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USGS · 5224086

First specimen record of White-winged Dove (Zenaida asiatica) for Washington, DC

C.J. Angle·C.J. Dove
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C.J. Angle, C.J. Dove. 1999. First specimen record of White-winged Dove (Zenaida asiatica) for Washington, DC. https://pubs.usgs.gov/publication/5224086

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USGS1994

Distribution and abundance of birds wintering in Maryland, 1988-1993

A winter bird survey was conducted throughout Maryland, primarily by volunteers, during the 6 winters of 1988 to 1993 between the dates of 10 Jan and 10 Feb. The state of Maryland is covered by 1231 blocks (9.5 sq. miles each), each comprising one-sixth of the standard U.S.G.S. 7.5 minute topographic quadrangle, and 548 of these blocks (44.5%) were surveyed for winter birds. Blocks were chosen in a systematic pattern with eventually almost every other block in the state having been surveyed as of Feb, 1993. Volunteers conducted each 4-hour survey by walking a 4-6 mile route chosen by the volunteer to sample habitats in proportion to their availability in the block. Surveys began around sunrise (~7:30 a.m.) and all birds seen or heard during the 4 hours were recorded on data sheets. The data were then used to create maps representing the distribution and relative abundance of each species of wintering bird found in at least 10 blocks in the state.

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