James Grace, Ph.D.
Senior Research Scientist
Biography
EDUCATION
Ph.D., Michigan State University
M.S., Clemson University
B.S., Biology, Presbyterian College
BACKGROUND
2015 - present Senior Research Scientist. U.S. Geological Survey, ST
2002 - 2014 Senior Research Ecologist, U.S. Geological Survey, GS-15
1993 - present Adjunct Professor, Department of Biology, University of Louisiana
2002 - present Affiliate Faculty, School of Renewable Natural Resources, LSU
1992 - 2002 Research Ecologist, U.S. Geological Survey, Biological Division
1990 - 1993 Professor, Department of Botany, Louisiana State University
1985 - 1990 Associate Professor, Department of Botany, Louisiana State Univ.
1989 Visiting Professor, Louisiana Universities Marine Consortium
1986 Visiting Scientist, Div. Wildlife, CSIRO, Darwin, Australia
1980‑1985 Assistant Professor, Dept. Botany and Microbiology, Univ. Arkansas summer
1980 Assistant Professor, Kellogg Biological Station, Michigan State Univ.
After graduate school, he held faculty positions at the University of Arkansas and Louisiana State University, where he reached the level of Full Professor. He currently holds an Adjunct Professorship in Biology at the University of Louisiana in Lafayette. In 2000, he received the millennium Meritorious Research Award from the Society of Wetland Scientists and in 2003 received the National Science Excellence Award from the U.S. Geological Survey. He was selected to be a Fellow of the Ecological Society of America and promoted to the Senior Scientist ranks in 2014. In 2019 he received the designation of ‘Highly-Cited Researcher’ by the Web of Science in recognition of his scientific impact during the past decade. He has published over 200 papers and reports, including 3 books, one on competitive interactions, one on community analysis, and one on structural equation modeling.
Latest news releases related to our work:
Selected as “Highly-Cited Researcher” by Web of Science. https://clarivate.com/news/global-highly-cited-researchers-2019-list-reveals-top-talent-in-the-sciences-and-social-sciences/
Gabler, Osland, and Grace et al. 2016 featured in two press releases:
https://www.usgs.gov/news/changes-rainfall-temperature-expected-transform-coastal-wetlands-century
Grace et al. 2016 Nature Paper one of the Top 5% of Science Stories of 2016. According to Altmetric, our work was among the top science stories of the year in 2016 (http://nature.altmetric.com/details/4987997). The article was featured in 12 science news articles and discussed in 5 blogs, in addition to being featured in Nature Magazine (http://www.nature.com/nature/journal/vaop/ncurrent/full/nature16867.html).
Editor's Choice Award, Landscape and Urban Planning (2016). Also featured in The Atlantic: http://www.citylab.com/commute/2016/01/sprawl-social-mobility-ewing-chetty-krugman/431535/
Promoted to Senior Executive Service- Senior Scientist (2015): http://internal.usgs.gov/thecore/news/2015/03/16/announcing-our-newest-senior-scientists/
Elected Fellow of the Ecological Society of America (2014): http://www.usgs.gov/newsroom/article.asp?ID=3966
The Great Productivity-Diversity Debate: http://1560811.mediaspace.kaltura.com/media/James+Grace+pt+1/0_yy2jc1c3/...
Recommended Reading by Faculty of 1000 (2014): http://f1000.com/prime/717961256?bd=1
Nature (2013): http://www.nature.com/news/world-governments-establish-biodiversity-pane...
News Coverage (2013): http://www.nola.com/environment/index.ssf/2013/04/louisiana_seafood_heal...
USGS News Releases (2013): http://www.usgs.gov/newsroom/article.asp?ID=3544#.UVr1J7KPW8A
Science Perspectives piece (2011): http://www.sciencemag.org/content/333/6050/1709.full
National Science Foundation press release (2011): http://www.nsf.gov/news/news_summ.jsp?cntn_id=121691&org=DEB&from=news
USGS News Release (2010): http://www.usgs.gov/newsroom/article.asp?ID=2619
Press (2010): http://www.examiner.com/liberal-in-national/study-climate-change-adverse...
News (2010): http://www.climatecentral.org/breaking/blog/climate_in_context_a_60_year...
Conservation Maven (2010): http://www.conservationmaven.com/frontpage/predicting-the-performance-of...
USGS Genetics Program News Pick (2010): http://biology.usgs.gov/genetics_genomics/spotlight_2010.html
For more news and information, search 'Jim Grace USGS'.
List of publications can be found at my Google Scholar Profile: http://scholar.google.com/citations?user=53SGwowAAAAJ&hl=en&oi=ao
Training website for structural equation modeling: https://www.usgs.gov/centers/wetland-and-aquatic-research-center/science...
Science and Products
The Response of Coastal Wetlands to Sea-level Rise: Understanding how Macroscale Drivers Influence Local Processes and Feedbacks
The purpose of this work is to advance our understanding of how coastal wetland responses to sea-level rise (SLR) within the conterminous United States are likely to vary as a function of local, regional, and macroscale drivers, including climate. Based on our interactions with managers and decision makers, as well as our knowledge of the current state of the science, we propose to: (a)...
The response of coastal wetlands to sea-level rise: Understanding how macroscale drivers influence local processes and feedbacks
The purpose of this work is to advance our understanding of how coastal wetland responses to SLR within the conterminous United States are likely to vary as a function of local, regional, and macroscale drivers, including climate. Based on our interactions with managers and decision makers, as well as our knowledge of the current state of the science, we propose to (a) conduct a national...
Development of a Multimetric Index for Integrated Assessment of Salt Marsh Condition in the Northeast Coastal and Barrier Network
Salt marsh ecosystems along all US coastlines have been altered, degraded, and destroyed by human activities, including ditching and drainage of the marsh platform, tidal restrictions, discharge of pollutants, and introduction of invasive species. The National Park Service conducts long-term monitoring of salt marsh vegetation and nekton (fish and free-swimming crustaceans) to provide...
Quantitative Analysis Using Structural Equation Modeling
USGS scientists have been involved for a number of years in the development and use of Structural Equation Modeling (SEM). This methodology represents an approach to statistical modeling that focuses on the study of complex cause-effect hypotheses about the mechanisms operating in systems. SEM is increasingly used in ecological and environmental studies and this site seeks to provide...
Improving Our Ability to Forecast Tidal Marsh Response to Sea Level Rise
Our overall objective is to understand what controls the vulnerability of coastal marshes to risks associated with global change drivers and rising sea levels. Fundamental questions pertaining to coastal wetland vulnerability still need to be addressed. What factors explain spatial and geographic variation in tidal wetland vulnerability? How do short term climatic events (storms) influence the...
Structural Equation Modeling in Support of Conservation
Understanding systems sometimes requires approaches that allow for both the discovery of the a system's structure and the estimation of its implications. Structural Equation Modeling - SEM - is one tool scientists use to better understand the complex world in which we live.
Mechanisms of Coastal Marsh Elevation Regulation
Sediment deposition serves an important role in the long-term maintenance of coastal marshes. USGS investigates the mechanisms of coastal marsh elevation regulation to help predict marsh sediment requirements under various sea level rise scenarios.
Hurricane Sandy effects on coastal marsh elevation change
High-magnitude storm events such as Hurricane Sandy are powerful agents of geomorphic change in coastal marshes, potentially altering their surface elevation trajectories. But how do a storm’s impacts vary across a large region spanning a variety of wetland settings and storm exposures and intensities. We determined the short-term impacts of...
Yeates, Alice G.; Grace, James; Olker, Jennifer H.; Guntenspergen, Glenn R.; Cahoon, Donald; Adamowicz, Susan C.; Anisfeld, Shimon C.; Barrett, Nels; Benzecry, Alice; Blum, Linda K.; Christian, Rober T; Grzyb, Joseph; Kracauer Hartig, Ellen; Hines Leo, Kelly; Lerberg, Scott; Lynch, James C.; Maher, Nicole; Megonigal, J Patrick; Reay, William G.; Siok, Drexel; Starke, Adam; Turner, Vincent; Warren, Scott Climate and local environment structure asynchrony and the stability of primary production in grasslands
Aim Climate variability threatens to destabilize production in many ecosystems. Asynchronous species dynamics may buffer against such variability when a decrease in performance by some species is offset by an increase in performance of others. However, high climatic variability can eliminate species through stochastic extinctions or cause similar...
Gilbert, B.; MacDougall, A.S.; Kadoya, T.; Akasaka, M.; Bennett, J. R.; Lind, E.M.; Flores-Moreno, H.; Firn, J.; Hautier, Y.; Borer, E.T.; Seabloom, E.W.; Adler, P.B.; Cleland, E.E.; Grace, James; Harpole, W.S.; Esch, E.H.; Moore, J.L.; Knops, J.; McCulley, R.; Mortensen, B.; Bakker, J.; Fay, P.A. A 'weight of evidence' approach to evaluating structural equation models
It is possible that model selection has been the most researched and most discussed topic in the history of both statistics and structural equation modeling (SEM). The reason for this is because selecting one model for interpretive use from amongst many possible models is both essential and difficult. The published protocols and advice for model...
Grace, James Structural equation modeling
This chapter introduces background and historical information on how structural equation modeling (SEM) came to be developed. Then, the main differences between SEM and earlier multivariate methods are explained. The chapter describes three main applications of SEM: path analysis, factor analysis, and hybrid models. Some computer programs are...
Miller, Matt; Tasic, Ivana; Lyons, Torrey; Ewing, Reid; Grace, James B. Conceptual frameworks
The chapter starts by addressing some of the issues that come from not using a conceptual framework. This point is illustrated using an example with causal factors. The chapter then goes on to explain the mechanics of establishing conceptual frameworks. Lastly, it lays out a step-by-step guide on how to create a framework—generating a set of...
Park, Keunhyun; Grace, James B.; Ewing, Reid Scientist’s guide to developing explanatory statistical models using causal analysis principles
Recent discussions of model selection and multimodel inference highlight a general challenge for researchers, which is how to clearly convey the explanatory content of a hypothesized model or set of competing models. The advice from statisticians for scientists employing multimodel inference is to develop a well‐thought‐out set of candidate models...
Grace, James B.; Irvine, Kathryn The importance of natural versus human factors for ecological conditions of streams and rivers
Streams are influenced by watershed-scale factors, such as climate, geology, topography, hydrology, and soils, which mostly vary naturally among sites, as well as human factors, agriculture and urban development. Thus, natural factors could complicate assessment of human disturbance. In the present study, we use structural equation modeling and...
Tang, Tao; Stevenson, R. Jan; Grace, James Climatic controls on the distribution of foundation plant species in coastal wetlands of the conterminous United States: Knowledge gaps and emerging research needs
Foundation plant species play a critical role in coastal wetlands, often modifying abiotic conditions that are too stressful for most organisms and providing the primary habitat features that support entire ecological communities. Here, we consider the influence of climatic drivers on the distribution of foundation plant species within coastal...
Osland, Michael; Grace, James; Guntenspergen, Glenn; Thorne, Karen; Carr, Joel; Feher, Laura Discoveries and novel insights in ecology using structural equation modeling
As we enter the era of data science (Lortie 2018), quantitative analysis methodologies are proliferating rapidly, leaving ecologists with the task of choosing among many alternatives. The use of structural equation modeling (SEM) by ecologists has increased in recent years, prompting us to ask users a number of questions about their experience...
Laughlin, Daniel C.; Grace, James Patterns of resource allocation in a coastal marsh plant (Schoenoplectus americanus) along a sediment-addition gradient
Reductions in sediment delivery to coastal marshes increase their vulnerability to relative sea-level rise. Sediment pulses from storm events and commercial dredge-spray operations (e.g., beneficial use) represent increasingly important sediment sources to otherwise sediment-deprived marshes. These sediments can stimulate plant growth by providing...
Temple, Nigel A.; Grace, James B.; Cherry, Julia A
Hurricane Sandy impacts on coastal wetland resilience
The goal of this research was to evaluate the impacts of Hurricane Sandy on surface elevation trends in estuarine marshes located across the northeast region of the United States from Virginia to Maine using data from an opportunistic (in other words, not strategic) and collaborative network (from here on, an opportunistic network) of surface...
Cahoon, Donald R.; Olker, Jennifer H.; Yeates, Alice G.; Guntenspergen, Glenn R.; Grace, James B.; Adamowicz, Susan C.; Anisfeld, Shimon C.; Baldwin, Andrew H.; Barrett, Nels; Beckett, Leah; Benzecry, Alice; Blum, Linda K.; Burdick, David M.; Crouch, William; Ekberg, Marci Cole; Fernald, Sarah; Grimes, Kristin Wilson; Grzyb, Joseph; Hartig, Ellen Kracauer; Kreeger, Danielle A.; Larson, Marit; Lerberg, Scott; Lynch, James C.; Maher, Nicole; Maxwell-Doyle, Martha; Mitchell, Laura R.; Mora, Jordan; O'Neill, Victoria; Padeletti, Angela; Prosser, Diann J.; Quirk, Tracy; Raposa, Kenneth B.; Reay, William G.; Siok, Drexel; Snow, Christopher; Starke, Adam; Stevenson, J. Court; Staver, Lorie; Turner, Vincent The plant diversity sampling design for The National Ecological Observatory Network
The National Ecological Observatory Network (NEON) is designed to facilitate an understanding of the impact of environmental change on ecological systems. Observations of plant diversity—responsive to changes in climate, disturbance, and land use, and ecologically linked to soil, biogeochemistry, and organisms—result in NEON data products that...
Barnett, David T.; Adler, Peter B.; Chemel, Benjamin R.; Duffy, Paul A.; Enquist, Brian J.; Grace, James B.; Harrison, Susan P.; Peet, Robert K.; Schimel, David S.; Stohlgren, Thomas J.; Vellend, Mark
Biodiversity Critical to Maintaining Healthy Ecosystems
Researchers have found clear evidence that biological communities rich in species are substantially healthier and more productive than those depleted of species.