Research Scientist / Migratory Bird Center
Brandt is interested in understanding the factors that influence adaptive behavioral variation, individual fitness, and population dynamics. His research uses birds as a model system to answer questions about movement ecology, sexual selection, social behavior and population demography. Dr. Ryder's research program spans both North and South America. In southern Indiana, Brandt leads a landscape scale study examining the local and landscape factors which, are driving the population dynamics of a declining neotropical migrant, the wood thrush. On the Channel Islands, Dr. Ryder collaborates with Dr. Sillett to answer questions about how the social environment of island scrub-jays influences dispersal and recruitment. Finally, Brandt collaborates with Dr. Marra on questions about how the novel selection pressures associated with urbanization impact avian vital rates and mate choice. In Ecuador, Dr. Ryder continues a long-term study of the reproductive and social behavior of a cooperative lek-breeding bird, the wire-tailed manakin. Brandt recently received NSF support to examine the proximate links between individual variation in hormone-signaling pathways, behavioral phenotype and social network structure. Future work in South America will focus on the non-breeding ecology of neotropical migrant birds wintering in intact primary forest vs. agro-ecosystems (e.g., shade grown cacao and coffee).
Evans, Brian S., Ryder, Thomas B., Reitsma, Robert, Hurlbert, Allen H. and Marra, Peter P. Characterizing avian survival along a rural-to-urban land use gradient, Ecology, 96 (6) 1631-1640. 2015.
Stanley, Calandra Q., Mckinnon, Emily A., Fraser, Kevin C., Macpherson, Maggie P., Casbourn, Garth, Friesen, Lyle, Marra, Peter P., Studds, Colin E., Ryder, Thomas B., Diggs, Nora E. and Stutchbury, Bridget J. M. Connectivity of Wood Thrush Breeding, Wintering, and Migration Sites Based on Range-Wide Tracking: Wood Thrush Migration Networks, Conservation Biology, 29 (1) 164-174. 2015.
Mokross, Karl, Ryder, Thomas B., Côrtes, Marina Corrêa, Wolfe, Jared D. and Stouffer, Philip C. Decay of interspecific avian flock networks along a disturbance gradient in Amazonia, Proceedings of the Royal Society B: Biological Sciences, 281 (1776) . 2014.
Rushing, Clark Sawyer, Ryder, Thomas B., Saracco, James Frederick and Marra, Peter P. Assessing migratory connectivity for a long-distance migratory bird using multiple intrinsic markers, Ecological Applications, 24 (3) 445-456. 2014.
Fair, Jeanne M., Ryder, Thomas B., Loiselle, Bette A., Blake, John G., Larson, Toti E., Davis, Paul, Syme, James, Perkins, George B. and Heikoop, Jeffrey M. Estimates of dietary overlap for six species of Amazonian manakin birds using stable isotopes, Isotopes in Environmental and Health Studies, 49 (3) 420-435. 2013.