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Breeding Bird Communities and Habitat Associations in the Grasslands of the Chilcotin Region, British Columbia

Tracey D. HooperMichael D. PittCanada-British Columbia Partnership Agreement on Forest Resource Development: FRDA II.

出版	Canada-British Columbia Partnership Agreement on Fores Resource Development, 1996
主題	Nature / Birdwatching GuidesScience / Life Sciences / Botany
ISBN	07726278519780772627858
URL	http://books.google.com.hk/books?id=hzZUOZYuAX8C&hl=&source=gbs_api

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The objectives of this study were to: characterise breeding bird communities in the grasslands around Riske Creek, Chilcotin Region, British Columbia; determine distribution and density of long-billed curlews in the Chilcotin-Cariboo grasslands; identify associations between grassland habitat characteristics, food resource availability, and grassland bird diversity, and species abundances; and elucidate the potential effects of livestock grazing on grassland breeding birds and their habitats. The investigators established 13 study sites around Riske Creek and used point counts and spot-mapping methods to census birds. They measured the following habitat characteristics: vegetation height, vertical cover, and patchiness; horizontal cover of different physiognomic features; arthropod abundances; and site slope, aspect, and elevation. Season, intensity, and duration of grazing by livestock and bighorn sheep were also determined and behavioural observations were made of the use of different structures by birds. Correlations between birds and grazing indicated which species were either positively or negatively associated with grazing.