How to translate text using browser tools
1 December 2015 Breeding Distribution and Population Persistence of Loggerhead Shrikes in a Portion of the North Carolina Sandhills
Douglas B. McNair
Author Affiliations +
Abstract

This study provides the first comparison of historical (1979–1994) and recent (2012–2013) breeding distributions of Lanius ludovicianus (Loggerhead Shrike) at a single location in southeastern North America. I conducted roadside and area searches for Loggerhead Shrikes in the spring (April—early June 2012 and late March—early May 2013) in Richmond County, NC, and small areas of 4 adjacent counties. Most of the study area is within the Sandhills, a subregion of the Coastal Plain. I documented a total of 44–45 breeding territories in 2012–2013, of which 36–38 (82–84%) were in the Sandhills, where I estimated the recent breeding density to be 3.2–3.4 pairs/100 km2. In both years, a smaller percentage of confirmed historic breeding sites were occupied in the Piedmont compared to the Sandhills portion of the study area, and the Piedmont had a much lower breeding density (0.6–0.8 pairs/100 km2). Sixteen of 22 (73%) confirmed historical breeding sites were occupied (n = 10) or retained suitable breeding habitat (n = 6) for Loggerhead Shrikes in 2012–2013. The breeding population in the sampled portion of the Sandhills has apparently declined slowly yet is still fairly stable, an unexpected result based on sharp declines of Loggerhead Shrikes in the Atlantic Coastal Plain for over the past 40 years as documented by coarse-scale surveys (breeding bird surveys, Christmas bird counts, spring bird counts). This study reaffirms the importance of conducting fine-scale surveys to produce a precise estimate of a persistent population in a geographically restricted area.

Douglas B. McNair "Breeding Distribution and Population Persistence of Loggerhead Shrikes in a Portion of the North Carolina Sandhills," Southeastern Naturalist 14(4), 757-770, (1 December 2015). https://doi.org/10.1656/058.014.0418
Published: 1 December 2015
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top