Red-Shouldered Hawk Home-Range and Habitat Use in Southern California

Bloom, Peter H.; McCrary, Michael D.; Gibson, Marjorie J.

doi:10.2307/3809422

Cited by 42 publications

(15 citation statements)

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“…data). With respect to conservation status the subspecies is considered stable (Harlow and Bloom 1989) or expanding (Wilbur 1973, Bloom andMcCrary 1996).…”

Section: Distributionmentioning

confidence: 99%

Vagrant Western Red-shouldered Hawks: Origins, Natal Dispersal Patterns, and Survival

et al. 2011

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We report the results of a 40-year study of the western Red-shouldered Hawk (Buteo Uneatus elegans) involving the banding of 2742 nestlings in southern California from 1970 to 2009 (this study) plus 127 nestlings banded in other California studies and the analyses of 119 records of subsequent recovery from the Bird Banding Laboratory , Of the Red-shouldered Hawks recovered, 109 (91.6%) moved <100 km (short-distance dispersers), while 10 (8.4%) moved >100 km (long-distance dispersers). Three (2.5%), all long-distance dispersers, were vagrants (recovered outside the species' range of residency), and were found 374 to 843 km northeast and south of their banding locations in the Mojave, Great Basin, and Vizcaino deserts. The distribution of directions of short-distance dispersal was bipolar, closely corresponding with the northwest-southeast orientation of the species' range in southern California, while that of long-distance dispersers was mainly to the north. One of 10 long-distance dispersers, a nonvagrant, survived well into the age of breeding (103.0 months), whereas eight of the other nine perished before 14.5 months. The implications of vagrancy for conservation of this resident subspecies are that a relatively small source area can contribute genetic material over a vastly larger receiving area but rarely does so because of high mortality rates. Nonetheless, the movements of vagrants we documented provide evidence for the species' potential to populate new landscapes in response to changing environmental conditions and to maintain genetic heterogeneity within existing populations.

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“…data). With respect to conservation status the subspecies is considered stable (Harlow and Bloom 1989) or expanding (Wilbur 1973, Bloom andMcCrary 1996).…”

Section: Distributionmentioning

confidence: 99%

Vagrant Western Red-shouldered Hawks: Origins, Natal Dispersal Patterns, and Survival

et al. 2011

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“…However, several studies have documented populations of red-shouldered hawks successfully breeding in highly altered human landscapes (e.g., Bloom et al 1993;Rottenborn 2000;Dykstra et al 2001). Nest site selection by red-shouldered hawks is apparently based on general but flexible criteria, and likely occurs at multiple scales.…”

Section: Introductionmentioning

confidence: 99%

Red-Shouldered Hawk Nesting Habitat Preference in South Texas

Strobel

Boal

2010

Journal of Fish and Wildlife Management

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We examined nesting habitat preference by red-shouldered hawks Buteo lineatus using conditional logistic regression on characteristics measured at 27 occupied nest sites and 68 unused sites in 2005-2009 in south Texas. We measured vegetation characteristics of individual trees (nest trees and unused trees) and corresponding 0.04-ha plots. We evaluated the importance of tree and plot characteristics to nesting habitat selection by comparing a priori tree-specific and plot-specific models using Akaike's information criterion. Models with only plot variables carried 14% more weight than models with only center tree variables. The model-averaged odds ratios indicated red-shouldered hawks selected to nest in taller trees and in areas with higher average diameter at breast height than randomly available within the forest stand. Relative to randomly selected areas, each 1-m increase in nest tree height and 1-cm increase in the plot average diameter at breast height increased the probability of selection by 85% and 10%, respectively. Our results indicate that red-shouldered hawks select nesting habitat based on vegetation characteristics of individual trees as well as the 0.04-ha area surrounding the tree. Our results indicate forest management practices resulting in tall forest stands with large average diameter at breast height would benefit red-shouldered hawks in south Texas.

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“…In our study area, red-shouldered hawks appeared to require at least 20 ha of mature uncut or lightly selection-cut hardwood forest within 500 m of primary nests. In other areas, red-shouldered hawks typically have 20-50 ha of preferred forest habitat associated with nest sites (Sharp and Campbell 1982, Bosakowski et al 1992, Bloom et al 1993, Moorman and Chapman 1996, Howell and Chapman 1997.…”

Section: Definition Of Variables Used In Logistic Regression Analysesmentioning

confidence: 99%

Effects of forest management practices on red-shouldered hawks in Ontario

Naylor¹,

Baker²,

Szuba³

2004

The Forestry Chronicle

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The red-shouldered hawk (Buteo lineatus) is a species of special concern throughout its northern range. It is considered to be sensitive to forest management practices because it requires dense mature hardwood forest for nesting. In Ontario, guidelines that prescribe spatial and temporal buffers were developed in about 1990 to mitigate the potential impacts of harvesting. We monitored 84 nesting areas of red-shouldered hawks in central and southeastern Ontario from 1988 to 1995 to describe the effects of forest management practices on the occupancy and productivity of nesting areas, to evaluate the effectiveness of the guidelines, and recommend modifications as appropriate. The number of years nesting areas had been used previously had a significant negative effect on activity status, but not on nest success. Nesting areas harvested with application of the guidelines had a similar probability of being active to those in uncut forest but nesting areas harvested without application of the guidelines did not. Neither the area nor proximity of selection cuts with a moderate to high residual basal area (≥ 18 m 2 /ha) affected the activity status of nesting areas. In contrast, the area and proximity of heavy cuts (shelterwood cuts or selection cuts with a residual basal area of 14-16 m 2 /ha) appeared to have a negative effect on activity status. When nesting areas were active, the proximity and amount of harvesting did not influence nest success. We concluded that the impact of harvesting on the activity status of nesting areas could be mitigated by prohibiting heavy cuts within 300 m of active nests and retaining ≥ 20 ha of forest dominated by tolerant and mid-tolerant hardwood trees, ≥ 18 m tall, with ≥ 70% canopy closure around nests.Key words: Buteo lineatus, effectiveness monitoring, habitat guidelines, nest success, Ontario, red-shouldered hawk, forest management, selection, shelterwood, tolerant hardwoods La buse à épaulettes (Buteo lineatus) est une espèce d'intérêt spécial partout dans son habitat nordique. Elle est considérée comme étant sensible relativement aux pratiques d'aménagement forestier car elle a besoin de forêts denses de feuillus à maturité pour nidifier. En Ontario, les directives qui prescrivent les zones tampons sur le terrain et dans le temps ont été élaborées approximativement en 1990 afin de mitiger les impacts potentiels de l'exploitation. Nous avons observé 84 zones de nidification de la buse à épaulettes dans le centre et sud-est de l'Ontario de 1988 à 1995 afin de décrire les effets des pratiques d'aménagement forestier sur la présence et la productivité des zones de nidification, afin d'évaluer l'efficacité des directives et afin de recommander des modifications si néces-saire. Le nombre d'année-zone de nidification utilisé précédemment a eu un effet négatif et significatif sur l'état d'activité, mais non sur la réussite de la nidification. Les zones de nidifications récoltées selon les directives ont atteint une probabilité similaire aux nids actifs dans la forêt non récoltée mais l...

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Red-Shouldered Hawk Home-Range and Habitat Use in Southern California

Cited by 42 publications

References 0 publications

Vagrant Western Red-shouldered Hawks: Origins, Natal Dispersal Patterns, and Survival

Vagrant Western Red-shouldered Hawks: Origins, Natal Dispersal Patterns, and Survival

Red-Shouldered Hawk Nesting Habitat Preference in South Texas

Effects of forest management practices on red-shouldered hawks in Ontario

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