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Subspecific Identity, Population Genetic Structure, and Status of Gull-billed Terns Throughout Their North American Breeding Range
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There are two North American subspecies of gull-billed terns, medium-sized waterbirds with thick, black bills. Hunted for their feathers in the early 1900s, population numbers are currently affected by limited resources, such as suitable habitat and food. Fewer than 800 pairs of one subspecies inhabit their western range from southern California to Mexico. The eastern subspecies, which lives along the Atlantic and Gulf coasts, is more numerous but may also be experiencing population declines. The small population sizes, limited distribution, and high threats escalate the need to clarify the taxonomic and conservation status of gull-billed terns, and in particular, the western subspecies. The USGS will use genetic techniques to define the status and population structure throughout the North American range.
Haig, Susan M. - Supervisory Research Wildlife Biologist
Phone: 541-750-7482
Email: susan_haig@usgs.gov
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