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How Much Habitat Management is Needed to Meet Mallard Production Objectives?

Figures


Maps of Plots 601 and 701
Figure 1. Habitat maps of plots with centrally located predator barrier fences. Cropland includes existing CRP cover; other includes hayland, odd areas such as field corners, planted cover, right-of-ways, scrub, and woodland.

 

Graph of recriuts produced vs. % of plot fenced for  601. Graph of recruits produced vs. % of plot fenced for 701
Figure 2. Simulated production of recruits on Plots 601 and 701 when amount of the plot fenced varied from 0 - 35%. Plot 601 had 35% grassland and Plot 701 had 5% grassland.
Graph of recruits produced vs. % of plot in CRP cover for 601. Graph of recruits produced vs. % of plot in CRP cover for 701.
Figure 3. Simulated production of recruits on Plots 601 and 701 when amount of the plot in CRP cover in the plot varied from 0 - 35%. Plot 601 had 35% grassland and Plot 701 had 5% grassland.
Graph of recruits produced vs. % of plot managed for 701.
Figure 4. Simulated production of recruits on Plot 701. Plot had predator fence, and CRP cover varied from 0 - 35%.

 

Graph of benefit vs. cost for predator fencing.
Figure 5. Benefit-cost analysis for adding predator fencing to a hypothetical 2-habitat plot containing grassland and fenced cover. Straight lines illustrate cost for obtaining $35,000 worth of ducks given breeding populations of 500 and 600 pairs. The rightmost end of the curves represent treating 25% of the plot (At= 0.25).

 

Graph of benefit vs. cost for CRP cover.
Figure 6. Benefit-cost analysis for adding CRP cover to a hypothetical 2-habitat plot containing grassland and CRP cover. Straight lines illustrate benefit and cost at maximum net benefit for a breeding population of 500 pairs. The rightmost end of the curves represent treating 50% of the plot (At= 0.05).

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