Regional analysis of riparian bird species response to vegetation and local habitat features

Autor:	Grant Ballard, Nadav Nur, Geoffrey R. Geupel
Rok vydání:	2008
Předmět:	geography geography.geographical_feature_category Ecology biology Vegetation biology.organism_classification Habitat Populus fremontii Artemisia douglasiana Abundance (ecology) Valley oak Animal Science and Zoology San Joaquin Ecology Evolution Behavior and Systematics Riparian zone
Zdroj:	The Wilson Journal of Ornithology. 120:840-855
ISSN:	1938-5447 1559-4491
DOI:	10.1676/06-098.1
Popis:	We investigated relationships between riparian bird abundance and local vegetation characteristics and habitat features across the Sacramento/San Joaquin Valley, California. Number of detections was analyzed for each of 21 species from point count surveys over a 4-year period at 22 sites from three regions (Sacramento River, Cosumnes River, and San Joaquin River) in relation to 16 measures of habitat and vegetation composition within 50 m of 184 survey points. Tree variables, including tree height and trunk diameter, were often important, as was specific composition of tree species, especially Fremont cottonwood (Populus fremontii) and valley oak (Quercus lobata). Effects of mugwort (Artemisia douglasiana) and blackberry (Rubus spp.) were generally positive. The median partial R2 due to vegetation/habitat characteristics was 16% after controlling for regional differences in abundance per species. Comparisons of model results at the local versus regional scale revealed spatial variation in bird ab...
Databáze:	OpenAIRE
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