Second North American Sea Duck Conference - Patuxent Wildlife ...

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SECOND NORTH AMERICAN SEA DUCK CONFERENCE ABSTRACTS FOR HABITAT PRESENTATIONS 10 ANNAPOLIS, MARYLAND, USA NOV. 7-11, 2005
SECOND NORTH AMERICAN SEA DUCK CONFERENCE POPULATION DELINEATION, WINTER HABITAT USE AND TIMING OF SPRING MIGRATION OF SURF SCOTERS FROM THE SOUTHERN PORTION OF THEIR WINTER RANGE David H. Ward 1 , Daniel J. Rizzolo 1 , Sharon Herzka 2 , Marnie L. Shepherd 1 , Eduardo Carrera- González, 3 and Daniel Esler 4 1Alaska Science Center, U. S. Geological Survey, 1011 E. Tudor Road, Anchorage, Alaska 99503; david_ward@usgs.gov 2Department of Biological Oceanography, Center for Scientific Investigations and Higher Education, Ensenada, Baja California, Mexico 22860 3<strong>Duck</strong>s Unlimited de Mexico, Ave. Vasconcelos 209 Ote., Residencial San Agustin, Garza Garcia, Nuevo Leon, Mexico 4Centre for <strong>Wildlife</strong> Ecology, Simon Fraser University, Burnaby, British Columbia An estimated 60,000 surf scoters (Melanitta perspicillata) winter along the Pacific coast of Mexico and southern California, yet little information exist about their ecology in this region. In winter of 2004- 2005, a pilot study was initiated to test the feasibility of capturing and marking scoters with VHF and satellite transmitters in Baja California to gain a more complete delineation of the winter population structure, migration routes and patterns, and breeding distribution of surf scoters in the Pacific Flyway. We present results of complimentary research on the diet, habitat use patterns, migration chronology and linkages between wintering and breeding areas for this overlooked segment of the surf scoter population. In mid-February we captured 21 surf scoters with floating mist nets and marked 5 adult females with satellite transmitters and 8 adults (3F, 5M) and 6 juveniles (3F, 3M) with VHF transmitters in San Quintin Bay, Baja California. Radio-marked scoters primarily used this bay during daylight hours and nearly all moved
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Allard, Karel 5, 62 Anderson, Eric
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