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Emerging Avian Disease$
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Ellen Paul

Print publication date: 2012

Print ISBN-13: 9780520272378

Published to California Scholarship Online: September 2012

DOI: 10.1525/california/9780520272378.001.0001

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PRINTED FROM CALIFORNIA SCHOLARSHIP ONLINE (www.california.universitypressscholarship.com). (c) Copyright University of California Press, 2022. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in CALSO for personal use.date: 25 May 2022

Prevalence and Effects of West Nile Virus on Wild American Kestrel (Falco Sparverius) Populations in Colorado

Prevalence and Effects of West Nile Virus on Wild American Kestrel (Falco Sparverius) Populations in Colorado

Chapter:
(p.45) Chapter Four Prevalence and Effects of West Nile Virus on Wild American Kestrel (Falco Sparverius) Populations in Colorado
Source:
Emerging Avian Disease
Author(s):

Robert J. Dusek

William M. Iko

Erik K. Hofmeister

Publisher:
University of California Press
DOI:10.1525/california/9780520272378.003.0004

To assess the potential impacts of West Nile virus (WNV) on a wild population of free-ranging raptors, we investigated the prevalence and effects of WNV on American Kestrels (Falco sparverius) breeding along the Front Range of the Rocky Mountains in northern Colorado. We monitored kestrel nesting activity at 131 nest boxes from March to August 2004. Of 81 nest attempts, we obtained samples from 111 adults and 250 young. We did not detect WNV in sera; however, 97.3% (108/111) of adults tested positive for WNV neutralizing antibodies. In contrast, 10.0% (23/240) of chicks tested positive for WNV neutralizing antibodies, which possibly represented passive transfer of maternal antibodies. Clutch size, hatching, and fledging success in our study did not differ from that previously reported for this species, suggesting that previous WNV exposure in kestrels did not have an effect on reproductive parameters measured in the breeding population we studied in 2004.

Keywords:   American Kestrel, Colorado, Falco sparverius, raptor, reproductive success, Phthiraptera, West Nile virus

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