Western Bluebird (Sialia mexicana)

2020 ◽  
Author(s):  
Judith A. Guinan ◽  
Patricia A. Gowaty ◽  
Elsie K. Eltzroth
Keyword(s):  
Sialia Mexicana

Western Bluebird (Sialia mexicana)

2008 ◽  
Author(s):  
Judith A. Guinan ◽  
Patricia A. Gowaty ◽  
Elsie K. Eltzroth
Keyword(s):  
Sialia Mexicana

LIFE-HISTORY VARIATION AND DEMOGRAPHY IN WESTERN BLUEBIRDS (SIALIA MEXICANA) IN OREGON

The Auk ◽  
2004 ◽  
Vol 121 (1) ◽  
pp. 118 ◽  
Author(s):  
Amber J. Keyser ◽  
Marilynne T. Keyser ◽  
Daniel E. L. Promislow
Keyword(s):  
Life History ◽  
Life History Variation ◽  
Sialia Mexicana ◽  
Western Bluebirds

scholarly journals Mechanisms of evolutionary change in structural plumage coloration among bluebirds ( Sialia spp.)

2006 ◽  
Vol 3 (9) ◽  
pp. 527-532 ◽  
Author(s):  
Matthew D Shawkey ◽  
Susan L Balenger ◽  
Geoffrey E Hill ◽  
L. Scott Johnson ◽  
Amber J Keyser ◽  
...  
Keyword(s):  
Outer Cortex ◽  
Sialia Sialis ◽  
Sialia Mexicana ◽  
Transmission Electron ◽  
Spongy Layer ◽  
Eastern Bluebirds ◽  
Evolutionary Changes ◽  
Mountain Bluebirds ◽  
Production Mechanisms ◽  
Dark Blue

Combinations of microstructural and pigmentary components of barbs create the colour displays of feathers. It follows that evolutionary changes in colour displays must reflect changes in the underlying production mechanisms, but rarely have the mechanisms of feather colour evolution been studied. Among bluebirds in the genus Sialia , male rump colour varies among species from dark blue to light blue while breast colour varies from blue to rusty. We use spectrometry, transmission electron microscopy and Fourier analysis to identify the morphology responsible for these divergent colour displays. The morphology of blue rump barbs is similar among the three species, with an outer keratin cortex layer surrounding a medullary ‘spongy layer’ and a basal row of melanin granules. A spongy layer is also present in blue breast barbs of mountain bluebirds Sialia currucoides and in rusty breast barbs of western Sialia mexicana and eastern bluebirds Sialia sialis . In blue barbs melanin is basal to the spongy layer, but is not present in the outer cortex or spongy layer, while in rusty barbs, melanin is present only in the cortex. The placement of melanin in the cortex masks expression of structural blue, creating a rusty display. Such shifts in microstructures and pigments may be widespread mechanisms for the evolutionary changes in the colours of feathers and other reflective structures across colourful organisms.

Enteritis as a Cause of Mortality in the Western Bluebird (Sialia mexicana)

2001 ◽  
Vol 45 (3) ◽  
pp. 760 ◽  
Author(s):  
R. J. Bildfell ◽  
E. K. Eltzroth ◽  
J. G. Songer
Keyword(s):  
Sialia Mexicana

New data on systematics of the quill mites of the genus Syringophiloidus Kethley, 1970 (Acari, Syringophilidae) from North American birds

2009 ◽  
Vol 54 (1) ◽  
Author(s):  
Maciej Skoracki ◽  
Maureen Flannery ◽  
Greg Spicer
Keyword(s):  
New Species ◽  
Molothrus Ater ◽  
Turdus Migratorius ◽  
American Robin ◽  
Cardinalis Cardinalis ◽  
Northern Cardinal ◽  
Sialia Mexicana ◽  
Thryothorus Ludovicianus ◽  
Carolina Wren ◽  
Melanerpes Formicivorus

AbstractSix species of the syringophilid mites belonging to the genus Syringophiloidus Kethley, 1970 (Acari, Prostigmata) are recorded from eight avian hosts from USA. Four new species are described and illustrated: S. molothrus sp. nov. from the Brown-headed Cowbird Molothrus ater (Boddaert) (Passeriformes, Icteridae), S. carolae sp. nov. from the Acorn Woodpecker Melanerpes formicivorus (Swainson) (Piciformes, Picidae) and from the Northern Cardinal Cardinalis cardinalis (Linnaeus) (Passeriformes, Cardinalidae), S. sialius sp. nov. from the Western Bluebird Sialia mexicana Swainson (Passeriformes, Turdidae), and S. thryothorus sp. nov. from the Carolina Wren Thryothorus ludovicianus (Latham) (Passeriformes, Troglodytidae). The previously described species S. motacillae Bochkov et Mironov, 1998 is new for USA. Two host species, the American Robin Turdus migratorius Linnaeus (Turdidae) and the Steller’s Jay Cyanocitta stelleri (Gmelin) (Passeriformes, Corvidae), are new for S. presentalis Chirov et Kravtsova, 1995.

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