Joseph Fleskes
Joseph P. Fleskes is a research wildlife biologist with the USGS Western Ecological Research Center, Dixon Field Station in Dixon, California.
He received his B.S. in Fisheries and Wildlife Biology (1980) and M.S. in Wildlife Biology (1986) at Iowa State University and his Ph.D. in Wildlife Science (1999) at Oregon State University. His research interests include ecology of migratory waterbirds (especially waterfowl) and their habitats with the goal of improving population and habitat management for these species. His recent research has focused primarily on northern pintails and other waterfowl, especially in the Central Valley and other Pacific Flyway regions.
PROFESSIONAL EXPERIENCE
- Dec 1994-present. Research Wildlife Biologist, U. S. Geological Survey, Western Ecological Research Center, Dixon Field Station, Dixon, CA. Principal investigator and multi-agency team leader of research program on a variety of issues related primarily to migratory bird ecology and wetland landscapes throughout North America and especially in the Pacific Flyway.
- Jan 1994-Dec 1994. Graduate Research Assistant, Oregon State University, Department of Fisheries and Wildlife, Corvallis, OR. Led research project on northern pintail ecology in the San Joaquin Valley.
- Jun 1993-Jan 1994. Wildlife Biologist, National Biological Service, California Science Center, Dixon Field Station, Dixon, CA. Led research project on northern pintail ecology in the San Joaquin Valley.
- Apr1993-Jun 1993. Graduate Research Assistant, Oregon State University, Department of Fisheries and Wildlife, Corvallis, OR. Led research project on northern pintail ecology in the San Joaquin Valley.
- Jun 1992-Apr 1993. Wildlife Biologist, U.S. Fish and Wildlife Service, Northern Prairie Wildlife Research Center, Pacific States Ecology Field Station, Dixon, CA. Led research project on northern pintail ecology in the San Joaquin Valley.
- July 1986-Jun 1992. General Biologist (Wildlife), U. S. Fish and Wildlife Service, Northern Prairie Wildlife Research Center, Pacific States Ecology Field Station, Dixon, CA. Project co-investigator on a variety of projects. Helped design, develop, accomplish, and coordinate three studies to determine survival, habitat use and movements of pintails and white-fronted geese during fall-spring in northern California and surrounding states. Served as the radio-telemetry coordinator, trapping and banding coordinator, aircraft operations coordinator, and field-crew member. Procured, inventoried and maintained equipment and trained field technicians. Enlisted and maintained cooperation of federal, state and private groups and individuals. Compiled and helped analyze data, and prepared reports. Also provided technical assistance on a variety of issues as requested, and analy
Science and Products
Assessing the Impacts of Drought on Migratory Waterbirds in Key Conservation Regions of the Western U.S.
Migratory birds may be hit especially hard by climate change – particularly waterbirds that depend on wetlands as resting and feeding sites during their journey between breeding and non-breeding grounds. California’s Central Valley and the interior basins of southeastern Oregon and northeastern California provide some of the most critical wetlands resources to migratory waterbirds in the western U
The Impact of Drought on Waterbirds and Their Wetland Habitats in California’s Central Valley
California’s Central Valley is a nexus for water resources in the state, draining the Sacramento and San Joaquin River watersheds. Urban centers, agricultural operations, and the environment all compete for limited water, and demand is expected to only increase as the population grows and agriculture intensifies. At the same time, the water supply is projected to decrease as temperatures rise, pre
Recent historical and projected (years 2006-99) areas (km2) of managed, flooded habitats used by waterbirds overwintering in Central Valley, California basins for 17 climate, urbanization, and water management scenarios
Matchett and Fleskes (2018) evaluated availability of wetland and agricultural habitats used by waterbirds overwintering in the Central Valley of California under 17 scenarios of projected climate, urbanization, and water supply management (for more information about scenarios see scenario description and Table 1 in Matchett and Fleskes [2018]). Central Valley waterbird habitats investigated in th
Data for projected impacts of climate, urbanization, water management, and wetland restoration on waterbird habitat in California's Central Valley
The Central Valley of California is one of the most important regions for wintering waterbirds in North America despite extensive anthropogenic landscape modification and decline of historical wetlands there. Like many other mediterranean-climate ecosystems across the globe, the Central Valley has been subject to a burgeoning human population and expansion and intensification of agricultural and
Filter Total Items: 41
Body mass changes of dabbling and diving ducks wintering in California
Bird body mass is often used as an index of body condition and fluctuates throughout the year in response to environmental conditions and avian life-history events. We examined the body mass of 59,572 ducks representing 13 species (7 dabbling duck species and 6 diving duck species) harvested within the 3 regions of the Central Valley in California, USA (Sacramento Valley, Suisun Marsh, San Joaquin
Authors
Mark P. Herzog, Josh T. Ackerman, Jeffrey D. Kohl, Brady Lynn Fettig, C. Alex Hartman, Sarah H. Peterson, Michael L. Casazza, Joseph P. Fleskes
Assessment of cereal grain waste densities to aid waterfowl conservation planning in the Klamath Basin
Postharvest waste seed from cereal grains is a major dietary component of waterfowl in the Klamath Basin in northeastern California and southeastern Oregon, a region that plays host to over a million waterfowl annually. Understanding food abundance is critical to local waterfowl management; therefore, we conducted a study in 2008 to investigate waste grain densities in barley, oat, and wheat field
Authors
Daniel A. Skalos, Joseph P. Fleskes, Jeffery D. Kohl, Mark P. Herzog, Michael L. Casazza
Changes in the abundance and distribution of waterfowl wintering in the Central Valley of California, 1973–2000
The Central Valley of California is one of the most important areas for wintering waterfowl in the world and the focus of extensive conservation efforts to mitigate for historical losses and counter continuing stressors to habitats. To guide conservation, we analyzed trends in the abundance and distribution (spatiotemporal abundance patterns) of waterfowl and their habitats in the Central Valley a
Authors
Joseph P. Fleskes, Michael L. Casazza, Cory T. Overton, Elliott Matchett, Julie L. Yee
Body condition of wintering Pacific greater white-fronted geese
Extreme changes to key waterfowl habitats in the Klamath Basin (KB) on the Oregon–California border and the Sacramento Valley (SV) in California, USA, have occurred since 1980. The spatial distribution of Pacific greater white‐fronted geese (Anser albifrons sponsa; geese) has likewise changed among these areas and population size has grown from 79,000 to >600,000 geese during the same period. To a
Authors
Daniel A. Skalos, John M. Eadie, Daniel R. Yparraguirre, Melanie L. Weaver, Shaun L. Oldenburger, Craig R. Ely, Julie L. Yee, Joseph P. Fleskes
Linking nest microhabitat selection to nest survival within declining pheasant populations in the Central Valley of California
Context: The ring-necked pheasant (Phasianus colchicus) has experienced considerable population declines in recent decades, especially in agricultural environments of the Central Valley of California. Although large-scale changes in land cover have been reported as an important driver of population dynamics, the effects of microhabitat conditions on specific demographic rates (e.g. nesting) are la
Authors
Ian Dwight, Jessica H Vogt, Peter S. Coates, Joseph P. Fleskes, Daniel P. Connelly, Scott C. Gardner
Monitoring breeding and survival of ring-necked pheasant (Phasianus colchicus) in the Sacramento Valley, Sacramento-San Joaquin River Delta, and Klamath Basin, northern California—Five-year summary, 2013–17
The U.S. Geological Survey Western Ecological Research Center, Pheasants Forever, Mandeville Island Duck Club, and the California Department of Fish and Wildlife collaborated in a reconnaissance study to monitor populations of ring-necked pheasant (Phasianus colchicus) using radio-telemetry in the Sacramento Valley, Sacramento-San Joaquin River Delta, and Klamath Basin of northern California. The
Authors
Ian A. Dwight, Peter S. Coates, Jessica H. Vogt, Joseph L. Atkinson, Joseph P. Fleskes, Daniel P. Connelly, Matt G. Meshriy, Scott C. Gardner, Simone T. Stoute, Maurice E. Pitesky
California mallards: a review
Mallards (Anas platyrhynchos) are the most abundant breeding waterfowl species in California and are important to waterfowl hunters in the state. California is unique among major North American wintering waterfowl areas, in that most mallards harvested in California are also produced in California, meaning that California must provide both high quality wintering and breeding habitats for mallard p
Authors
Cliff L. Feldheim, Joshua T. Ackerman, Shaun L. Oldenburger, John M. Eadie, Joseph P. Fleskes, Gregory S. Yarris
Waterbird habitat in California's Central Valley basins under climate, urbanization, and water management scenarios
California's Central Valley provides critical, but threatened habitat and food resources for migrating and wintering waterfowl, shorebirds, and other waterbirds. The Central Valley is comprised of nine basins that were defined by the Central Valley Joint Venture (CVJV) to assist in conservation planning. Basins vary in composition and extent of habitats, which primarily include croplands and wetla
Authors
Elliott Matchett, Joseph P. Fleskes
Surveillance for highly pathogenic influenza A viruses in California during 2014–2015 provides insights into viral evolutionary pathways and the spatiotemporal extent of viruses in the Pacific Americas Flyway
We used surveillance data collected in California before, concurrent with, and subsequent to an outbreak of highly pathogenic (HP) clade 2.3.4.4 influenza A viruses (IAVs) in 2014–2015 to (i) evaluate IAV prevalence in waterfowl, (ii) assess the evidence for spill-over infections in marine mammals and (iii) genetically characterize low-pathogenic (LP) and HP IAVs to refine inference on the spatiot
Authors
Andrew M. Ramey, Nichola J. Hill, Troy Cline, Magdalena Plancarte, Susan De La Cruz, Michael L. Casazza, Joshua T. Ackerman, Joseph P. Fleskes, T. Winston Vickers, Andrew B. Reeves, Frances Gulland, Christine Fontaine, Diann J. Prosser, Jonathan Runstadler, Walter M. Boyce
Body mass, wing length, and condition of wintering ducks relative to hematozoa infection
Waterfowl managers lack information regarding factors that may be reducing the positive response of waterfowl body condition to habitat improvements. Protozoan blood parasites (i.e., hematozoa) are commonly found in birds and have been related to reduced body mass, wing length, and body condition. We studied relationships between 12 measures of hematozoa infection and body mass, wing length, and b
Authors
Joseph P. Fleskes, Andrew M. Ramey, Andrew B. Reeves, Julie L. Yee
Projected impacts of climate, urbanization, water management, and wetland restoration on waterbird habitat in California’s Central Valley
The Central Valley of California is one of the most important regions for wintering waterbirds in North America despite extensive anthropogenic landscape modification and decline of historical wetlands there. Like many other mediterranean-climate ecosystems across the globe, the Central Valley has been subject to a burgeoning human population and expansion and intensification of agricultural and u
Authors
Elliott Matchett, Joseph P. Fleskes
Modeling waterfowl habitat selection in the Central Valley of California to better understand the spatial relationship between commercial poultry and waterfowl
Wildlife researchers frequently study resource and habitat selection of wildlife to understand their potential habitat requirements and to conserve their populations. Understanding wildlife spatial-temporal distributions related to habitat have other applications such as to model interfaces between wildlife and domestic food animals in order to mitigate disease transmission to food animals. The hi
Authors
Elliott Matchett, Michael L. Casazza, Joseph P. Fleskes, T. Kelman, M. Cadena, M. Pitesky
Science and Products
Assessing the Impacts of Drought on Migratory Waterbirds in Key Conservation Regions of the Western U.S.
Migratory birds may be hit especially hard by climate change – particularly waterbirds that depend on wetlands as resting and feeding sites during their journey between breeding and non-breeding grounds. California’s Central Valley and the interior basins of southeastern Oregon and northeastern California provide some of the most critical wetlands resources to migratory waterbirds in the western U
The Impact of Drought on Waterbirds and Their Wetland Habitats in California’s Central Valley
California’s Central Valley is a nexus for water resources in the state, draining the Sacramento and San Joaquin River watersheds. Urban centers, agricultural operations, and the environment all compete for limited water, and demand is expected to only increase as the population grows and agriculture intensifies. At the same time, the water supply is projected to decrease as temperatures rise, pre
Recent historical and projected (years 2006-99) areas (km2) of managed, flooded habitats used by waterbirds overwintering in Central Valley, California basins for 17 climate, urbanization, and water management scenarios
Matchett and Fleskes (2018) evaluated availability of wetland and agricultural habitats used by waterbirds overwintering in the Central Valley of California under 17 scenarios of projected climate, urbanization, and water supply management (for more information about scenarios see scenario description and Table 1 in Matchett and Fleskes [2018]). Central Valley waterbird habitats investigated in th
Data for projected impacts of climate, urbanization, water management, and wetland restoration on waterbird habitat in California's Central Valley
The Central Valley of California is one of the most important regions for wintering waterbirds in North America despite extensive anthropogenic landscape modification and decline of historical wetlands there. Like many other mediterranean-climate ecosystems across the globe, the Central Valley has been subject to a burgeoning human population and expansion and intensification of agricultural and
Filter Total Items: 41
Body mass changes of dabbling and diving ducks wintering in California
Bird body mass is often used as an index of body condition and fluctuates throughout the year in response to environmental conditions and avian life-history events. We examined the body mass of 59,572 ducks representing 13 species (7 dabbling duck species and 6 diving duck species) harvested within the 3 regions of the Central Valley in California, USA (Sacramento Valley, Suisun Marsh, San Joaquin
Authors
Mark P. Herzog, Josh T. Ackerman, Jeffrey D. Kohl, Brady Lynn Fettig, C. Alex Hartman, Sarah H. Peterson, Michael L. Casazza, Joseph P. Fleskes
Assessment of cereal grain waste densities to aid waterfowl conservation planning in the Klamath Basin
Postharvest waste seed from cereal grains is a major dietary component of waterfowl in the Klamath Basin in northeastern California and southeastern Oregon, a region that plays host to over a million waterfowl annually. Understanding food abundance is critical to local waterfowl management; therefore, we conducted a study in 2008 to investigate waste grain densities in barley, oat, and wheat field
Authors
Daniel A. Skalos, Joseph P. Fleskes, Jeffery D. Kohl, Mark P. Herzog, Michael L. Casazza
Changes in the abundance and distribution of waterfowl wintering in the Central Valley of California, 1973–2000
The Central Valley of California is one of the most important areas for wintering waterfowl in the world and the focus of extensive conservation efforts to mitigate for historical losses and counter continuing stressors to habitats. To guide conservation, we analyzed trends in the abundance and distribution (spatiotemporal abundance patterns) of waterfowl and their habitats in the Central Valley a
Authors
Joseph P. Fleskes, Michael L. Casazza, Cory T. Overton, Elliott Matchett, Julie L. Yee
Body condition of wintering Pacific greater white-fronted geese
Extreme changes to key waterfowl habitats in the Klamath Basin (KB) on the Oregon–California border and the Sacramento Valley (SV) in California, USA, have occurred since 1980. The spatial distribution of Pacific greater white‐fronted geese (Anser albifrons sponsa; geese) has likewise changed among these areas and population size has grown from 79,000 to >600,000 geese during the same period. To a
Authors
Daniel A. Skalos, John M. Eadie, Daniel R. Yparraguirre, Melanie L. Weaver, Shaun L. Oldenburger, Craig R. Ely, Julie L. Yee, Joseph P. Fleskes
Linking nest microhabitat selection to nest survival within declining pheasant populations in the Central Valley of California
Context: The ring-necked pheasant (Phasianus colchicus) has experienced considerable population declines in recent decades, especially in agricultural environments of the Central Valley of California. Although large-scale changes in land cover have been reported as an important driver of population dynamics, the effects of microhabitat conditions on specific demographic rates (e.g. nesting) are la
Authors
Ian Dwight, Jessica H Vogt, Peter S. Coates, Joseph P. Fleskes, Daniel P. Connelly, Scott C. Gardner
Monitoring breeding and survival of ring-necked pheasant (Phasianus colchicus) in the Sacramento Valley, Sacramento-San Joaquin River Delta, and Klamath Basin, northern California—Five-year summary, 2013–17
The U.S. Geological Survey Western Ecological Research Center, Pheasants Forever, Mandeville Island Duck Club, and the California Department of Fish and Wildlife collaborated in a reconnaissance study to monitor populations of ring-necked pheasant (Phasianus colchicus) using radio-telemetry in the Sacramento Valley, Sacramento-San Joaquin River Delta, and Klamath Basin of northern California. The
Authors
Ian A. Dwight, Peter S. Coates, Jessica H. Vogt, Joseph L. Atkinson, Joseph P. Fleskes, Daniel P. Connelly, Matt G. Meshriy, Scott C. Gardner, Simone T. Stoute, Maurice E. Pitesky
California mallards: a review
Mallards (Anas platyrhynchos) are the most abundant breeding waterfowl species in California and are important to waterfowl hunters in the state. California is unique among major North American wintering waterfowl areas, in that most mallards harvested in California are also produced in California, meaning that California must provide both high quality wintering and breeding habitats for mallard p
Authors
Cliff L. Feldheim, Joshua T. Ackerman, Shaun L. Oldenburger, John M. Eadie, Joseph P. Fleskes, Gregory S. Yarris
Waterbird habitat in California's Central Valley basins under climate, urbanization, and water management scenarios
California's Central Valley provides critical, but threatened habitat and food resources for migrating and wintering waterfowl, shorebirds, and other waterbirds. The Central Valley is comprised of nine basins that were defined by the Central Valley Joint Venture (CVJV) to assist in conservation planning. Basins vary in composition and extent of habitats, which primarily include croplands and wetla
Authors
Elliott Matchett, Joseph P. Fleskes
Surveillance for highly pathogenic influenza A viruses in California during 2014–2015 provides insights into viral evolutionary pathways and the spatiotemporal extent of viruses in the Pacific Americas Flyway
We used surveillance data collected in California before, concurrent with, and subsequent to an outbreak of highly pathogenic (HP) clade 2.3.4.4 influenza A viruses (IAVs) in 2014–2015 to (i) evaluate IAV prevalence in waterfowl, (ii) assess the evidence for spill-over infections in marine mammals and (iii) genetically characterize low-pathogenic (LP) and HP IAVs to refine inference on the spatiot
Authors
Andrew M. Ramey, Nichola J. Hill, Troy Cline, Magdalena Plancarte, Susan De La Cruz, Michael L. Casazza, Joshua T. Ackerman, Joseph P. Fleskes, T. Winston Vickers, Andrew B. Reeves, Frances Gulland, Christine Fontaine, Diann J. Prosser, Jonathan Runstadler, Walter M. Boyce
Body mass, wing length, and condition of wintering ducks relative to hematozoa infection
Waterfowl managers lack information regarding factors that may be reducing the positive response of waterfowl body condition to habitat improvements. Protozoan blood parasites (i.e., hematozoa) are commonly found in birds and have been related to reduced body mass, wing length, and body condition. We studied relationships between 12 measures of hematozoa infection and body mass, wing length, and b
Authors
Joseph P. Fleskes, Andrew M. Ramey, Andrew B. Reeves, Julie L. Yee
Projected impacts of climate, urbanization, water management, and wetland restoration on waterbird habitat in California’s Central Valley
The Central Valley of California is one of the most important regions for wintering waterbirds in North America despite extensive anthropogenic landscape modification and decline of historical wetlands there. Like many other mediterranean-climate ecosystems across the globe, the Central Valley has been subject to a burgeoning human population and expansion and intensification of agricultural and u
Authors
Elliott Matchett, Joseph P. Fleskes
Modeling waterfowl habitat selection in the Central Valley of California to better understand the spatial relationship between commercial poultry and waterfowl
Wildlife researchers frequently study resource and habitat selection of wildlife to understand their potential habitat requirements and to conserve their populations. Understanding wildlife spatial-temporal distributions related to habitat have other applications such as to model interfaces between wildlife and domestic food animals in order to mitigate disease transmission to food animals. The hi
Authors
Elliott Matchett, Michael L. Casazza, Joseph P. Fleskes, T. Kelman, M. Cadena, M. Pitesky