Filters: Tags: breeding birds (X)
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We examined the relationship of breeding birds to elevation across and within four adjacent mountain ranges in the central Great Basin, a cold desert in western North America. Data came from 7 years of point counts at elevations from 1,915 to 3,145 m. We focused on eight passerine species that in this region are associated frequently with Pinus monophylla–Juniperus spp. (pinyon–juniper) woodland. Mean elevation of species' presence differed significantly among mountain ranges for all species except Spizella passerina (Chipping Sparrow); all species except Spizella breweri (Brewer's Sparrow) occurred at the highest mean elevation in the Toquima Range. Observed patterns were consistent with the elevational distribution...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Great Basin,
Intermountain West,
Restoration Ecology,
arid woodlands,
bird–habitat associations,
Conclusions:Results indicate that breeding bird species richness patterns significantly increased with fragment size. Area-sensitive species required patches of suitable habitat at least 5-55 ha in size. Edge and vegetation-restricted species were more affected by overall habitat loss of habitat than reductions in average patch size.Thresholds/Learnings:Area-sensitive species required patches of suitable habitat at least 5-55 ha in size, and regularly avoided smaller grassland fragments even when they were composed of suitable habitat
Categories: Publication;
Types: Citation;
Tags: Illinois,
Landscape fragmentation,
Natural cover amount,
birds,
breeding birds,
The study seeks to provide a retrospective analysis of the relationships among bird abundance and distribution and changes in land cover and climate in the upper Midwest and Great Lakes region. The resultant models will be used to provide spatially explicit forecasts of future avian responses. Using data from the North American Breeding Bird Survey (BBS) and a hierarchical modeling framework that accounts for imperfect detection during surveys, species distribution and abundance is estimated. Historic aerial photos are being digitized and classified to measure landscape covariates. Once species-specific relationships between distribution parameters (i.e., occupancy, colonization, extinction) and landscape covariates...
Categories: Data;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: 2011,
Conservation Design,
Conservation NGOs,
EARTH SCIENCE > LAND SURFACE > LANDSCAPE,
Federal resource managers,
The study seeks to provide a retrospective analysis of the relationships among bird abundance and distribution and changes in land cover and climate in the upper Midwest and Great Lakes region. The resultant models will be used to provide spatially explicit forecasts of future avian responses. Using data from the North American Breeding Bird Survey (BBS) and a hierarchical modeling framework that accounts for imperfect detection during surveys, species distribution and abundance is estimated. Historic aerial photos are being digitized and classified to measure landscape covariates. Once species-specific relationships between distribution parameters (i.e., occupancy, colonization, extinction) and landscape covariates...
Categories: Data,
Project;
Tags: 2011,
Conservation Design,
Conservation NGOs,
EARTH SCIENCE > LAND SURFACE > LANDSCAPE,
Federal resource managers,
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