Julien Martin, Ph.D.
Biography
EDUCATION
Ph.D., Wildlife Ecology and Conservation, University of Florida
RESEARCH
Julien Martin is a Research Wildlife Biologist at the US Geological Survey's Wetland and Aquatic Research Center. He obtained a Ph.D. in the department of Wildlife Ecology and Conservation at the University of Florida. He is a courtesy faculty: (1) in the Department of Wildlife Ecology and Conservation at the University of Florida; and (2) in the College of Marine Science at the University of South Florida. His expertise includes: ecological modeling, population dynamics and the application of decision theory to natural resource management.
Science and Products
Real-time Coastal Salinity Index for monitoring coastal drought and ecological response to changing salinity values
Many coastal areas are experiencing departures from normal conditions due to changing land use and climate patterns, including increased frequency, severity, or duration of floods and droughts, in some cases combinations of the two. To address these issues, the U.S. Geological Survey developed the Coastal Salinity Index (CSI) to identify and communicate fluctuating salinity conditions due to...
Population Ecology of Florida Manatees
USGS is working with partners to understand how the federally protected Florida manatee population changes over time and responds to threats.
Quantitative Framework to Model Risk of Collisions between Marine Wildlife and Boats
Collisons between wildlife and vehicles threaten many species, and can lead to human loss of life, injuries, and loss of property. USGS is developing models to help evaluate the effectiveness of wildlife protection zones and optimize the design of these protected areas.
A Structured Decision-Making Framework for Controlling, Monitoring, and Containment of Invasive Species through Trapping: An Application to the Argentine Black and White Tegu
USGS is applying decision analysis to identify cost-effective methods for controlling invasive species like the Argentine black and white tegu.
Climate Change Adaptation for Coastal National Wildlife Refuges
National Wildlife Refuges provide habitat for important fish and wildlife species and services that benefit coastal communities, like storm-surge protection. USGS scientists are helping coastal refuges plan for and adapt to sea-level rise.
Decision Analysis to Help Improve the Effectiveness of Invasive Plants Management
Melaleuca is an invasive tree that is highly problematic in the Everglades, threatening native wildlife and habitat. USGS is helping to improve management strategies for the invasive plant.
Global Change and Conservation Triage on National Wildlife Refuges
As custodians of ecological goods and services valued by society, coastal National Wildlife Refuges (NWRs) have an especially important role to play in helping socio-ecological systems adapt to global-change processes.
Optimal Control Strategies for Invasive Exotics in South Florida
The establishment and proliferation of exotic plants and animals can interfere with native ecological processes and can cause severe stress to sensitive ecosystems.
Adaptive Habitat Conservation for Flatwoods Salamanders
USGS scientists investigate adaptive habitat conservation for Flatwoods salamanders.
Spatial conservation planning under uncertainty using modern portfolio theory and nash bargaining solution
In recent years, researchers from interdisciplinary teams involving ecologists, economists and operations re- searchers collaborated to provide decision support tools to address the challenges of preserving biodiversity by optimizing the design of reserves. The goal of this paper is to further advance this area of research and provide new...
Sierra-Altamiranda, Alvaro; Charkhgard, Hadi; Eaton, Mitchell J.; Martin, Julien; Yurek, Simeon; Udell, Bradley J. Category count models for adaptive management of metapopulations: Case study of an imperiled salamander
Managing spatially structured populations of imperiled species presents many challenges. Spatial structure can make it difficult to predict population responses to potential recovery activities, and learning through experimentation may not be advised if it could harm threatened populations. Adaptive management provides an appealing framework when...
O'Donnell, Katherine; Fackler, Paul L.; Johnson, Fred A.; Bonneau, Mathieu; Martin, Julien; Walls, Susan C. Spatial conservation planning under uncertainty: Adapting to climate change risks using modern portfolio theory
Climate change and urban growth impact habitats, species, and ecosystem services. To buffer against global change, an established adaptation strategy is designing protected areas to increase representation and complementarity of biodiversity features. Uncertainty regarding the scale and magnitude of landscape change complicates reserve planning...
Eaton, Mitchell J.; Yurek, Simeon; Haider, Zulqarnain; Martin, Julien; Johnson, Fred; Udell, Bradley J; Charkhgard, Hadi; Kwon, Changhyun Quantifying risk of whale–vessel collisions across space, time, and management policies
Transportation industries can negatively impact wildlife populations, including through increased risk of mortality. To mitigate this risk successfully, managers and conservationists must estimate risk across space, time, and alternative management policies. Evaluating this risk at fine spatial and temporal scales can be challenging, especially in...
Crum, Nathan J.; Gowan, Timothy A.; Krzystan, Andrea; Martin, Julien Optimal spatial allocation of control effort to manage invasives in the face of imperfect detection and misclassification
Imperfect detection and misclassification errors are often ignored in the context of invasive species management. Here we present an approach that combines spatially explicit models and an optimization technique to design optimal search and destroy strategies based on noisy monitoring observations. We focus on two invasive plants, melaleuca (...
Bonneau, Mathieu; Martin, Julien; Peyrard, Nathalie; Rodgers, LeRoy; Romagosa, Christina M.; Johnson, Fred Characterizing residence patterns of North Atlantic right whales in the southeastern U.S. with a multistate open robust design model
Effective conservation of endangered North Atlantic right whales (Eubalaena glacialis) requires information about their spatio-temporal distribution. Understanding temporal distribution is particularly important, because a portion of the population migrates between high latitude summer feeding grounds off the northeastern U.S. and Canadian...
Krystan, A.M.; Gowan, T.A.; Kendall, William L.; Martin, Julien; Ortega-Ortiz, J.G.; Jackson, K.B.; Knowlton, A.R.; Naessig, P.; Zani, M.; Schulte, D.W.; Taylor, C.R. Updated statewide abundance estimates for the Florida manatee
Knowing how many manatees live in Florida is critical for conservation and management of this threatened species. Martin et al. (2015) flew aerial surveys in 2011–2012 and estimated abundance in those years using advanced techniques that incorporated multiple data sources. We flew additional aerial surveys in 2015–2016 to count manatees and again...
Hostetler, Jeffrey A.; Edwards, Holly H.; Martin, Julien; Schueller, Paul Integrating encounter theory with decision analysis to evaluate collision risk and determine optimal protection zones for wildlife
1.Better understanding human‐wildlife interactions and their links with management can help improve the design of wildlife protection zones. One example is the problem of wildlife collisions with vehicles or human‐built structures (e.g. power lines, wind farms). In fact, collisions between marine wildlife and watercraft are among the major threats...
Udell, B.J.; Martin, Julien; Fletcher, R.J.; Bonneau, Mathieu; Edwards, Holly H.; Gowan, T.; Hardy, Stacie K.; Gurarie, E.; Calleson, C.S.; Deutsch, C.J.
An expert elicitation process to project the frequency and magnitude of Florida manatee mortality events caused by red tide (Karenia brevis)
Red tides (blooms of the harmful alga Karenia brevis) are one of the major sources of mortality for the Florida manatee (Trichechus manatus latirostris), especially in southwest Florida. It has been hypothesized that the frequency and severity of red tides may increase in the future because of global climate change and other factors. To improve...
Martin, Julien; Runge, Michael C.; Flewelling, Leanne J.; Deutsch, Charles J.; Landsberg, Jan H. Optimal control of an invasive species using a reaction-diffusion model and linear programming
Managing an invasive species is particularly challenging as little is generally known about the species’ biological characteristics in its new habitat. In practice, removal of individuals often starts before the species is studied to provide the information that will later improve control. Therefore, the locations and the amount of control have to...
Bonneau, Mathieu; Johnson, Fred A.; Smith, Brian J.; Romagosa, Christina M.; Martin, Julien; Mazzotti, Frank J.
Status and threats analysis for the Florida manatee (Trichechus manatus latirostris), 2016
Trichechus manatus (West Indian manatee), especially T. m. latirostris, the Florida subspecies, has been the focus of conservation efforts and extensive research since its listing under the Endangered Species Act of 1973. To determine the status of, and severity of threats to, the Florida manatee, a comprehensive revision and update of the manatee...
Runge, Michael C.; Sanders-Reed, Carol A.; Langtimm, Catherine A.; Hostetler, Jeffrey A.; Martin, Julien; Deutsch, Charles J.; Ward-Geiger, Leslie I.; Mahon, Gary L. Expert elicitation, uncertainty, and the value of information in controlling invasive species
We illustrate the utility of expert elicitation, explicit recognition of uncertainty, and the value of information for directing management and research efforts for invasive species, using tegu lizards (Salvator merianae) in southern Florida as a case study. We posited a post-birth pulse, matrix model in which four age classes of tegus are...
Johnson, Fred A.; Smith, Brian J.; Bonneau, Mathieu; Martin, Julien; Romagosa, Christina; Mazzotti, Frank J.; Waddle, J. Hardin; Reed, Robert; Eckles, Jennifer Kettevrlin; Vitt, Laurie J.
Florida Manatees Likely to Persist For At Least 100 Years—US Geological Survey
Florida’s iconic manatee population is highly likely to endure for the next 100 years, so long as wildlife managers continue to protect the marine mammals and their habitat, a new study by the US Geological Survey and the Florida Fish and Wildlife Research Institute has found.
Media Inquiries on USGS Manatee Research
We appreciate your interest in USGS' Sirenia Project. To help inform members of the media and public, we have provided relevant publications, reports, and websites.