Download Discern Limiting Factors

WEST GULF COASTAL PLAIN
Waterfowl Working Group
Randy Wilson, LMVJV Office
Chad Manlove, DU – Southern Regional Office
Andrew James, AGFC
Rich Johnson, AGFC
Tom Edwards, USFWS – Arkansas
Alan Stacey, ODWC
Jim Neal, USFWS – Texas
Scott Durham, LDWF
Pat Stinson, USFWS – Mississippi
Kevin Kraai, TPWD
Bill Bartush, DU – East Texas
Conserving, Restoring, and Maintaining WGCP Capacity
to Winter Mid-Continent Waterfowl Populations
Biological
Foundation
Identify Species of Concern
Establish Population Targets
Discern Limiting Factors
Establish Objectives to Counter Limiting Factors
Identify Species of Concern (Wintering)
American Black Duck
American Wigeon
Mallard
Gadwall
Green-winged Teal
Blue-winged Teal
Northern Pintail
Northern Shoveler
Wood Duck
Mottled Duck
Canvasback
Redhead
Ring-necked Duck
Scaup (greater and lesser)
Bufflehead
???
Identify Species of Concern (Breeding)
Black-bellied Whistling Duck
Mottled Duck
Hooded Merganser
Wood Duck
???
Conserving, Restoring, and Maintaining WGCP Capacity
to Winter Mid-Continent Waterfowl Populations
Biological
Foundation
Identify Species of Concern
Establish Population Targets
Discern Limiting Factors
Establish Objectives to Counter Limiting Factors
Establish Population Targets
Step 1. Winter Distribution of Ducks Among States
Mid-Winter Inventory Data January 1970-79
Step 2. Winter Distribution of Ducks Within States
Harvest Data January 1970-79
Selection of Counties for Calculation
of
Waterfowl Population Goals
LMVJV Boundary
WGCP BCR
Questionable Counties
Establish Population Targets
Target state =
Pstate * PWGCPstate * Goalcontinental
0.85 (winter mortality rate)
Dabblers
& Divers
Wood
Ducks
Total
Arkansas
Louisiana
Oklahoma
Texas
313,871
1,300,583
138,544
778,393
131,050
457,530
31,560
188,000
444,921
1,758,113
170,104
966,393
Total
2,531,391
808,140
3,339,531
State
Conserving, Restoring, and Maintaining WGCP Capacity
to Winter Mid-Continent Waterfowl Populations
Biological
Foundation
Identify Species of Concern
Establish Population Targets
Discern Limiting Factors
Establish Objectives to Counter Limiting Factors
Discern Limiting Factors
Factors Limiting Carrying Capacity
Disease
Predation
Environmental Contaminants
Disturbance
Foraging
Habitat
Non-foraging
Conserving, Restoring, and Maintaining WGCP Capacity
to Winter Mid-Continent Waterfowl Populations
Biological
Foundation
Identify Species of Concern
Establish Population Targets
Discern Limiting Factors
Biological Model
Establish Objectives to Counter Limiting Factors
Biological Model
Assume all ducks are Mallard-sized
Assume that ducks stay for 110-day wintering period
Conserving, Restoring, and Maintaining WGCP Capacity
to Winter Mid-Continent Waterfowl Populations
Biological
Foundation
Identify Species of Concern
Establish Population Targets
Discern Limiting Factors
Biological Model
Establish Objectives to Counter Limiting Factors
Establish Objectives to Counter Limiting Factor
Habitat Objectives in Duck-Use Days
Habitat Objectives = Targetstate * 110winter days
Dabblers
& Divers
Wood
Ducks
Arkansas
Louisiana
Oklahoma
Texas
34,525,804
143,064,069
15,239,751
85,623,268
14,415,500
50,328,300
3,471,600
20,680,000
48,941,304
193,392,370
18,711,351
106,303,268
Total
278,452,892
88,896,300
367,348,293
State
Total
Key Waterfowl Issues
1. Identification of Species of Concern
2. Discern Limiting Factors
3. Establish Population Targets
Inclusion / Exclusion of Counties
4. Develop Biological Models
5. Establish Objectives to Counter
Limiting Factors
6. Measure Existing Conditions
(e.g., conduct habitat inventory)
Habitat Inventory
Important Habitat Types in the WGCP
Bottomland Hardwoods
Moist Soil Wetlands
Agricultural Crops
Submerged Aquatic Vegetation
What are the current management capabilities on
Public Lands?
Private Lands?
Habitat Inventory
How much naturally flooded habitat can be expected
in a given year?
How many acres of open aquatic habitat are available?
Ponds (small, medium, large)
Lakes
Reservoirs
Current research?
Waterfowl Use of stock ponds
Foraging Behavior
Food Availability
Allocation of Duck-use Days in the West Gulf Coastal Plain
30,000,000
Duck-use Days
25,000,000
20,000,000
15,000,000
10,000,000
5,000,000
0
Arkansas
Natural Flood
Open Aquatic
Louisiana
Texas
Public Managed
Private Managed (MIP)
Oklahoma
Private Managed (MOP)
Allocation of duck-use days in Oklahoma
Dabbler DUD Target = 15,120,439
Managed Habitat
65%
9,828,285
Public Managed Private Managed
60%
40%
5,896,971
3,931,314
Habitat Categories
Natural Flood Open Aquatic
% Allocation
20%
15%
DUDs Needed
3,024,088
2,268,066
DUD / acre value
400
400
Acres Needed
7,560
5,670
Annual Performance
DUD Target w/ Perf.
Accomplishments
DUD Surplus / Deficit
DUD / acre value
Acres Surplus / Deficit
Note: We used 1/2 the moist-soil energetic value of 1,386 dud/ac on private
due to a consensus of poor management practices (food production).
75%
7,862,628
7,434,541
-428,087
1,386
-309
lands
Summary of public lands allocation.
Total Current Acres
Total Current DUD
Total Planned Acres
Total Planned DUD
Total DUD (current+planned)
Total DUD Deficit
Moist Soil Acres Needed
6,412
7,434,541
450
241,300
7,675,841
186,787
135
50%
7,862,628
6,972,273
-890,355
693
-1,285
Allocation of duck-use days in Texas
Dabbler DUD Target =
53,214,026
Habitat Categories
% Allocation
DUDs Needed
DUD / acre value
Acres Needed
Annual Performance
DUD Target w/ Perf.
Accomplishments
Planned
DUD Surplus / Deficit
DUD / acre value
Acres Surplus / Deficit
Natural Flood
50%
26,607,013
400
66,518
Open Aquatic
10%
5,321,403
400
13,304
Managed Habitat
40%
21,285,610
Private Managed
Public Managed
MIP
MOP
20%
60%
20%
4,257,122
12,771,366
4,257,122
75%
5,676,163
2,466,774
2,302,146
-907,243
1,386
-655
Summary of public lands allocation.
Total Current Acres
3,061
Total Current DUD
2,466,774
Total Planned Acres
1,661
Total Planned DUD
2,302,146
Total Planned and Current DUD
4,768,920
Public lands still needs 907,243 dud (655ac of moist soil)
to meet its objective on public lands.
75%
17,028,488
4,300,000
50%
8,514,244
13,860,000
-12,728,488
1,386
-9,184
5,345,756
1,386
3,857
Allocation of duck-use days in Louisiana
Dabbler DUD Target = 51,093,649
Managed Habitat
45%
22,992,142
Public Managed Private Managed
50%
50%
11,496,071
11,496,071
Habitat Categories
Natural Flood Open Aquatic
% Allocation
30%
25%
DUDs Needed
15,328,095
12,773,412
DUD / acre value
400
400
Acres Needed
38,320
31,934
Annual Performance
75%
DUD Target w/ Perf.
15,328,095
Accomplishments
7,031,606
DUD Surplus / Deficit
-8,296,489
DUD / acre value
1,386
Acres Surplus / Deficit
-5,986
Note: We used 1/2 the moist-soil energetic value of 1,386 dud/ac on private lands
due to a consensus of poor management practices (food production).
Summary of public lands allocation.
Total
Total
Total
Total
Total
Total
Moist
Current Acres
Current DUD
Planned Acres
Planned DUD
DUD (current+planned)
DUD Deficit
Soil Acres Needed
5,383
6,546,506
350
485,100
7,031,606
-8,296,489
-5,986
50%
22,992,142
3,331,654
-19,660,488
693
-28,370
Allocation of duck-use days in Arkansas
Dabbler DUD Target = 32,730,860
Managed Habitat
70%
22,911,602
Public Managed
MIP
60%
30%
13,746,961
6,873,481
MOP
10%
2,291,160
75%
9,164,641
10,634,804
1,470,163
693
2,121
50%
4,582,320
27,720,000
23,137,680
1,386
16,694
Habitat Categories
Natural Flood Open Aquatic
% Allocation
20%
10%
DUDs Needed
6,546,172
3,273,086
DUD / acre value
400
400
Acres Needed
16,365
8,183
Annual Performance
75%
DUD Target w/ Perf.
18,329,282
Accomplishments
13,981,489
DUD Surplus / Deficit
-4,347,793
DUD / acre value
1,386
Acres Surplus / Deficit
-3,137
Note: We used 1/2 the moist-soil energetic value of 1,386 dud/ac on private lands
due to a consensus of poor management practices (food production).
Summary of public lands allocation.
Total
Total
Total
Total
Total
Total
Moist
Current Acres
Current DUD
Planned Acres
Planned DUD
DUD (current+planned)
DUD Deficit
Soil Acres Needed
48,461
12,970,111
2,023
1,011,378
13,981,489
-4,347,793
-3,137