<p style="font-size: 9pt">Last updated: 2019-09-20</p>

Michael T. Hallworth, Ph.D.



2019-         Postdoctoral Fellow - Northeast Climate Adaptation Science Center, University of Massachusetts, Amherst, MA.

2015-2018 Postdoctoral research associate - Smithsonian Conservation Biology Institute - Migratory Bird Center, Washington, D.C.

2014-2015 Postdoctoral research associate - University of Maryland, Baltimore County, Baltimore, MD. Geography & Environmental Systems


Ph.D., Environmental Science and Public Policy, 2014. George Mason University, Fairfax, VA.
Advisors: Dr. Peter P. Marra & Dr. Larry Rockwood

M.S., Biology, 2007. Plymouth State University, Plymouth, NH.
Advisor: Dr. Leonard Reitsma

B.S., Biology, 2004. Plymouth State University, Plymouth, NH.
Minor: Chemistry

Career Highlights

24 peer-reviewed publications
h-index = 10
i10-index = 10
total citations = 336
Over $305,000 in competitive grants
Best Dissertation Award, 2014-2015


  • Ecological Responses to Climate Change (ECO 691E) - University of Massachusetts Amherst - Fall 2019
  • Get spatial! Using R as GIS - 2018, 2019
  • Modelling Occupancy and Abundance - Guest lecture - University of Delaware - 2016
  • Light-level geolocation using open source tools - workshop co-instructor - 2015
  • Spatial Patterns in Richness and Abundance - Guest lecture - University of Maryland, Baltimore County - 2015
  • Entomology & Wildlife Ecology R Lunch - University of Delaware - 2015
  • Modeling Occupancy and Abundance - lecture - Smithsonian Conservation Biology Institute - 2015
  • Modeling Occupancy and Abundance - lab - Smithsonian Conservation Biology Institute - 2015
  • Spatial Analyses in R - Guest lecture - University of Maryland, Baltimore County - 2015
  • R markdown - Guest lecture - University of Maryland, Baltimore County - 2015
  • New Technologies in the study of migration - lecture - Smithsonian Conservation Biology Institute - 2014, 2015
  • Geolocator Analysis - lab - Smithsonian Conservation Biology Institute - 2014,2015
  • Geolocator Analysis - lab - University of Maryland, Baltimore County - 2014
  • Principles in Ecology and Evolution - lab (BIOL 308) - George Mason University - 2012-2013
  • Ecology - lab (BIOL 307) - George Mason University - 2009-2011
  • Human Anatomy and Physiology - lab (BIOL 124) - George Mason University - 2008
  • Tropical Ecology - co-taught course in Puerto Rico - Plymouth State University - 2008
  • Introduction to Biology -lecture (BIOL 1010) - Plymouth State University - 2007
  • Field Ecology for High School Teachers - co-instructor - New England Institute for Landscape Ecology - 2005,2006

Awards / Grants

  • International Research Partnership Award from Wings Across the Americas, 2019 - Migratory Dragonfly Partnership
  • Smithsonian Institution's Competitive Grants Program, 2018 - Sillett, T. S. & M. T. Hallworth - $55,744
  • Smithsonian Institution's Competitive Grants Program, 2017 - Sillett, T. S., T. B. Ryder & M. T. Hallworth - $54,000
  • Postdoctoral Travel Award - AOS:SCO 2017 Joint Meeting, 2017 - M. T. Hallworth - $320
  • Envtl. Science and Public Policy's best PhD dissertation award, 2014/15- George Mason University - M. T. Hallworth - $100
  • Dissertation Completion Grant- Spring, 2014 - George Mason University- M. T. Hallworth - $8,000
  • Travel Award - AOU:COS:SCO 2014 Joint Meeting, 2014 - M. T. Hallworth - $330
  • Smithsonian Institution's Competitive Grants Program, 2012 - Marra, P. P. & M. T. Hallworth - $33,821
  • Max and Vera Britton Environmental Science Award, The Trustees of the Cosmos Club Foundation, 2012
  • Cosmos Scholar, 2012, M. T. Hallworth - $2,500
  • Alexander Wetmore Research Award, American Ornithological Union, 2012 - M. T. Hallworth - $2,500
  • Visiting Student Fellow, Smithsonian Institution, 2010 - $5,000
  • Smithsonian Endowment Bond 2010 - Marra, P.P. and M. T. Hallworth - $49,860
  • Golden Key International Honour Society, 2009
  • Graduate teaching assistantship - George Mason University, 2008-2013
  • Who's Who Among College Students Award, 2008
  • Who's Who Among College Students Award, 2003
  • U.S. Army Reserve National Scholar/Athlete Award, 2001

Professional Service

  • ECo's Workplace Climate, Diversity, Inclusion, and Equity Committee, Chair. University of Massachusetts Amherst
  • Early Career Professional Committee, American Ornithological Society
  • Reviewer for: National Science Foundation (Division of Environmental Biology), The Wilson Journal of Ornithology, Auk: Ornithological Advances, Condor: Ornithological Applications, Journal of Forest Ecology and Management, Journal of Field Ornithology, Journal of Avian Biology, Proceedings of the California Channel Islands Symposium, Behavioral Ecology, European Journal of Wildlife Research, Avian Conservation and Ecology, Ecological Monographs, Oecologia, Animal Migration, Molecular Ecology, Journal of Caribbean Ornithology, Ibis, Froniters in the Ecology and Evolution, Journal of Ornithology


  1. Odom, K. J., E. M. Shank, M. T. Hallworth, O. A. Diaz-Marrero and K. E. Omland. in press. Females and males maintain similar sized, stable territories between the breeding and non-breeding seasons in a tropical oriole (Icterus icterus). Wilson Journal of Ornithology.

  2. Brlik, V., J. Kolecek, M. Burgess, S. Hahn, M. Krist, J. Ouwehand, E. L. Weiser, P. Adamik, J. A. Alves, D. Arlt, S. Barisic, D. Becker, E. J. Belda, V. Beran, C. Both, S. P. Bravo, M. Briedis, B. Chutny, D. Cikovic, N. W. Cooper, J. S. Costa, V. R. Cueto, T. Emmenegger, K. Fraser, O. Gilg, M. Guerrero, M. T. Hallworth, C. Hewson, D. Humple, F. Jiguet, J. Johnson, T. Kelly, D. Kishkinev, M. Leconte, T. Lislevand, S. Lisovski, C. Lopez, K. MacFarland, P. P. Marra, S. M. Matsuoka, P. Matyjasiak, C. M. Meier, B.n Metzger, J. S. Monros, R. Neumann, A. Newman, R. Norris, T. Part, V. Pavel, N. Perlut, M. Piha, J. Reneerkens, C. Rimmer, A. Roberto-Charron, C. Scandolara, N. Sokolova, M. Takenaka, D. Tolkmitt, H. van Oosten, A. Wellbrock, H. Wheeler, J. van der Winden, K. Witte, B. Woodworth, P. Prochazka. 2019. Weak effects of geolocators on small birds: a meta-analysis controlled for phylogeny and publication bias. Journal of Animal Ecology. 0 0:1-14. https://doi.org/10.1111/1365-2656.12962

  3. Van Tatenhove, A., E. Filiberti, N. L. Rodenhouse, T. S. Sillett, and M. T. Hallworth. 2019. Migratory songbird and rodent distribution shifts correspond with spring temperatures in northern temperate forests. Forests https://doi.org/10.3390/f10020084

  4. Jahn, A. E., J. Cereghetti, V. R. Cueto, M. T. Hallworth D. J. Levey, M. A. Marini, D. Masson, M. A. Pizo, J. H. Sarasola, and D. T. Tuero. 2019. Breeding latitude predicts timing but not rate of spring migration in a widespread migratory bird in South America. Ecology and Evolution. https://doi.org/10.1002/ece3.5159


  5. Lisovski, S., S. Bauer, M. Briedis, S. C. Davidson, K. L. Dhanjal-Adams, M. T. Hallworth, J. Karagicheva, C. M. Meier, B. Merkel, J. Ouwehand, L. Pedersen, E. Rakhimberdiev, A. Roberto-Charron, N. E. Seavy, M. D. Sumner, C. M. Taylor, S. J. Wotherspoon, and E. S. Bridge. 2019. Light-level geolocator analyses: A user's guide. Journal of Animal Ecology. https://doi.org/10.1111/1365-2656.13036

  6. Tonra, C. M., M. T. Hallworth, T. J. Boves, L. P. Bulluck, M. Johnson, C. Viverette, E. M. Ames, A. Matthews, J. Resse, M. C. Slevin, R. R. Wilson and E. I. Johnson. 2019. Range-wide migratory connectivity estimation reveals concentration of a widespread breeding population in few critically important nonbreeding locations. Journal of Avian Biology. Editor's choice

  7. Hallworth, M. T., P. P. Marra, K. E. McFarland, S. Zahendra and C. E. Studds. 2018. Tacking dragons: Stable isotopes reveal the annual cycle of a long-distance migratory insect. Biology Letters. Cover article

  8. Cohen, E. B., C. R. Rushing, F. R. Moore, M. T. Hallworth, J. A. Hostetler, M. Gutierrez Ramirez and P. P. Marra. 2018. Spatial and temporal en route migratory connectivity of three Nearctic-Neotropical species through the Gulf Of Mexico region. Ecography.

  9. Lisovski, S., H. Schmaljohann, E. S. Bridge, S. Bauer, A. Farnsworth , S. A. Gauthreaux, Jr., S. Hahn, M. T. Hallworth, C. M. Hewson, J. F. Kelly, F. Liechti, P. P. Marra, E. Rakhimberdiev, J. D. Ross, N. E. Seavy, M. D. Sumner, C. M. Taylor, D. W. Winkler, S. J. Wotherspoon, and M. B. Wunder. Inherent limits of light-level geolocation may lead to over-interpretations (Comment on Streby et al. (2015) Tornadic Storm Avoidance Behavior in Breeding Songbirds. Curr. Biol. 25, R98-R102.). 2018. Current Biology. 28:3. R99-R100.

  10. Cohen, E. B., J. Hostetler, M. T. Hallworth, C. Rushing, T. S. Sillett and P. P. Marra. 2018. A quantitative definition for the strength of migratory connectivity. Methods in Ecology and Evolution. 9:3. 513-524.

  11. Reitsma, L. R., J. J. Jukosky, A. J. Kimiatek, M. L. Goodnow, and M. T. Hallworth. 2018. Extra-pair paternity in a long-distance migratory songbird beyond neighbors' borders and across male age classes. Canadian Journal of Zoology. 96:1. 49-54. https://doi.org/10.1139/cjz-2016-0277.

  12. Hache, S. E.M. Bayne, M.A. Villard, H. Proctor, C.S. Davis, D. Stralberg, E. Vasi, A. Grossi, J.C. Gorrell, J.K. Janes, M. T. Hallworth, K.R. Foster and R. Krikun. 2017. Phylogeography of a migratory songbird across its Canadian breeding range: implications for conservation units. Ecology and Evolution. 7:6078-6088. https://doi.org/10.1002/ece3.3170.

  13. Cooper, N. W., M. T. Hallworth and P. P. Marra. 2017. Light-level geolocation reveals wintering distribution, migration routes, and primary stopover locations of an endangered long-distance migratory songbird. Journal of Avian Biology. 48:2. 209-219. Cover article.

  14. Hallworth, M. T. and P. P. Marra. 2015. Miniaturized GPS Tags Identify Non-breeding territories of a small breeding migratory songbird. Scientific Reports. 5:11069. doi:10.1038/srep11069.

  15. Hallworth, M. T., T. S. Sillett, S. J. Van Wilgenburg, K. A. Hobson and P. P. Marra. 2015. Migratory connectivity of a Neotropical migratory songbird revealed using archival light-level geolocators. Ecological Applications. http://dx.doi.org/10.1890/14-0195.1

  16. Hallworth, M. T., C. E. Studds, T. S. Sillett and P. P. Marra. 2013. Do archival light-level geolocators and stable-hydrogen isotopes provide comparable estimates of breeding ground origin? Auk 130(2): 273-282.

  17. Hallworth, M. T., L. Reitsma and K. Parent. 2011. Habitat- and spatial use of the Louisiana Waterthrush during the non-breeding season in the Caribbean National Forest, Puerto Rico. Wilson Journal of Ornithology 123(3): 567-574.

  18. Reitsma, L, M. Goodnow, M. T. Hallworth and C. J. Conway. 2010. Canada Warbler (Wilsonia canadensis), The Birds of North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology

  19. Hallworth, M., K. Parent and L. Reitsma 2009. Modified version of the leg harness technique for mounting radio transmitters. North American Bird Bander. 34(2): 50-53.

  20. Hallworth, M., A. Ueland, E. Anderson, J.D. Lambert and L. Reitsma. 2008. Habitat selection and site fidelity of the Canada warbler (Wilsonia canadensis) in central, New Hampshire. Auk 125(4): 880-888.

  21. Reitsma L., M. Hallworth, P. Benham. 2008. Does age influence territory size, habitat selection and reproductive success of male Canada warblers (Wilsonia canadensis) in central New Hampshire? Wilson Journal of Ornithology 120(3): 446-454.

  22. Hallworth, M., P. Benham, J. D. Lambert, and L. Reitsma. 2008. Canada warbler (Wilsonia canadensis) breeding ecology in young forest stands compared to red maple (Acer rubrum) swamp. Forest Ecology and Management 255, 1353-58.

  23. Elander M., A. Blackstone, C. Cleary, H. Clogston, M. Hallworth, H. Jardin, J. Kornfeld, K. Parent, Z. Johnson, K. Donahue L. Reitsma, 2006. Community-based conservation in East Africa: a case study of Ndarakwai ranch, Tanzania. Interdisciplinary Environmental Review 8(1): 89-95.

  24. Elander M., A. Blackstone, C. Cleary, H. Clogston, M. Hallworth, H. Jardin, J. Kornfeld, K. Parent, Z. Johnson, K. Donahue L. Reitsma, 2005 Community-based conservation in East Africa: A case study of western Usambara Mountains, Tanzania. Interdisciplinary Environmental Review 7(2): 60-75.

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    Back to top ### **Thesis & Dissertation**

    Hallworth, M. T. 2014. The influence of migratory connectivity and seasonal interactions on individual- and population-level dynamics of a long distance migratory bird. Dissertation. George Mason University, Fairfax, VA. Advisors: Peter P. Marra and Larry L. Rockwood

    Hallworth, M. 2007. The breeding ecology of the Canada warbler in central New Hampshire. Thesis. Plymouth State University, Plymouth, NH. Advisor: Leonard R. Reitsma

    ### **Software**

    Hostetler, J., M. T. Hallworth and C. S. Rushing. 2018. MigConnectivity: Estimate Strength of Migratory Connectivity for Migratory Animals. R package version 0.2.5. https://github.com/SMBC-NZP/MigConnectivity v0.2.5 (Version v0.2.5). Zenodo. http://doi.org/10.5281/zenodo.1162943

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