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ing and Indexing: Articles appearing in The Auk: Ornithological Advances are abstracted and indexed in the databases listed online at www.aoucospubs. org/page/mission. The Auk: Ornithological Advances (ISSN 0004-8038, e-ISSN 1938-4254) is published online weekly by the American Ornithologists’ Union and the Cooper Ornithological Society at www.aoucospubs. org. Periodicals postage paid at Waco, TX and at additional mailing offices. POSTMASTER: Send address changes to The Auk: Ornithological Advances, OSNA Business Office, 5400 Bosque Blvd., Suite 680, Waco, TX 76710; business@osnabirds.org. Printed quarterly by Allen Press on Forest Stewardship Council® certified paper. The Auk: Ornithological Advances, Volume 132, Number 3, July 2015. ©2015 American Ornithologists’ Union. All rights reserved. The American Ornithologists’ Union THE COUNCIL FOR 2014–2015 OFFICERS President: Scott M. Lanyon, Department of Ecology, Evolution, and Behavior, University of Minnesota, 1987 AND EDITORS Upper Buford Circle, St. Paul, MN 55108, lanyo001@umn.edu President-Elect: Steven R. Beissinger, Division of Ecosystem Science, University of California-Berkeley, 130 Mulford Hall #3114, Berkeley, CA 94720, beis@berkeley.edu Secretary: Andrew W. Jones, Department of Ornithology, Cleveland Museum of Natural History, 1 Wade Oval Drive, University Circle, Cleveland, OH 44106, ajones@cmnh.org Treasurer: James R. Herkert, Illinois Department of Natural Resources, One Natural Resources Way, Springfield, IL 62702, james.herkert@illinois.gov Editor-in-Chief of The Auk: Ornithological Advances: Mark E. Hauber, Department of Psychology, Hunter College, City University of New York, 628C Hunter North, 695 Park Avenue, New York, NY 10021, mark.hauber@hunter.cuny. edu Executive Director: Melinda Pruett-Jones, 1400 S. Lake Shore Drive, Chicago, IL 60605, mpruettjones@gmail.com AOU Administrator: Crystal Ruiz, 1400 S. Lake Shore Drive, Chicago, IL 60605, aoubusinessmanager@gmail.com AOU Membership Database Manager: Scott W. Gillihan, 5405 Villa View Drive, Farmington, NM 87402, aoumembership@gmail.com ELECTIVE 2015: Daniel R. Ardia, Maria Del Coro Arizmendi, Rebecca T. Kimball, Jorge L. Pérez-Emán COUNCILORS 2016: David N. Bonter, Kevin J. Burns, Deborah M. Finch, Patricia J. Heglund 2017: Colleen M. Handel, James W. Rivers, Rebecca J. Safran, David W. Winkler LIVING PAST Susan M. Haig (2012–2014), John Faaborg (2010–2012), Edward H. Burtt, Jr. (2008–2010), Erica H. Dunn PRESIDENTS (2006–2008), James A. Kushlan (2004–2006), Fred Cooke (2002–2004), John W. Fitzpatrick (2000–2002), Frank B. Gill (1998–2000), Richard C. Banks (1994–1996), Brina Kessel (1992–1994), Frances C. James (1984–1986), Wesley E. Lanyon (1976–1978) MEMBERSHIP Persons interested in birds are invited to join the American Ornithologists’ Union. Regular membership costs $75 per year; student memberships are $28. Membership is $28 for persons in all countries except the United States, Canada, Israel, Japan, Australia, New Zealand, and the following Western European countries: Iceland, Norway, Sweden, Finland, Denmark, Germany, The Netherlands, Belgium, Luxembourg, France, the United Kingdom, Ireland, Switzerland, Austria, Italy, Spain, and Portugal. All members receive access to the online version of The Auk: Ornithological Advances and the bimonthly Ornithological Newsletter. Quarterly print versions of The Auk: Ornithological Advances can be ordered by members for $30/year. A life membership is $2,600, paid in one sum or four annual installments of $650. Individuals may join, renew memberships, and report changes of address through the Ornithological Societies of North America (OSNA): www.osnabirds.org; business@osnabirds.org; 5400 Bosque Blvd., Suite 680, Waco, TX 76710. Gifts of any amount for the Endowment Fund are welcome and should be sent to AOU, c/o Schneider Group, 5400 Bosque Blvd., Suite 680, Waco, TX 76710. Gifts to the AOU are tax-deductible to the extent permitted by law. INSTITUTIONAL The Ornithological Societies of North America (OSNA) handles institutional subscriptions: (254) 399-9636, SUBSCRIPTIONS business@osnabirds.org. See www.osnabirds.org for single-issue and subscription orders, claims information, and mail dates. Domestic claims for nonreceipt of issues should be made within 90 days of the mail date; overseas claims within 180 days. AmericanOrnithology.org The Auk: Ornithological Advances, Volume 132, Number 3, July 2015. ©2015 American Ornithologists’ Union. All rights reserved. Volume 132, Issue 3, July 2015 DOI: 10.1642/AUK-2015.132. 3.toc