Using Banding and Encounter Data to Investigate Movements of Red-Tailed Hawks in the Northeastern United States

Morrison, Joan L.; Baird, Jason M.

doi:10.3356/rapt-50-02-161-175.1

Cited by 11 publications

(2 citation statements)

References 42 publications

(25 reference statements)

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“…These young birds, representing 17% (9 of 53) of the birds 663 d old encountered in our study, were found primarily north of our study area in the summer, and south of our study area in winter, possibly suggesting some seasonality of their movements and indicating that some segments of this resident population may be more mobile than previously thought. Although southward movement in winter may describe a typical migration pattern, the northward movement seems to indicate that some young Red-shouldered Hawks may wander fairly widely prior to reaching breeding age, as do some other raptors (Soutullo et al 2006a, 2006b, Mojica et al 2008, Whitfield et al 2009, Faccio et al 2013, Morrison and Baird 2016, Watson et al 2019. Three of the four young birds found well to the north in summer were recovered in August of their first year, just a few weeks after fledging.…”

Section: Discussionmentioning

confidence: 92%

Dispersal and Survival of Red-Shouldered Hawks Banded in Suburban Southern Ohio, 1996–20181

Dykstra¹,

Hays²,

Simon³

et al. 2019

Journal of Raptor Research

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We used banding data to investigate dispersal and survival of Red-shouldered Hawks (Buteo lineatus) in two study areas in southern Ohio from 1996 to 2018. Of the 2448 nestlings we banded, 167 (6.8%) were encountered (dead or alive) some time after banding. Mean distance from the natal nest at the time of encounter was 31.6 6 6.2 km (median ¼ 10.0, range ¼ 0.1-568.6 km, n ¼ 163); natal dispersal distance averaged 16.0 6 1.9 km (median ¼ 9.0, range ¼ 1.4-117.1 km, n ¼ 110), and was significantly greater for females than for males. Most hawks dispersed ,30 km, but 11 hawks (6.7%) dispersed .100 km from their natal nest. Of these long-distance dispersers, nine (82%) were ,2 yr old, suggesting that some young birds wander widely prior to breeding. Dispersal distance differed by sex and age at encounter, with dispersal distance negatively correlated with age at encounter, and females dispersing farther (39.8 6 12.3 km) than males (22.8 6 9.86 km) and unknown-sex birds (33.9 6 10.6 km; all P , 0.05; means estimated from the logistical regression model). Dispersal direction for all birds followed a uniform distribution (P. 0.05); however, dispersal direction of long-distance dispersers was not uniform (P , 0.05) but bimodal, with hawks encountered either to the south or to the northeast of the study area. Mean age at recovery was 2.6 6 0.3 yr (median ¼ 1.5 yr, range ¼ 0.2-10.3 yr). As in other raptor species, apparent annual survival varied between age classes, with young birds (hatch-year and second-year) having lower apparent annual survival (0.49 6 0.03) than adult birds (0.76 6 0.03). Our study provides information on dispersal, survival, and causes of mortality of Red-shouldered Hawks, demographic data that are important for evaluating population trends and the sustainability of urban/suburban populations.

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Section: Discussionmentioning

confidence: 92%

Dispersal and Survival of Red-Shouldered Hawks Banded in Suburban Southern Ohio, 1996–20181

Dykstra¹,

Hays²,

Simon³

et al. 2019

Journal of Raptor Research

View full text Add to dashboard Cite

show abstract

“…2009; Bearded vultures, Margalida et al. 2020; or Red‐tailed hawks: Morrison and Baird 2016). The high resighting rate of vultures in the Alps promotes the use of camera traps at scavenger feeding stations, whenever possible, to identify a larger number of individuals.…”

Section: Discussionmentioning

confidence: 99%