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Bilateral gynandromorphy in a White-ruffed Manakin (Corapipo altera).

Publication: The Wilson Journal of Ornithology
Publication Date: 01-JUN-07 		Format: Online
Delivery: Immediate Online Access
Full Article Title: Bilateral gynandromorphy in a White-ruffed Manakin (Corapipo altera).(SHORT COMMUNICATIONS)

Article Excerpt
Gynandromorphy is a rare state in which an individual exhibits both male and female traits. This condition often results in a clear bilateral demarcation of male and female morphology in sexually dimorphic species with bilateral symmetry. Gynandromorphy is rare in birds, but has been observed in a number of avian families, and is most commonly re ported in the Fringillidae (Kumerloeve 1987, Patten 1993). The general pattern in gynandromorphs is female plumage characters on the left side and male characters on the right, corresponding to the orientation of the ovary and testis in birds (Crew and Munroe 1938, Kumerloeve 1954). The plumage patterns of avian gynandromorphs can be driven by genetic or hormonal factors, although direct mechanisms are not well known; it is possible that a variety of pathways can lead to the condition (Graves et al. 1996).

A White-ruffed Manakin (Corapipo altera) bilateral gynandromorph was collected on 3 March 2004 near...

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