Sam Droege
Sam is a Wildlife Biologist at the Eastern Ecological Science Center in Laurel, MD.
Sam has coordinated the North American Breeding Bird Survey Program, developed the North American Amphibian Monitoring Program, the BioBlitz, Cricket Crawl, and FrogwatchUSA programs and worked on the design and evaluation of monitoring programs. Currently he is developing an inventory and monitoring program for native bees, online identification guides for North American bees at discoverlife.org, and reviving the North American Bird Phenology Program.
Education and Certifications
M.S. from State University of New York – Syracuse
B.S. from University of Maryland
Science and Products
Filter Total Items: 72
Mourning dove population trend estimates from Call-Count and North American Breeding Bird Surveys Mourning dove population trend estimates from Call-Count and North American Breeding Bird Surveys
The mourning dove (Zenaida macroura) Call-count Survey and the North American Breeding Bird Survey provide information on population trends of mourning doves throughout the continental United States. Because surveys are an integral part of the development of hunting regulations, a need exists to determine which survey provides precise information. We estimated population trends from 1966...
Authors
John R. Sauer, David D. Dolton, Sam Droege
Distribution and abundance of birds wintering in Maryland, 1988-1993 Distribution and abundance of birds wintering in Maryland, 1988-1993
A winter bird survey was conducted throughout Maryland, primarily by volunteers, during the 6 winters of 1988 to 1993 between the dates of 10 Jan and 10 Feb. The state of Maryland is covered by 1231 blocks (9.5 sq. miles each), each comprising one-sixth of the standard U.S.G.S. 7.5 minute topographic quadrangle, and 548 of these blocks (44.5%) were surveyed for winter birds. Blocks were...
Authors
Jeff S. Hatfield, S.A. Ricciardi, G.A. Gough, D. Bystrak, Sam Droege, C.S. Robbins
Are more North American species decreasing than increasing? Are more North American species decreasing than increasing?
Population trends for North American species are calculated for 1966-'91 and 1982-'91 using Nonh American Breeding Bird Survey data. Species are grouped into 3 systems of guild classifications representing migration status, breeding habitat and nesting substrate. Trends for these groups are summarized by time period, bioregion and physiographic region. At the continental level, declines
Authors
Sam Droege, J.R. Sauer
Population trends of quails in North America Population trends of quails in North America
We used North American Breeding Bird Survey data (1966-91) to estimate distribution, relative abundance, and populatiori trends of quails. Population trends in grassland/shrub birds sympatric with northern bobwhite (Colinus virginianus) were also examined. Northern bobwhite and scaled quail (Callipepla squamata) populations have declined since 1966. Rates of decline for these quails have
Authors
K.E. Church, J.R. Sauer, Sam Droege
Monitoring neotropical migrants on managed land: When, where, why Monitoring neotropical migrants on managed land: When, where, why
Relevant wildlife monitoring on managed lands lies somewhere between monitoring everything and monitoring nothing. Knowing the population status of all birds on a managed area would be potentially useful information but would be costly to collect, but without monitoring no link between management and wildlife populations can be made. A decision making process for developing appropriate...
Authors
Sam Droege
Geographic patterns in population trends of neotropical migrants in North America Geographic patterns in population trends of neotropical migrants in North America
We use the route-regression method to estimate the population trends of 100 species of Neotropical migrants using data from the North American Breeding Bird Survey (BBS). We examine long-term (1966-1988) and recent (1978-1988) trends. In the long-term, more species of Neotropical migrants were increasing than were decreasing in the eastern and western parts of the continent, but recent...
Authors
J.R. Sauer, Sam Droege
Breeding Bird Survey and bird banding data: Applications to raptor research and management Breeding Bird Survey and bird banding data: Applications to raptor research and management
The Breeding Bird Survey (BBS) and Bird Banding Laboratory (BBL) are sources of information for raptor biologists. The BBS has been conducted each year since 1966 in the United States and Canada; historical bird banding records extend back to the early 20th century. BBS data can be used to document population trends and breeding distributions of many bird species. Banding data are...
Authors
J.R. Sauer, Sam Droege, D. Bystrak
Survey Designs and Statistical Methods for the Estimation of Avian Population Trends Survey Designs and Statistical Methods for the Estimation of Avian Population Trends
No abstract available.
Authors
J.R. Sauer, Sam Droege
Recent population trends of the eastern bluebird Recent population trends of the eastern bluebird
North American Breeding Bird Survey data for the period 1966-1987 indicate that Eastern Bluebird (Sialia sialis) populations declined during the 1970s, primarily in association with either severe winters or severe spring storms. In recent years, bluebird populations have increased to levels similar to those observed during the first year (1966) of the survey. Survey results suggest that...
Authors
J.R. Sauer, Sam Droege
Adaptations to tidal marshes in breeding populations of the swamp sparrow Adaptations to tidal marshes in breeding populations of the swamp sparrow
The Coastal Plain Swamp Sparrow (Melospiza georgiana nigrescens) was originally described from a small number of specimens from the tidal marshes of the Nanticoke River in southeastern Maryland. Based on our quantitative analysis of a larger series of specimens, we found that Swamp Sparrows collected during the breeding season from the Chesapeak and Delaware bays (and tributaries) and...
Authors
R. Greenberg, Sam Droege
Wood duck population trends from the North American Breeding Bird Survey Wood duck population trends from the North American Breeding Bird Survey
The North American Breeding Bird Survey (BBS) has been conducted yearly since 1966, and can be used to describe relative population density and trends of birds in North America north of Mexico. Wood ducks (Air sponsa) are difficult to survey using conventional waterfowl monitoring techniques, but a large portion of their range is surveyed by the BBS. Wood ducks are detected at low...
Authors
J.R. Sauer, Sam Droege
Estimation of annual indices from roadside surveys Estimation of annual indices from roadside surveys
Most of the surveys presently used to estimate population trends on a large geographic scale depend upon repeated visits to a number of randomly selected routes or monitoring points. As these surveys cannot be analyzed by modeling annual mean densities among routes within a region, no natural annual index of population density exists for the region. We discuss two possible methodologies...
Authors
J.R. Sauer, P.H. Geissler
Science and Products
Filter Total Items: 72
Mourning dove population trend estimates from Call-Count and North American Breeding Bird Surveys Mourning dove population trend estimates from Call-Count and North American Breeding Bird Surveys
The mourning dove (Zenaida macroura) Call-count Survey and the North American Breeding Bird Survey provide information on population trends of mourning doves throughout the continental United States. Because surveys are an integral part of the development of hunting regulations, a need exists to determine which survey provides precise information. We estimated population trends from 1966...
Authors
John R. Sauer, David D. Dolton, Sam Droege
Distribution and abundance of birds wintering in Maryland, 1988-1993 Distribution and abundance of birds wintering in Maryland, 1988-1993
A winter bird survey was conducted throughout Maryland, primarily by volunteers, during the 6 winters of 1988 to 1993 between the dates of 10 Jan and 10 Feb. The state of Maryland is covered by 1231 blocks (9.5 sq. miles each), each comprising one-sixth of the standard U.S.G.S. 7.5 minute topographic quadrangle, and 548 of these blocks (44.5%) were surveyed for winter birds. Blocks were...
Authors
Jeff S. Hatfield, S.A. Ricciardi, G.A. Gough, D. Bystrak, Sam Droege, C.S. Robbins
Are more North American species decreasing than increasing? Are more North American species decreasing than increasing?
Population trends for North American species are calculated for 1966-'91 and 1982-'91 using Nonh American Breeding Bird Survey data. Species are grouped into 3 systems of guild classifications representing migration status, breeding habitat and nesting substrate. Trends for these groups are summarized by time period, bioregion and physiographic region. At the continental level, declines
Authors
Sam Droege, J.R. Sauer
Population trends of quails in North America Population trends of quails in North America
We used North American Breeding Bird Survey data (1966-91) to estimate distribution, relative abundance, and populatiori trends of quails. Population trends in grassland/shrub birds sympatric with northern bobwhite (Colinus virginianus) were also examined. Northern bobwhite and scaled quail (Callipepla squamata) populations have declined since 1966. Rates of decline for these quails have
Authors
K.E. Church, J.R. Sauer, Sam Droege
Monitoring neotropical migrants on managed land: When, where, why Monitoring neotropical migrants on managed land: When, where, why
Relevant wildlife monitoring on managed lands lies somewhere between monitoring everything and monitoring nothing. Knowing the population status of all birds on a managed area would be potentially useful information but would be costly to collect, but without monitoring no link between management and wildlife populations can be made. A decision making process for developing appropriate...
Authors
Sam Droege
Geographic patterns in population trends of neotropical migrants in North America Geographic patterns in population trends of neotropical migrants in North America
We use the route-regression method to estimate the population trends of 100 species of Neotropical migrants using data from the North American Breeding Bird Survey (BBS). We examine long-term (1966-1988) and recent (1978-1988) trends. In the long-term, more species of Neotropical migrants were increasing than were decreasing in the eastern and western parts of the continent, but recent...
Authors
J.R. Sauer, Sam Droege
Breeding Bird Survey and bird banding data: Applications to raptor research and management Breeding Bird Survey and bird banding data: Applications to raptor research and management
The Breeding Bird Survey (BBS) and Bird Banding Laboratory (BBL) are sources of information for raptor biologists. The BBS has been conducted each year since 1966 in the United States and Canada; historical bird banding records extend back to the early 20th century. BBS data can be used to document population trends and breeding distributions of many bird species. Banding data are...
Authors
J.R. Sauer, Sam Droege, D. Bystrak
Survey Designs and Statistical Methods for the Estimation of Avian Population Trends Survey Designs and Statistical Methods for the Estimation of Avian Population Trends
No abstract available.
Authors
J.R. Sauer, Sam Droege
Recent population trends of the eastern bluebird Recent population trends of the eastern bluebird
North American Breeding Bird Survey data for the period 1966-1987 indicate that Eastern Bluebird (Sialia sialis) populations declined during the 1970s, primarily in association with either severe winters or severe spring storms. In recent years, bluebird populations have increased to levels similar to those observed during the first year (1966) of the survey. Survey results suggest that...
Authors
J.R. Sauer, Sam Droege
Adaptations to tidal marshes in breeding populations of the swamp sparrow Adaptations to tidal marshes in breeding populations of the swamp sparrow
The Coastal Plain Swamp Sparrow (Melospiza georgiana nigrescens) was originally described from a small number of specimens from the tidal marshes of the Nanticoke River in southeastern Maryland. Based on our quantitative analysis of a larger series of specimens, we found that Swamp Sparrows collected during the breeding season from the Chesapeak and Delaware bays (and tributaries) and...
Authors
R. Greenberg, Sam Droege
Wood duck population trends from the North American Breeding Bird Survey Wood duck population trends from the North American Breeding Bird Survey
The North American Breeding Bird Survey (BBS) has been conducted yearly since 1966, and can be used to describe relative population density and trends of birds in North America north of Mexico. Wood ducks (Air sponsa) are difficult to survey using conventional waterfowl monitoring techniques, but a large portion of their range is surveyed by the BBS. Wood ducks are detected at low...
Authors
J.R. Sauer, Sam Droege
Estimation of annual indices from roadside surveys Estimation of annual indices from roadside surveys
Most of the surveys presently used to estimate population trends on a large geographic scale depend upon repeated visits to a number of randomly selected routes or monitoring points. As these surveys cannot be analyzed by modeling annual mean densities among routes within a region, no natural annual index of population density exists for the region. We discuss two possible methodologies...
Authors
J.R. Sauer, P.H. Geissler