Deanna Dawson
Deanna is a emeritus with the Eastern Ecological Science Center located at Laurel, MD.
An experienced field ornithologist, her current research uses remote sensing techniques to sample the spatiotemporal distribution of birds, primarily during migration periods. She collaborates in research that analyzes data from weather surveillance radars to map the densities of nocturnal migrants at daytime stopover sites, and uses acoustic data to quantify and model the abundance of migrants aloft. She also works on methods to estimate animal densities from sounds recorded on microphone arrays, applying them to recordings of bird song made across the Patuxent Research Refuge during the nesting season.
Science and Products
Filter Total Items: 54
Atlantic Flyway review: Piedmont-Coastal Plain, Region IV, Fall 2001 Atlantic Flyway review: Piedmont-Coastal Plain, Region IV, Fall 2001
The Hollywood, Butler Island, and Wekiva Basin stations did not operate this year, but we welcome back Jekyll Island, GA, with its flagship species, Western Palm Warbler (835); and we are glad to have a report from Rock Springs Run State Reserve in Florida to replace the Wekiva Station. Except for a couple of good rains in August, the second half of the year was droughty in Maryland and...
Authors
Chandler S. Robbins
Atlantic Flyway review: Piedmont-Coastal Plain, Region IV, Fall 2001: Patuxent powerline right-of-way (390-0764) Atlantic Flyway review: Piedmont-Coastal Plain, Region IV, Fall 2001: Patuxent powerline right-of-way (390-0764)
After one of the quietest Septembers since this station opened in 1980, a record high number of birds was captured in October, making the seasonal total almost identical to that in fall 2000. Capture totals exceeded 100 on eight mornings between 9 and 24 Oct, and a new daily high was set on 14 Oct, when 203 birds, including 105 Myrtle Warblers, were banded. Capture totals for several...
Authors
Deanna K. Dawson
Effects of urbanization on the distribution of area-sensitive forest birds in Prince George's County, Maryland Effects of urbanization on the distribution of area-sensitive forest birds in Prince George's County, Maryland
Bird survey data from Prince George's County, Maryland, were used to evaluate the effects of urbanization on the distribution of forest bird species that are area sensitive. We developed models that predict the probability of occurrence for species during the nesting season as a function of forest area and degree of urbanization. All of the 21 bird species considered occurred in a higher
Authors
D.K. Dawson, C.S. Robbins, L.J. Darr
Atlantic Flyway review: Piedmont-Coastal Plain, Region IV, Fall 1999: Patuxent powerline right-of-way (390-0764) Atlantic Flyway review: Piedmont-Coastal Plain, Region IV, Fall 1999: Patuxent powerline right-of-way (390-0764)
Fall 1999 was among the poorest seasons in this banding station's 20 years of operation. Record high capture totals were set for only two species: Ruby-throated Hummingbird (41 individuals captured, none banded; previous high 21) and White-breasted Nuthatch (two individuals banded; previous high, one). The only other species that stood out as being unusually numerous was Blackpoll...
Authors
Deanna K. Dawson
Impacts of cowbird parasitism on wood thrushes and other neotropical migrants in suburban Maryland forests Impacts of cowbird parasitism on wood thrushes and other neotropical migrants in suburban Maryland forests
During 1988-1993, we monitored nests of neotropical migrant birds in seven suburban Maryland forests to compare parasitism and predation rates in forests of different areas. Of 1,122 nests monitored, 672 were of Wood Thrush, the most commonly found nesting species. Study sites were forests that ranged in size from 21 ha to more than 1,300 ha in the Piedmont and Coastal Plain regions of...
Authors
B.A. Dowell, J.E. Fallon, C.S. Robbins, D.K. Dawson, F.W. Fallon
Coexistence and community structure of tropical trees in a Hawaiian montane rain forest Coexistence and community structure of tropical trees in a Hawaiian montane rain forest
We measured the diameter at breast height of all trees and shrubs > 5 meters in height, including standing dead trees, on 68 0.04-hectare study plots in a montane, subtropical rain forest on Mauna Loa, Hawai`i. The canopy species consisted of 88 percent Metrosideros polymorpha (ohia) and 12 percent Acacia koa (koa). Negative associations were found between the densities of koa and ohia...
Authors
Jeff S. Hatfield, William A. Link, Deanna K. Dawson, E. L. Lindquist
Changing land use: Problems and opportunities Changing land use: Problems and opportunities
Under the pressure of increasing human populations and expanding demands for food and fiber, native tropical and temperate habitats are becoming more restricted, and populations of many resident and migratory birds are declining. Mist net surveys of 111 forest and agricultural sites in Mexico, Belize, and Guatemala show that some migratory species use a wide variety of habitats during...
Authors
C.S. Robbins, D.K. Dawson, B.A. Dowell
Point count length and detection of forest neotropical migrant birds Point count length and detection of forest neotropical migrant birds
Comparisons of bird abundances among years or among habitats assume that the rates at which birds are detected and counted are constant within species. We use point count data collected in forests of the Mid-Atlantic states to estimate detection probabilities for Neotropical migrant bird species as a function of count length. For some species, significant differences existed among years...
Authors
D.K. Dawson, D. R. Smith, C.S. Robbins
Estimating bird species richness from capture and count data Estimating bird species richness from capture and count data
We used capture-recapture methods to estimate bird species richness from mist-net and point-count data from a study area in Campeche, Mexico. We estimated species richness separately for each survey technique for two habitats, forest and pasture, in six sampling periods. We then estimated richness based on species' detections by either technique, and estimated the proportion of species...
Authors
D.K. Dawson, J.R. Sauer, P.A. Wood, M. Berlanga, M.H. Wilson, C.S. Robbins
Point count length and detection of forest neotropical migrant birds Point count length and detection of forest neotropical migrant birds
No abstract available at this time
Authors
D.K. Dawson, D. R. Smith, C.S. Robbins
Habitat constraints on the distribution of passerine residents and neotropical migrants in Latin America Habitat constraints on the distribution of passerine residents and neotropical migrants in Latin America
With continuing tropical deforestation, there is increased concern for birds that depend on forest habitats in Latin America. During the past 10 northern winters, we have conducted quantitative studies of habitat use by wintering migrant songbirds and by residents in the Greater Antilles, Mexico, Central America, and northern South America. Many migrants, but few residents, winter in...
Authors
C.S. Robbins, B.A. Dowell, D.K. Dawson
Predicting the distribution of breeding forest birds in a fragmented landscape Predicting the distribution of breeding forest birds in a fragmented landscape
No abstract available.
Authors
D.K. Dawson, L.J. Darr, C.S. Robbins
Science and Products
Filter Total Items: 54
Atlantic Flyway review: Piedmont-Coastal Plain, Region IV, Fall 2001 Atlantic Flyway review: Piedmont-Coastal Plain, Region IV, Fall 2001
The Hollywood, Butler Island, and Wekiva Basin stations did not operate this year, but we welcome back Jekyll Island, GA, with its flagship species, Western Palm Warbler (835); and we are glad to have a report from Rock Springs Run State Reserve in Florida to replace the Wekiva Station. Except for a couple of good rains in August, the second half of the year was droughty in Maryland and...
Authors
Chandler S. Robbins
Atlantic Flyway review: Piedmont-Coastal Plain, Region IV, Fall 2001: Patuxent powerline right-of-way (390-0764) Atlantic Flyway review: Piedmont-Coastal Plain, Region IV, Fall 2001: Patuxent powerline right-of-way (390-0764)
After one of the quietest Septembers since this station opened in 1980, a record high number of birds was captured in October, making the seasonal total almost identical to that in fall 2000. Capture totals exceeded 100 on eight mornings between 9 and 24 Oct, and a new daily high was set on 14 Oct, when 203 birds, including 105 Myrtle Warblers, were banded. Capture totals for several...
Authors
Deanna K. Dawson
Effects of urbanization on the distribution of area-sensitive forest birds in Prince George's County, Maryland Effects of urbanization on the distribution of area-sensitive forest birds in Prince George's County, Maryland
Bird survey data from Prince George's County, Maryland, were used to evaluate the effects of urbanization on the distribution of forest bird species that are area sensitive. We developed models that predict the probability of occurrence for species during the nesting season as a function of forest area and degree of urbanization. All of the 21 bird species considered occurred in a higher
Authors
D.K. Dawson, C.S. Robbins, L.J. Darr
Atlantic Flyway review: Piedmont-Coastal Plain, Region IV, Fall 1999: Patuxent powerline right-of-way (390-0764) Atlantic Flyway review: Piedmont-Coastal Plain, Region IV, Fall 1999: Patuxent powerline right-of-way (390-0764)
Fall 1999 was among the poorest seasons in this banding station's 20 years of operation. Record high capture totals were set for only two species: Ruby-throated Hummingbird (41 individuals captured, none banded; previous high 21) and White-breasted Nuthatch (two individuals banded; previous high, one). The only other species that stood out as being unusually numerous was Blackpoll...
Authors
Deanna K. Dawson
Impacts of cowbird parasitism on wood thrushes and other neotropical migrants in suburban Maryland forests Impacts of cowbird parasitism on wood thrushes and other neotropical migrants in suburban Maryland forests
During 1988-1993, we monitored nests of neotropical migrant birds in seven suburban Maryland forests to compare parasitism and predation rates in forests of different areas. Of 1,122 nests monitored, 672 were of Wood Thrush, the most commonly found nesting species. Study sites were forests that ranged in size from 21 ha to more than 1,300 ha in the Piedmont and Coastal Plain regions of...
Authors
B.A. Dowell, J.E. Fallon, C.S. Robbins, D.K. Dawson, F.W. Fallon
Coexistence and community structure of tropical trees in a Hawaiian montane rain forest Coexistence and community structure of tropical trees in a Hawaiian montane rain forest
We measured the diameter at breast height of all trees and shrubs > 5 meters in height, including standing dead trees, on 68 0.04-hectare study plots in a montane, subtropical rain forest on Mauna Loa, Hawai`i. The canopy species consisted of 88 percent Metrosideros polymorpha (ohia) and 12 percent Acacia koa (koa). Negative associations were found between the densities of koa and ohia...
Authors
Jeff S. Hatfield, William A. Link, Deanna K. Dawson, E. L. Lindquist
Changing land use: Problems and opportunities Changing land use: Problems and opportunities
Under the pressure of increasing human populations and expanding demands for food and fiber, native tropical and temperate habitats are becoming more restricted, and populations of many resident and migratory birds are declining. Mist net surveys of 111 forest and agricultural sites in Mexico, Belize, and Guatemala show that some migratory species use a wide variety of habitats during...
Authors
C.S. Robbins, D.K. Dawson, B.A. Dowell
Point count length and detection of forest neotropical migrant birds Point count length and detection of forest neotropical migrant birds
Comparisons of bird abundances among years or among habitats assume that the rates at which birds are detected and counted are constant within species. We use point count data collected in forests of the Mid-Atlantic states to estimate detection probabilities for Neotropical migrant bird species as a function of count length. For some species, significant differences existed among years...
Authors
D.K. Dawson, D. R. Smith, C.S. Robbins
Estimating bird species richness from capture and count data Estimating bird species richness from capture and count data
We used capture-recapture methods to estimate bird species richness from mist-net and point-count data from a study area in Campeche, Mexico. We estimated species richness separately for each survey technique for two habitats, forest and pasture, in six sampling periods. We then estimated richness based on species' detections by either technique, and estimated the proportion of species...
Authors
D.K. Dawson, J.R. Sauer, P.A. Wood, M. Berlanga, M.H. Wilson, C.S. Robbins
Point count length and detection of forest neotropical migrant birds Point count length and detection of forest neotropical migrant birds
No abstract available at this time
Authors
D.K. Dawson, D. R. Smith, C.S. Robbins
Habitat constraints on the distribution of passerine residents and neotropical migrants in Latin America Habitat constraints on the distribution of passerine residents and neotropical migrants in Latin America
With continuing tropical deforestation, there is increased concern for birds that depend on forest habitats in Latin America. During the past 10 northern winters, we have conducted quantitative studies of habitat use by wintering migrant songbirds and by residents in the Greater Antilles, Mexico, Central America, and northern South America. Many migrants, but few residents, winter in...
Authors
C.S. Robbins, B.A. Dowell, D.K. Dawson
Predicting the distribution of breeding forest birds in a fragmented landscape Predicting the distribution of breeding forest birds in a fragmented landscape
No abstract available.
Authors
D.K. Dawson, L.J. Darr, C.S. Robbins