Daytime Habitat Selection by Resident Golden Eagles (<i>Aquila chrysaetos</i>) in Southern Idaho, U.S.A

LeBeau, Chad W.; Nielson, Ryan M.; Hallingstad, Eric; Young, David P.

doi:10.3356/jrr-13-00052.1

Cited by 6 publications

(4 citation statements)

References 28 publications

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“…In the absence of designed, probabilistic nest surveys, the actual number of golden eagle nest sites within each region could not be estimated. Observed densities of golden eagle nest sites within RND bins in all modeling regions were consistent with nesting densities reported in the literature (e.g., [64, 28, 2]). Two important points need to be made about our observed golden eagle nest site densities within RND bins.…”

Section: Discussionsupporting

confidence: 87%

“…This finding is consistent with empirical studies and regional models of breeding habitat selection in areas where golden eagles nest predominantly on cliffs and rock outcrops [62, 45]. Field studies have consistently identified variable terrain and gentle slopes, along with wind and orographic uplift variables, as important predictors of golden eagle space-use within home ranges [52, 62–64]; in our study these variables were moderately important covariates in 8 of 12 modeling regions (Figs in S3 Fig). Our models also incorporated land cover variables thought to influence prey availability positively, such as sagebrush and grassland cover, and riparian habitat; or negatively, including barren areas, cropland, and introduced annual grasses (e.g.…”

Section: Discussionsupporting

confidence: 80%

“…Our models also incorporated land cover variables thought to influence prey availability positively, such as sagebrush and grassland cover, and riparian habitat; or negatively, including barren areas, cropland, and introduced annual grasses (e.g. cheatgrass, Bromus tectorum ) [52, 64, 65]. At coarser scales (1.0–6.4 km) surrounding nest sites, model predictions were influenced by regionally specific suites of covariates related to foraging and prey habitats.…”

Section: Discussionmentioning

confidence: 99%

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Modeling spatial variation in density of golden eagle nest sites in the western United States

et al. 2019

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In order to contribute to conservation planning efforts for golden eagles (Aquila chrysaetos) in the western U.S., we developed nest site models using >6,500 nest site locations throughout a >3,483,000 km2 area of the western U.S. We developed models for twelve discrete modeling regions, and estimated relative density of nest sites for each region. Cross-validation showed that, in general, models accurately estimated relative nest site densities within regions and sub-regions. Areas estimated to have the highest densities of breeding golden eagles had from 132–2,660 times greater densities compared to the lowest density areas. Observed nest site densities were very similar to those reported from published studies. Large extents of each modeling region consisted of low predicted nest site density, while a small percentage of each modeling region contained disproportionately high nest site density. For example, we estimated that areas with relative nest density values <0.3 represented from 62.8–97.8% ( = 82.5%) of each modeling area, and those areas contained from 14.7–30.0% ( = 22.1%) of the nest sites. In contrast, areas with relative nest density values >0.5 represented from 1.0–12.8% ( = 6.3%) of modeling areas, and those areas contained from 47.7–66.9% ( = 57.3%) of the nest sites. Our findings have direct application to: 1) large-scale conservation planning efforts, 2) risk analyses for land-use proposals such as recreational trails or wind power development, and 3) identifying mitigation areas to offset the impacts of human disturbance.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionsupporting

confidence: 80%

Section: Discussionmentioning

confidence: 99%

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Modeling spatial variation in density of golden eagle nest sites in the western United States

et al. 2019

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“…Despite the importance of subadults, golden eagle habitat or nest‐site selection studies in North America have focused primarily on breeding adults (Marzluff et al 1997, McIntyre and Schmidt 2012, Watson et al 2014, Braham et al 2015, Crandall et al 2015). During breeding season, nest locations facilitate monitoring of adults (Watson et al 2014, LeBeau et al 2015). In contrast, subadults may roam extensively, sometimes moving thousands of kilometers from their natal nest, and their movements are not constrained by breeding or territorial behaviors (O'Toole et al 1999, Soutullo et al 2006, 2013, Murphy et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Seasonal variation in resource selection by subadult golden eagles in the Great Basin Desert

et al. 2021

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Golden eagles Aquila chrysaetos are a long‐lived and wide‐ranging species believed to be stable or in slight decline across North America. Golden eagles have an extended subadult stage (4–5 years) that is critical to maintaining recruitment into the breeding population and population viability. Compared to adult golden eagles, the ecology of subadult golden eagles (hereafter, subadults) has received little attention. We investigated patterns of resource selection for subadults in the Great Basin Desert of the western United States during summer and winter, 2013–2019. We monitored 46 subadults with GPS transmitters and related locations (n = 99 037) with predictors hypothesized to influence seasonal patterns of space use with mixed‐effects logistic regression. Subadults selected for ridges and upper slopes in summer and winter, but higher elevations in summer. Subadults showed weak selection for lower ridge density in summer, which was likely facilitated by selection for areas with greater thermal wind current potential. In contrast, subadults showed strong selection for higher ridge density in winter. Subadults selected areas further from roads in summer and closer to roads and electrical transmission lines in winter, which may be related to winter scavenging of road‐killed ungulates. Resource selection functions suggested subadults selected for shrublands and woodlands in both seasons, but odds ratios revealed that during winter subadults avoided shrublands and increased selection of woodlands relative to summer. Subadults selected for areas with infrequent fires in both seasons; areas with frequent fires were avoided in summer but selected for in winter. Seasonal changes in resource selection suggested that subadults used woodlands more than expected, potentially reflecting spatial partitioning by subadults to lower‐quality habitats to minimize competition with breeding adults during winter when energetic demands for thermoregulation were presumably higher and prey more limited.

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Satellite tracking a wide-ranging endangered vulture species to target conservation actions in the Middle East and East Africa

Buechley

McGrady²,

Çoban³

et al. 2018

Biodivers Conserv

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Daytime Habitat Selection by Resident Golden Eagles (Aquila chrysaetos) in Southern Idaho, U.S.A

Cited by 6 publications

References 28 publications

Modeling spatial variation in density of golden eagle nest sites in the western United States

Modeling spatial variation in density of golden eagle nest sites in the western United States

Seasonal variation in resource selection by subadult golden eagles in the Great Basin Desert

Satellite tracking a wide-ranging endangered vulture species to target conservation actions in the Middle East and East Africa

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