Articles

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An Assessment of Song Admixture as an Indicator of Hybridization in Black-capped Chickadees (Poecile atricapillus) and Carolina Chickadees (Poecile carolinensis) (with Patricia Sawaya and Michael J. Braun), The Auk (2007)

Vocal admixture often occurs where differentiated populations or species of birds meet. This may entail...

 

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Reproductive Success Across the Black-capped Chickadee (Poecile atricapillus) and Carolina Chickadee (P. carolinensis) Hybrid Zone in Ohio (with C. L. Bronson; Thomas C. Grubb, Jr.; and Michael J. Braun), The Auk (2005)

Black-capped Chickadees (Poecile atricapillus) and Carolina Chickadees (P. carolinensis) hybridize in an east-west band from...

 

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Mate Preference: a Possible Causal Mechanism for a Moving Hybrid Zone (with C. L. Bronson; Thoams C. Grubb, Jr.; and Michael J. Braun), Animal Behavior (2003)

The study of patterns and underlying mechanisms within hybrid zones may provide insight into speciation....

 

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Morphometric Variation as an Indicator of Genetic Interactions between Black-capped and Carolina Chickadees at a Contact Zone in the Appalachian Mountains (with Michael J. Braun), The Auk (2000)

We studied hybridization and introgression between Black-capped (Poecile atricapillus) and Carolina (P. carolinensis) chickadees along...

 

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The Dynamics of Vocal, Morphological and Molecular Interaction between Hybridizing Black-Capped and Carolina Chickadees, Faculty Dissertations (1996)

Previous investigation of genetic interactions between black-capped and Carolina chickadees (Parus atricapillus and P. carolinensis)...

 

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Reliability of Counts of Migrating Raptors: an Experimental Analysis (with Jonathan Bart), Journal of Field Ornithology (1984)
 

Contributions to Books

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Preliminary Survey of Autumn Hawk Migration in the Inner Piedmont of Virginia (with Jamie Perdue, Daryl Rich, and Matthew Zagorski), Hawkwatching in the Americas (2001)

A hawkwatch was conducted in September 1997-1999 in the Inner Piedmont of Virginia near Lynchburg,...

 

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A Technique for Evaluating Observer Efficiency in Raptor Migration Counts (with Jonathan Bart), Proceedings of Hawk Migration Conference IV (1985)

A technique is described for sampling sections of the sky individually during a raptor migration...