@article{arenas_spence_nilon_leggett_2022, title={Diversifying the Field of Forestry Through a Graduate Fellowship Program: A Pilot Study on the Expectations of Students of Color}, volume={8}, ISSN={["1938-3746"]}, url={https://doi.org/10.1093/jofore/fvac024}, DOI={10.1093/jofore/fvac024}, abstractNote={Abstract}, journal={JOURNAL OF FORESTRY}, author={Arenas, Aaron A. and Spence, Porche L. and Nilon, Charles H. and Leggett, Zakiya H.}, year={2022}, month={Aug} }
 @article{gerald_deshazo_patterson_spence_2022, title={Growth and chemotaxis of nematodes reduced upon exposure to Third Fork Creek surface water}, volume={34}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85122954599&partnerID=MN8TOARS}, DOI={10.1186/s12302-021-00579-8}, abstractNote={Abstract}, number={1}, journal={Environmental Sciences Europe}, author={Gerald, C. and Deshazo, B. and Patterson, H. and Spence, P.}, year={2022} }
 @article{spence_phillips_mcallister_white_hollowell_2020, title={Student-scientist curriculum: Integrating inquiry-based research experiences and professional development activities into an introductory biology laboratory course}, volume={21}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85099381591&partnerID=MN8TOARS}, DOI={10.1128/JMBE.V21I3.2225}, abstractNote={
            We designed a 16-week scaffolded student-scientist curriculum using inquiry-based research experiences integrated with professional development activities. This curriculum was implemented to teach undergraduate students enrolled in an introduction to biology course about enzyme activity, biochemical reactions, and alcohol fermentation. While working through the curriculum, students completed the entire scientific process by planning experiments, maintaining laboratory journals, analyzing and interpreting data, peer-reviewing research proposals, and producing and presenting a poster. The overall outcome was for students to complete a multiweek, collaborative, student-scientist project using
            Saccharomyces cerevisiae
            as the model organism. Student learning outcomes were evaluated using formative assessments (post-Research on the Integrated Science Curriculum survey and peer- and self-reflection worksheets) and summative assessments (pre/post assessments and assignment grades). Results indicated that more than 50% of the students scored 70% or higher on the collaborative student-scientist project, demonstrated several self-reported learning gains in scientific concepts and skills, and reported they would recommend this laboratory course to their peers. By providing the opportunity for students to carry out the entire scientific process, this curriculum enhanced their technical, analytical, and communication skills.
          }, number={3}, journal={Journal of Microbiology and Biology Education}, author={Spence, P.L. and Phillips, R.S. and McAllister, A.R. and White, S.L. and Hollowell, G.P.}, year={2020} }
 @article{spence_walker_robarge_preston_osmond_2015, title={Comparing nitrous oxide losses from three residential landscapes under different management schemes following natural rainfall events}, volume={18}, ISSN={["1573-1642"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84949200350&partnerID=MN8TOARS}, DOI={10.1007/s11252-015-0453-9}, number={4}, journal={URBAN ECOSYSTEMS}, author={Spence, Porche L. and Walker, John T. and Robarge, Wayne P. and Preston, Bill and Osmond, Deanna L.}, year={2015}, month={Dec}, pages={1227–1243} }
 @article{spence_floyd_howard_simmons_2015, title={Ecosystem Services and Environmental Health}, volume={9}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85066431537&partnerID=MN8TOARS}, DOI={10.4137/EHI.S38845}, abstractNote={Yet, in many developed and undeveloped parts of the world, consequences of these interrelated processes and the risks and hazards that they pose to both human health and ecosystems remain underexplored. This special issue of the Environmental Heath Insights will draw seek draw on new, empirical research which examines the nexus between ecosystem services and environmental health in the context of a rapidly changing world.}, journal={Environmental Health Insights}, author={Spence, P.L. and Floyd, M.F. and Howard, J. and Simmons, C.}, year={2015} }
 @article{spence_2015, title={Using Caffeine as a Water Quality Indicator in the Ambient Monitoring Program for Third Fork Creek Watershed, Durham, North Carolina}, volume={9}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85073238921&partnerID=MN8TOARS}, DOI={10.4137/EHI.S19588}, abstractNote={ Caffeine has been suggested as a chemical indicator for domestic wastewater in freshwater systems, although it is not included in water quality monitoring programs. The Third Fork Creek watershed in Durham, NC, is highly urbanized, with a history of receiving untreated wastewater from leaking and overflowing sanitary sewers. The poor water quality originating in the Third Fork Creek watershed threatens its intended uses and jeopardizes drinking water, aquatic life, and recreational activities provided by Jordan Lake. Organic waste contaminants have been detected in both Third Fork Creek watershed and Jordan Lake; however, the sampling periods were temporary, resulting in a few samples collected during nonstorm periods. It is recommended that (1) the concentration of caffeine and other organic waste contaminants are determined during storm and nonstorm periods and (2) caffeine is monitored regularly with traditional water quality indicators to evaluate the health of Third Fork Creek watershed. }, journal={Environmental Health Insights}, author={Spence, P.L.}, year={2015} }
 @article{spence_jordan_2013, title={Effects of nitrogen inputs on freshwater wetland ecosystem services - A Bayesian network analysis}, volume={124}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84877063290&partnerID=MN8TOARS}, DOI={10.1016/j.jenvman.2013.03.029}, abstractNote={Increased nitrogen (N) inputs to freshwater wetlands potentially affect the interaction between nitrous oxide (N2O) emissions and outflow water quality. The purpose of this study is to evaluate the influence of N inputs on N removal, as well as the interaction between N2O emissions and outflow water quality, using a Bayesian Belief Network (BBN). The BBN was developed by linking wetland classification, biogeochemical processes, and environmental factors. Empirical data for 34 freshwater wetlands were gathered from a comprehensive review of published peer-reviewed and gray literature. The BBN was implemented using 30 wetlands (88% of the case file) and evaluated using a single test file containing 4 wetlands (12% of the case file). The BBN implies it is not average annual total N load entering the wetland, but the N removal efficiency that influences the interactions between N2O emissions and outflow water quality. Even though the network has a very low error rate indicating a high predictive accuracy, additional testing and larger training and testing datasets would increase confidence in the model's ability to provide robust predictions and to reduce the uncertainty resulting from an incomplete dataset and knowledge gaps regarding the interactions between N2O emissions and outflow water quality.}, journal={Journal of Environmental Management}, author={Spence, P.L. and Jordan, S.J.}, year={2013}, pages={91–99} }
 @article{spence_osmond_childres_heitman_robarge_2012, title={Effects of Lawn Maintenance on Nutrient Losses Via Overland Flow During Natural Rainfall Events}, volume={48}, ISSN={1093-474X}, url={http://dx.doi.org/10.1111/j.1752-1688.2012.00658.x}, DOI={10.1111/j.1752-1688.2012.00658.x}, abstractNote={Spence, Porchè L., Deanna L. Osmond, Wesley Childres, Joshua L. Heitman, and Wayne P. Robarge, 2012. Effects of Lawn Maintenance on Nutrient Losses Via Overland Flow During Natural Rainfall Events. Journal of the American Water Resources Association (JAWRA) 48(5): 909‐924. DOI: 10.1111/j.1752‐1688.2012.00658.x}, number={5}, journal={JAWRA Journal of the American Water Resources Association}, publisher={Wiley}, author={Spence, Porchè L. and Osmond, Deanna L. and Childres, Wesley and Heitman, Joshua L. and Robarge, Wayne P.}, year={2012}, month={May}, pages={909–924} }
 @article{walker_spence_kimbrough_robarge_2008, title={Inferential model estimates of ammonia dry deposition in the vicinity of a swine production facility}, volume={42}, ISSN={["1873-2844"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-41449099938&partnerID=MN8TOARS}, DOI={10.1016/j.atmosenv.2007.06.004}, abstractNote={This project investigates NH3 dry deposition around a commercial swine production facility in eastern North Carolina. Passive diffusion-tube samplers were used to measure weekly integrated NH3 concentrations at 22 locations along horizontal gradients from the barn/lagoon emissions complex (source) out to a distance of 700 m. A two-layer canopy compensation point model was used to predict bi-directional NH3 exchange within a 500 m circular buffer surrounding the source. The model takes into account differences in soil and vegetation emission potential, as well as canopy physical characteristics, among three primary surfaces surrounding the site: forest, crops spray fertilized with swine waste, and other fertilized crops. Between June 2003 and July 2005, mean observed NH3 concentrations ranged from 169.0 μg NH3 m−3 at a distance of 10 m from the source to 7.1 and 13.0 μg NH3 m−3 at 612 and 698 m in the predominant upwind and downwind directions, respectively. Median predicted dry deposition rates ranged from 145 kg NH3–N ha−1 yr−1 at 10 m from the source to 16 kg NH3–N ha−1 yr−1 at 500 m, which is ≈3.5× wet deposition of NH4+–N. Assuming a steady-state emission factor of 7.0 kg NH3 animal−1 yr−1 and a median population of 4900 animals, NH3 dry deposition over the nearest 500 m from the barn/lagoon complex accounted for 10.4% (3567 kg NH3) of annual emissions (34,300 kg NH3). A model sensitivity analysis shows that predicted deposition rates are more sensitive to assumptions regarding cuticular uptake relative to soil and vegetation emission potentials.}, number={14}, journal={ATMOSPHERIC ENVIRONMENT}, author={Walker, John and Spence, Porche' and Kimbrough, Sue and Robarge, Wayne}, year={2008}, month={Apr}, pages={3407–3418} }
 @article{stow_walker_cardoch_spence_geron_2005, title={N<sub>2</sub>O emissions from streams in the Neuse River watershed, North Carolina}, volume={39}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-25144433402&partnerID=MN8TOARS}, DOI={10.1021/es0500355}, abstractNote={We present N2O emission data from 11 sites in the Neuse River watershed. Emissions were measured using a static surface enclosure technique deployed on eight sites on the main river channel and three tributary sites. Ancillary data collected included dissolved oxygen, nitrate, total nitrogen, ammonium, dissolved organic carbon, total phosphorus, and temperature. Analysis using standard linear models, and classification and regression trees (CART), indicated nitrate to be the primary driving variable associated with N2O emission, although dissolved organic carbon concentration and water temperature were positively related with N2O emission as well. Relationships between nitrate concentration and N2O emission were consistent with those found in previous studies, although the data presented here represent the lower end of the range for both variables among published studies. Using our measured N2O emission rates along with literature values for the ratio of nitrogen gas to N2O produced during denitrification, we estimate N loss via denitrification in the Neuse River is approximately 17% of the annual N load delivered to the estuary.}, number={18}, journal={Environmental Science and Technology}, author={Stow, C.A. and Walker, J.T. and Cardoch, L. and Spence, P. and Geron, C.}, year={2005}, pages={6999–7004} }