Berardi, Faculty Advisor, Vic

Capparella, Faculty Advisor, Angelo

Groves, Anna

Harper, Faculty Advisor, Given

Knapp, Faculty Advisor, Gretchen

Sweet, Faculty Advisor, Paul

English

Digital Commons @ Illinois Wesleyan University

Illinois Wesleyan UniversityDigital Commons @ IWUJohn Wesley Powell Student ResearchConference 2011, 22nd Annual JWP ConferenceApr 9th, 9:00 AM - 10:00 AMWinter Abundance of Red-Tailed Hawks (Buteojamaicensis) and American Kestrels (Falcosparverius) in Human-Altered Landscapes inNortheastern and Central IllinoisAnna GrovesIllinois Wesleyan UniversityVic Berardi, Faculty AdvisorIllinois Beach State Park Hawk WatchPaul Sweet, Faculty AdvisorIllinois Beach State Park Hawk WatchAngelo Capparella, Faculty AdvisorIllinois State UniversityGretchen Knapp, Faculty AdvisorIllinois State UniversitySee next page for additional authorsFollow this and additional works at: http://digitalcommons.iwu.edu/jwprcPart of the Environmental Sciences CommonsThis Event is brought to you for free and open access by The Ames Library, the Andrew W. Mellon Center for Curricular and FacultyDevelopment, the Office of the Provost and the Office of the President. It has been accepted for inclusion in Digital Commons @ IWU bythe faculty at Illinois Wesleyan University. For more information, please contact digitalcommons@iwu.edu.©Copyright is owned by the author of this document.Groves, Anna; Berardi, Faculty Advisor, Vic; Sweet, Faculty Advisor, Paul; Capparella, Faculty Advisor, Angelo; Knapp,Faculty Advisor, Gretchen; and Harper, Faculty Advisor, Given, "Winter Abundance of Red-Tailed Hawks (Buteojamaicensis) and American Kestrels (Falco sparverius) in Human-Altered Landscapes in Northeastern and Central Illinois"(2011). John Wesley Powell Student Research Conference. 10.http://digitalcommons.iwu.edu/jwprc/2011/posters/10Presenter InformationAnna Groves; Vic Berardi, Faculty Advisor; Paul Sweet, Faculty Advisor; Angelo Capparella, Faculty Advisor;Gretchen Knapp, Faculty Advisor; and Given Harper, Faculty AdvisorThis event is available at Digital Commons @ IWU: http://digitalcommons.iwu.edu/jwprc/2011/posters/10THE JOHN WESLEY POWELL STUDENT RESEARCH CONFERENCE APRIL 2011 Poster Presentation P19 WINTER ABUNDANCE OF RED-TAILED HAWKS (BUTEO JAMAICENSIS) AND AMERICAN KESTRELS (FALCO SPARVERIUS) IN HUMAN-ALTERED LANDSCAPES IN NORTHEASTERN AND CENTRAL ILLINOIS Anna Grovesl , Vic Berardi2, Paul Sweet3, Janice Sweet3 , Angelo Capparella 4, Gretchen Knapp 4, and Given Harper*5 lEnvironmental Studies Program, Illinois Wesleyan University 2Hawk Migration Association of North America, Illinois Beach State Park Hawk Watch, Zion, IL 3Illinois Beach State Park Hawk Watch, Zion, IL 4School of Biological Sciences, Illinois State University, Normal, IL 5Department of Biology, Illinois Wesleyan University Though Red-tailed Hawks and American Kestrels are among the most common raptors found across North America, no study has examined their winter abundance in Illinois since 1967, This study investigated their winter abundance using five years (2004-05 through 2008-09) of winter (December­March) automobile survey results (201 surveys) in northeastern and central Illinois using a standardized survey technique, In northeastern Illinois, red-tails were most abundant in 2004-05 (145,6 median/lOOO km) and least abundant in 2006-07 (63,8); the highest number was observed in March and the lowest in February, In central Illinois, red-tails were most abundant in 2008-09 (228,3 median/lOOO km) and least abundant in 2004-05 (112.4); the highest number was observed in February and the lowest in December. There were no significant effects of year (northeast, P=O, 14; central, P= 0.44) or month (northeast, P=O,58; central, P=O,51) on red-tail abundance in either region, Adults were observed 9,0 times more frequently than immatures, In northeast Illinois, kestrels were most abundant in 2006-07 (38,8 median/lOOO km) and least abundant in 2004-05 (15,2); abundance was highest in January and lowest in March, In central Illinois, kestrels were most abundant in 2005-06 (88,8 median/lOOO km) and least abundant in 2004-05 (35,S); abundance was highest in February and lowest in January, There was no significant effect of month (northeast, P=O,87; central, P=0.40) on kestrel abundance, or of year (P=O,21) in northeast Illinois, In contrast, there was a significant effect of year (P=O,003) on kestrel abundance in central Illinois, In all surveys males were observed 1 .  7 times more frequently than females 

Winter Abundance of Red-Tailed Hawks (\u3cem\u3eButeo jamaicensis\u3c/em\u3e) and American Kestrels (\u3cem\u3eFalco sparverius\u3c/em\u3e) in Human-Altered Landscapes in Northeastern and Central Illinois

https://digitalcommons.iwu.edu/cgi/viewcontent.cgi?article=2658&amp;context=jwprc

Winter Abundance of Red-Tailed Hawks (\u3cem\u3eButeo jamaicensis\u3c/em\u3e) and American Kestrels (\u3cem\u3eFalco sparverius\u3c/em\u3e) in Human-Altered Landscapes in Northeastern and Central Illinois

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