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Husk B, Julian P, Simon D, Tromas N, Phan D, Painter K, Baulch H, Sauvé S. Improving water quality in a hypereutrophic lake and tributary through agricultural nutrient mitigation: A Multi-year monitoring analysis. J Environ Manage 2024; 354:120411. [PMID: 38382438 DOI: 10.1016/j.jenvman.2024.120411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 02/05/2024] [Accepted: 02/15/2024] [Indexed: 02/23/2024]
Abstract
Anthropogenic eutrophication remains a critical global issue, significantly impacting surface water quality. Numerous regions have implemented beneficial management practices to combat agricultural nonpoint pollution, often evaluating efficacy at the field scale, but not downstream. In this study, we conducted an extensive, 11-year (2010-2020), all-season, weekly monitoring program in a small, shallow, hypereutrophic lake and main tributary located in a cold climate, northern temperate zone, within a predominantly agricultural-forested mesoscale watershed. The monitoring took place before and after the implementation of field-scale agricultural nutrient mitigation measures in the catchment, allowing assessment of changes over time in the downstream tributary and lake. We analyzed long-term trends and temporal change points for nitrogen and phosphorus concentrations, aquatic trophic status, and nutrient stoichiometric ratios. The results revealed significant reductions in nitrogen and phosphorus concentrations, improved lake trophic status from hypereutrophic to eutrophic, and an increase in total nitrogen : total phosphorus ratios following the implementation of field-scale agricultural nutrient mitigation measures. Notably, both the lake and its main tributary exhibited significant temporal change points for these parameters. Our findings offer evidence of a relatively rapid, positive effect of the implementation of field-scale agricultural nutrient mitigation measures contributing to subsequent improvements in downstream water quality.
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Affiliation(s)
- Barry Husk
- BlueLeaf Inc., 310, rue Chapleau, Drummondville, Québec, J2B 5E9, Canada.
| | - Paul Julian
- Université de Montréal, Département de chimie, 2900, rue Édouard-Montpetit, Montréal, Québec H3C 3J7, Canada.
| | - Dana Simon
- Université de Montréal, Département de chimie, 2900, rue Édouard-Montpetit, Montréal, Québec H3C 3J7, Canada.
| | - Nicolas Tromas
- McGill University, 740, avenue du Docteur-Penfield, Montréal, Québec H3A 0G1, Canada.
| | - Dawson Phan
- Ohio State University, Department of Microbiology, 105 Biological Sciences Building, 484 West 12th Avenue, Columbus, OH 43210, USA.
| | - Kristin Painter
- University of Saskatchewan, School of Environment and Sustainability, Global Institute for Water Security, 11 Innovation Place, Saskatoon, Saskatchewan S7N 3H5, Canada.
| | - Helen Baulch
- University of Saskatchewan, School of Environment and Sustainability, Global Institute for Water Security, 11 Innovation Place, Saskatoon, Saskatchewan S7N 3H5, Canada.
| | - Sébastien Sauvé
- Université de Montréal, Département de chimie, 2900, rue Édouard-Montpetit, Montréal, Québec H3C 3J7, Canada.
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Julian P, Gerber S, Bhomia RK, King J, Osborne TZ, Wright AL. Understanding stoichiometric mechanisms of nutrient retention in wetland macrophytes: stoichiometric homeostasis along a nutrient gradient in a subtropical wetland. Oecologia 2020; 193:969-980. [PMID: 32725299 DOI: 10.1007/s00442-020-04722-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Accepted: 07/23/2020] [Indexed: 11/28/2022]
Abstract
Nutrient homeostasis relates ambient stoichiometric conditions in an environment to the stoichiometry of living entities of that ecosystem. Plant nutrient sequestration in wetland ecosystems is a key process for downstream water quality. However, few studies have examined stoichiometric homeostasis of aquatic vegetation despite the importance of stoichiometry to plant nutrient uptake efficiency. This study investigated stoichiometric homeostasis of dominant emergent and submerged aquatic vegetation (EAV and SAV, respectively) within two treatment flow-ways of Everglades Stormwater Treatment Area 2 (STA-2). These flow-ways encompass a large gradient in plant nutrient availability. This study hypothesizes that wetland vegetation is homeostatic relative to ambient nutrients and consequently nutrient resorption does not vary along the nutrient gradient. We developed a framework to investigate how vegetation uptake and resorption of nutrients contribute separately to homeostasis. Overall, we determined that the wetland vegetation in this study was non-homeostatic with respect to differential uptake of nitrogen (N) versus phosphorus (P). In EAV, P resorption was relatively high and N resorption was moderate, and resorption efficiency did not vary significantly along the gradient. In separating the proportional contribution of resorption and uptake to the degree of homeostasis, resorption did not affect overall homeostatic status in EAV.
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Affiliation(s)
- Paul Julian
- Soil and Water Sciences Department, University of Florida, Ft. Pierce, FL, 34945, USA.
| | - Stefan Gerber
- Soil and Water Sciences Department, University of Florida, Gainesville, FL, 32611, USA
| | - Rupesh K Bhomia
- Soil and Water Sciences Department, University of Florida, Gainesville, FL, 32611, USA
| | - Jill King
- South Florida Water Management District, Water Quality Treatment Technologies, West Palm Beach, FL, 33406, USA
| | - Todd Z Osborne
- Soil and Water Sciences Department, University of Florida, Gainesville, FL, 32611, USA.,Whitney Laboratory for Marine Bioscience, University of Florida, St Augustine, FL, 32080, USA
| | - Alan L Wright
- Soil and Water Sciences Department, University of Florida, Ft. Pierce, FL, 34945, USA
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Kominoski JS, Gaiser EE, Castañeda-Moya E, Davis SE, Dessu SB, Julian P, Lee DY, Marazzi L, Rivera-Monroy VH, Sola A, Stingl U, Stumpf S, Surratt D, Travieso R, Troxler TG. Disturbance legacies increase and synchronize nutrient concentrations and bacterial productivity in coastal ecosystems. Ecology 2020; 101:e02988. [PMID: 31958144 PMCID: PMC7317527 DOI: 10.1002/ecy.2988] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/10/2019] [Revised: 11/27/2019] [Accepted: 12/20/2019] [Indexed: 11/12/2022]
Abstract
Long‐term ecological research can resolve effects of disturbance on ecosystem dynamics by capturing the scale of disturbance and interactions with environmental changes. To quantify how disturbances interact with long‐term directional changes (sea‐level rise, freshwater restoration), we studied 17 yr of monthly dissolved organic carbon (DOC), total nitrogen (TN), and phosphorus (TP) concentrations and bacterioplankton productivity across freshwater‐to‐marine estuary gradients exposed to multiple disturbance events (e.g., droughts, fire, hurricanes, and low‐temperature anomalies) and long‐term increases in water levels. By studying two neighboring drainages that differ in hydrologic connectivity, we additionally tested how disturbance legacies are shaped by hydrologic connectivity. We predicted that disturbance events would interact with long‐term increases in water levels in freshwater and marine ecosystems to increase spatiotemporal similarity (i.e., synchrony) of organic matter, nutrients, and microbial activities. Wetlands along the larger, deeper, and tidally influenced Shark River Slough (SRS) drainage had higher and more variable DOC, TN, and TP concentrations than wetlands along the smaller, shallower, tidally restricted Taylor River Slough/Panhandle (TS/Ph) drainage. Along SRS, DOC concentrations declined with proximity to coast, and increased in magnitude and variability following drought and flooding in 2015 and a hurricane in 2017. Along TS/Ph, DOC concentrations varied by site (higher in marine than freshwater wetlands) but not year. In both drainages, increases in TN from upstream freshwater marshes occurred following fire in 2008 and droughts in 2010 and 2015, whereas downstream increases in TP occurred with coastal storm surge from hurricanes in 2005 and 2017. Decreases in DOC:TN and DOC:TP were explained by increased TN and TP. Increases in bacterioplankton productivity occurred throughout both drainages following low‐temperature events (2010 and 2011) and a hurricane (2017). Long‐term TN and TP concentrations and bacterioplankton productivity were correlated (r > 0.5) across a range of sampling distances (1–50 km), indicating spatiotemporal synchrony. DOC concentrations were not synchronized across space or time. Our study advances disturbance ecology theory by illustrating how disturbance events interact with long‐term environmental changes and hydrologic connectivity to determine the magnitude and extent of disturbance legacies. Understanding disturbance legacies will enhance prediction and enable more effective management of rapidly changing ecosystems.
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Affiliation(s)
- John S Kominoski
- Department of Biological Sciences & Institute of Environment/Southeast Environmental Research Center, Florida International University, Miami, Florida, 33199, USA
| | - Evelyn E Gaiser
- Department of Biological Sciences & Institute of Environment/Southeast Environmental Research Center, Florida International University, Miami, Florida, 33199, USA
| | - Edward Castañeda-Moya
- Department of Biological Sciences & Institute of Environment/Southeast Environmental Research Center, Florida International University, Miami, Florida, 33199, USA
| | | | - Shimelis B Dessu
- Department of Earth and Environment & Institute of Environment/Southeast Environmental Research Center, Florida International University, Miami, Florida, 33199, USA
| | - Paul Julian
- Whitney Laboratory for Marine Bioscience, University of Florida, Gainesville, Florida, 32611, USA
| | - Dong Yoon Lee
- Department of Biological Sciences & Institute of Environment/Southeast Environmental Research Center, Florida International University, Miami, Florida, 33199, USA
| | - Luca Marazzi
- Department of Biological Sciences & Institute of Environment/Southeast Environmental Research Center, Florida International University, Miami, Florida, 33199, USA
| | - Victor H Rivera-Monroy
- Department of Oceanography and Coastal Sciences, College of the Coast and the Environment, Louisiana State University, Baton Rouge, Louisiana, 70803, USA
| | - Andres Sola
- Department of Biological Sciences & Institute of Environment/Southeast Environmental Research Center, Florida International University, Miami, Florida, 33199, USA
| | - Ulrich Stingl
- Institute of Food and Agricultural Sciences, University of Florida, Davie, Florida, 33314, USA
| | - Sandro Stumpf
- Department of Biological Sciences & Institute of Environment/Southeast Environmental Research Center, Florida International University, Miami, Florida, 33199, USA
| | | | - Rafael Travieso
- Department of Biological Sciences & Institute of Environment/Southeast Environmental Research Center, Florida International University, Miami, Florida, 33199, USA
| | - Tiffany G Troxler
- Department of Biological Sciences & Institute of Environment/Southeast Environmental Research Center, Florida International University, Miami, Florida, 33199, USA
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Julian P. Spatial Ecology and Conservation Modeling. Applications with R. Robert Fletcher, Marie-Josée Fortin. Springer Nature, Switzerland, 2018. xviii + 523 pp. Price AUD $365.99 (hardcover; also available as an Ebook). AUSTRAL ECOL 2019. [DOI: 10.1111/aec.12791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Paul Julian
- Whitney Laboratory for Marine Bioscience; University of Florida; 9505 N Ocean Shore Blvd St. Augustine Florida 32080 USA
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Carey JC, Jankowski K, Julian P, Sethna LR, Thomas PK, Rohweder J. Exploring Silica Stoichiometry on a Large Floodplain Riverscape. Front Ecol Evol 2019. [DOI: 10.3389/fevo.2019.00346] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Browne J, Edwards AN, Penn DL, Meyer-Kalos PS, Gottlieb JD, Julian P, Ludwig K, Mueser KT, Kane JM. Factor structure of therapist fidelity to individual resiliency training in the Recovery After an Initial Schizophrenia Episode Early Treatment Program. Early Interv Psychiatry 2018; 12:1052-1063. [PMID: 27860369 DOI: 10.1111/eip.12409] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Revised: 07/28/2016] [Accepted: 09/20/2016] [Indexed: 10/20/2022]
Abstract
BACKGROUND Evidence-based approaches and early intervention have improved the long-term prognosis of individuals with schizophrenia. However, little is known about the therapeutic processes involved in individual therapy in first-episode psychosis. A comprehensive psychosocial/psychiatric programme for this population, NAVIGATE, includes an individual therapy component, individual resiliency training (IRT). Fidelity of clinicians' adherence to the IRT protocol has been collected to ensure proper implementation of this manual-based intervention. These data can provide insight into the elements of the therapeutic process in this intervention. MATERIALS AND METHODS To achieve this goal, we first examined the factor structure of the IRT fidelity scale with exploratory factor analysis. Second, we explored the relationships among the IRT fidelity ratings with clinician years of experience and years of education, as well as client's baseline symptom severity and duration of untreated psychosis. RESULTS AND CONCLUSIONS Results supported a 2-factor structure of the IRT fidelity scale. Correlations between clinician years of education and fidelity ratings were statistically significant.
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Affiliation(s)
- Julia Browne
- Department of Psychology and Neuroscience, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Alexandra N Edwards
- Department of Psychology and Neuroscience, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - David L Penn
- Department of Psychology and Neuroscience, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.,School of Psychology, Australian Catholic University, Melbourne, Victoria, Australia
| | - Piper S Meyer-Kalos
- Minnesota Center for Chemical and Mental Health, School of Social Work, University of Minnesota, St. Paul, Minnesota
| | - Jennifer D Gottlieb
- Center for Psychiatric Rehabilitation, Departments of Occupational Therapy, Psychology, & Psychiatry, Boston University, Boston, Massachusetts
| | - Paul Julian
- Department of Psychology and Neuroscience, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Kelsey Ludwig
- Department of Psychology and Neuroscience, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Kim T Mueser
- Center for Psychiatric Rehabilitation, Departments of Occupational Therapy, Psychology, & Psychiatry, Boston University, Boston, Massachusetts
| | - John M Kane
- Division of Psychiatry Research, Zucker Hillside Hospital, North Shore-Long Island Jewish Health System, New York, New York
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Julian P, Osborne TZ. From lake to estuary, the tale of two waters: a study of aquatic continuum biogeochemistry. Environ Monit Assess 2018; 190:96. [PMID: 29372426 DOI: 10.1007/s10661-017-6455-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Accepted: 12/28/2017] [Indexed: 06/07/2023]
Abstract
The balance of fresh and saline water is essential to estuarine ecosystem function. Along the fresh-brackish-saline water gradient within the C-43 canal/Caloosahatchee River Estuary (CRE), the quantity, timing and distribution of water, and associated water quality significantly influence ecosystem function. Long-term trends of water quality and quantity were assessed from Lake Okeechobee to the CRE between May 1978 and April 2016. Significant changes to monthly flow volumes were detected between the lake and the estuary which correspond to changes in upstream management. and climatic events. Across the 37-year period, total phosphorus (TP) flow-weighted mean (FWM) concentration significantly increased at the lake; meanwhile, total nitrogen (TN) FMW concentrations significantly declined at both the lake and estuary headwaters. Between May 1999 and April 2016, TN, TP, and total organic carbon (TOC), ortho-P, and ammonium conditions were assessed within the estuary at several monitoring locations. Generally, nutrient concentrations decreased from upstream to downstream with shifts in TN/TP from values > 20 in the freshwater portion, ~ 20 in the estuarine portion, and < 20 in the marine portion indicating a spatial shift in nutrient limitations along the continuum. Aquatic productivity analysis suggests that the estuary is net heterotrophic with productivity being negatively influenced by TP, TN, and TOC likely due to a combination of effects including shading by high color dissolved organic matter. We conclude that rainfall patterns, land use, and the resulting discharges of runoff drive the ecology of the C-43/CRE aquatic continuum and associated biogeochemistry rather than water management associated with Lake Okeechobee.
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Affiliation(s)
- Paul Julian
- Soil and Water Sciences, University of Florida, 2199 South Rock Rd, Ft. Pierce, FL, 34945, USA.
| | - Todd Z Osborne
- Soil and Water Sciences, University of Florida, Gainesville, FL, 32611, USA
- Whitney Laboratory for Marine Bioscience, University of Florida, St. Augustine, FL, 32080, USA
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Abstract
This study evaluated the degree of sediment contamination in several South Florida estuaries. During the 2010 National Condition Assessment, Florida Fish and Wildlife Research Institute collected water column, sediment and biotic data from estuaries across the entire state of Florida. Sediments were analyzed for arsenic, cadmium, chromium, lead, mercury, zinc and total polychlorinated biphenyls and were compared relative to empirically derived sediment quality guidelines. As a result of this data collection and assessment effort, it was determined that the degree of contamination with respect to sediment was low for all southern Florida estuaries assessed, except the Miami River which was determined to be considerably contaminated. However only one monitoring location was used to assess the Miami River, and as such should be viewed with caution. A low degree of contamination was determined for Biscayne Bay sediments, possibly indicating a recovery from its previously reported higher contaminant level.
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Affiliation(s)
- Paul Julian
- Florida Department of Environmental Protection, Office of Ecosystem Projects, 2295 Victoria Ave, Ft Myers, FL, 33902, USA,
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Julian P, Gu B. Mercury accumulation in largemouth bass (Micropterus salmoides Lacépède) within marsh ecosystems of the Florida Everglades, USA. Ecotoxicology 2015; 24:202-14. [PMID: 25336046 DOI: 10.1007/s10646-014-1373-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 10/13/2014] [Indexed: 05/17/2023]
Abstract
This study evaluates factors, particularly water quality related, that may influence mercury (Hg) bioaccumulation in largemouth bass (LMB, Micropterus salmoides Lacépède) within the Everglades marshes of South Florida. The investigation is an empirical analysis of ambient data from both long-term fish monitoring and marsh water quality monitoring sites across the Everglades Protection Area. Previous Hg studies of Everglade's marsh biota have focused on the role that sulfate plays in Hg bioaccumulation. While sulfate can be important under some environmental conditions, this empirical analysis in Everglades marshes showed that sulfate has little association with Hg concentrations in LMB. It is suggested that other water quality variables including water pH, alkalinity and specific conductance may have as much or more influence in the accumulation of Hg in LMB. Furthermore, tissue Hg concentration normalized to body-weight and age-specific growth rates were significantly correlated with Water Conservation Area (WCA)-1, WCA-2 and Everglades National Park (ENP) but not WCA-3. However, body condition was correlated negatively with Hg concentration only within WCA-2, WCA-3 and ENP; the relationship was not significant within WCA-1. This disparity between Hg concentration and body condition could be attributed to ecological effects including water quality and quantity conditions within each compartment of the system that are significant driving forces for biota abundance, trophic structure and distribution within the Everglades ecosystem. While water quality and quantity are important, trophic position of LMB has the potential to influence Hg accumulation dynamics. In spite of documented biogeochemical linkages to Hg accumulation, this empirical analysis did not demonstrate enough quantitative interaction to be useful for Hg management in the Everglades ecosystem.
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Affiliation(s)
- Paul Julian
- Florida Department of Environmental Protection, Office of Ecosystem Projects, 2295 Vicotira Avenue, Fort Myers, FL, 33902, USA,
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Julian P, Gu B, Redfield G. Comment on and reinterpretation of Gabriel et Al. (2014) 'fish mercury and surface water sulfate relationships in the everglades protection area'. Environ Manage 2015; 55:1-5. [PMID: 25248934 DOI: 10.1007/s00267-014-0377-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Accepted: 09/16/2014] [Indexed: 06/03/2023]
Abstract
Mercury (Hg) methylation and bioaccumulation is a major environmental issue in the Everglades Protection Area (EvPA). Therefore, it is critical to improve our predictive understanding of Hg dynamics. This commentary critically reviews a recently published manuscript concerning the possible relationship between Hg in fish tissue and surface water sulfate within EvPA marshes. The commentary addresses fundamental issues with the authors' data analysis, results and interpretation as well as highlights inconsistencies with published literature and the lack of support for their suggested ecosystem management actions. A number of chemical, biological, and physical factors influence Hg methylation and bioaccumulation, and water sulfate is sometimes viewed as a keystone factor, Gabriel et al. (2014) conclude that Hg bioaccumulation is favored at elevated sulfate concentrations, and suggest mitigation strategies to reduce sulfate inputs to the EvPA. A careful review of their data and conclusions reveals major flaws and in fact, a more straightforward and defensible interpretation of their data would be that no predictable relationship exists between fish tissue Hg and surface water sulfate concentrations in south Florida. Given the complexity of Hg cycling and the influence of trophic and habitat characteristics on aquatic consumer Hg accumulation, expecting one parameter to predict Hg accumulation dynamics within fish species within a dynamic marsh environment is unrealistic. Furthermore, proposing any management guidance from this relationship with little to no quantitative statistical analysis is inappropriate and misleading.
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Affiliation(s)
- Paul Julian
- Office of Ecosystem Projects, Florida Department of Environmental Protection, 2295 Victoria Ave, Fort Myers, FL, 33902, USA,
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Julian P. Reply to "Mercury Bioaccumulation and Bioaccumulation Factors for Everglades Mosquitofish as Related to Sulfate: A Re-Analysis of Julian II (2013)". Bull Environ Contam Toxicol 2014; 93:517-521. [PMID: 25266044 DOI: 10.1007/s00128-014-1389-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Accepted: 09/18/2014] [Indexed: 06/03/2023]
Affiliation(s)
- Paul Julian
- Office of Ecosystem Projects, Florida Department of Environmental Protection, 2295 Victoria Avenue, Fort Myers, FL, 33902-2549, USA,
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Julian P. Mercury bio-concentration factor in mosquito fish (Gambusia spp.) in the Florida Everglades. Bull Environ Contam Toxicol 2013; 90:329-332. [PMID: 23269441 DOI: 10.1007/s00128-012-0939-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2012] [Accepted: 12/14/2012] [Indexed: 06/01/2023]
Abstract
The aim of this study was to evaluate Gambusia spp. (mosquito-fish) mercury bio-concentration factor in relation to marsh surface water sulfate concentration. As part of the everglades regional environmental monitoring and assessment marsh biogeochemical parameters were collected by the US Environmental Protection agency between 1995 and 2005 within the Everglades Protection Area and Everglades National Park (ENP). Surface water sulfate and methyl-mercury concentration data in combination with mosquito-fish total mercury concentration data was used to elucidate the gambusia mercury bio-concentration and surface water sulfate relationship. Previous studies hypothesized that the relationship of biota mercury and surface water sulfate concentrations is unimodal. However this study shows that the relationship of biota mercury and sulfate surface water concentrations in mosquito-fish adheres closely with a log-log relationship. Furthermore mosquito-fish bio-concentration factor were similar for Water Conservation Area (WCA) 1 and WCA2, while WCA3 and ENP were significantly different between all pairs throughout the study period. This difference in hypothesized relationships versus the relationship defined in this study could be the result of life span (extent of exposure) or life history of mosquito-fish.
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Affiliation(s)
- Paul Julian
- Department of Environmental Protection, Office of Ecosystem Projects, 3900 Commonwealth Blvd, Tallahassee, FL 32399-3000, USA.
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Julian P, Everham EM, Main MB. Influence of a Large-scale Removal of an Invasive Plant (Melaleuca quinquenervia) on Home-range Size and Habitat Selection by Female Florida Panthers (Puma concolor coryi) within Big Cypress National Preserve, Florida. SOUTHEAST NAT 2012. [DOI: 10.1656/058.011.0215] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Niccola L, Mehta N, Julian P, Bilinski A, Sosa L, Meek J, Hariri S, Markowitz L, Hadler J. P1-S6.43 HPV vaccine coverage among high-risk women: racial and socioeconomic disparities and barriers. Br J Vener Dis 2011. [DOI: 10.1136/sextrans-2011-050108.267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Idriz S, Bishara S, Kirkham A, Rickards D, Julian P, Shah R, Malone-Lee J. The comparative pressure-flow plot properties of radiological bladder neck and prostatic obstruction. BJU Int 2009; 104:1670-5. [PMID: 19515178 DOI: 10.1111/j.1464-410x.2009.08679.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVES To test the hypotheses that: (i) significant differences should exist in pressure/flow data between radiologically determined bladder neck and prostatic obstruction; (ii) these differences should inform understanding of the pathophysiology of male outflow obstruction. The biomechanics of the voiding/pressure/flow plot imply that a urodynamic assessment trace should identify outflow obstruction and characterise the urethral viscoelastic properties. Micturating cystourethrograms (MCUG) images might provide a useful diagnostic dichotomy for testing these assumptions. MATERIALS AND METHODS The pressure/flow data from 71 men who also provided video-urodynamic imaging data that a radiologist could classify unequivocally as showing bladder neck obstruction (42) or prostatic obstruction (29) were analysed. The following variables were recorded: the detrusor pressure at initiation of voiding (P(det.open)); the detrusor pressure at the end of voiding (P(det.close)); the detrusor pressure at maximum flow rate (Q(max)), (P(det.)Q(max)), and Q(max). The urethral resistance relation (URR) was drawn onto the pressure-flow plot and the gradient of the URR, DeltaP(det)/DeltaQ, was calculated. RESULTS There were significant between group differences in P(det.open) (95% confidence interval of the difference 5.2-28.6, U = 352, P = 0.003); P(det.close) (0.2-15.0, U = 428, P = 0.034); P(det).Q(max) (0.0-18.9, U = 439, P = 0.05); Q(max) and DeltaP(det)/DeltaQ did not distinguish between the MCUG groups (95% confidence interval of the difference 2.3-18, U = 111; P = 0.004). The best-fit model from linear combinations of the data achieved an area under the receiver operator curve of 0.72 for discriminating between the MCUG groups. CONCLUSIONS The urodynamic assessment identified interesting and coherent biomechanical differences, and could distinguish between the obstructions with a moderate degree of accuracy.
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Affiliation(s)
- Sanjin Idriz
- Department of Surgery, University College Hospital, London, UK
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Dogaru R, Julian P, Chua LO, Glesner M. The simplicial neural cell and its mixed-signal circuit implementation: an efficient neural-network architecture for intelligent signal processing in portable multimedia applications. ACTA ACUST UNITED AC 2008; 13:995-1008. [PMID: 18244494 DOI: 10.1109/tnn.2002.1021899] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
This paper introduces a novel neural architecture which is capable of similar performance to any of the "classic" neural paradigms while having a very simple and efficient mixed-signal implementation which makes it a valuable candidate for intelligent signal processing in portable multimedia applications. The architecture and its realization circuit are described and the functional capabilities of the novel neural architecture called a simplicial neural cell are demonstrated for both regression and classification problems including nonlinear image filtering.
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Affiliation(s)
- R Dogaru
- Dept. of Appl. Electron. and Inf. Eng., Politehnic Inst. of Bucharest, Romania
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Almonte M, Kitchener H, Desai M, Sargent A, Bailey A, Turner A, Thomson C, Julian P. O-2 Preliminary results of the ARTISTIC study: a randomised trial in screening to improve cytology. Cytopathology 2007. [DOI: 10.1111/j.1365-2303.2007.00500_2.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Fama J, Berryman D, Harger N, Julian P, Peterson N, Spinner M, Varney J. Inside outreach: a challenge for health sciences librarians. J Med Libr Assoc 2005; 93:327-37. [PMID: 16059422 PMCID: PMC1176229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2023] Open
Abstract
OBJECTIVE Like medical and health sciences libraries throughout the country, the Lamar Soutter Library (LSL) at the University of Massachusetts Medical School is dealing with ever-increasing outreach needs in times of diminishing funding. With the goal of reshaping the library's outreach program to better serve our patron groups, the Outreach Study Group was formed to investigate existing models of outreach. METHODS The group initially examined the current literature and subsequently conducted a nationwide survey of medical and health sciences libraries to identify trends in outreach. This article details the methods used for the survey, including establishing criteria for selecting participants, determining the focus, and developing and conducting the survey. RESULTS Of the 40 libraries invited to participate, 63% completed the survey. An analysis of the data revealed successes, problems, and trends. The group's conclusions led to recommendations for the LSL's future outreach efforts. CONCLUSIONS Analysis of the data revealed key findings in the areas of strategic planning, funding, and evaluation. A thoughtful definition of outreach ensures that outreach activities are expressions of the library's mission. Funding shifts require flexible programs. Evaluation provides data necessary to create new programs, sustain successful ones, and avoid repeating mistakes.
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Affiliation(s)
- Jane Fama
- Lamar Soutter Library University of Massachusetts Medical School 55 Lake Avenue North Worcester, Massachusetts 01655
| | - Donna Berryman
- Lamar Soutter Library University of Massachusetts Medical School 55 Lake Avenue North Worcester, Massachusetts 01655
| | - Nancy Harger
- Lamar Soutter Library University of Massachusetts Medical School 55 Lake Avenue North Worcester, Massachusetts 01655
| | - Paul Julian
- Lamar Soutter Library University of Massachusetts Medical School 55 Lake Avenue North Worcester, Massachusetts 01655
| | - Nancy Peterson
- Lamar Soutter Library University of Massachusetts Medical School 55 Lake Avenue North Worcester, Massachusetts 01655
| | - Margaret Spinner
- Lamar Soutter Library University of Massachusetts Medical School 55 Lake Avenue North Worcester, Massachusetts 01655
| | - Jennifer Varney
- Boston Library Consortium 700 Boylston Street, Room 317 Boston, Massachusetts 02117
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Foulk R, Genbacev O, Lu S, Julian P, Fisher S. Human blastocysts express the adhesion molecule, L-selectin, immediately after hatching. Fertil Steril 2002. [DOI: 10.1016/s0015-0282(02)03019-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Julian P, Desages A, D'Amico B. Orthonormal high-level canonical PWL functions with applications to model reduction. ACTA ACUST UNITED AC 2000. [DOI: 10.1109/81.847875] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Julian P, Desages A, Agamennoni O. High-level canonical piecewise linear representation using a simplicial partition. ACTA ACUST UNITED AC 1999. [DOI: 10.1109/81.754847] [Citation(s) in RCA: 168] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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McPhaden MJ, Busalacchi AJ, Cheney R, Donguy JR, Gage KS, Halpern D, Ji M, Julian P, Meyers G, Mitchum GT, Niiler PP, Picaut J, Reynolds RW, Smith N, Takeuchi K. The Tropical Ocean-Global Atmosphere observing system: A decade of progress. ACTA ACUST UNITED AC 1998. [DOI: 10.1029/97jc02906] [Citation(s) in RCA: 779] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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George J, Turner J, Cooke E, Hennessy E, Savage W, Julian P, Cochrane R. Women's knowledge of emergency contraception. Br J Gen Pract 1994; 44:451-4. [PMID: 7748633 PMCID: PMC1239018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
BACKGROUND More widespread use of emergency contraception could help to reduce the number of unwanted pregnancies. AIM The objective of this study was to assess women's knowledge of emergency contraception. METHOD A questionnaire was distributed to 1290 women aged between 16 and 50 years attending 14 general practice surgeries in London over a two-week period in 1990. RESULTS The response rate was 70%. Over three quarters of the women had heard of emergency contraception; these were mainly women who used contraception, who had higher educational qualifications or who were not Muslim. Women who were the most likely to need and to use emergency contraception--those using barrier methods--had no more accurate knowledge than women using any other method of contraception. Only 53% of barrier method users knew emergency contraception could be used as a backup when other methods failed. Only one fifth of women had heard about this method from their general practitioner or any other health professional, while half had obtained their information from the media. CONCLUSION These results suggest that including information on emergency contraception in consultations with users of barrier methods of contraception is a small step which general practitioners and practice nurses could take to increase the use of emergency contraception.
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Affiliation(s)
- J George
- Department of General Practice and Primary Care, Joint Medical College of St. Bartholomew's, London
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Toon PD, Fuller JHS, Julian P, Southgate LJ, Cooke ED, Naish J. Tomlinson report. West J Med 1993. [DOI: 10.1136/bmj.306.6869.62-b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Vaught LK, Stratton CJ, Julian P, Vaught WG, Sher G, Knutzen V, Marriage V. An improved system for catheter loading during embryo transfer. J In Vitro Fert Embryo Transf 1987; 4:346-8. [PMID: 3437221 DOI: 10.1007/bf01555384] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- L K Vaught
- Northern Nevada Fertility Center, Reno 89503
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Southgate L, Julian P, Salkind M. Undergraduate education in general practice. Present emphases and future directions. Practitioner 1987; 231:1294-7. [PMID: 3505023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Julian P, Herxheimer A. Doctors' anxieties in prescribing. J R Coll Gen Pract 1977; 27:662-5. [PMID: 616855 PMCID: PMC2158636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Anxieties about prescribing were examined in two seminars for trainee general practitioners. These were caused by four main problems: inadequacies in diagnostic skill, treatment policy, understanding or experience, and anxiety about control of the treatment. Ways of reducing these anxieties, for example by sharing them with the patient, are discussed.
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