billy minser ut fwffwf.ag.utk.edu/mgray/wfs560/minser_presentation.pdf · there are 55 species of...
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Nesting Ducks of TennesseeWood Ducks, Mallards, Hooded
MergansersBilly Minser
UT FWF
AcknowledgementsFrank C. Bellrose & Daniel Holm
Dick McCabeFeaturing Frank Bellrose and
Scott Neilson
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There are 55 species of ducks, geese and swans in North America;
43 nest in North America
Major Waterfowl Breeding Areas
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Major Waterfowl Wintering Areas
Waterfowl Migration Routes
Frank C. Bellrose
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Outline – Wood Ducks
• History• Biology• Ecology• Management• Challenges
WOOD DUCKAix sponsa
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Mandarin Duck
Range
Population Status and History• Early 1900’s – extremely low, extinction feared. Hunting
seasons 8 months, no bag limits• 1918 Migratory Bird Treaty Act – US & Canada. Hunting
season remained closed for wood ducks until 1941. Later, feds set more moderate seasons.
• Heavy clearing of hardwood bottoms, wetland drainage and channelization contributed to population declines
• By 1960’s woodies had recovered to the point of being #2 or 3 in the hunters bag.
• Population status – about 1.7 million – 1966• 1980s – 5.6 million nation-wide
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Wood Duck features
• A medium sized duck between a teal and a mallard
• Weight – about 1.5 lbs• Length – about 20 inches• Wings - broad, tail squared• Head - blocky with a crest, male and
female• Eyes – males red, females brown
Wood duck features
• Flight – 32 mph. Often erratic, bobbing, twisting and turning often through forests
• Perching – commonly in trees, especially during breeding season
Perching
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Habitat
• Riverine, streams and creeks• Beaver swamps• Wooded wetlands• Ponds and lakes with wooded shorelines,
aquatic vegetation, woody debris, sandbars& mudflats
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Food Habits• Ducklings – invertebrates- - aquatic and
terrestrial, then shifting to veg.
Food habits - AdultsDiverse & seasonal. Invertebrates, aquatic veg., leafy & tubers, acorns & other mast in fall, increasingly invertebrates in late winter in prep for nesting.
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Mating/Nesting• Pair bonding – fall• Mating – Feb-March• Nest sites – hollow trees/nest boxes• Clutch – mean = 13. Range – 6 to 40 (dump-
nesting). Lay 1/day• Incubation – after a complete clutch – 28-37
days to hatching.• Nest success about 50%• Renesting, after failure – once or twice• Double brooding is common
Pair bonding - fall
Mating – Feb.-March
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Nesting
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Clutch – 12-40 16+ = dump-nesting
Incubation – 28-37 days
Nest predators
• Raccoons• Opossums• Snakes• Squirrels• woodpeckers• Wind
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Nest Predators
Duckling predators
• Mammalian – mink, bobcats, rats, • Birds – herons, hawks and owls• Fish – bass, trout, muskey, other• Herps – bullfrogs, snapping turtles,
snakes, alligators• Survival to flight – 25-60%• Brooding cover• Roosting cover
Duckling Predators
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Brood Habitat
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Bachelor groups – brood-rearing season
Molt – male eclipse plumage
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Homerange
• Adults, flexible with food and cover resources.• Broods – 2 – 75 acres depending on habitat
quality
Autumn Activity
• Formation of autumn flock• Autumn roosts• Pre-migration radial dispersal• Fall migration• Wintering
Migration & Homing
• September-Dec.• South• Return – Feb – March• Homing – especially females return to site
where hatched• About 49% adult females and 23 immature
females return – variable to nest site
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Migration from east Tennessee(Minser 1968)
Waterfowl Inventories, prairie pothole region
Wood Duck Inventory Techniques
• Roosting flight counts• Brood surveys – daytime river float counts;
nightlighting brood counts on rivers• Hunter harvests – band returns, bag
checks• Helicopter surveys, aerial transect -
ineffective
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Population Threats• Habitat loss• Wetland drainage in hardwood bottomlands – (stream
channelization)- state & federal land use programs.• Setbacks to the Clean Water Act Sect. 404 permitting
processGeographically isolated wetlands no longer protected“Clean” dredging of wetlands now allowed
• Harvest regulation challenges• Riparian habitat degradation – development - loss of
nesting & brooding habitat • Improperly designed greentree reservoirs
Other Needs
• Population monitoring• Habitat management & protection• Harvest regulations
The problem of harvest distribution
Bright spots
• Curtailment of channelization• Wetland acquisition• Farm Bill, Wetland Restoration Program
(WRP). Microtopography provision• Fine-tuning nesting box programs• Fine tuning greentree reservoir
management
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Management Questions
Habitat1. What federal and state agencies have the greatest
possibilities for impacting wood duck habitat?2.What are the most serious negative impacts? 3. How might positive changes be brought about?
Population statusWhat are the major factors effecting annual wood duck populations, nationally? How can those factors be addressed to maintain healthy wood duck populations?
Population monitoring