fate of feathers fallspring. natal and juvenal plumages (natal down feathers, juvenal feathers)
TRANSCRIPT
One Complete Molt per Year
•Chickadees •Flycatchers •Hawks •Humingbirds •Jays
•Owls •Swallows •Thrushes •Vireos •Woodpeckers
Delayed Plumage Maturation
First BreedingSeason
Second BreedingSeason
FEMALE MALE
SubadultDefinitive
Definitive Definitive
Delayed Plumage MaturationMALE
Subadult
Definitive
Why?
Female Mimicry Hypothesis
Status Signaling Hypothesis
Winter Crypsis Hypothesis
3
Natal DownPlumage
Juvenal Plumage
Traditional Plumage Naming Systems
Nuptial Plumage
Winter Plumage(Post-Nuptial Plumage)
3
Traditional Plumage Naming Systems
Prenuptial Molt
Postnuptial Molt
Postnatal MoltPostjuvenal
Molt
Traditional Plumage Naming Systems: Problems
• Different Plumages not always Correlatedwith Breeding Behavior
• No “Winter” Season in Tropics
• Some Birds breed More or Less thanOnce a Year
3
Natal DownPlumage
Juvenal Plumage
Humphrey-Parkes Plumage Naming Systems
Alternate Plumage
Basic Plumage
3
Traditional Plumage Naming Systems
Prealternate Molt
Prealternate Molt
Prejuvenal MoltPrebasic Molt
Applications of Humphrey-Parkes System
Alternate Plumage
http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1023&context=icwdmwfm
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