A5080846350- Fish Ecology and Management Studies
- Soil and Water Nutrient Dynamics
- Freshwater macroinvertebrate diversity and ecology
- Coastal wetland ecosystem dynamics
- Hydrology and Watershed Management Studies
- Wildlife-Road Interactions and Conservation
- Species Distribution and Climate Change
- Criminal Justice and Corrections Analysis
- Nanoparticles: synthesis and applications
- Aquatic Ecosystems and Phytoplankton Dynamics
- Isotope Analysis in Ecology
- Aquatic Invertebrate Ecology and Behavior
- Ecology and Vegetation Dynamics Studies
- Marine and coastal plant biology
- Peatlands and Wetlands Ecology
- Wind Energy Research and Development
- Water Quality and Pollution Assessment
- Energy Load and Power Forecasting
- Pharmaceutical and Antibiotic Environmental Impacts
- Hydrology and Sediment Transport Processes
- Marine and fisheries research
- Marine Biology and Ecology Research
- Law, Rights, and Freedoms
- Coastal and Marine Dynamics
- Wildlife Ecology and Conservation
Baylor University
2014-2024
Aquatic Systems (United States)
2013-2024
National Renewable Energy Laboratory
2020-2024
Duke University
1999-2023
The Ohio State University
2023
Sanofi (United States)
2022
John Wiley & Sons (United States)
2016-2020
Ecological Society of America
2016-2020
Rocky Mountain Research (United States)
2018
Rocky Mountain Research Station
2018
1. Existing methods for identifying ecological community thresholds are designed univariate indicators or multivariate dimension-reduction of structure. Most insensitive to responses individual taxa with low occurrence frequencies highly variable abundances, properties the vast majority in data sets. We introduce Threshold Indicator Taxa ANalysis (TITAN) detect changes distributions along an environmental gradient over space time, and assess synchrony among change points as evidence...
Watershed land cover is widely used as a predictor of stream-ecosystem condition. However, numerous spatial factors can confound the interpretation correlative analyses between and stream indicators, particularly at broad scales. We stream-monitoring data set collected from Coastal Plain Maryland, USA to address analytical challenges presented by (1) collinearity land-cover class percentages, (2) autocorrelation data, (3) intercorrelations among within abiotic intermediaries that link biota,...
Surface coal mining is the dominant form of land cover change in Central Appalachia, yet extent to which surface mine runoff polluting regional rivers currently unknown. We mapped from 1976 2005 for a 19,581 km(2) area southern West Virginia and linked these maps with water quality biological data 223 streams. The within catchments highly correlated ionic strength sulfate concentrations receiving Generalized additive models were used estimate amount watershed mining, stream strength, or...
Nonlinear ecological responses to anthropogenic forcing are common, and in some cases, the ecosystem responds by assuming a new stable state. This article is an overview serves as introduction several articles this BRIDGES cluster that directed toward managers interested dealing with nonlinear freshwaters, particularly streams. A threshold or breakpoint occurs where system rapidly relatively small change driver. The existence of can signal configuration alternative state, although such does...
Novel physical and chemical conditions of many modern ecosystems increasingly diverge from the environments known to have existed at any time in history Earth. The loss natural land urbanization is one most prevalent drivers novel freshwaters. However, current understanding aquatic community response based heavily upon aggregate indicators structure linear or wedge-shaped models that challenge ecological theory. We applied a new analytical method, threshold indicator taxa analysis (TITAN),...
The goal of this paper is to help managers better understand implications using aggregate community metrics, such as taxon richness or Indices Biotic Integrity (IBI), for detecting threshold responses anthropogenic environmental gradients. To illustrate, we offer an alternative analytical approach, Threshold Indicator Taxa ANalysis (TITAN), geared toward identifying synchronous changes in the distribution multiple taxa evidence ecological threshold. Our approach underscores fundamental...
Eutrophication has become one of the most widespread anthropogenic forces impacting freshwater biological diversity. One potentially important mechanism driving biodiversity changes in response to eutrophication is alteration seasonal patterns succession, particularly among species with short, synchronous, life cycles. We tested hypothesis that reduces seasonally driven variation assemblages by focusing on an understudied aspect biodiversity: temporal beta diversity (βt ). estimated effect...
Methods for wetland bioassessment using macroinvertebrates are not well developed. Two of the most controversial issues in stream bioassessment, subsampling and taxonomic resolution, have yet to be quantitatively addressed wetlands. Using a multivariate approach, we evaluated efficacy family-, genus-, species-level assemblage data reflecting environment distinguishing impaired sites from reference condition. We used 5 basic levels (100-, 200-, 300-organism fixed counts; 10% 25% areas), an...
As the "war on drugs" enters latter half of its third decade since being forged into American lexicon by President Ronald Reagan, public has grown more skeptical current strategy and proven to be receptive a broader consideration alternatives incarceration. This been case most notably with marijuana offenses, where policy discussion shifted in some localities one decriminalization or de-prioritizing law enforcement resources dedicated pursuing possession offenses. Despite increased profile...
Coupled production between algae and bacteria in stream epilithon was assessed along a nutrient-enrichment gradient 8 Texas streams with open canopies. Photosynthesis (PS) bacterial biomass (BBP) were measured simultaneously using dual-label radioassay (14C-HCO3– uptake 3H-L-leucine incorporation into protein) on multiple samples within reach. PS BBP after light (1200–1500 μmol m−2 s−1) dark incubations. The degree of coupled estimated as the covariation (i.e., correlation or covariance)...
A factorial study was conducted to evaluate the phytotoxicity of copper oxide nanoparticles (nCuO, 0.1–100 mg/L), arsenic (As, 0 and 10 mg/kg), their interaction rice plants (Oryza sativa japonica 'Koshihikari') during life cycle. No significant effect observed on seed germination. The main effects nCuO As were lengths biomasses seedling shoots roots root branching. between also significantly influenced these parameters. addition increased Cu uptake in seedlings generally improved growth....
The Florida Everglades, a wetland of international importance, has been undergoing significant shift in its native flora and fauna due to excessive total phosphorus (TP) loadings (an average 147 t per annum from 1995 2004) an elevated mean TP concentration (69 µg L−1 agricultural runoff Lake Okeechobee outflow despite the use 16000 ha stormwater treatment areas. Here, we present Bayesian changepoint analysis long-term experimental research show that exceeding surface water geometric...
Cuffney and Qian (2013) performed numerous simulations to demonstrate potential flaws in Threshold Indicator Taxa Analysis (TITAN), a method for interpreting taxon contributions community change along novel environmental gradients. Based on their simulations, they concluded that: 1) TITAN is not an effective detecting different types of statistical thresholds trend lines, 2) permutation results highly significant p-values even splits that are thresholds, 3) coincident points may arise as...
Summary Anthropogenic inputs of nitrogen ( N ) and phosphorus P create environmental conditions that alter biological organisation ecosystem functioning in fresh waters. We studied 38 wadeable streams spanning a gradient to contrast responses algal fish assemblages nutrient enrichment. Surface water total TP TN concentrations represented wide range : 7–2380 μg L −1 ; 127–15 860 were correlated across our study sites. Total explained significantly more variance periphyton carbon C...
C, N, and P content were measured across the ontogeny of lotic aquatic insects representing a diversity life-history characteristics. The relationship between individual mass nutrient was used to show ontogenetic patterns by species. Species analyzed for C N exhibited quasihomeostatic pattern ontogeny. Percent %N varied among taxa irrespective ontogeny, with %C ranging from 47.4 56.2% 9.6 11.6%. also species but declined nonlinearly best represented power function. >7% in 1st-instar Tabanus...
Trace metals associated with nanoparticles are known to possess reactivities that different from their larger-size counterparts. However, the relative importance of small large particles for overall distribution and biouptake these is not as well studied in complex environmental systems. Here, we have examined differences long term fate transport ceria (CeO2) two sizes (3.8 vs 185 nm), dosed weekly freshwater wetland mesocosms over 9 months. While majority CeO2 were detected soils sediments...