Regional Variation in Diets of Breeding Red-Shouldered Hawks

Strobel, Bradley N.; Boal, Clint W.

doi:10.1676/09-071.1

Cited by 17 publications

(17 citation statements)

References 11 publications

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“…However, our data show little correlation between nest tree height and average nest-plot dbh (Pearson's product-moment, t = 21.2, df = 25, p = 0.22), suggesting other factors may be causing selection for plots with higher average dbh than available. For example, previous studies have found red-shouldered hawk diets consist in part of prey species that inhabit wetlands and riparian forests Strobel and Boal 2010). The forest stands on our study are restricted primarily to riparian corridors and floodplains frequented by red-shouldered hawk.…”

Section: Resultsmentioning

confidence: 77%

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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Section: Resultsmentioning

confidence: 77%

Red-Shouldered Hawk Nesting Habitat Preference in South Texas

Strobel

Boal

2010

Journal of Fish and Wildlife Management

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“…For Red-shouldered Hawks in southern Ohio, the influence of snow cover during winter on hatching (and thus laying) date seems likely mediated by prey availability. Although Redshouldered Hawks are dietary generalists (Strobel and Boal, 2010;Dykstra et al, 2020), they consume a significant amount of mammalian prey (56% by biomass) in the breeding season (Dykstra et al, 2003), and that number is likely higher during winter when reptile and amphibian prey are mostly unavailable at this latitude. As sit-and-wait perch hunters, Red-shouldered Hawks watch for prey (particularly voles, Microtus spp.)…”

Section: Discussionmentioning

confidence: 99%

Breeding Phenology of Red-Shouldered Hawks (Buteo lineatus) Is Related to Snow Cover and Air Temperature During the Pre-Laying Period

Dykstra¹,

Hays²,

Simon³

et al. 2021

Front. Ecol. Evol.

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Global climate change has advanced the breeding phenology of many avian species. However, raptors’ breeding phenologies may not respond in the same way to the factors that influence passerine breeding dates. We studied reproduction of suburban and rural Red-shouldered Hawks (Buteo lineatus) in southern Ohio, United States, from 1997 to 2020. Mean hatching dates for 786 broods were 24 April [Julian day: 114.1 ± 0.3 d (SE)] for suburban birds and 25 April (Julian day: 114.5 ± 0.4) for rural birds. Egg-laying date averages approximately 33 days before hatching date, or about the third week of March. We used mixed models to test which factors influenced nestling hatching dates from 1997 to 2020. The best model included year, days of snow cover during the pre-laying period (February–March), and mean March temperature, with days of snow cover having the largest effect. Hatching date (in Julian days) was positively related to snow cover and negatively related to air temperature, i.e., young hatched earlier in years with fewer days of snow cover and in warmer years). Young also hatched slightly later as the study progressed. Overall, neither mean hatching date nor any of the weather variables showed a significant trend over the course of the study. Previously published reports indicate that many raptor species do not exhibit advancing hatching dates, and breeding phenologies often reflect local weather conditions. The complexity and diversity of raptor responses to climate change underscore the importance of long-term studies of raptors at multiple locations.

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“…Puerto Rican Broad‐winged Hawks rely more on rats (35% of diet) and birds (17%), and less on snakes (3%; Hengstenberg and Vilella ). The percentage of reptile prey in the diet of Red‐shouldered Hawks ( Buteo lineatus ) in North America ranges from ∼12% in northern populations to 23% in southern populations (Strobel and Boal ).…”

Section: Discussionmentioning

confidence: 99%

Feeding ecology and specialist diet of critically endangered Ridgway's Hawks

Woolaver

Nichols²,

Morton

et al. 2013

Journal of Field Ornithology

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Ridgway's Hawks (Buteo ridgwayi) are critically endangered forest raptors endemic to the Caribbean island of Hispaniola, with ∼100 pairs remaining in the world. The species is ecologically little known yet such studies are important for understanding critical habitat needs and population dynamics. We studied the provisioning behavior of adults at 22 nests on the northeast coast of the Dominican Republic from 2005 to 2008. Mean brood size was 1.80 ± 0.45, and the mean number of fledglings per nest was 1.10 ± 0.97. We found that 80% of the prey items delivered to nestlings were reptiles, with lizards accounting for 65% of the prey and those in the genus Celestus accounting for nearly 35% of prey. Other prey items included snakes (14%), rats (9%), and smaller proportions of birds, frogs, and centipedes. The number of prey items and amount of biomass delivered to nestlings did not vary with brood size, but adults delivered more prey to 3‐ to 5‐week‐old nestlings and more biomass to 5‐week‐old nestlings. Food delivery rates did not differ between successful or failed nests, suggesting that food availability did not influence nest outcome. Given that most prey items delivered to nestlings in our study were reptiles, conservation strategies developed for Ridgway's Hawks (e.g., translocations and habitat conservation) should take into consideration their specialist reptile diet.

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Regional Variation in Diets of Breeding Red-Shouldered Hawks

Cited by 17 publications

References 11 publications

Red-Shouldered Hawk Nesting Habitat Preference in South Texas

Red-Shouldered Hawk Nesting Habitat Preference in South Texas

Breeding Phenology of Red-Shouldered Hawks (Buteo lineatus) Is Related to Snow Cover and Air Temperature During the Pre-Laying Period

Feeding ecology and specialist diet of critically endangered Ridgway's Hawks

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