Daniel Twedt, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 93
A land manager's guide to point counts of birds in the Southeast A land manager's guide to point counts of birds in the Southeast
Current widespread concern for the status of neotropical migratory birds has sparked interest in techniques for inventorying and monitoring populations of these and other birds in southeastern forest habitats. The present guide gives detailed instructions for conducting point counts of birds. It further presents a detailed methodology for the design and conduct of inventorial and...
Authors
P.B. Hamel, W.P. Smith, D.J. Twedt, J.R. Woehr, E. Morris, R.B. Hamilton, R.J. Cooper
Seed deterioration in flooded agricultural fields during winter Seed deterioration in flooded agricultural fields during winter
We determined rate of seed deterioration for 3 crops (corn, rice, and soybean) and 8 weeds commonly found in agricultural fields and moist-soil management units in the Mississippi Alluvial Valley (MAV). The weeds were broadleaf signalgrass (Brachiaria platyphylla), junglerice barnyardgrass (Echinochloa colonum), morningglory (Ipomoea sp.), panic grass (Panicum sp.), bull paspalum...
Authors
C.O. Nelms, D.J. Twedt
Breeding bird census: Coppiced cottonwood forest I & II Breeding bird census: Coppiced cottonwood forest I & II
No abstract available.
Authors
Daniel Twedt
Age-class separation of blue-winged ducks Age-class separation of blue-winged ducks
Accurate determination of age is of fundamental importance to population and life history studies of waterfowl and their management. Therefore, we developed quantitative methods that separate adult and immature blue-winged teal (Anas discors), cinnamon teal (A. cyanoptera), and northern shovelers (A. clypeata) during spring and summer. To assess suitability of discriminant models using 9...
Authors
William Hohman, Joseph Moore, Daniel Twedt, John Mensik, E. Logerwell
Sample size and allocation of effort in point count sampling of birds in bottomland hardwood forests Sample size and allocation of effort in point count sampling of birds in bottomland hardwood forests
To examine sample size requirements and optimum allocation of effort in point count sampling of bottomland hardwood forests, we computed minimum sample sizes from variation recorded during 82 point counts (May 7-May 16, 1992) from three localities containing three habitat types across three regions of the Mississippi Alluvial Valley (MAV). Also, we estimated the effect of increasing the...
Authors
W.P. Smith, D.J. Twedt, R.J. Cooper, D.A. Wiedenfeld, P.B. Hamel, R.P. Ford
Yellow-headed blackbird (Xanthocephalus xanthocephalus) Yellow-headed blackbird (Xanthocephalus xanthocephalus)
No abstract available.
Authors
D.J. Twedt, R.D. Crawford
Conservation partnerships in the lower Mississippi Alluvial Valley Conservation partnerships in the lower Mississippi Alluvial Valley
No abstract available.
Authors
D.R. Loesch, D.J. Twedt, K. Reinecke
Warbling vireos breeding in Issaquena County, Mississippi Warbling vireos breeding in Issaquena County, Mississippi
No abstract available.
Authors
C.O. Nelms, D.J. Twedt, J. Henne-Kerr
Geographic variation in Yellow-headed Blackbirds from the northern Great Plains Geographic variation in Yellow-headed Blackbirds from the northern Great Plains
We assessed geographic variability in morphology among Yellow-headed Blackbirds (Xanthocephalus xanthocephalus) collected from breeding populations in Minnesota, North Dakota, and South Dakota in the United States and Alberta, Manitoba, and Saskatchewan in Canada during spring. Both male and female Yellow-headed Blackbirds tended to be larger in the more northern breeding populations...
Authors
Daniel Twedt, William Bleier, George Linz
MAPS is for the birds MAPS is for the birds
No abstract available
Authors
David Watts, Daniel Twedt, Allan Mueller
Science and Products
Filter Total Items: 93
A land manager's guide to point counts of birds in the Southeast A land manager's guide to point counts of birds in the Southeast
Current widespread concern for the status of neotropical migratory birds has sparked interest in techniques for inventorying and monitoring populations of these and other birds in southeastern forest habitats. The present guide gives detailed instructions for conducting point counts of birds. It further presents a detailed methodology for the design and conduct of inventorial and...
Authors
P.B. Hamel, W.P. Smith, D.J. Twedt, J.R. Woehr, E. Morris, R.B. Hamilton, R.J. Cooper
Seed deterioration in flooded agricultural fields during winter Seed deterioration in flooded agricultural fields during winter
We determined rate of seed deterioration for 3 crops (corn, rice, and soybean) and 8 weeds commonly found in agricultural fields and moist-soil management units in the Mississippi Alluvial Valley (MAV). The weeds were broadleaf signalgrass (Brachiaria platyphylla), junglerice barnyardgrass (Echinochloa colonum), morningglory (Ipomoea sp.), panic grass (Panicum sp.), bull paspalum...
Authors
C.O. Nelms, D.J. Twedt
Breeding bird census: Coppiced cottonwood forest I & II Breeding bird census: Coppiced cottonwood forest I & II
No abstract available.
Authors
Daniel Twedt
Age-class separation of blue-winged ducks Age-class separation of blue-winged ducks
Accurate determination of age is of fundamental importance to population and life history studies of waterfowl and their management. Therefore, we developed quantitative methods that separate adult and immature blue-winged teal (Anas discors), cinnamon teal (A. cyanoptera), and northern shovelers (A. clypeata) during spring and summer. To assess suitability of discriminant models using 9...
Authors
William Hohman, Joseph Moore, Daniel Twedt, John Mensik, E. Logerwell
Sample size and allocation of effort in point count sampling of birds in bottomland hardwood forests Sample size and allocation of effort in point count sampling of birds in bottomland hardwood forests
To examine sample size requirements and optimum allocation of effort in point count sampling of bottomland hardwood forests, we computed minimum sample sizes from variation recorded during 82 point counts (May 7-May 16, 1992) from three localities containing three habitat types across three regions of the Mississippi Alluvial Valley (MAV). Also, we estimated the effect of increasing the...
Authors
W.P. Smith, D.J. Twedt, R.J. Cooper, D.A. Wiedenfeld, P.B. Hamel, R.P. Ford
Yellow-headed blackbird (Xanthocephalus xanthocephalus) Yellow-headed blackbird (Xanthocephalus xanthocephalus)
No abstract available.
Authors
D.J. Twedt, R.D. Crawford
Conservation partnerships in the lower Mississippi Alluvial Valley Conservation partnerships in the lower Mississippi Alluvial Valley
No abstract available.
Authors
D.R. Loesch, D.J. Twedt, K. Reinecke
Warbling vireos breeding in Issaquena County, Mississippi Warbling vireos breeding in Issaquena County, Mississippi
No abstract available.
Authors
C.O. Nelms, D.J. Twedt, J. Henne-Kerr
Geographic variation in Yellow-headed Blackbirds from the northern Great Plains Geographic variation in Yellow-headed Blackbirds from the northern Great Plains
We assessed geographic variability in morphology among Yellow-headed Blackbirds (Xanthocephalus xanthocephalus) collected from breeding populations in Minnesota, North Dakota, and South Dakota in the United States and Alberta, Manitoba, and Saskatchewan in Canada during spring. Both male and female Yellow-headed Blackbirds tended to be larger in the more northern breeding populations...
Authors
Daniel Twedt, William Bleier, George Linz
MAPS is for the birds MAPS is for the birds
No abstract available
Authors
David Watts, Daniel Twedt, Allan Mueller