North American Birds

VOLUME 69 No1 2016

A Quarterly Journal of Ornithological Record Published by the American Birding Association. The mission of the journal is to provide a complete overview of the changing panorama of our continent’s birdlife.

Issue link: http://nab.aba.org/i/629070

Contents of this Issue

Navigation

Page 11 of 179

Figure 4. Breeding and winter ranges of shrike taxa considered for the identifcation of the Mendocino shrike, along with zones of overlap and hybridization be- tween Red-backed Shrike and other taxa. The hybridization zone between Red-backed and Turkestan Shrikes is rather extensive, whereas only occasional hybrids between Red-backed and Isabelline Shrikes and between Red-backed and Brown Shrike have been observed (see text). The two hybrid zones overlap in the Altai range of south-central Russia, an area where all four species of this assemblage occur and may introgress. Graphic by Shane Feirer, based on Figure 1 in Worfolk (2000), with added detail on the hybridization zones from Kryukov and Gureev (1997), Panov et al. (2011), and V. Dinets and A. Kryukov (pers. comm.). Figure 5. Red-backed Shrike specimen AMNH 661048, collected 7 February 1905 in Angola, Africa, showing bidirectional primary replacement during the preformative molt, likely from a node at p5 (p1-p2 and p8-p10 remain as juvenile feathers). Brown Shrike has been reported to undergo such bidirectional replacement of primaries during both preformative and prebasic molts, whereas Red- backed, Turkestan, and Isabelline Shrikes have been reported to only undergo distal replacement from p1 during these molts (Stresemann and Stresemann 1971, 1972; Cramp and Perrins 1993). Specimen ex- amination for this paper, however, indicates that all four species can demonstrate either strategy, with the majority of individuals undergoing bidirectional replacement (see text). Photograph by Peter Pyle. 10 N O R T H A M E R I C A N B I R D S T H E M E N D O C I N O S H R I K E p1 p2 p3 p4 p5 p6 p7 p8 p9 p10

Articles in this issue

Archives of this issue

view archives of North American Birds - VOLUME 69 No1 2016