Wegan M.T.,562 East Stoll Road |
Etter D.R.,562 East Stoll Road |
Belant J.L.,Mississippi State University |
Beyer Jr. D.E.,Wildlife Division |
And 2 more authors.
Wildlife Society Bulletin | Year: 2014
Weevaluated a cable neck-restraint for live capture of coyotes (Canis latrans) in Michigan, USA, from 6 January to 22 March 2011. We documented capture efficiency, selectivity, and animal welfare using criteria developed by the Association of Fish and Wildlife Agencies Best Management Practices and the International Organization for Standardization. We constructed cable restraints with an 8.9-cm-diameter minimum loop stop and reverse bend washer locks drilled to 4.8 mm, to more readily relax on 2.4-mmdiameter steel cable. Cable restraints were set for 938 trap-nights during January-March 2011. Capture efficiency was 71.4% (n=20 coyotes) and selectivity 95.0%. We performed necropsies (n=11) or external examinations (n=9) to evaluate capture-related injuries and released coyotes fitted with Global Positioning System collars (n=5) to estimate home-range size. Mean individual injury score of necropsied coyotes was 5.0±SD 8.9 and mean total injury score was 7.3±SD 9.8; we observed no mortality of coyotes due to capture. Home range sizes of 2 coyotes (8.9km2 and 16.6 km2) were within the 95% confidence interval ofmean homerange size of resident coyotes captured in foothold traps (16.0km2±SD 5.7, n=11). Our findings indicate this cable restraint configuration exceeds all Best Management Practices criteria and is suitable for the capture of coyotes in both wildlife management and research arenas. © 2014 The Wildlife Society.
Shirkey B.T.,Michigan State University |
Luukkonen D.R.,562 East Stoll Road |
Winterstein S.R.,Michigan State University
Journal of Great Lakes Research | Year: 2014
Lake St. Clair and western Lake Erie are important migration staging areas for diving ducks including canvasbacks (Aythya valisineria), redheads (Aythya americana), and lesser and greater scaup (Aythya affinis and Aythya marila). Starting in 1983, the Michigan Department of Natural Resources (MDNR) attempted to census diving ducks on the United States portion of Lake St. Clair throughout autumn migration; however, in 2010 the MDNR expanded the traditionally surveyed area to include all of Lake St. Clair and a portion of western Lake Erie. The idea of achieving a census over the expanded study area was unrealistic, and instead distance sampling techniques were adopted in an effort to generate statistically valid estimates of detection probabilities and abundances for diving ducks during spring and autumn migration. We found distance sampling techniques to be a viable option for estimating diving duck abundance as long as flock size is accounted for as a covariate affecting the detection function. Diving ducks were generally more abundant on our study area during autumn migration with a mean of 306,327. ducks/survey (SE=40,729) compared to an average spring abundance of 91,053. ducks/survey (SE=19,175). Peak abundance occurred on 20 November 2012 with an estimated 596,335 diving ducks on Lake St. Clair and western Lake Erie. Ultimately, our methodology could be used to establish long-term, standardized data collection techniques and applied to conservation planning for waterfowl in the Great Lakes region. © 2014 Elsevier B.V.