Songbird Monitoring at Indiana Dunes, 2014-2018

Location of Indiana Dune route 35901 of the North American Breeding Bird Survey. Inset: locations of all North American Breeding Bird Survey routes. Map by Eastern Ecological Science Center
www.usgs.gov/media/images/bbs-routes-across-north-america

The North American Breeding Bird Survey (BBS) began in 1966 in response to concerns raised by Rachel Carson in her book Silent Spring (published four years earlier) regarding the overuse of pesticides. Carson’s emphasis on the effects DDT had on birds led Dr. Chandler Robbins at the U.S. Geological Survey (USGS) to begin the long-term songbird monitoring program.

The National Park Service is not a formal partner in this large-scale effort, but Indiana Dunes National Park has participated in the surveys since 1993. The route known as “Indiana Dune (35901)” is one of more than 4,100 survey routes across the continental U.S. and Canada (www.pwrc.usgs.gov/bbs/about/). NPS and USGS staff and volunteers have worked together over the past 28 years to document 121 species during these annual surveys.

Eleven most common species recorded during bird surveys at Indiana Dunes, 2014–2018. Left to right from top: American Robin, Yellow Warbler, Red-winged Blackbird, Northern Cardinal, Song Sparrow, Common Yellowthroat, Brown-headed Cowbird, Gray Catbird, Red-eyed Vireo, Eastern Towhee, and House Wren. NPS photos

2014–2018

The 50 point-count stations in Indiana Dunes National Park were visited once a year in 2014 through 2018, following the North American Breeding Bird Survey protocol. All but three points were completed across the five years, resulting in a total of 247 completed counts.

A total of 85 unique species were detected during these counts, with an average of 58 species over the five-year period. Eleven species accounted for 50% of all the birds detected during the five-year period.

What Will the Future Sound Like?

One study comparing bird population changes under two different climate scenarios predicted high turnover of species populations at Indiana Dunes by mid-century (2041–2070) if the nation continues on its current path of rising emissions1. Some species, like the American Robin, have a mixed outlook; they are predicted to do better in winter than in summer. Others such as the Yellow Warbler and Song Sparrow are predicted to disappear from the area during the summer nesting season (though the Song Sparrow may become more common in winter). Red-winged Blackbirds, while seemingly unaffected during the summer breeding season, are predicted to become more common in the area during the winter. Interestingly, three species that were only observed once during the 2014–2018 surveys are predicted to increase in numbers: the Dickcissel (observed in 2014), the Prothonotary Warbler (2014), and the White-eyed Vireo (2018).

The forests, savannas, and wetlands at Indiana Dunes will still ring with bird song, perhaps from some species more than ever before.

More on climate change and birds in the national parks

1 Wu, J.X., C.B. Wilsey, L. Taylor, and G.W. Schuurman. 2018. Projected avifaunal responses to climate change across the U.S. National Park System. PLoS ONE 13(3): e0190557.

https://doi.org/10.1371/journal.pone.0190557

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For more information on songbird monitoring in the Great Lakes Network parks

Great Lakes Inventory and Monitoring Network Landbird Monitoring page: www.nps.gov/im/glkn/landbirds.htm.

Read the full report: Roberts, S.G., Z.S. Ladin, E.L. Tymkiw, W.G. Shriver, and T. Gostomski. 2021. Songbird monitoring in the Great Lakes Network parks: 2014–2018. Natural Resource Report NPS/GLKN/NRR—2021/2217. National Park Service, Fort Collins, Colorado. https://doi.org/10.36967/nrr-2283974.

**Download a PDF of this article: **https://irma.nps.gov/DataStore/Reference/Profile/2293411

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