Ghosts of habitats past: Contribution of landscape change to current habitats used by shrubland birds

Ecology
By:  and 

Links

Abstract

Models of habitat associations for species often are developed with an implicit assumption that habitats are static, even though recent disturbance may have altered the landscape. We tested our hypothesis that trajectory and magnitude of habitat change influenced observed distribution and abundance of passerine birds breeding in shrubsteppe habitats of southwestern Idaho. Birds in this region live in dynamic landscapes undergoing predominantly large-scale, radical, and unidirectional habitat change because wildfires are converting shrublands into expanses of exotic annual grasslands. We used data from field surveys and satellite image analyses in a series of redundancy analyses to partition variances and to determine the relative contribution of habitat change and current landscapes. Although current habitats explained a greater proportion of total variation, changes in habitat and measures of habitat richness and texture also contributed to variation in abundance of Horned Larks (Eremophila alpestris), Brewer’s Sparrows (Spizella breweri), and Sage Sparrows (Amphispiza belli). Abundance of birds was insensitive to scale for nonspatial habitat variables. In contrast, spatial measures of habitat richness and texture in the landscape were significant only at large spatial scales. Abundance of Horned Larks, Western Meadowlarks (Sturnella neglecta), and Brewer’s Sparrows, but not Sage Thrashers (Oreoscoptes montanus) or Sage Sparrows, was positively correlated with changes toward stable habitats. Because dominant habitat changes were toward less stable conditions, regional declines of those birds in shrubsteppe habitats reflect current landscapes as well as the history, magnitude, and trajectory of habitat change.

Study Area

Publication type Article
Publication Subtype Journal Article
Title Ghosts of habitats past: Contribution of landscape change to current habitats used by shrubland birds
Series title Ecology
DOI 10.1890/0012-9658(2000)081[0220:GOHPCO]2.0.CO;2
Volume 81
Issue 1
Year Published 2000
Language English
Publisher Ecological Society of America
Contributing office(s) Forest and Rangeland Ecosystem Science Center
Description 8 p.
First page 220
Last page 227
Country United States
State Idaho
Google Analytic Metrics Metrics page
Additional publication details