Access Restriction

Author Dawson, Russell D. ♦ Bortolotti, Gary R. ♦ Murza, Gillian L.
Source CiteSeerX
Content type Text
File Format PDF
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Natural Handicap ♦ Sex-dependent Frequency ♦ Foot Handicap ♦ American Kestrel ♦ Broken Feather ♦ Morphological Abnormality ♦ Male Kestrel ♦ Breeding Season ♦ Seasonal Trend ♦ Behavioural Study ♦ Body Condition ♦ Different Category ♦ Return Rate ♦ American Kestrel Falco Sparerius ♦ Fitness Consequence ♦ Little Infor-mation Exists ♦ Handicap Type ♦ Experimental Handicapping ♦ Natural Selection Theory ♦ Common Handicap
Abstract Natural selection theory suggests that there should be fitness consequences for animals that possess morphological abnormalities such as missing or deformed appendages and other structures. As these characters are expected to be detrimental, morphological abnormalities could be considered ‘‘handicaps’’. However, little infor-mation exists about the nature, prevalence or consequences of naturally occurring handicaps in birds, even though experimental handicapping has been used in some behavioural studies. Here, we document and describe the frequency of natural handicaps in American Kestrels Falco sparerius, and investigate their influence on condition and survival. We considered three different categories of handicap that should negatively impact falcons: missing remiges and rectrices, broken remiges and rectrices, and foot handicaps. Broken feathers, followed by missing feathers, were the most common handicaps detected in kestrels and their prevalence increased through-out the breeding season. Foot handicaps were relatively rare and showed no seasonal trends. There was no effect of any handicap type on body condition or return rates of male kestrels. In contrast, females with either foot handicaps or broken feathers
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study