| Distribution, abundance, and habitat affinities of the Coastal Plain Swamp Sparrow.: An article from: Wilson Bulletin | Digitalby Jon Beadell (Author), Russell Greenberg (Author), Sam Droege (Author), J. Andrew Royle (Author)
| List Price: | $5.95 | | | Available: | Available for download now |
| | Binding: | Digital | | Publisher: | Wilson Ornithological Society | | Page Count: | 15 Pages | | Publication Date: | March 01, 2003 |
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This digital document is an article from Wilson Bulletin, published by Wilson Ornithological Society on March 1, 2003. The length of the article is 4382 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.From the author: We examined the distribution and abundance of the Coastal Plain Swamp Sparrow (Melospiza georgiana nigrescens) at previously occupied sites and points within potential habitat. We found Swamp Sparrows throughout their formerly documented range except in southern Chesapeake Bay. Swamp Sparrows were most common in the Mullica River region of New Jersey where we detected individuals at 78% of systematically chosen points with a mean count of 4.1 birds/point. The percentages of points with positive detections in the regions of Delaware River (39%), eastern Delaware Bay (23%), western Delaware Bay (34%), and Tuckahoe River (31%) were lower. The mean count of birds/point was between 0.4 and 0.6 in these regions. A higher resolution Poisson model of relative abundance suggested that the greatest concentrations of Swamp Sparrows occurred not only in the Mullica River area but also along northwestern Delaware Bay. Regression analysis of Swamp Sparrow counts and habitat features identified shrubs (Iva frutescens and Baccharis halimifolia) as a key habitat component. By applying density estimates generated by DISTANCE (Thomas et al. 1998) to the approximate area of potential shrub habitat along Delaware Bay, we estimated that the core population of Coastal Plain Swamp Sparrows was less than 28,000 pairs. We recommend that the Coastal Plain Swamp Sparrow be listed as a subspecies of concern by state and local governments because of its relatively small population size, restricted distribution in the mid-Atlantic region, and narrow habitat requirements. Received 23 April 2002, accepted 13 November 2002.Citation DetailsTitle: Distribution, abundance, and habitat affinities of the Coastal Plain Swamp Sparrow.Author: Jon BeadellPublication: Wilson Bulletin (Refereed)Date: March 1, 2003Publisher: Wilson Ornithological SocietyVolume: 115 Issue: 1 Page: 38(7)Distributed by Thomson Gale |
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