Western Purple Martin

The unique western subspecies of Purple Martin is of conservation concern, roughly estimated at just 3,500 pairs. There is little known about the Western Purple Martins compared to the more abundant eastern subspecies (Rockwell 2019). Previous studies using light-level geolocators have revealed that Eastern Purple Martins largely overwinter in the heavily forested Brazilian Amazon. Still, Western Purple Martins appear to use a different overwintering area in southeastern Brazil, which may be more impacted by agriculture (Fraser et al. 2012). However, these data come from only a small number of individuals breeding in British Columbia that may not represent the entire subspecies. It is unknown whether other western populations, including martins that nest in Oregon, follow the same pattern.
Further, light-level geolocator data have a larger margin of error and are not precise enough to identify specific roosting sites that may need protection (McKinnon and Love 2018). Archival GPS tags provide unprecedented precision in determining these locations. We are using this technology to track migratory routes and overwintering sites used by Western Purple Martins and identify potential conservation opportunities in the non-breeding season. A better understanding of overwintering locations and migratory stopover sites used by Western Purple Martins, as potential threats originating on the non-breeding grounds have been identified in a recent ISSSSP Conservation Assessment as key information gaps needed to target conservation actions (Rockwell 2019).
From 2020-2022, a small team of researchers from KBO, USFS, and USGS captured adult Western Purple Martins breeding in coastal Oregon at night while they roost in their nestboxes. We have captured martins on the Siuslaw National Forest and McKenzie River Trust lands. We band the birds and outfit them with lightweight archival GPS tags that fit like a backpack with two leg loops to track their movements. There’s just one catch – to have a battery small and lightweight enough for a small songbird to carry, the tags cannot transmit data, only store it. Returning tagged birds must be recaptured following a year-long round-trip migration to retrieve the tag and its precious geospatial data. Due to these challenges, most tracking studies of this type have relatively small sample sizes; nevertheless, they have revolutionized our understanding of bird migration. Precise data on the winter whereabouts of a few Western Purple Martin individuals are enormously important compared to the absence of any precise data that we had before this study. Our objectives are to find locations of roost sites used during migration and winter and use this information to identify conservation partners and actions that can be taken during the non-breeding season.
Our first recaptured martin flew almost 7,000 miles to southeastern Brazil and then back again! KBO has joined the International Purple Martin Working Group, which focuses mostly on Eastern Purple Martins, to include our western subspecies in research and conservation activities with partners in more tropical locales. Stay tuned!
This work is supported by the U.S. Forest Service, Purple Martin Conservation Association, and U.S. Geological Survey. Photos provided by Lorelle Sherman.



References
Fraser, K. C., B. J. M. Stutchbury, C. Silverio, P. M. Kramer, J. Barrow, D. Newstead, N. Mickle, B. F. Cousens, J. C. Lee, D. M. Morrison, T. Shaheen, et al. 2012. Continent-wide tracking to determine migratory connectivity and tropical habitat associations of a declining aerial insectivore. Proceedings of the Royal Society B: Biological Sciences 279:4901–4906.
McKinnon, E. A. and O. P. Love. 2018. Ten years tracking the migrations of small landbirds: Lessons learned in the golden age of bio-logging. The Auk 135:834-856.
Rockwell, S. M. 2019. Conservation Assessment for Purple Martin (Progne subis). Interagency Special Status/Sensitive Species Program Conservation Assessments. USDA Forest Service Region 6 and USDI Bureau of Land Management, Oregon and Washington, 73 p.


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BIOLOGIST Nora contributes to KBO’s Informatics and Avian Data Science Program. In this role, she provides support for the Avian Knowledge Network, works with partners to scope and develop data-driven decision support tools, and is involved in data analysis, reporting, and publications.



Long-term trends of waterfowl show strong increases where investments in wetland conservation have improved conditions for birds and people. However, we are not seeing the same trends here in the Pacific Northwest. For the first time in their history, Lower Klamath and Tule Lake National Wildlife Refuges will be dry in fall 2022. In California’s Central Valley, limited water supplies forced a 60% reduction in rice in rice acreage in 2022, which traditionally provides crucial habitat for over 5 million wintering ducks. In these regions, the effects of drought are exacerbated by rigid local water laws and the over-allocation of limited water supplies that restrict sufficient water availability for waterfowl and waterbird habitats. Policies that create efficient water-sharing solutions are desperately needed if waterfowl and waterbird populations are to recover from drastic declines in the American West.


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Renata Miwa is the artist of this year’s Conservation Science Stamp. She is a Brazilian Illustrator and Senior Designer based in São Paulo / Brazil and has been working in the field of editorial design and advertising for almost 10 years now with clients such as McDonalds, Unilever, TED, etc. She is a volunteer designer at Mantiquera Bird Observatory (OAMa) and helps coordinate the design of printed materials. donates her illustration to be sold in their store, and votes in the referendum. Renata’s work is inspired by urban elements, colors, and graphic novels. In her spare time she loves to cook, bird watch, take care of my garden and chat with my friends.
James Hautman, in 1989, at the age of 25, Jim became the youngest artist in history to win the prestigious Federal Duck Stamp Contest. In 1994 he not only took first prize but he set a new record by receiving a perfect judges score as well as the distinguished People’s Choice Award. Jim has gone on to capture top honors in the Federal contest in 1998, 2010, 2016, and in 2021. You can visit the Hautman brother’s website to see more of their art