Daniel Twedt, Ph.D.
Daniel J. Twedt received graduate degrees from Western Kentucky and North Dakota State University for his work on starling and yellow-headed blackbird ecology, respectively.
For the past 20+ years, Dr. Twedt has been a research wildlife biologist with the USGS Patuxent Wildlife Research Center, stationed in Vicksburg, MS and Memphis, TN. During this time, his research has focused on avian ecology within bottomland hardwood forests, including bird response to forest restoration and silvicultural management, and assessment of alternative restoration and management techniques. Ongoing projects address forest structure and bird response to silvicultural prescriptions targeting wildlife in bottomland hardwoods, survival and productivity of birds in bottomland forests, and landscape scale integration of national land cover and forest inventory databases for assessment of bird distribution and abundance.
Science and Products
Breeding bird census: Planted cottonwood forest -outside levee
A land manager's guide to point counts of birds in the Southeast
Seed deterioration in flooded agricultural fields during winter
Breeding bird census: Coppiced cottonwood forest I & II
Breeding bird census: Planted cottonwood forest -inside levee
Sample size and allocation of effort in point count sampling of birds in bottomland hardwood forests
Yellow-headed blackbird (Xanthocephalus xanthocephalus)
Conservation partnerships in the lower Mississippi Alluvial Valley
Age-class separation of blue-winged ducks
Warbling vireos breeding in Issaquena County, Mississippi
Geographic variation in Yellow-headed Blackbirds from the northern Great Plains
MAPS is for the birds
Science and Products
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Filter Total Items: 93
Breeding bird census: Planted cottonwood forest -outside levee
No abstract available.AuthorsDaniel J. TwedtA 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 monitoring surveyAuthorsP.B. Hamel, W.P. Smith, D.J. Twedt, J.R. Woehr, E. Morris, R.B. Hamilton, R.J. CooperSeed 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 (Paspalum boscianAuthorsC.O. Nelms, D.J. TwedtBreeding bird census: Coppiced cottonwood forest I & II
No abstract available.AuthorsDaniel J. TwedtBreeding bird census: Planted cottonwood forest -inside levee
No abstract available.AuthorsDaniel J. TwedtSample 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 number ofAuthorsW.P. Smith, D.J. Twedt, R.J. Cooper, D.A. Wiedenfeld, P.B. Hamel, R.P. FordYellow-headed blackbird (Xanthocephalus xanthocephalus)
No abstract available.AuthorsD.J. Twedt, R.D. CrawfordConservation partnerships in the lower Mississippi Alluvial Valley
No abstract available.AuthorsD.R. Loesch, D.J. Twedt, K. J. ReineckeAge-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 remigialAuthorsW.L. Hohman, J.L. Moore, D.J. Twedt, John G. Mensik, E. LogerwellWarbling vireos breeding in Issaquena County, Mississippi
No abstract available.AuthorsC.O. Nelms, D.J. Twedt, J. Henne-KerrGeographic 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. Males collecAuthorsDaniel J. Twedt, William J. Bleier, George M. LinzMAPS is for the birds
No abstract availableAuthorsDavid L. Watts, Daniel J. Twedt, Allan J. Mueller