Survival of white-tailed deer fawns in the grasslands of the northern Great Plains

Authors

  • Troy W. Grovenburg,

    Corresponding author
    1. Department of Natural Resource Management, South Dakota State University, Box 2140B, NPB Room 138, Brookings, SD 57007, USA
    • Department of Natural Resource Management, South Dakota State University, Box 2140B, NPB Room 138, Brookings, SD 57007, USA
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  • Robert W. Klaver,

    1. U.S. Geological Survey, Earth Resources Observation and Science (EROS) Center, 47914 252nd Street, Sioux Falls, SD 57198, USA
    Current affiliation:
    1. Iowa Cooperative Fish and Wildlife Unit, Department of Natural Resource Ecology and Management, 338 Science II, Iowa State University, Ames, IA 50011, USA
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  • Jonathan A. Jenks

    1. Department of Natural Resource Management, South Dakota State University, Brookings, SD 57007, USA
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  • Associate Editor: Eric Hellgren

Abstract

Environmental factors, such as forest characteristics, have been linked to fawn survival in eastern and southern white-tailed deer (Odocoileus virginianus) populations. In the Great Plains, less is known about how intrinsic and habitat factors influence fawn survival. During 2007–2009, we captured and radiocollared 81 fawns in north-central South Dakota and recorded 23 mortalities, of which 18 died before 1 September. Predation accounted for 52.2% of mortality; remaining mortality included human (hunting, vehicle, and farm accident; 26.1%) and hypothermia (21.7%). Coyotes (Canis latrans) accounted for 83.3% of predation on fawns. We used known-fate analysis in Program MARK to estimate summer (15 May–31 Aug) survival rates and investigated the influence of intrinsic and habitat variables on survival. We developed 2 a priori model sets, including intrinsic variables and a test of annual variation in survival (model set 1) and habitat variables (model set 2). Model set 1 indicated that summer survival varied among years (2007–2009); annual survival rates were 0.94 (SE = 0.06, n = 22), 0.78 (SE = 0.09, n = 27), and 0.54 (SE = 0.10, n = 32), respectively. Model set 2 indicated that survival was further influenced by patch density of cover habitats (Conservation Reserve Program [CRP]-grasslands, forested cover, and wetlands). Mean CRP-grassland and wetland patch density (no. patches/100 ha) were greater (P < 0.001) in home-range areas of surviving fawns (equation image = 1.81, SE = 0.10, n = 63; equation image = 1.75, SE = 0.14, n = 63, respectively) than in home-range areas of fawns that died (equation image = 0.16, SE = 0.04, n = 18; equation image = 1.28, SE = 0.10, n = 18, respectively). Mean forested cover patch density was less (P < 0.001) in home-range areas of surviving fawns (equation image = 0.77, SE = 0.10, n = 63) than in home-range areas of fawns that died (equation image = 1.49, SE = 0.21, n = 18). Our results indicate that management activities should focus on CRP-grassland and wetland habitats in order to maintain or improve fawn survival in the northern Great Plains, rather than forested cover composed primarily of tree plantings and shelterbelts. © 2012 The Wildlife Society.

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