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Documents disponibles écrits par cet auteur (6)
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Article
M. S. Monroe, Auteur ; G. Ritchison, AuteurPopulations of Henslow's Sparrows (Ammodramus henslowii) arc declining, and loss of habitat is a likely factor. Coal mine reclamation has created grassland habitat in Kentucky and elsewhere, and information is needed concerning the use of these [...]
Article
B. Sutter, Auteur ; G. Ritchison, AuteurPopulations of Grasshopper Sparrows (Ammodramus savannarum) have been declining, and agricultural practices, such as grazing by domestic cattle (Bos taurus), are likely contributing factors. Grazing call alter the composition and structure of ve[...]
Article
S. W. Cooper, Auteur ; G. Ritchison, AuteurIn birds, males and females may benefit by choosing mates based on morphological characteristics correlated with their ability to provide parental care. Our objective was to examine possible relationships between morphological characteristics an[...]
Article
H. L. Mays, Auteur ; K. J. McGraw, Auteur ; G. Ritchison, Auteur ; S. Cooper, Auteur ; V. Rush, Auteur ; R. S. Parker, AuteurSexual dimorphism or dichromatism has long been considered the result of sexual selection. However, for many organisms the degree to which sexual dichromatism occurs has been determined within the confines of human perception. For birds, objecti[...]
Article
J. V. Gorrell, Auteur ; G. Ritchison, Auteur ; E. S. Morton, AuteurLong-term pair bonds and defense of territories year-round are common among tropical passerines. The boundaries of these territories tend to be stable, perhaps reflecting the need to defend an area that, regardless of conditions, provides suffic[...]
Article
B. O. Huntsman, Auteur ; G. Ritchison, AuteurFive male Eastern Bluebirds (Sialia sialis) were observed and songs recorded over entire breeding seasons in central Kentucky. Songs consisted of an average of 3.02 notes and the mean time between the beginning of successive songs within a bout [...]
