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Winter Abundance Patterns of Some Songbirds near the 100th Meridian in the Southern United States

Terry L. Root, Mark A. Holmgren and Robert W. Andrews
The Southwestern Naturalist
Vol. 26, No. 2 (May 21, 1981), pp. 95-100
DOI: 10.2307/3671104
Stable URL: http://www.jstor.org/stable/3671104
Page Count: 6
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Winter Abundance Patterns of Some Songbirds near the 100th Meridian in the Southern United States
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Abstract

This study examines winter abundance patterns of three groups of song birds across the south-central United States--the phoebes (Sayornis), thrashers (Toxostoma and Oreoscoptes), and bluebirds (Sialia). The analysis was done on 15 years of National Audubon Society Christmas Bird Count data that were collected in an area encompassing most of Texas, Oklahoma, and part of New Mexico. There was no statistically significant east-west variation in group abundances, but a transition from eastern to western forms within each group occurred between the 98th and 102nd meridians, and the transition was abrupt. A significant biogeographic boundary appears to exist within two degrees on either side of the 100th meridian.

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