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
Filter Total Items: 93
Spring bird migration in Mississippi Alluvial Valley forests
We surveyed forest songbirds during migration in bottomland hardwood forest stands and managed cottonwood (Populus deltoides) plantations in northeast Louisiana and west-central Mississippi between 24 March and 24 May 1996 and 1997. We detected more bird species in bottomland hardwood stands than in cottonwood stands. Within hardwood stands, we detected more individuals in stands subjected to unev
Authors
R. Randy Wilson, Daniel J. Twedt
Synergy of agroforestry and bottomland hardwood afforestation
Afforestation of bottomland hardwood forests has historically emphasized planting heavy-seeded tree species such as oak (Quercus spp.) and pecan (Caryaillinoensis) with little or no silvicultural management during stand development. Slow growth of these tree species, herbivory, competing vegetation, and limited seed dispersal, often result in restored sites that are slow to develop vertical veget
Authors
D.J. Twedt, J. Portwood
Development of oak plantations established for wildlife
Extensive areas that are currently in agricultural production within the Mississippi Alluvial Valley are being restored to bottomland hardwood forests. Oaks (Quercus sp.), sown as seeds (acorns) or planted as seedlings, are the predominant trees established on most afforested sites. To compare stand development and natural invasion on sites afforested by planting seedlings or by sowing acorns, w
Authors
D.J. Twedt, R.R. Wilson
Avian response to bottomland hardwood reforestation: The first 10 years
Bottomland hardwood forests were planted on agricultural fields in Mississippi and Louisiana predominantly using either Quercus species (oaks) or Populus deltoides (eastern cottonwood). We assessed avian colonization of these reforested sites between 2 and 10 years after planting. Rapid vertical growth of cottonwoods (circa 2–3 m/year) resulted in sites with forest structure that supported greater
Authors
Daniel J. Twedt, R. Randy Wilson, J. L. Henne-Kerr, David Grosshuesch
Supplemental planting of early successional tree species during bottomland hardwood afforestation
Reforestation of former bottom land hardwood forests that have been cleared for agriculture (i.e., afforestation) has historically emphasized planting heavy-seeded oaks (Quercus spp.) and pecans (Carya spp.). These species are slow to develop vertical forest structure. However, vertical forest structure is key to colonization of afforested sites by forest birds. Although early-successional tree
Authors
D.J. Twedt, R.R. Wilson
Morphometric changes in Yellow-headed Blackbirds during summer in central North Dakota
Temporal stability of morphometric measurements is desirable when using avian morphology as a predictor of geographic origin. Therefore, to assess their temporal stability, we examined changes in morphology of Yellow-headed Blackbirds (Xanthocephalus xanthocephalus) from central North Dakota during summer. Measurements differed among age classes and between sexes. As expected, due to growth and ma
Authors
D.J. Twedt, G.M. Linz
Forest restoration as ecological succession: should we speed it up or slow it down?
Recent assessments of afforestation of agricultural lands in the Mississippi Alluvial Valley imply the importance of quickly developing vertical forest structure to benefit 'wildlife.' We examine this assumption and find that animal species of interest as targets of proactive management, as well as targets of control, occur through the full successional sere. Different species of mammals and bir
Authors
P.B. Hamel, D.J. Twedt, T.J. Nuttle, C.A. Woodson, F. Broerman, J.M. Wahome
Nest survival of forest birds in the Mississippi Alluvial Valley
In the Mississippi Alluvial Valley, flood control has led to a drastic reduction in the area of forest habitat and altered the patchwork of forest cover types. Silvicultural management of the remaining fragmented forests has changed to reflect the altered hydrology of the forests, current economic conditions of the area, and demand for forest products. Because forest type and silvicultural managem
Authors
D.J. Twedt, R.R. Wilson, J. L. Henne-Kerr, R.B. Hamilton
Inability to predict geographic origin of Yellow-headed Blackbirds, Xanthocephalus xanthocephalus, during migration
Yellow-headed Blackbirds (Xanthocephalus xanthocephalus) collected at different breeding locations in Alberta, Saskatchewan, Manitoba, and North Dakota exhibit clearly discernable morphometric differences with larger bodied birds found at more northern and western locations. We reduced eight skeletal measurements and body length from adult female and male Yellow-headed Blackbirds to their first t
Authors
D.J. Twedt, G.M. Linz, W.J. Bleier
Artificial cavities enhance breeding bird densities in managed cottonwood forests
The paucity of natural cavities within short-rotation hardwood agroforests restricts occupancy by cavity-nesting birds. However, providing 1.6 artificial nesting cavities (nest boxes)/ha within 3- to 10-year-old managed cottonwood forests in the Mississippi Alluvial Valley increased territory density of cavity-nesting birds. Differences in territory densities between forests with and without nest
Authors
D.J. Twedt, J. L. Henne-Kerr
Development of management objectives for waterfowl and shorebirds within the Mississippi Alluvial Valley
The goal of the Lower Mississippi Valley Joint Venture of the North American Waterfowl Management Plan is to provide sufficient habitat to support 4.3 million wintering ducks and 1.0 million wintering geese annually. Under the assumption that the amount of foraging habitat is the primary limitation to supporting waterfowl population goals in the Mississippi Alluvial Valley (MAV), a habitat object
Authors
C.R. Loesch, D.J. Twedt, K. Tripp, W.C. Hunter, M.S. Woodrey
Comparison of line transects and point counts for monitoring spring migration in forested wetlands
We compared the efficacy of 400-m line transects and sets of three point counts at detecting avian richness and abundance in bottomland hardwood forests and intensively managed cottonwood (Populus deltoides) plantations within the Mississippi Alluvial Valley. We detected more species and more individuals on line transects than on three point counts during 218 paired surveys conducted between 24 M
Authors
R.R. Wilson, D.J. Twedt, A.B. Elliott
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Filter Total Items: 93
Spring bird migration in Mississippi Alluvial Valley forests
We surveyed forest songbirds during migration in bottomland hardwood forest stands and managed cottonwood (Populus deltoides) plantations in northeast Louisiana and west-central Mississippi between 24 March and 24 May 1996 and 1997. We detected more bird species in bottomland hardwood stands than in cottonwood stands. Within hardwood stands, we detected more individuals in stands subjected to unevAuthorsR. Randy Wilson, Daniel J. TwedtSynergy of agroforestry and bottomland hardwood afforestation
Afforestation of bottomland hardwood forests has historically emphasized planting heavy-seeded tree species such as oak (Quercus spp.) and pecan (Caryaillinoensis) with little or no silvicultural management during stand development. Slow growth of these tree species, herbivory, competing vegetation, and limited seed dispersal, often result in restored sites that are slow to develop vertical vegetAuthorsD.J. Twedt, J. PortwoodDevelopment of oak plantations established for wildlife
Extensive areas that are currently in agricultural production within the Mississippi Alluvial Valley are being restored to bottomland hardwood forests. Oaks (Quercus sp.), sown as seeds (acorns) or planted as seedlings, are the predominant trees established on most afforested sites. To compare stand development and natural invasion on sites afforested by planting seedlings or by sowing acorns, wAuthorsD.J. Twedt, R.R. WilsonAvian response to bottomland hardwood reforestation: The first 10 years
Bottomland hardwood forests were planted on agricultural fields in Mississippi and Louisiana predominantly using either Quercus species (oaks) or Populus deltoides (eastern cottonwood). We assessed avian colonization of these reforested sites between 2 and 10 years after planting. Rapid vertical growth of cottonwoods (circa 2–3 m/year) resulted in sites with forest structure that supported greaterAuthorsDaniel J. Twedt, R. Randy Wilson, J. L. Henne-Kerr, David GrosshueschSupplemental planting of early successional tree species during bottomland hardwood afforestation
Reforestation of former bottom land hardwood forests that have been cleared for agriculture (i.e., afforestation) has historically emphasized planting heavy-seeded oaks (Quercus spp.) and pecans (Carya spp.). These species are slow to develop vertical forest structure. However, vertical forest structure is key to colonization of afforested sites by forest birds. Although early-successional treeAuthorsD.J. Twedt, R.R. WilsonMorphometric changes in Yellow-headed Blackbirds during summer in central North Dakota
Temporal stability of morphometric measurements is desirable when using avian morphology as a predictor of geographic origin. Therefore, to assess their temporal stability, we examined changes in morphology of Yellow-headed Blackbirds (Xanthocephalus xanthocephalus) from central North Dakota during summer. Measurements differed among age classes and between sexes. As expected, due to growth and maAuthorsD.J. Twedt, G.M. LinzForest restoration as ecological succession: should we speed it up or slow it down?
Recent assessments of afforestation of agricultural lands in the Mississippi Alluvial Valley imply the importance of quickly developing vertical forest structure to benefit 'wildlife.' We examine this assumption and find that animal species of interest as targets of proactive management, as well as targets of control, occur through the full successional sere. Different species of mammals and birAuthorsP.B. Hamel, D.J. Twedt, T.J. Nuttle, C.A. Woodson, F. Broerman, J.M. WahomeNest survival of forest birds in the Mississippi Alluvial Valley
In the Mississippi Alluvial Valley, flood control has led to a drastic reduction in the area of forest habitat and altered the patchwork of forest cover types. Silvicultural management of the remaining fragmented forests has changed to reflect the altered hydrology of the forests, current economic conditions of the area, and demand for forest products. Because forest type and silvicultural managemAuthorsD.J. Twedt, R.R. Wilson, J. L. Henne-Kerr, R.B. HamiltonInability to predict geographic origin of Yellow-headed Blackbirds, Xanthocephalus xanthocephalus, during migration
Yellow-headed Blackbirds (Xanthocephalus xanthocephalus) collected at different breeding locations in Alberta, Saskatchewan, Manitoba, and North Dakota exhibit clearly discernable morphometric differences with larger bodied birds found at more northern and western locations. We reduced eight skeletal measurements and body length from adult female and male Yellow-headed Blackbirds to their first tAuthorsD.J. Twedt, G.M. Linz, W.J. BleierArtificial cavities enhance breeding bird densities in managed cottonwood forests
The paucity of natural cavities within short-rotation hardwood agroforests restricts occupancy by cavity-nesting birds. However, providing 1.6 artificial nesting cavities (nest boxes)/ha within 3- to 10-year-old managed cottonwood forests in the Mississippi Alluvial Valley increased territory density of cavity-nesting birds. Differences in territory densities between forests with and without nestAuthorsD.J. Twedt, J. L. Henne-KerrDevelopment of management objectives for waterfowl and shorebirds within the Mississippi Alluvial Valley
The goal of the Lower Mississippi Valley Joint Venture of the North American Waterfowl Management Plan is to provide sufficient habitat to support 4.3 million wintering ducks and 1.0 million wintering geese annually. Under the assumption that the amount of foraging habitat is the primary limitation to supporting waterfowl population goals in the Mississippi Alluvial Valley (MAV), a habitat objectAuthorsC.R. Loesch, D.J. Twedt, K. Tripp, W.C. Hunter, M.S. WoodreyComparison of line transects and point counts for monitoring spring migration in forested wetlands
We compared the efficacy of 400-m line transects and sets of three point counts at detecting avian richness and abundance in bottomland hardwood forests and intensively managed cottonwood (Populus deltoides) plantations within the Mississippi Alluvial Valley. We detected more species and more individuals on line transects than on three point counts during 218 paired surveys conducted between 24 MAuthorsR.R. Wilson, D.J. Twedt, A.B. Elliott