Professor, Department of Biology
University of Maryland
Ph.D., 1996, University of Washington
|Address:||3235 Biology-Psychology Building |
University of Maryland
College Park, MD 20742
My research involves meshing field research with theoretical models to address critical questions in community ecology and conservation biology. I believe that ecological theory will be strengthened if it is forced to help solve real-world problems, and that conservation biology involves difficult choices that demand quantitative approaches.
Several ongoing research areas illustrate this melding of theory and problem solving:
To understand the complex ecological consequences of habitat fragmentation, I combine mathematical theory with empirical databases and/or field experiments to explore how landscape heterogeneity and patchiness can influence population and community dynamics. My interests in this area are diverse, including such issues as spatial subsidies, species’ home ranges and migratory movements, spatial aspects of successional change, and edge-mediated effects. Ultimately, I'm interested in how spatial effects influence the assembly, collapse, and functioning of ecological systems, and I try to understand these relationships by working at the interface of data and theory. Research on this topic involves field work in some amazing parts of the world, including the Eastern Steppes of Mongolia, the Antarctic Peninsula, and the starkly beautiful Pumice Plains of Mt. St. Helens, Washington.
Funded Research Projects:
NSF Advances in Biological Informatics: "Informatics tools for population-level animal movements." with T. Mueller, P. Leimgruber, A. Royle, and J. Calabrese. Thomas Mueller, an Assistant Research Scientist in my lab, leads this project. Also on this grant, postdoc Chris Fleming is investigating theoretical aspects of animal foraging and statistical issues associated with empirical data on animal movements. This project is developing innovative data management and analysis tools that will allow scientists and conservation managers to use animal relocation and tracking data to study movement processes at the population-level, focusing on the interrelationship of multiple moving individuals. We are developing and testing these new tools using datasets on Mongolian gazelles, whooping cranes, and blacktip sharks. More information is available on the Movement Dynamics Homepage.
NSF LTREB: “Collaborative Research: Impacts of Insect Herbivory on the Pace and Pattern of Successional Change at Mount St. Helens” with John Bishop and Charlie Crisafulli. My PhD students Chris Che-Castaldo and Elise Larsen are working on this project. We are focusing on the ways insect herbivores are influencing the ecological recovery of the volcano Mount St. Helens through their impacts on early colonizing plant species (lupines and willows). Previous work by my collaborators and I on the spatial dynamics of recovery at Mount St. Helens was recognized with the Presidential Award from the American Society of Naturalists. More information is available on the Mount St. Helens Research Portal.
NSF Population Biology: “Collaborative Research: QEIB: Resource Predictability and Dispersal Strategies in Ungulates: Does Temporal Uncertainty Lead to Nomadism?” with Todd Fuller and Peter Leimgruber. My former PhD student Thomas Mueller worked on this project. We used a combination of field studies (satellite collars on Mongolian gazelles) and computational modeling (individual-based neural-network genetic algorithm models) to explore the spatial factors that influence the evolution and persistence of home ranges, nomadism, and migratory movements across taxa.
James S. McDonnell Foundation: “A Complex System Perspective of Transport in River Networks: Implications for Biodiversity and Water-borne Diseases.” with Ignacio Rodriguez-Iturbe. My postdoc Heather Lynch and my lab associate Evan Grant contributed to aspects of this project. This project focuses on the ways in which the branching geometry of river networks (as opposed to ‘2-D’ planar landscapes) influences population dynamics, species interactions, and biogeography.
NSF Antarctic Research: Collaborative Research: Multispecies, Multiscale Investigations of Longterm Changes in Penguin & Seabird Populations on the Antarctic Peninsula. My previous postdoc Heather Lynch was in charge of this project, and several graduate students in my lab travel to Antarctica each year as part of the effort. My graduate student Paula Casanovas pursued a dissertation on related topics involving Antarctic lichens. We are focusing on the compilation of a biodiversity monitoring database for the Antarctic Peninsula that we will use to evaluate alternative hypotheses for long-term changes in penguin and seabird population sizes. The Oceanites Foundation and NASA provided additional support for this project.
Ecoinformatics, biodiversity databases, and conservation planning
To strengthen the science of conservation biology, I work to devise a) quantitative methods for extracting useful biodiversity data from minimalist data sets, and b) mathematical models that assess the adequacy of conservation goals by focusing on the regional dynamics of archetypal, indicator species. An often forgotten key to such models is that they be simple enough that the appropriate data can actually be collected in the field. My interests in the science of conservation are diverse, and I have been involved in projects ranging from reserve planning, to spatial analyses of extinction risk in desert fishes, to time-series analyses of extinction risk, to reviews of endangered species recovery plans. In 2001, I received a Guggenheim Fellowship for support of my research in these areas for a project entitled: “The Weak Data Problem in Conservation Biology.”
Funded Research Projects:
NSF Advances in Biological Informatics: "Informatics tools for population-level animal movements." with T. Mueller, P. Leimgruber, A. Royle, and J. Calabrese. Thomas Mueller, an Assistant Research Scientist in my lab, leads this project. Also on this grant, postdoc Chris Fleming is investigating theoretical aspects of animal foraging and statistical issues associated with empirical data on animal movements. This project is developing innovative data management and analysis tools that will allow scientists and conservation managers to use animal relocation and tracking data to study movement processes at the population-level, focusing on the interrelationship of multiple moving individuals. We are developing and testing these new tools using datasets on Mongolian gazelles, whooping cranes, and blacktip sharks.
Dept. of Defense SERDP: “An Ecoinformatic Approach to Quantifying Recovery Goals for Endangered Species” with Maile Neel. My postdocs Sharon Bewick, Yanthe Pearson, and Emma Goldberg and my PhD student Elise Larsen worked on this project. In this project, we are using a database approach to study how conservation knowledge about well-studied species can be used to inform conservation efforts for lesser-known species.