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Lecture_12-1 - Reasons for molt 1 Replacement of worn...

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Lecture 12 Notes Birds have many different types of feathers: Filoplume – bare rachis with tuft at the top – associated with flight feathers – many nerve endings Bristle – bare rachis – functional equivalent of eyelash or whisker Semiplume – have a rachis - short fluffy feather functions as insulation Down – no rachis – short fluffy feathers that function as insulation Contour feathers – outer feathers covering the body 3 types – flight feathers (remiges), tail feathers (rectrices), and body feathers Contour feathers have structural components: Macrostructure – vane, rachis, & calamus Microstructure – barbs which include the ramus, barbules, and hooklets Feather color can vary based on: Sex Age Season Molt = the loss and regrowth (replacement) of feathers
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Unformatted text preview: Reasons for molt: 1. Replacement of worn feathers 2. Change the color and shape of feathers Molting cycles: Prejuvenal molt – 1 st molt of a bird’s life – natal down replaced by juvenal plumage Prebasic molt – juvenal or alternate plumage replaced with “non-breeding” plumage. This is always a complete molt (all feathers). Usually occurs in winter Prealternate molt – basic plumage replaced with “breeding” plumage. Usually occurs in summer. Thyroid hormones are important for all three types of molt. Molt Patterns: 1. Complete prebasic Complete prealternate (rare) 2. Complete prebasic Partial prealternate 3. Complete prebasic No prealternate...
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  • Spring '09
  • Navara
  • Feather, Prealternate molt, plumage Prebasic molt, insulation Contour feathers, Age Season Molt, feathers Molting cycles

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Lecture_12-1 - Reasons for molt 1 Replacement of worn...

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