Julien Martin, Ph.D.
Julien Martin is a Supervisory Biologist based at the Eastern Ecological Science Center.
Julien Martin is a Supervisory Biologist at the US Geological Survey's Eastern Ecological Science Center. He is the capability team manager of the Quantitative Methods and Decision Science team. He obtained a Ph.D. in the department of Wildlife Ecology and Conservation at the University of Florida. He is a courtesy faculty in the Department of Wildlife Ecology and Conservation at the University of Florida. His expertise includes: ecological modeling, population dynamics and the application of decision theory to natural resource management.
Professional Experience
01/2022-Present: Supervisory Biologist at the US Geological Survey (USGS) at the Eastern Ecological Science Center. Laurel, MD.
09/2014-01/2022: Research Wildlife Biologist at the US Geological Survey (USGS) Wetland Aquatic Research Center. Gainesville, FL.
07/2009-09/2014: Research Scientist at the Fish and Wildlife Research Institute/Florida Fish and Wildlife Conservation Commission (FWC), St. Petersburg, FL.
10/2019-present: Courtesy Associate Professor in the Department of Wildlife Ecology and Conservation, University of Florida, Gainesville.
01/2010-10/2019: Courtesy Assistant Professor in the Department of Wildlife Ecology and Conservation, University of Florida, Gainesville.
07/2007-06/2009: Postdoctoral Research Associate at Patuxent Wildlife Research Center (USGS, Laurel, MD).
09/2001-05/2007: Graduate Research Assistant at the Florida Cooperative Fish and Wildlife Research Unit, USGS/Department of Wildlife Ecology and Conservation at the University of Florida, Gainesville, FL, 40 hours/week. Supervisor:
09/2000-09/2001: Graduate Research Assistant at the Centre d’Etudes Biologique de Chize (CEBC), Centre National pour la Recherche Scientifique (CNRS) and French Polar Institute (IPEV), Chize, France.
10/1998-03/2000: Wildlife Field Biologist and environmental advisor in French Subantarctic islands, Centre National pour la Recherche Scientifique (CNRS) and French Polar Institute (IPEV), Kerguelen and Crozet islands, French Southern and Antarctic Lands.
1998: Field biologist for the Irish Fisheries Board, Dublin, Ireland.
Education and Certifications
Ph.D., Wildlife Ecology and Conservation, University of Florida
Science and Products
Adaptive Habitat Conservation for Flatwoods Salamanders
Climate Change Adaptation for Coastal National Wildlife Refuges
Optimal allocation of law enforcement patrol effort to mitigate poaching activities
Reconstructing population dynamics of a threatened marine mammal using multiple data sets
Modeling structural mechanics of oyster reef self-organization including environmental constraints and community interactions
Spatial conservation planning under uncertainty using modern portfolio theory and nash bargaining solution
Category count models for adaptive management of metapopulations: Case study of an imperiled salamander
Climate change adaptation for coastal national wildlife refuges
Spatial conservation planning under uncertainty: Adapting to climate change risks using modern portfolio theory
Quantifying risk of whale–vessel collisions across space, time, and management policies
Updated statewide abundance estimates for the Florida manatee
Optimal spatial allocation of control effort to manage invasives in the face of imperfect detection and misclassification
Integrating encounter theory with decision analysis to evaluate collision risk and determine optimal protection zones for wildlife
Characterizing residence patterns of North Atlantic right whales in the southeastern U.S. with a multistate open robust design model
Science and Products
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Adaptive Habitat Conservation for Flatwoods Salamanders
USGS scientists investigate adaptive habitat conservation for Flatwoods salamanders.Climate Change Adaptation for Coastal National Wildlife Refuges
National Wildlife Refuges (NWRs) along the East Coast of the United States protect habitat for a host of wildlife species, while also offering storm surge protection, improving water quality, supporting nurseries for commercially important fish and shellfish, and providing recreation opportunities for coastal communities. Yet in the last century, coastal ecosystems in the eastern U.S. have been se - Data
- Publications
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Optimal allocation of law enforcement patrol effort to mitigate poaching activities
Poaching is a global problem causing the decline of species worldwide. Optimizing the efficiency of ranger patrols to deter poaching activity at the lowest possible cost is crucial for protecting species with limited resources. We applied decision analysis and spatial optimization algorithms to allocate efforts of ranger patrols throughout a national park. Our objective was to mitigate poaching acAuthorsJennifer F. Moore, Bradley Udell, Julien Martin, Ezechiel Turikunkiko, Michel K. MasozeraReconstructing population dynamics of a threatened marine mammal using multiple data sets
Models of marine mammal population dynamics have been used extensively to predict abundance. A less common application of these models is to reconstruct historical population dynamics, filling in gaps in observation data by integrating information from multiple sources. We developed an integrated population model for the Florida manatee (Trichechus manatus latirostris) to reconstruct its populatioAuthorsJ. Hostetler, Julien Martin, M. Kosempa, H. Edwards, K. Rood, S. Barton, Michael C. RungeModeling structural mechanics of oyster reef self-organization including environmental constraints and community interactions
Self-organization is a process of establishing and reinforcing local structures through feedbacks between internal population dynamics and external factors. In reef-building systems, substrate is collectively engineered by individuals that also occupy it and compete for space. Reefs are constrained spatially by the physical environment, and by mortality, which reduces production but exposes substrAuthorsSimeon Yurek, Mitchell Eaton, Romain Lavaud, R. Wilson Laney, Don DeAngelis, William E. Pine, Megan K. LaPeyre, Julien Martin, Peter C Frederick, Hongqing Wang, Michael R. Lowe, Fred Johnson, Edward V. Camp, Rua MordecaiSpatial 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 solutions to solve complex Spatial Conservation Planning (AuthorsAlvaro Sierra-Altamiranda, Hadi Charkhgard, Mitchell J. Eaton, Julien Martin, Simeon Yurek, Bradley J. UdellCategory 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 experimentation is considered too risky or time conAuthorsKaty O'Donnell, Paul L. Fackler, Fred A. Johnson, Mathieu Bonneau, Julien Martin, Susan C. WallsClimate change adaptation for coastal national wildlife refuges
National Wildlife Refuges (NWRs) along the East Coast of the United States protect habitat for a host of wildlife species, while also offering storm surge protection, improving water quality, supporting nurseries for commercially important fish and shellfish, and providing recreation opportunities for coastal communities. Yet in the last century, coastal ecosystems in the eastern U.S. have been seAuthorsMitchell Eaton, Jennifer K. Costanza, Fred A Johnson, Julien Martin, Laura TaylorSpatial 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 and exposes decision makers to risk of failing to meeAuthorsMitchell J. Eaton, Simeon Yurek, Zulqarnain Haider, Julien Martin, Fred Johnson, Bradley Udell, Hadi Charkhgard, Changhyun KwonQuantifying 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 systems where wildlife–vehicle collisions are rareAuthorsNathan J. Crum, Timothy A. Gowan, Andrea Krzystan, Julien MartinUpdated 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 applied advanced statistical techniques to estimateAuthorsJeffrey A. Hostetler, Holly H. Edwards, Julien Martin, Paul SchuellerOptimal 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 (Melaleuca quinquenervia) and Old World climbing fern (LyAuthorsMathieu Bonneau, Julien Martin, Nathalie Peyrard, LeRoy Rodgers, Christina M. Romagosa, Fred A. JohnsonIntegrating 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 faced by several endangered species of marine mammAuthorsB.J. Udell, Julien Martin, R.J. Fletcher, Mathieu Bonneau, Holly H. Edwards, T. Gowan, Stacie K. Hardy, E. Gurarie, C.S. Calleson, C.J. DeutschCharacterizing 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 Maritimes coasts and lower latitude calving and winteringAuthorsA.M. Krystan, T.A. Gowan, William L. Kendall, Julien Martin, J.G. Ortega-Ortiz, K.B. Jackson, A.R. Knowlton, P. Naessig, M. Zani, D.W. Schulte, C.R. Taylor - Software
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