By Mic McCarty, Director and Field Trip Leader
Would you like to check out the abundance of your favorite birds? Know where and when they migrate? Are their populations increasing or decreasing? You can find the answers to these questions and more at Cornell’s eBird site, Trends in Bird Abundance.
There are four features revealed by buttons on the page: abundance, weekly, trends and range.
Abundance button: Relative abundance is depicted for each season along a color gradient from a light color showing lower abundance to a dark color showing a higher abundance. The map shows blue dots for increasing their populations and red for decreasing. The darker the color, the greater the change. The Chimney Swift is decreasing in all its range. In Hillsborough they are down 13%. (See Chimney Swift trend map, right).
Weekly Button: Used for migratory birds. The weekly button is a map showing abundance by time of year. You can view each of the four weeks in each month.
Trends button. The trends map shows whether a species of bird trend is increasing, not changing or decreasing. One example of trends can be seen in the Northern Bobwhite. The trend is down 19% in nearly all of its range.
Range button: The range map depicts the boundary of the species' range. The map offers five season options: Year-round, Breeding Season, Non-breeding Season, Pre-breeding Migratory Season, and Post-breeding Migratory Season. One example of the fine detail available can be seen in the range map of the Wood Thrush. Zoom in, and you can see that the migration range includes the Florida Gulf coast, but not interior areas like Hillsborough County. If you want to see a migrating Wood Thrush, go to the coast during migration! [See Wood Thrush Range, above].
For an informed discussion of the bird population trends, view the Birds of the World YouTube video, BOW Webinar: Estimating Abundance and Trends for the World’s Birds using eBird data with Tom Auer.
Citation for images and information.
Cornell Lab of Ornithology (2024, January 1). EBird Status and Trends. Retrieved August 12, 2024, from https://science.ebird.org/en/status-and-trends
YouTube Citation:
Auer, T. (n.d.). BOW Webinar: Estimating Abundance and Trends for the World’s Birds using eBird data with Tom Auer. YouTube. Retrieved August 12, 2024, from https://www.youtube.com/watch?v=VKh9L6hjdlM&list=PLgSpqOFj1Ta7bnCNBAlWcN76UbnLthyO1&index=9
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