Michael Casazza
Biography
RESEARCH INTERESTS
Mike Casazza's research program at the Dixon Field Station focuses on the ecology of waterfowl and wetland management in the Pacific Flyway. Mike and his team are experts in wildlife telemetry and apply cutting edge tools to answer complex ecological questions. In addition, Mike’s program also focuses on threatened and endangered species in a variety of ecosystems including primary ecological research on the endangered California Ridgway's Rail in SF Bay, the endangered San Francisco Gartersnake, the threatened Giant Gartersnake in the Central Valley of California, the California state-listed Greater Sandhill Crane, and the Greater Sage-Grouse. Mike Casazza's research has targeted studies which provide critical species information to land managers responsible for maintaining diverse and healthy wildlife populations while trying to help recover special status species. Understanding key life history traits of special status species can lead to management options promoting species recovery.
EDUCATION
- 1995 M.S. California State University, Sacramento Thesis: Habitat use and movement of Northern Pintails wintering in Suisun Marsh, CA
- 1988 B.S. Wildlife Biology, U.C. Davis
Science and Products
Goose Population Dynamics in the California Central Valley and Pacific Flyway
USGS scientists and partners are studying how growing goose populations in the California Central Valley wintering areas are affecting ducks and other waterfowl.
Webinar: Linking Remote Sensing and Bird Behavior Data to Understand the Impacts of Drought on Waterfowl
View this webinar to learn how scientists are exploring the impacts of drought on waterfowl.
Suisun Marsh Waterfowl and Waterbird Studies
Suisun Marsh provides critical habitat for wintering and breeding waterbirds in California. USGS WERC collaborates with the California Department of Water Resources to examine trends in bird declines and to assess the habitat factors driving long-term survival of waterfowl, rails, and other birds in this important area.
Waterfowl Ecology in California and the Pacific Flyway
The Suisun Marsh and Central Valley in California offer some of the world’s most important wetland habitats for waterfowl in the Pacific Flyway. Mike Casazza and USGS WERC biologists are providing the science to support and evaluate waterfowl populations and habitat management in North America.
Ecology and Population Dynamics of Ridgway's Rails along the West Coast of the U.S.
The Ridgway’s rail is a federal and state listed endangered species that occurs in wetlands along the Pacific Coast and from the Lower Colorado River drainage to southern Baja California. Three subspecies of Ridgway’s rail are found within the United States: the California Ridgway’s Rail, Yuma Ridgway’s rail, and Light-footed Ridgway’s rail. All three subspecies have declined since 1900 as a...
Dixon Field Station
WERC scientists at the Dixon Field Station conduct studies from the San Francisco Bay-Delta in California to the Great Basin spanning California and Nevada.
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...
Effects of Sea-Level Rise and Extreme Storms on California Coastal Habitats: Part 1
In California, the near-shore area where the ocean meets the land is a highly productive yet sensitive region that supports a wealth of wildlife, including several native bird species. These saltmarshes, mudflats, and shallow bays are not only critical for wildlife, but they also provide economic and recreational benefits to local communities. Today, sea-level rise, more frequent and stronger...
Fate of Endangered Species in San Francisco Bay Tidal Marshes with Sea-Level Rise
The San Francisco Bay estuary contains the largest remaining expanse of tidal salt marshes in the western U.S. These marshes are home to a variety of federal and state protected species, such as the California clapper rail, California black rail, and the salt marsh harvest mouse. The estuary is also located on the Pacific Flyway, and is an important site for migrating and wintering birds. As...
Geospatial data for object-based high-resolution classification of conifers within greater sage-grouse habitat across Nevada and a portion of northeastern California (ver. 2.0 July 2018)
These products were developed to provide scientific and correspondingly spatially explicit information regarding the distribution and abundance of conifers (namely, singleleaf pinyon (Pinus monophylla), Utah juniper (Juniperus osteosperma), and western juniper (Juniperus occidentalis)) in Nevada and portions of northeastern California. Encroachment of these trees into sagebr
Geospatial data for object-based high-resolution classification of conifers within the geographic range of the Bi-State Distinct Population Segment of greater sage-grouse in California and Nevada
These products were developed to provide scientific and correspondingly spatially explicit information regarding the distribution and abundance of conifers (namely, singleleaf pinyon (Pinus monophylla), Utah juniper (Juniperus osteosperma), and western juniper (Juniperus occidentalis)) in Nevada and portions of northeastern California. Encroachment of these trees into sagebr
Coastal California San Francisco Gartersnake Capture-Mark-Recapture Data (2008-2013)
These data are multi-state capture histories of 273 individual San Francisco gartersnakes collected at a site before and after a portion of the site was burned. Data collection began in 2008 and continued until 2013, and the prescribed fire was applied in the fall of 2010.
Microhabitat and Vegetation Selection by Giant Gartersnakes Associated with a Restored Marsh in California
These data describe differences in percent cover of microhabitats and vegetation types at giant gartersnake locations and random points paired with giant gartersnake locations for use in case-control logistic regression. The data also include information on the individual snake, the year of observation, and whether the individual had moved from its previous location to allow for correlation o...
A Century of Landscape Disturbance and Urbanization of the San Francisco Bay Region affects the Present-day Genetic Diversity of the California Ridgway’s Rail (Rallus obsoletus obsoletus).
Fragmentation and loss of natural habitat have important consequences for wild populations and can negatively affect long-term viability and resilience to environmental change. Salt marsh obligate species, such as those that occupy the San Francisco Bay Estuary in western North America, occupy already impaired habitats as result of human development and modifications and are highly susceptible...
Gambel’s quail survey variability and implications for survey design in the Mohave Desert
Careful design of a wildlife population monitoring strategy is necessary to obtain accurate and precise results whether the purpose of the survey is development of habitat suitability models, to estimate abundance, or assess site occupancy. Important characteristics to consider in survey design are sources of elevated variability, particularly...
Overton, Cory T.; Casazza, Michael L.; Connelley, Daniel; Gardner, Scott C. Good prospects: High-resolution telemetry data suggests novel brood-site selection behavior in waterfowl
Breeding success should increase with prior knowledge of the surrounding environment, which is dependent upon an animal’s ability to evaluate habitat. Prospecting for nesting locations and migratory stop-over sites are well-established behaviors among bird species. We assessed whether ducks in Suisun Marsh, California, USA, a brackish marsh,...
Casazza, Michael L.; McDuie, Fiona; Lorenz, Austen; Keiter, David A.; Yee, Julie L.; Overton, Cory T.; Peterson, Sarah H.; Feldheim, Cliff L.; Ackerman, Joshua T. Timing, frequency, and duration of incubation recesses in dabbling ducks
Nest attendance is an important determinant of avian reproductive success, and identifying factors that influence the frequency and duration of incubation recesses furthers our understanding of how incubating birds balance their needs with those of their offspring. We characterized the frequency and timing (start time, end time, and duration) of...
Croston, Rebecca; Hartman, C. Alex; Herzog, Mark P.; Casazza, Michael L.; Feldheim, Cliff L.; Ackerman, Joshua T. Spatially explicit models of seasonal habitat for greater sage‐grouse at broad spatial scales: Informing areas for management in Nevada and northeastern California
Defining boundaries of species' habitat across broad spatial scales is often necessary for management decisions, and yet challenging for species that demonstrate differential variation in seasonal habitat use. Spatially explicit indices that incorporate temporal shifts in selection can help overcome such challenges, especially for species of high...
Coates, Peter S.; Brussee, Brianne E.; Ricca, Mark A.; Severson, John; Casazza, Michael L.; Gustafson, K. Ben; Espinosa, Shawn P.; Gardner, Scott C.; Delahunty, David J Conservation reliance of a threatened snake on rice agriculture
Conservation-reliant species require perpetual management by humans to persist. But do species that persist largely in human-dominated landscapes actually require conditions maintained by humans? Because most extant populations of giant gartersnakes (Thamnophis gigas) inhabit the highly modified rice agricultural regions of the Sacramento Valley,...
Halstead, Brian J.; Rose, Jonathan P.; Reyes, Gabriel; Wylie, Glenn D.; Casazza, Michael L. Limited detection of antibodies to clade 2.3.4.4 A/Goose/Guangdong/1/1996 lineage highly pathogenic H5 avian influenza virus in North American waterfowl
During 2014, highly pathogenic (HP) influenza A viruses (IAVs) of the A/Goose/Guangdong/1/1996 lineage (GsGD-HP-H5), originating from Asia, were detected in domestic poultry and wild birds in Canada and the US. These clade 2.3.4.4 GsGD-HP-H5 viruses included reassortants possessing North American lineage gene segments; were detected in wild birds...
Stallknecht, David E.; Kienzle-Dean, Clara; Davis-Fields, Nick; Jennelle, Christopher S.; Bowman, Andrew S.; Nolting, Jacqueline M.; Boyce, Walter; Crum, James; Santos, Jefferson; Brown, Justin D.; Prosser, Diann; De La Cruz, Susan E. W.; Ackerman, Joshua T.; Casazza, Michael L.; Krauss, Scott; Perez, Daniel; Ramey, Andrew M.; Poulson, Rebecca L. Estimating sightability of greater sage-grouse at leks using an aerial infrared system and N-mixture models
Counts of grouse present at leks (breeding grounds) during spring are widely used to monitor population numbers and assess trends. However, only a proportion of birds available to count are detected resulting in a biased population index. We designed a study using an aerial integrated infrared imaging system (AIRIS) and experimental pseudo-leks to...
Coates, Peter S.; Wann, Gregory T.; Gillette, Gifford L.; Ricca, Mark A.; Prochazka, Brian G.; Severson, John P.; Andrle, Katie M.; Espinosa, Shawn P.; Casazza, Michael L.; Delehanty, David J. Moving at the speed of flight: Dabbling duck-movement rates and the relationship with electronic tracking interval
Context. Effective wildlife management requires information on habitat and resource needs, which can be estimated with movement information and modelling energetics. One necessary component of avian models is flight speeds at multiple temporal scales. Technology has limited the ability to accurately assess flight speeds, leading to estimates of...
McDuie, Fiona; Casazza, Michael L.; Keiter, David A.; Overton, Cory T.; Herzog, Mark P.; Feldheim, Cliff L.; Ackerman, Joshua T. Global positioning system tracking devices can decrease Greater Sage-Grouse survival
Reliable demographic estimates hinge on the assumption that marking animals does not alter their behavior, reproduction, or survival. Violations can bias inference and are especially egregious for species of high conservation concern. Global positioning system (GPS) devices represent a recent technological advancement that has contributed greatly...
Severson, John P.; Coates, Peter S.; Prochazka, Brian G.; Ricca, Mark A.; Casazza, Michael L.; Delahunty, David J Demographic factors affecting population growth in giant gartersnakes
Demographic models provide insight into which vital rates and life stages contribute most to population growth. Integral projection models (IPMs) offer flexibility in matching model structure to a species’ demography. For many rare species, data are lacking for key vital rates, and uncertainty might dissuade researchers from attempting to build a...
Rose, Jonathan P.; Ersan, Julia; Wylie, Glenn D.; Casazza, Michael L.; Halstead, Brian J. Sitting ducklings: Timing of hatch, nest departure, and predation risk for dabbling duck broods
For ground‐nesting waterfowl, the timing of egg hatch and duckling departure from the nest may be influenced by the risk of predation at the nest and en route to wetlands and constrained by the time required for ducklings to imprint on the hen and be physically able to leave the nest. We determined the timing of hatch, nest departure, and...
Peterson, Sarah H.; Ackerman, Joshua T.; Herzog, Mark P.; Hartman, Christopher; Croston, Rebecca; Feldheim, Cliff L.; Casazza, Michael L. GPS tracking data reveals daily spatio-temporal movement patterns of waterfowl
BackgroundSpatio-temporal patterns of movement can characterize relationships between organisms and their surroundings, and address gaps in our understanding of species ecology, activity budgets, bioenergetics, and habitat resource management. Highly mobile waterfowl, which can exploit resources over large spatial extents, are excellent models to...
McDuie, Fiona; Casazza, Michael L.; Overton, Cory T.; Herzog, Mark P.; Hartman, C. Alex; Peterson, Sarah H.; Feldheim, Cliff L.; Ackerman, Joshua T.
Dabbling Duck Flight Speeds: High Tech Update For the 21st Century
In a recent study, U.S. Geological Survey biologists used technologically advanced GSM-GPS transmitters to calculate migratory and non-migratory flight speeds of six species of dabbling ducks. The highly improved flight speed estimates are the first in nearly a century and provide the science for resource managers to better estimate food and habitat requirements for dabbling ducks.
Research Spotlight: California Central Valley Ducks Move Shorter Distances and Use Smaller Areas Than Expected
In a new publication, U.S. Geological Survey biologists report the results of real-time tracking of three species of dabbling ducks in California’s Central Valley with GPS to examine the ducks’ fine-scale 24-hour movement patterns.
Secrets of Suisun Marsh's Birds of Prey
Did you know that the USGS is studying raptors in California? Biologists with the USGS Western Ecological Research Center are hard at work in the field, learning more about the ecology of Northern Harriers and their interactions with migratory waterfowl of concern to the U.S. Fish and Wildlife Service.
Livestock grazing effects on sage-grouse: study identifies options to sustain ranching and help wildlife
Effects of livestock grazing on greater sage-grouse populations can be positive or negative depending on the amount of grazing and when grazing occurs, according to research published today in Ecological Applications. The research was conducted by scientists from the United States Geological Survey, Colorado State University and Utah State University.
Cumulative Effects of Wildfire Adversely Affect Greater Sage-Grouse in the Great Basin
Slowing fire-related population declines in greater sage-grouse in the Great Basin over the next 30 years may depend on the intensity of fire suppression efforts in core breeding areas and long-term patterns of precipitation, according to a just-published USGS-led study.