| Abstract: | The North American Breeding Bird Survey has provided an annual index of population change since 1966. About 2400 randomly distributed roadside routes of 50 three-minute stops each provide the basic data for computer analysis. One of the reports produced shows the percentage of routes on which each species is encountered in each state and each Canadian province. This percentage is used to show expansion and contraction of breeding range and also important changes in frequency of encounter within various portions of the range of each species. Most of the recent changes in range fall in one of these 7 categories: (1) introduced species; (2) species given special protection; (3) species benefiting from artificial feeding in winter; (4) species taking advantage of shelterbelts; (5) species nesting on large highway bridges and dams; (6) species that feed on grain lost during mechanical harvesting: and (7) species losing habitat as a result of urban expansion. Examples of each category are supported by changes in the rate of encounter. |
| Genre: | Book chapter |
| ProdID: | 5210155 |
| Citation Author: | Robbins, C.S. |
| Citation Contributing Office: | Patuxent Wildlife Research Center |
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| Citation Editor: | Ilyichev, V.D.; Gavrilov, V.M. (editors) |
| Citation End Page: | 742 |
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| Citation Language: | English |
| Citation Larger Work Title: | Acta XVIII Congressus Internationalis Ornithologici, volume II |
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| Citation Phsyical Description: | 580-1335 |
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| Citation Public Comments: | held in Moscow, August 16-24, 1982 |
| Citation Publisher: | Academy of Sciences of the USSR |
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| Citation Search Results Text: | Recent changes in the ranges of North American birds; 1985; Book chapter; Acta XVIII Congressus Internationalis Ornithologici, volume II; Robbins, C.S. |
| Citation Start Page: | 737 |
| Citation Volume: | |
| Citation Year: | 1985 |
| Type: | citation/reference |
| Text: | Recent changes in the ranges of North American birds; 1985; Book chapter; Acta XVIII Congressus Internationalis Ornithologici, volume II; Robbins, C.S. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Tue, 9 Jun 2009 09:23 -0500 |
| Publisher: | Academy of Sciences of the USSR |
