WPBO’s Research: Counts and Banding
Annual Waterbird Counts
WPBO’s research aims to document avian migration at Whitefish Point. The Point is one of most important spots for documenting and monitoring waterbird movements in the upper Great Lakes. Spring and fall counts record loons, grebes, ducks, geese, shorebirds and other waterbirds, providing important information on abundance and timing of migration, aiding in regional and international efforts to monitor changes in bird populations.
The waterbird count is conducted from the beach near the tip of the Point. Counting waterbirds is rather straightforward compared to counting other birds, as waterbirds tend to migrate directly, and aside from a few exceptions, rarely linger. Most birds typically migrate from southeast to northwest in spring and the opposite direction in fall. Therefore, any birds seen migrating in the appropriate direction are counted. Individuals are not subtracted from the count if migrating in the wrong direction.
The goal of the census is to quantify the chronology and volume of migrating waterbirds in the Whitefish Point Migratory Corridor. Interpreting the waterbird data, like all bird censuses, must be done in the long term. Unlike the hawk count, in which weather can have tremendous effect on the ability of the birds to reach the Point, visibility is the prime concern during waterbird counts. Some of the most inclement days have had some of the highest numbers of migrating waterbirds, but if it is foggy the ability to detect the passing migrants can be challenging.
Annual Raptor Counts
Whitefish Point is one of the most important spring flight corridors for raptors in North America. The hawk count documents the migration of hawks, eagles and falcons and provides reliable comparative data for long-term monitoring of raptor populations. The goal of this long-term census is to determine the migration chronology of raptors at the Point and to quantify the volume of migrants. All observations are made from the “Hawk Dune” about 200 meters west of the Whitefish Lighthouse and about 20 meters above Lake Superior. For purposes of the count, migrating raptors are divided into two categories: passing species that actively migrate through the Point area; and kettling species that congregate and linger at the Point. The WPBO hawk count has been actively gathering migration data for over 20 years. We are partnered with the Hawk Migration Assoc. of America website (HMANA) where you can view the numbers of hawks seen each day during migration.
Annual Owl Banding
Currently, owl banding takes place three times a year. Spring owl banding starts March 15 and runs through the end of May. Fall owl banding runs from September 15 to October 31. Summer owl banding is the newest part of the project, and began in 2006 to specifically track post-fledgling Northern Saw-whet Owls (July 1 to mid-August).
Briefly, our owl banding efforts at WPBO (all done in accordance with Federal and State permits) are both meaningful and unusual. After night capture with mist nets, our highly-trained and experienced staff works to gather information such as weight, tail and wing measurements from the owls, and they then ring a numbered lightweight USFWS aluminum band around the bird’s ankle. These data help determine age, sex, and body condition of the bird, and all the data are then sent to the National Bird Banding Lab in Maryland. These data, along with other data stored in the BBL repository, help biologists and wildlife managers understand more about owl movements and demographics.
The aim of this research is to monitor owl populations over time, and to gain a better understanding of how these populations fluctuate and change over the years. As is common at owl banding sites across North America, most of the owls captured at WPBO are Northern Saw-Whet Owls. However, our efforts have documented a total of nine (9) species of owl at The Point. Along with Northern Saw-Whet Owls, we have banded Boreal, Long-eared, Short-eared, Great Horned, Great Gray, Barred, Snowy and Northern Hawk Owls – an impressive diversity of owls that is largely unparalleled at any other banding site in North America. Also unique to WPBO, we are the only site to maintain a summer Northern Saw-Whet Owl banding program, which is providing unique insights into the demographics and movements of juvenile birds.
To learn more about the history of this special project, visit the history page.