WERC Waterfowl Science at the 2018 Suisun Marsh Field Day

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“If we find a duck with one of those, we say it’s wearing jewelry,” said a visitor, gesturing to the shining metal bands on the table. The bands in question were part of a USGS Western Ecological Research Center (WERC) outreach display at the 2018 Suisun Marsh Field Day in Suisun, CA.

Andrea Mott and Brady Fettig, biological science technicians based out of the Dixon Field Station, taught families about ongoing efforts to learn more about waterfowl populations, movements, and habitat use within Suisun Marsh and the greater Pacific Flyway.

Unique ID bands for waterfowl

USGS scientists attach small metal bands, each with its own ID, to the ankles of adult waterfowl to identify where the animal was caught. (Credit: Xochitl Rojas-Rocha, USGS Western Ecological Research Center. Public domain.)

Attaching small metal bands to the ankles of waterfowl is only one part of the project, but an important one. Each band includes a unique identifier that is entered into a database, along with the sex, approximate age, and physical condition of the animal, and its location during its first capture. When hunters, citizens, and scientists report the locations of band sightings, WERC scientists use this information to estimate how far waterfowl travel during migration.

USGS WERC researchers Josh Ackerman and Mike Casazza’s teams are combining this simple yet effective method with more complex technologies, like solar-powered GPS tags for adult ducks and radio transmitters light enough to fit comfortably on a duckling. Visitors at the WERC outreach booth got to handle examples of both, and see how a transmitter might fit on a duckling, with a beanie-bag toy for scale.

A GPS tag collects data on an adult duck’s movements until the animal reaches the end of its life, and the tag can be recovered. The lightweight radio transmitters placed on ducklings fall off after several weeks. To find them, members of the waterfowl team travel out to the marsh equipped with a radio antenna that ‘pings’ when their target is near. The fate of the radio transmitter often provides clues as to the duckling’s fate — was it consumed by one of the marsh’s many predators? Did it survive to see another season?

All of this hard work is supporting science-based conservation and management of waterfowl populations and habitat in California’s Central Valley. With the latest data on waterfowl numbers, private landowners, state agencies, and non-profit organizations — including the California Waterfowl Association, host of the annual Suisun Marsh Field Day — can make more informed decisions to preserve Suisun’s landscapes and wildlife for the future.

To learn more about WERC studies on waterfowl ecology within California, visit the central webpage here.

Child "candling" a chicken egg

A child peers at an unfertilized chicken egg at the USGS outreach booth, 2018 Suisun Marsh Field Day. USGS waterfowl ecologists use this method to check the development of a fetal duckling in the field. *Note: photo taken with permission of parent.

(Credit: Xochitl Rojas-Rocha, USGS Western Ecological Research Center. Public domain.)

Member of public examines fake GPS tag

A member of the public stops by the USGS booth at the 2018 Suisun Marsh Field Day to examine a fake GPS tag. USGS ecologists are attaching solar-powered GPS tags to the backs of adult waterfowl to learn more about their movements across Suisun Marsh, CA and the greater Pacific Flyway. (Credit: Xochitl Rojas-Rocha, USGS Western Ecological Research Center. Public domain.)

USGS employee speaks to public about waterfowl ecology

Andrea, a USGS employee, explains waterfowl ecology in Suisun Marsh, CA to members of the public. (Credit: Xochitl Rojas-Rocha, USGS Western Ecological Research Center. Public domain.)

Waterfowl photos at USGS outreach booth

The USGS outreach booth at the 2018 Suisun Marsh Field Day had plenty of cute duckling photos, hands-on tools used by scientists in the field, and even a beanie-baby duckling with a tiny radio transmitter attached to its back for scale. (Credit: Xochitl Rojas-Rocha, USGS Western Ecological Research Center. Public domain.)


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Date published: June 30, 2018
Status: Active

Suisun Marsh Waterfowl and Wildlife 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.