Migratory Birds

To document movement patterns and habitat use of Hawiian Hawks, GPS tags were attached to 17 individuals to track their movement across continuous, fragmented, and urban landscapes. We are now gathering multi-year tracking data to assess key aspects of habitat needs, and how these birds navigate through different ecosystems.

Data on the distribution and abundance of seabirds at sea have been used for many decades to assist in understanding the marine ecology of seabirds away from their breeding colonies, measure population status and trends, assess the impact of human activities on ocean habitats and fish stocks, and to identify critical marine habitats for seabirds.

Birds are excellent indicators of ecosystem condition because they are responsive to environmental change, have important ecological functions – such as seed dispersal and insect consumption, and are easy to observe.

To assess use of dredge material areas, avian ecologists from USGS WARC are conducting bird surveys across the annual life cycle.

Available here are tracking data of Common Eider, a sea duck species found across Alaska and the Arctic. Some populations migrate between distant breeding and wintering areas while others are essentially nonmigratory. These data were collected to better understand the migration of the different populations in Alaska and migratory connectivity to adjacent regions, such as Russia.

WARC researchers partnered with managers and species experts to develop a Bayesian network model and a geospatial habitat characteristics dataset to predict the number of Brown Pelican breeding pairs on islands in the northern Gulf of Mexico.

WARC researchers partnered with managers and species experts to develop a Bayesian network model and a geospatial habitat characteristics dataset to predict the number of breeding pairs of Black Skimmer and Gull-billed Tern along the northern Gulf of Mexico.

Using ecological and geographical data, WARC researchers and their partners are analyzing avian and benthic sampling on Whiskey Island and Caminda Headland to compare pre- and post-restoration aspects of habitat occupancy, habitat availability, habitat use, and kernal density estimation.

USGS scientists are using a spatially-explicit Bayesian network model to predict the difference between energetic value and energetic demand for stopover habitats for migrating landbirds.

USGS scientists will be analyzing weather surveillance radar observations of birds departing stopover habitats to measure responses to climate change.

Available here are tracking data of Spectacled Eider, a sea duck species that breeds only in Alaska and Russia and spends the winter exclusively in the Bering Sea. The Alaska breeding population is listed as threatened under provisions of the Endangered Species Act. These data were collected to better understand the winter distribution in the Bering Sea and locate birds for winter aerial surveys...

Along the Santa Clara River in California, populations of the federally and state-listed Least Bell's Vireo ( Vireo bellii pusillus ) are recovering from near extirpation. Habitat protection and restoration, as well as reducing brood parasitism by Brown-headed Cowbirds ( Molothrus ater ), are thought to be the primary drivers of this recovery. The challenge going forward is to find the right...