| Abstract: | We report on the habitat associations of 21 species of grassland birds overwintering in or migrating through southern Texas, during 1991-1992 and 1992-1993. Ninety percent of our grassland bird observations were made during winter and spring, and only 10% occurred during fall. Grassland species made up a high proportion of the total bird densities in grassland and shrub-grassland habitats, but much lower proportions in the habitats with more woody vegetation. Fewer grassland species were observed in grassland and woodland than in brushland, parkland, and shrub-grassland habitats. Grassland birds generally were found in higher densities in habitats that had woody canopy coverage of < 30%; densities of grassland birds were highest in shrub-grassland habitat and lowest in woodland habitat. Species that are grassland specialists on their breeding grounds tended to be more habitat specific during the nonbreeding season compared to shrub-grassland specialists, which were more general in their nonbreeding-habitat usage. Nonetheless, our data demonstrate that grassland birds occur in a variety of habitats during the nonbreeding season and seem to occupy a broader range of habitats than previously described. |
| Genre: | Article |
| ProdID: | 70021215 |
| Citation Author: | Igl, L. D.; Ballard, B. M. |
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| Citation End Page: | 782 |
| Citation Issue: | 4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Condor |
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| Citation Number Of Pages: | 12 |
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| Citation Search Results Text: | Habitat associations of migrating and overwintering grassland birds in southern Texas; 1999; Article; Journal; Condor; Igl, L. D.; Ballard, B. M. |
| Citation Start Page: | 771 |
| Citation Volume: | 101 |
| Citation Year: | 1999 |
| Type: | citation/reference |
| Text: | Habitat associations of migrating and overwintering grassland birds in southern Texas; 1999; Article; Journal; Condor; Igl, L. D.; Ballard, B. M. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Fri, 1 Jan 1999 00:00 -0600 |
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