Influence of skunk removal on nest success and breeding populations of upland nesting ducks in the Lower Flathead Valley, Montana / Kurt J. Forman.
Material type:
TextSeries: Thesis. (M.S.)Publication details: MT : University of Montana, 1993.Description: viii, 60 leaves : ill. ; 28 cmOnline resources: Abstract: As part of an ongoing study, duck nest success, nest densities, and breeding pair numbers were studied during 1991 and 1992 on the Ninepipe skunk (Mephitis mephitis) removal area and Pablo National Wildlife Refuge (control area) in northwestern Montana. Results were compared with baseline data collected in 1986 and 1987 prior to skunk removal (Hall in prep.). Skunk trapping success (N captures/1000 trap-nights),in 1991 (5) and 1992 (3) was substantially lower than in 1988 (15), the first year of skunk removal (Pengeroth 1991), indicating that skunk densities had declined considerably during the removal period. Although Mayfield nest success varied substantially between years on both study areas, the 1991-92 average at Ninepipe was significantly higher than at Pablo (45% vs. 14%, Z=4.24, P<0.005). Conversely, nest site Visual Obstruction Readings (VORs) were significantly higher at Pablo than at Ninepipe in 1991 (3.9 dm vs. 3.2 dm, t=3.19, P<0.005) and 1992 (4.0 dm vs. 2.8 dm, t=4.67,
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Thesis(M.S.)--University of Montana, 1993.
Includes bibliographical references (leaves 51-56).
As part of an ongoing study, duck nest success, nest densities, and breeding pair numbers were studied during 1991 and 1992 on the Ninepipe skunk (Mephitis mephitis) removal area and Pablo National Wildlife Refuge (control area) in northwestern Montana. Results were compared with baseline data collected in 1986 and 1987 prior to skunk removal (Hall in prep.). Skunk trapping success (N captures/1000 trap-nights),in 1991 (5) and 1992 (3) was substantially lower than in 1988 (15), the first year of skunk removal (Pengeroth 1991), indicating that skunk densities had declined considerably during the removal period. Although Mayfield nest success varied substantially between years on both study areas, the 1991-92 average at Ninepipe was significantly higher than at Pablo (45% vs. 14%, Z=4.24, P<0.005). Conversely, nest site Visual Obstruction Readings (VORs) were significantly higher at Pablo than at Ninepipe in 1991 (3.9 dm vs. 3.2 dm, t=3.19, P<0.005) and 1992 (4.0 dm vs. 2.8 dm, t=4.67,