Education

Research Description

Dr. Nelson’s research takes a data-intensive, management-focused, and interdisciplinary approach to the study of complex biological system dynamics. Her specific research interests include: using data analytics and integrated models to inform agriculture, aquaculture, water, and coastal resources management; estimating estuarine system futures as a function of local and global change; identifying risks to food security in coastal basins; linking data mining and mechanistic modeling approaches; and investigating spatial and temporal dynamics of socio-environmental systems across settings and scales.

Publications

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Grants

Spatiotemporal Reconstruction of Historical Swine CAFO Spread in North Carolina and Connections to Water Quality

NCSU Sea Grant Program(3/01/19 - 1/31/20)

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Spatiotemporal Reconstruction of Historical Swine CAFO Spread in North Carolina and Connections to Water Quality

Sponsor: NCSU Sea Grant Program

Start Date: 3/01/19

End Date: 1/31/20

Abstract

In North Carolina, swine CAFOs produce over 17 million tons of manure per year. Most swine CAFOs use one or several open air lagoons to store waste, which is later distributed over sprayfields. Presently, there are an estimated 3,379 lagoons in North Carolina, most of which are clustered in the Coastal Plain. These lagoons were largely constructed prior to 1997, at which time a moratorium was placed on the construction or expansion of hog farms and lagoons. Although the post-1997 locations of swine waste lagoons are known, the spatiotemporal growth of the swine industry prior to the moratorium remains undocumented. The proposed project will achieve the following two objectives: (1) Reconstruct the historical geospatial growth of swine CAFO waste lagoons from 1984 to 2012 within the Coastal Plain of North Carolina using satellite imagery. Waste lagoons are readily identifiable through analysis of satellite imagery and are co-located with swine CAFOs. (2) Analyze connections, or lack thereof, between historical water quality trends and swine waste lagoon densities. Data obtained by achieving Objective 1 will be used in spatial regressions applied to assess relationships between swine CAFO densities and water quality.

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Building a Smarter Pheromone Trap Network: Development of a Real-time, Infrared Sensor for Corn Earworm Pheromone Traps

NC Soybean Producers Association, Inc.(2/01/19 - 1/31/20)

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Building a Smarter Pheromone Trap Network: Development of a Real-time, Infrared Sensor for Corn Earworm Pheromone Traps

Sponsor: NC Soybean Producers Association, Inc.

Start Date: 2/01/19

End Date: 1/31/20

Abstract

Corn earworm (Helicoverpa zea Boddie) has been the target of black light and pheromone trapping networks across North Carolina for decades. Information generated by this network has been communicated to soybean growers through traditional extension meetings and digital resources (e.g., blogs, twitter, websites). Although the information provides an indication of adult corn earworm activity, the time lag between moth counting and online data availability limits growers ability to time scouting activities, determine economic thresholds, and apply insecticides. Automation of earworm specific trapping networks can address this need by eliminating the observer via seamless data integration into web and phone app interfaces. Moreover, automated traps require less effort to maintain than conventional black light systems that catch many different moth species. As a result, the number of traps could be expanded to monitor moth activity in areas that are not served by the NCSU Earworm Trap Network.

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RAPID:Collaborative Research:Assessing Chemical and Microbiological Contamination in Environmental Waters in Eastern North Carolina After Hurricane Florence

National Science Foundation (NSF)(12/01/18 - 11/30/19)

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RAPID:Collaborative Research:Assessing Chemical and Microbiological Contamination in Environmental Waters in Eastern North Carolina After Hurricane Florence

Sponsor: National Science Foundation (NSF)

Start Date: 12/01/18

End Date: 11/30/19

Abstract

The flooding caused by Hurricane Florence, which charted a path through southeast NC, provides an immediate and unprecedented opportunity to study the potential dispersal of contaminants into the environment by floodwaters. Contaminants include pathogens and nutrients associated with waste products of confined animal feeding operations (CAFOs) and slaughterhouses, heavy metals associated with coal ash, and emerging contaminants related to industrial facilities and wastewater treatment operations. In particular, the NC counties most affected by Florence house thousands of swine operations that treat the waste of millions of animals in open lagoons and sprayfields. Thousands of additional poultry operations collect dry waste and transport it to nearby farms for land application. Waters from Hurricane Florence are currently inundating these lands, mobilizing agricultural wastes and emerging contaminants. This work is prudent, given that extreme flooding events are likely to become more common with the growing threats of climate change.

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RAPID: Coastal Consequences of Engineered Water Control Systems: The Role of Freshwater Discharges in Florida's Ongoing Harmful Algal Bloom Crises.

National Science Foundation (NSF)(9/15/18 - 2/29/20)

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RAPID: Coastal Consequences of Engineered Water Control Systems: The Role of Freshwater Discharges in Florida's Ongoing Harmful Algal Bloom Crises.

Sponsor: National Science Foundation (NSF)

Start Date: 9/15/18

End Date: 2/29/20

Abstract

The topic of “land-sea management” – in which ecological connections between land and sea are explicitly considered – has increasingly gained awareness and appreciation given that many marine environments respond more strongly to changes occurring on land than at sea. However, segregation of terrestrial and marine management jurisdictions across governing agencies, lack of knowledge on integrated land-sea dynamics, and scarcity of cross-system training among professionals, tradesmen, and academics have historically created barriers to land-sea research and management. In the proposed research, we will specifically focus on resolving the effects of human-managed freshwater control regimes on the magnitude and duration of coastal algal blooms. As a representative case study, we will analyze historical observations and high-frequency water quality measurements from the Lake Okeechobee-Caloosahatchee River-Gulf of Mexico system in Florida, which is the site of a severe and ongoing harmful algal bloom.

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FACT: Pigs, Poultry, the Planet, and Data-driven Problem Solving (P4)

US Dept. of Agriculture (USDA) - National Institute of Food and Agriculture(2/15/19 - 2/14/24)

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FACT: Pigs, Poultry, the Planet, and Data-driven Problem Solving (P4)

Sponsor: US Dept. of Agriculture (USDA) - National Institute of Food and Agriculture

Start Date: 2/15/19

End Date: 2/14/24

Abstract

This project will address the food animal production industry’s need for professionals and extension specialists who possess the skills needed to thrive in today’s data-rich world. The long-term goal of this project is to meet increasing meat demands across the global market through sustainable intensification, thereby also broadening export opportunities for American meat producers. To meet this goal and address a critical shortage of personnel who are data analytics-aware, the food animal production workforce needs to be modernized with professionals and extension specialists who possess data literacy and holistic problem-solving skills. We will create a 10-week summer program dedicated to supplying the workforce with students trained in these three proficiency areas. This summer program, titled the Pigs, Poultry, the Planet, and data-driven Problem Solving (P4) Summer Fellowship Program, will prepare undergraduate students for contemporary careers in food animal production, and specifically target the swine and poultry production industries.

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Continuation of Nutrient Effects on Sweetpotato Yield and Shape

NC Sweet Potato Commission(3/01/18 - 2/28/20)

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Continuation of Nutrient Effects on Sweetpotato Yield and Shape

Sponsor: NC Sweet Potato Commission

Start Date: 3/01/18

End Date: 2/28/20

Abstract

The objectives of this research continue and build upon findings of a project begun in 2016 to investigate the influence of different cultural practices, especially different nitrogen types and timing of applications, on the shape and size development and yields of multiple sweetpotatoes varieties. Additional specific aims are to: 1. Continue to fine tune the unique equipment and analytical methodologies that have been developed in the last two years to scan and analyze the shape and size characteristics of different treatment populations of sweetpotatoes. 2. The ultimate aim of this work is to minimize the production of over/under sized and misshappened sweetpotatoes by identifying those numerous factors that influence size and shape.

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Harmful Algal Blooms in the Indian River Lagoon

US Environmental Protection Agency (EPA)(10/01/18 - 9/30/19)

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Harmful Algal Blooms in the Indian River Lagoon

Sponsor: US Environmental Protection Agency (EPA)

Start Date: 10/01/18

End Date: 9/30/19

Abstract

Harmful algal blooms (HABs) are major threats to the health and stability of the Indian River Lagoon (IRL), and directly or indirectly impact the integrity of many key components of the ecosystem, including seagrasses, drift algae, benthic invertebrates (e.g. clams and oysters), fish and marine mammals. In addition, HABs can negatively impact commercially and recreationally important human uses of the IRL and can directly affect human health via the production of toxins. In this study, a network of ten strategically placed sites that span the IRL will be sampled twice per month and analyzed for phytoplankton composition, abundance, biovolume and biomass, including the identification of HAB species. In the short-term, observations of major phytoplankton blooms and the dominant taxa in the blooms, will be reported to IRL NEP and other key agencies. The data produced will be used in quantitative modeling applications to define environmental drivers for blooms, and how they vary by region of the IRL and HAB species. Additional medium/long term goals are to generate model outputs that can forecast HAB development and identify optimal targets for management efforts to control blooms.

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