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Monday, January 25 • 10:40am - 11:00am
Snapshot Comparison of Wood Turtle Population Size and Structure Between 1990 and 2015 in Minnesota

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AUTHORS: Donald J. Brown*, West Virginia University, Morgantown; Madaline M. Cochrane, University of Minnesota-Duluth; Mark D. Nelson, U.S. Forest Service; Richard R. Buech, U.S. Forest Service (Retired); Ron A. Moen, University of Minnesota-Duluth

ABSTRACT: The wood turtle Glyptemys insculpta is a species of conservation concern throughout its geographic distribution, and is currently a candidate under consideration for listing as federally threatened or endangered. Several studies have documented severe population declines for this species in recent decades. We performed a snapshot comparison study to determine if the size and structure of a population in Minnesota has changed over the last 25 years. Using baseline survey data collected in spring of 1990, we resurveyed 12 sites along a 40-km stretch of river in spring of 2015. We used paired randomization tests to determine if relative abundance, sex ratio, adult-juvenile ratio, and turtle size (i.e., carapace length) differed between the two survey years. A total of 45 individuals were captured during the 1990 survey (mean per site = 3.75), and a total of 50 individuals were captured during the 2015 survey (mean per site = 4.17), which was not significantly different. We also found that population structure was similar between the two survey years. Our results indicate the population we studied has not declined over the past 25 years.

Monday January 25, 2016 10:40am - 11:00am EST
Emerald B