Tracking Bird Movements with Transmitters
The new generation of wildlife tracking devices has opened up the possibility of addressing a broad range of questions that researchers could not have dreamed of answering just a decade ago. For many species of birds we are now able to examine their daily and annual lives in a way never before possible. CCB biologists have over 30 years of experience tracking birds with a variety of different techniques including traditional VHF, digital coded VHF, Argos satellite transmitters, GPS transmitters, GSM transmitters, and geolocators. Tracking birds is an art with many hours spent carefully planning attachment and trapping techniques to reduce impacts to birds.
In 2007 CCB initiated a wide-scale bald eagle tracking study, following the movements of eagles throughout the Chesapeake Bay and beyond. Eagles from three source populations were trapped and tagged with GPS or GSM transmitters. This work has identified important shoreline habitats, communal roost locations, and areas of high eagle mortality from electrical infrastructure. In the long term, information gained from these birds will help us to better understand eagle ecology and how to better manage the species within an increasingly human-dominated landscape. Tracking maps for all 70 eagles may be accessed on www.wildlifetracking.org.
CCB consults with other wildlife and conservation agencies to plan and conduct eagle tracking projects around the country including Kentucky, New Jersey, Maine, and Idaho. Please contact Libby Mojica [email protected] if you would like assistance with an upcoming project.
CCB has successfully tracked over 20 Whimbrels from their breeding grounds in the Arctic to their wintering grounds in the Caribbean and in South America. The tracking data has revealed previously unknown migratory routes which link breeding populations to migratory stopover sites throughout North America. These stopover sites provide critical staging areas for whimbrels and other migrating shorebirds to refuel before the next leg of their journey.
CCB began a research program called FalconTrak as a cooperative project designed to answer questions about the movements and survival of Peregrine Falcons (Falco peregrinus) within the mid-Atlantic region of North America. Sixty-one falcons were tracked between 2001 and 2012 with solar-powered, satellite transmitters to investigate the spatial dynamics of their annual cycle and to identify causes of mortality.
In 2008, The Center for Conservation Biology (CCB) initiated a long-term study of Golden Eagles in the mid-Atlantic region. In cooperation with the US Army at Aberdeen Proving Ground, 2 golden eagles were trapped on deer carcasses in March 2008 on the upper Chesapeake Bay. That same month, a third golden was trapped in Highland Co, VA. A 70g GPS-PTT satellite transmitter (Microwave Telemetry, Inc) was fitted to each bird with a backpack style harness. All three Golden Eagles winter in the mid-Atlantic region and summer in Eastern Canada and Maine. Migration routes and timing are being used to inform management and are combined with other golden eagle data through CCB’s participation in the Eastern Golden Eagle Working Group.
Crowned Solitary Eagle
CCB and its partners are using GPS transmitters to investigate the habitat use, movement patterns, and causes of mortality in juvenile Crowned Eagles. The Crowned Eagle (Harpyhaliaetus coronatus) has been considered an endangered species by IUCN since 2004. The world population was estimated at less than 1000 individuals and their populations are declining. This is a large snake eagle that inhabits open woodlands in xerophytic forests of different biomes along its distribution that ranges from southern Brazil to northern Patagonia in Argentina. Human persecution is the most significant threat to the endangered Crowned Eagle in central Argentina. This is because of an incorrect local belief that the eagles prey on livestock. The tracking data is critical in understanding the interactions between local ranchers and eagles and the changing human perceptions on eagles and livestock