic Invertebrate Ecology and Behavior
- Dermatological diseases and infestations
Purdue University West Lafayette
2022-2025
Rensselaer Polytechnic Institute
2015-2024
University of Notre Dame
2019-2024
Environmental Protection Agency
2024
New Mexico Cancer Center
2022
University of New Mexico
2022
University of South Florida
2018-2019
Jones College
2018
Google (United States)
2018
The University of Texas at El Paso
2016
With the increased use of glyphosate-based herbicides (marketed under several names, including Roundup and Vision), there has been a concomitant concern about unintended impacts that particular formulations containing popular surfactant polyethoxylated tallowamine (POEA) might have on amphibians. Published studies examined relatively small number anuran species (primarily from Australia eastern North America) and, surprisingly, no salamanders. Using formulation glyphosate (Roundup Original...
The application of road deicing salts in northern regions worldwide is changing the chemical environment freshwater ecosystems. Chloride levels many lakes, streams, and wetlands exceed chronic acute thresholds established by United States Canada for protection biota. Few studies have identified impacts stream wetland communities none examined lake communities. We tested how relevant concentrations salt (15, 100, 250, 500, 1000 mg Cl- /L) interacted with experimental containing two or three...
Documenting trends of stream macroinvertebrate biodiversity is challenging because biomonitoring often has limited spatial, temporal, and taxonomic scopes. We analyzed composition assemblages >500 genera, spanning 27 years, 6131 sites across forested, grassland, urban, agricultural land uses throughout the United States. In this dataset, density declined by 11% richness increased 12.2%, insect 23.3 6.8%, respectively, over years. addition, differences in between urban versus forested...
Pesticides are commonly used for health and economic benefits worldwide, but increased use has led to contamination of aquatic habitats. To understand potential impacts on nontarget organisms in these habitats, toxicologists generally short-term (4-d) toxicity tests model organisms. For most pesticides, few amphibian have been conducted, there is growing concern about the impact pesticides populations. insecticide endosulfan, previous studies found that low concentrations can be very highly...
Abstract The quality of freshwater ecosystems is decreasing worldwide because anthropogenic activities. For example, nutrient over‐enrichment associated with agricultural, urban, and industrial development has led to an acceleration primary production, or eutrophication. Additionally, in northern areas, deicing salts that are evolutionary novel stressor have caused chloride levels many freshwaters exceed thresholds established for environmental protection. Even if excess nutrients road often...
Abstract Understanding population responses to rapid environmental changes caused by anthropogenic activities, such as pesticides, is a research frontier. Genetic assimilation ( GA ), process initiated phenotypic plasticity, one mechanism potentially influencing evolutionary novel environments. While theoretical and laboratory suggests that has the potential influence trajectories, few studies have assessed its role in evolution of wild populations experiencing Using insecticide, carbaryl,...
Summary The application of deicing road salts began in the 1940s and has increased drastically regions where snow ice removal is critical for transportation safety. most commonly applied salt sodium chloride (NaCl). However, costs NaCl, its negative effects on human health, degradation roadside habitats driven agencies to seek alternative organic additives reduce rate NaCl or increase effectiveness. Few studies have examined aquatic ecosystems, but none explored potential impacts...
The widespread use of pesticides raises the possibility that non-target organisms might also be affected. To assess this, traditional approach has been to conduct short-term laboratory experiments spanning a range lethal concentrations and some longer-duration at sublethal concentrations. While this very useful, less attention paid timing exposure impacts multiple, small exposures versus single, large exposures. We examined role application amount, timing, frequency using outdoor mesocosm...
Toxicity assessments on nontarget organisms have largely been addressed using short-term, single-species laboratory experiments. Although extremely helpful, these experiments inherently lack many pervasive ecological stressors found in nature. Though a substantial challenge, incorporating contaminant studies would shed light potential synergistic effects. For the world's leading herbicide, glyphosate, we know little about how natural affect toxicity to organisms. To explore stress of...
Pesticides commonly occur in aquatic systems and pose a substantial challenge to the conservation of many taxa. Ecotoxicology has traditionally met this by focusing on short-term, single-species tests conducting risk assessments based most sensitive species tested. Rarely have ecotoxicology data been examined from an evolutionary perspective, our knowledge, there never phylogenetic analysis sensitivity, despite fact that doing so would provide insights into patterns sensitivity among...
Recent discoveries have documented evolutionary responses to freshwater salinization. We investigated if salinization exhibit life-history trade-offs or they can mitigate ecological impacts such as cascading effects through mechanisms of tolerance and cross-tolerance. conducted an outdoor mesocosm experiment using populations Daphnia pulex —a ubiquitous algal grazer—that were either naive had previously experienced selection become more tolerant sodium chloride (NaCl). During the initial...
As global pesticide use increases, the ability to rapidly respond pesticides by increasing tolerance has important implications for persistence of nontarget organisms. A recent study larval amphibians discovered that increased can be induced an early exposure low concentrations a pesticide. Since natural systems are often exposed variety vary in mode action, we need know whether induction one confers other pesticides. Using wood frogs (Lithobates sylvaticus), investigated insecticide...
Abstract Because ecosystems throughout the globe are contaminated with pesticides, there is a need to understand how natural populations cope pesticides and implications for ecological interactions. From an evolutionary perspective, evidence that pesticide tolerance can be achieved via two mechanisms: selection constitutive over multiple generations or by inducing within single generation phenotypic plasticity. While both mechanisms allow organisms persist in environments, they might result...
Researchers have developed numerous per- and polyfluoroalkyl substances (PFAS)-free aqueous film-forming foam (AFFF) formulations to replace PFAS-containing AFFF used for fire suppression. As part of the Department Defense's Strategic Environmental Research Development Program (SERDP), we examined direct lethal effects seven PFAS-free a on 14 aquatic species using series concentration (LC50) tests. We assessed LC10, LC50, LC90 values log–logistic logit analyses. Across all tested, discovered...
Abstract Aqueous film forming foams (AFFF) containing per- and polyfluoroalkyl substances (PFAS) have been used extensively for decades to rapidly extinguish hydrocarbon fires. Given PFAS persistence, propensity bioaccumulate, potential wildlife human health risks, focus has shifted developing fluorine-free foam (F3) alternatives. However, the toxicity of these alternatives is largely unknown. We assessed F3 gray treefrogs using both laboratory outdoor mesocosm studies. Overall, were...
Abstract The presence or absence of social counterparts can be instrumental in shaping both individual and collective behaviors. Furthermore, factors the environment may safeguard individuals from environmental stressors. In study reported here, we tested effects moving into a new habitat on mean, variance, repeatability behavioral tendencies between two contexts (isolated vs. group). Using arid spider, Stegodyphus dumicola (Araneae: Eresidae), whether individuals' boldness was influenced by...
Abstract As the numbers of chemical contaminants in freshwater ecosystems increase, it is important to understand whether interact ecologically ways. The present study investigated independent and interactive effects 2 that frequently co‐occur environments among higher latitudes, including a commonly applied insecticide (carbaryl) road salt (NaCl). hypothesis was addition either contaminant would result decline zooplankton, an algal bloom, subsequent both periphyton consumers. Another...
Pesticide use has led to the ubiquitous contamination of natural habitats, which inadvertently increased pesticide tolerance in target and nontarget species. Historically, been attributed selection for among individuals affected populations. Recent research, however, discovered that can be through phenotypic plasticity. Although induced may benefit organisms experiencing contaminated systems, little is known about its occurrence vertebrates, retention ontogeny, or potential life history...
Amphibian declines have been linked to numerous factors, including pesticide use and the fungal pathogen Batrachochytrium dendrobatidis (Bd). Moreover, research has suggested a link between amphibian sensitivity Bd exposure. We simultaneously exposed postmetamorphic American toads (Anaxyrus americanus), western (A. boreas), spring peepers (Pseudacris crucifer), Pacific treefrogs (P. regilla), leopard frogs (Lithobates pipiens), Cascades (Rana cascadae) factorial combination of two treatments...
Human modification of landscapes has substantially altered the quality and quantity terrestrial subsidies to freshwater ecosystems. The same modifications frequently lead addition chemical contaminants environments. Both types environmental change can alter abundance species ecological interactions that affect entire communities. We examined how variation tree litter inputs interacts with road salt deicers, which are an increasingly common contaminant in northern latitudes. Based on studies...