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Assessment of a Mallard Model in
Minnesota's Prairie Coteau

Appendix D


Quantification of wetland acreage and the percent of wetland cover suitable for mallard nesting in different wetland classes for 3 southwestern Minnesota study sites, 1990-92.

The mallard model requires the user to specify, as variable inputs, the percentage of wetland cover that is suitable for nesting by mallards for each class or type of wetland considered in the modeled area (Mack 1991). These values are treated as constants for all wetlands in a given class during a model run. We used default values that indicated 84, 46, 34, and 12% of the temporary, seasonal, semipermanent, and permanent wetlands, respectively, were suitable for mallard nesting. These values have been used previously in western Minnesota (T. Shaffer, U.S. Geol. Survey, pers. commun.). Suitable nesting habitat varies among basins and within a season depending on topography and precipitation patterns. Determination of the proportion of all basins in a class that is suitable for nesting is difficult. We considered temporary, seasonal, semi-permanent, and permanent wetland classes in our modeling. We determined the number of acres in each wetland class (Tables D-1 to D-3) using National Wetland Inventory files by equating the modifier portion of the wetland polygon definition (Cowardin et al. 1979) with wetland classes (sensu Stewart and Kantrud 1971). We determined the proportion of the acreage in each wetland class that was suitable for mallard nesting by examining the full wetland polygon definition; any polygon having emergent vegetation was considered suitable for nesting (Table D-4).

Table D-1. National Wetlands Inventory Wetland polygons (i.e., types) on the Ivanhoe study site and their suitability for nesting by mallards determined using calssification definitions from Cowardin et al. (1979), 1990-92.
Polygon calssification Water regime modifier Hectares Suitable for nesting
L1UBH Permanent 92.7 No
L2UBG Permanent 9.4 No
L2UBGx Permanent 2.1 No
PEMF Semi-perm 35.7 Yes
PEMFd Semi-perm 73.5 Yes
PEMFx Semi-perm tra Yes
PUBF Semi-perm 2.5 No
PUBG Semi-perm 16.2 No
R4SBF Semi-perm 0.3 No
R4SBFx Semi-perm 8.7 No
PEMC Seasonal 20.8 Yes
PEMCd Seasonal 148.2 Yes
PEMCx Seasonal 0.6 Yes
PFO1C Seasonal 1.5 No
R4SBCx Seasonal 9.9 No
PEMA Temporary 12.2 Yes
PEMAd Temporary 68.2 Yes
PEMAx Temporary 0.6 Yes
PFO1A Temporary 0.6 No
a < 0.05 hectare.

Table D-2. National Wetlands Inventory Wetland polygons (i.e., types) on the Slayton study site and their suitability for nesting by mallards determined using calssification definitions from Cowardin et al. (1979), 1990-92.
Polygon calssification Water regime modifier Hectares Suitable for nesting
L1UBH Permanent 25.5 No
PEMF Semi-perm 37.7 Yes
PEMFd Semi-perm 32.1 Yes
PUBF Semi-perm 3.7 No
PUBFd Semi-perm 1.4 No
PUBFh Semi-perm 0.1 No
PUBFx Semi-perm 8.5 No
PUBGd Semi-perm 3.6 Yes
PUBGh Semi-perm 0.2 No
PUBGx Semi-perm 1.7 No
R4SBF Semi-perm 9.8 No
PEMC Seasonal 47.1 Yes
PEMCd Seasonal 60.3 Yes
PEMCx Seasonal 2.5 Yes
PFO1C Seasonal 0.1 No
PSS1C Seasonal 1.4 Yes
PEMA Temporary 7.8 Yes
PEMAd Temporary 7.1 Yes

Table D-3. National Wetlands Inventory Wetland polygons (i.e., types) on the Windom study site and their suitability for nesting by mallards determined using calssification definitions from Cowardin et al. (1979), 1990-92.
Polygon calssification Water regime modifier Hectares Suitable for nesting
L1UBH Permanent 178.0 No
PEMF Semi-perm 63.0 Yes
PEMFd Semi-perm 7.5 Yes
PEMFx Semi-perm 0.1 Yes
PUBF Semi-perm 1.5 No
PUBFh Semi-perm 0.3 No
PUBFx Semi-perm 0.2 No
PUBG Semi-perm 0.7 No
PUBG1 Semi-perm 0.1 No
PUBGH Semi-perm 0.8 No
PUBGx Semi-perm 0.4 No
R2UBG Semi-perm 4.4 No
R2UBGx Semi-perm 6.6 No
R4SBF Semi-perm 1.1 No
PEMC Seasonal 91.5 Yes
PEMCd Seasonal 12.9 Yes
PEMCx Seasonal 0.4 Yes
PFO1C Seasonal 5.8 No
PFO1Cd Seasonal 5.8 No
PSS1Cd Seasonal 0.4 Yes
R2USC Seasonal 2.9 No
R4SBC Seasonal 16.0 No
PEMA Temporary 2.2 Yes

Table D-4. Percent of each wetland class (sensu Stewart and Kantrud 1971) suitable for nesting by mallards on 3 study sites in southwestern Minnesota, 1990-92.
  Class
Site Permanenta Semi-permanent Seasonal Temporary
Ivanhoe 0.0 78.6 92.9 99.2
Slayton 0.0 74.2 99.9 100.0
Windom 0.0 81.3 76.7 100.0
aBecause of a programming problem in the Mallard Model the value for percent suitable for nesting cannot be 0 (Mack 1991:26). In the models, we set the percent of permanent wetlands suitable for mallard nesting at 1%.


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