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vii BRAD A. ANDRES U.S. Fish and Wildlife Service P.O. Box 25486, DFC Denver, CO 80225-0486, USA brad_andres@fws.gov LINDSAY A. ARMER Environment and Conservation Indian and Northern Affairs Canada 4914–50 Street, 10th Floor Bellanca Building P.O. Box 1500 Yellowknife, NT X1A 2R3, Canada linds.armer@mac.com JONATHAN BART U.S. Geological Survey Forest and Rangelands Ecosystem Science Center 970 Lusk Street Boise, ID 83706, USA jon_bart@usgs.gov STEPHEN BROWN Manomet Center for Conservation Sciences P.O. Box 1770 Manomet, MA 02345, USA sbrown@manomet.org BRIAN T. COLLINS National Wildlife Research Centre Canadian Wildlife Service Environment Canada 1125 Colonel By Drive Ottawa, ON K1A 0H3, Canada brianandhelencollins@sympatico.ca GARRY DONALDSON Canadian Wildlife Service Environment Canada 351 St. Joseph Boulevard Gatineau, QC K1A 0H3, Canada garry.donaldson@ec.gc.ca KYLE H. ELLIOTT Department of Biology University of Manitoba Winnipeg, MB R3T 2N2, Canada haliaeetus@gmail.com CHARLES M. FRANCIS National Wildlife Research Centre Canadian Wildlife Service Environment Canada 1125 Colonel By Drive Ottawa, ON K1A 0H3, Canada charles.francis@ec.gc.ca VICTORIA JOHNSTON Environment Canada P.O. Box 2310 5019–52 Street, 4th Floor Yellowknife, NT X1A 2P7, Canada vicky.johnston@ec.gc.ca DAVID J. KRUEPER U.S. Fish and Wildlife Service Migratory Bird Program P. O. Box 1306 Albuquerque, NM 87103, USA dave_krueper@fws.gov CONTRIBUTORS STUDIES IN AVIAN BIOLOGY NO. 44 Bart and Johnston viii CRAIG S. MACHTANS Canadian Wildlife Service Environment Canada P.O. Box 2310 5019–52 Street, 4th Floor Yellowknife, NT X1A 2P7, Canada craig.machtans@ec.gc.ca ANN MANNING U.S. Geological Survey Forest and Rangelands Ecosystem Science Center 970 Lusk Street Boise, ID 83706, USA (Current address: 520 East Ash Street, Caldwell, ID 83605, USA, manning_ann@yahoo.com) BRIAN J. MCCAFFERY U.S. Fish and Wildlife Service Yukon Delta National Wildlife Refuge P.O. Box 346 Bethel, AK 99559, USA brian_mccaffery@fws.gov R. I. G. MORRISON National Wildlife Research Centre Canadian Wildlife Service Environment Canada 1125 Colonel By Drive Ottawa, ON K1A 0H3, Canada guy.morrison@ec.gc.ca ELIN P. PIERCE 1134 Santa Luisa Drive Solana Beach, CA 92075, USA elpier@roadrunner.com LISA PIRIE Canadian Wildlife Service Environment Canada P.O. Box 1714 Qimugjuk Building 969 Iqaluit, NU X0A 0H0, Canada lisa.pirie@ec.gc.ca ROBERT PLATTE U.S. Fish and Wildlife Service Migratory Bird Management 1011 East Tudor Road Anchorage, AK 99503-6199, USA bob_platte@fws.gov JENNIE RAUSCH Canadian Wildlife Service Environment Canada P.O. Box 2310 5019–52 Street, 4th Floor Yellowknife, NT X1A 2P7, Canada jennie.rausch@ec.gc.ca SUSAN K. SKAGEN U.S. Geological Survey Fort Collins Science Center 2150 Center Avenue, Building C Fort Collins, CO 80526-8118, USA susan_skagen@usgs.gov PAUL A. SMITH Smith and Associates Ecological Research Ltd. 772 – 7th Conc South Pakenham, ON K0A 2X0, Canada paul_smith@smitheco.ca CATHERINE WIGHTMAN Montana Fish, Wildlife & Parks 1420 East Sixth Avenue P.O. Box 200701 Helena, MT 59620-0701, USA cwightman@mt.gov ...

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