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Long-term Monitoring of Bird Populations
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Riparian (streamside) vegetation provides habitat for breeding, migrating, and overwintering birds, and is also critical to the quality of the in-stream habitat on which salmon fisheries and other aquatic species depend. In the western United States, riparian zones make up less than 0.5% of the total land
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Vesper Sparrow © Jim Livaudais |
Vesper Sparrows (Pooecetes gramineus) are found throughout the northern half of North America and Canada. In the Pacific Northwest, breeding populations of Oregon Vesper Sparrow (Pooecetes gramineus affinis), one of four subspecies, historically spanned from southwest British Columbia, western Washington and Oregon, to northwestern California. Breeding Oregon Vesper Sparrows have been extirpated from British Columbia and northwestern California. Due to these dramatic declines, the subspecies has been petitioned for listing as endangered or threatened under the U.S. Endangered Species Act. The population is estimated to be fewer than 3,000 individuals.
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