apterium


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apterium

[ap′tir·ē·əm]
(vertebrate zoology)
A bare space between feathers on a bird's skin.
References in periodicals archive ?
That passerines re-feather their ventral apterium in the post breeding molt is well known, but the dynamics of cuckoo brood patches have not been described (Bailey 1952, Jones 1971).
We summarize five kinds of data bearing on migratory double breeding in this paper: 1) the abundance of these three species in coastal Sinaloa in June; 2) the status of the ventral apterium for chats and orioles examined in late May and early June in northwest Mexico; 3) nesting by these same two species in May and June; 4) the status of the ventral apterium for cuckoos arriving in or migrating through coastal Sinaloa in June of 2011; and, 5) the annual cycle of the ventral apterium in Yellow-billed Cuckoos.
For female chats and orioles that were netted and released, we recorded the condition of the ventral apterium to determine if they were either incubating (edematous and fully defeathered ventral apterium), laying or about to lay (de-feathering ventral apterium), or had not yet laid but were at their presumed breeding sites (little or no fat and downy ventral apterium).
To determine the annual cycle of feathering (or lack thereof) on the ventral apterium of Yellow-billed Cuckoos, we borrowed winter-collected specimens of this species from most major museums in the USA (see Acknowledgments).