Northern Prairie Wildlife Research Center

An Assessment of Predator Barriers and Predator Control to Enhance Duck Nest Success on Peninsulas

Tables

Table 1. Comparisons among percent (%) species composition of ducks nesting on managed and control peninsulas, between both types of peninsulas, and with % species composition of ducks breeding in the Prairie Pothole Region of North Dakota (ND), 1985-1989.
Species % nesting % breeding in ND P-values
Control Managed Control vs. ND Managed vs. ND Control vs. managed
Mallard
 13 15 21 <0.001 <0.001 0.369
Gadwall
 32 42 15 <0.001 <0.001 0.001
Blue-winged teal
 41 18 28 <0.001 <0.001 <0.001
Northern shoveler
 5 6 13 <0.001 <0.001 0.498
Northern pintail
 6 9 9 0.029 0.999 0.088
Lesser scaup
 3 9 4 0.312 <0.001 <0.001
Other
 1 2 10 <0.001 <0.001 0.237

 

Table 2. Numbers of duck nests, nest success (%), and numbers of young hatched/ha on fenced peninsulas with predator control and on paired control peninsulas in central North Dakota, 1985-1989.
Year Peninsula
pairs (n)		 With fence No fence
Nests (n) Nest success Ducks hatched/ha Nests (n) Nest success Ducks hatched/ha
1985 5 111 44 7.8 14 2 0.3
1986 7 165 46 18.7 23 1 1.4
1987 8 265 54 23.5 34 36 4.4
1988 8 280 70 19.4 23 15 1.4
1989 8 281 58 14.9 22 37 1.4
Total 36 1,102     116    
Symbol - Mean x     54 17.6   17 1.9
SE     2 3.2   7 0.7

 

Table 3. Numbers of duck nests, nest success (%), and numbers of young hatched/ha on moated peninsulas with predator control and on paired control peninsulas in central North Dakota, 1985-1989.
Year Peninsula pairs (n) With moat No moat
Nests (n) Nest success Ducks hatched/ha Nests (n) Nest success Ducks hatched/ha
1985 1 6 100 1.5 1 2 0.0
1986 2 222 61 46.3 62 4 0.6
1987 1 135 79 32.4 60 4 3.5
1988 1 68 70 19.6 14 58 2.7
1989 2 145 51 13.6 45 3 0.4
Total 7 576     182    
Symbol - Mean x     75 21.8   14 1.2
SE     4 6.9   16 0.5

 

Table 4. Mean annual construction and maintenance costs ($) on 8 fenced and 2 moated peninsulas in central North Dakota, 1985-1989.
Activity Fenced Moated
Symbol - Mean x total costs Discount rate Annual costs Symbol - Mean x total costs  Discount rate Annual costs
Construction 7,615      ×       0.109          =          830 206,890    ×        0.090         =       18,620
Maintenance    
  Transportation  165        ×       1.000          =          165 124       ×        1.000          =        124
  Labor  225        ×       1.000          =          225 188       ×        1.000          =        188
  Materials  250        ×       0.155          =           39  80        ×        0.155          =         12
Total   1,259   18,944
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