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habitat selection, the ecology and evolution of migration, interspecific interaction, and use of man-modified tropical habitats.
Greenberg, R., Olsen, B., Ballentine, B., Warner, S. and Danner, R. Temporal distribution of the Coastal Plain Swamp Sparrow: The importance of subspecies identification, Birding, 40 42-49. 2008.
Olsen, B., Greenberg, R., Fleischer, R. and Walters, J. Extrapair paternity in the swamp sparrow, Melospiza georgiana: Male access or female preference?, Behavioural Ecology and Sociobiology, 63 (2) 285-294. 2008.
Dietsch, T.V., Perfecto, I. and Greenberg, R. Avian foraging behavior in two different types of coffee agrosystem in Chiapas, Mexico, Biotropica, 39 232-240. 2007.
Greenberg, R., Marra, P.P. and Wooler, M. Stable isotope (C, N, H) analyses locate the unknown winter range of the coastal plain swamp sparrow (Melospiza georgiana nigrescens), The Auk, 124 1137-1148. 2007.
Philpott, S.M., Bichier, P., Rice, R. and Greenberg, R. Field-testing ecological and economic benefits of coffee certification programs, Conservation Biology, 21 (4) 975-985. 2007.
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