Fact sheet on the historic and current conditions of mangroves
of Dry Tortugas National Park, a cluster of islands and coral
reefs west of Key West, Florida. Mangroves and nesting frigate
bird colonies are at risk to destruction by hurricanes. Doppler
radar imaging is used for tracking the migration and behavior of
bird populations. With the U.S. Fish and Wildlife Service and
other agencies, USGS uses this technology to assist decision
makers balance natural and industrial concerns Updated summaries
of research in the Arctic National Wildlife Refuge, Alaska, on
caribou, muskoxen, predators (grizzly bears, wolves, golden
eagles), polar bears, snow geese and their wildlife habitats
with maps of land-cover and vegetation. Fact sheet on the need
to protect biological soil crusts in the desert. These crusts
are most of the soil surface in deserts not covered by green
plants and are inhabited by cyanobacterium (blue-green algae)
and other organisms useful to the ecosystem. Overview of
research of the Ecology Branch