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- Larger Work: This publication is Chapter 6 of Sagebrush ecosystem conservation and management: Ecoregional assessment tools and models for the Wyoming Basins
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Abstract
Sagebrush (Artemisia spp.) steppe ecosystems have experienced recent changes resulting not only in the loss of habitat but also fragmentation and degradation of remaining habitats. As a result, sagebrush-obligate and sagebrush associated songbird populations have experienced population declines over the past several decades. We examined landscape-scale responses in occupancy and abundance for six focal songbird species at 318 survey sites across the Wyoming Basins Ecoregional Assessment (WBEA) area. Occupancy and abundance models were fit for each species using datasets developed at multiple moving window extents to assess landscape-scale relationships between abiotic, habitat, and anthropogenic factors. Anthropogenic factors had less influence on species occupancy or abundance than abiotic and habitat factors. Sagebrush measures were strong predictors of occurrence for sagebrush-obligate species, such as Brewer’s sparrows (Spizella breweri), sage sparrows (Amphispiza belli) and sage thrashers (Oreoscoptes montanus), as well as green-tailed towhees (Pipilo chlorurus), a species associated with mountain shrub communities. Occurrence for lark sparrows (Chondestes grammacus) and vesper sparrows (Pooecetes gramineus), considered shrub steppe-associated species, was also related to big sagebrush communities, but at large spatial extents. Although relationships between anthropogenic variables and occurrence were weak for most species, the consistent relationship with sagebrush habitat variables suggests direct habitat loss and not edge or additional fragmentation effects are causing declines in the avifauna examined in the WBEA area. Thus, natural and anthropogenic disturbances that result in loss of critical habitats are the biggest threats to these species. We applied our models spatially across the WBEA area to identify and prioritize key areas for conservation.
Study Area
| Publication type | Book chapter |
|---|---|
| Publication Subtype | Book Chapter |
| Title | Chapter 6: Detectability adjusted count models of songbird abundance |
| Chapter | 6 |
| ISBN | 978-0-615-55530-0 |
| Year Published | 2011 |
| Language | English |
| Publisher | Allen Press |
| Publisher location | Lawrence, Kansas |
| Contributing office(s) | Forest and Rangeland Ecosystem Science Center, Fort Collins Science Center |
| Description | 80 p. |
| Larger Work Type | Book |
| Larger Work Subtype | Monograph |
| Larger Work Title | Sagebrush ecosystem conservation and management: Ecoregional assessment tools and models for the Wyoming Basins |
| First page | 141 |
| Last page | 220 |
| Public Comments | The U.S. Geological Survey has been given express permission by the publisher to provide full-text access online for this publication, and is posted with the express permission from the Publications Warehouse Guidance Subcommittee |
| Country | United States |
| State | Wyoming |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |