For in depth results and interpretation, please see the individual species accounts at our State of Mountain Birds report website (updated in 2020).
With nearly two decades of robust monitoring data, Mountain Birdwatch is helping biologists, land managers, and policy makers make sound bird conservation decisions. Mountain Birdwatch data have been used to analyze how climate change will impact high-elevation bird populations, establish protective management zones in the Green Mountain and White Mountain National Forests, and appropriately site radio towers, wind turbines, and ski trails so as to minimize disturbance to songbirds. We recently published the first fine-scale population estimate for Bicknell’s Thrush–entirely from Mountain Birdwatch data. The resulting article in Ecosphere can be read online for free, and you can interact with or download our online abundance map.
Each year we analyze Mountain Birdwatch data using sophisticated statistical models to estimate the annual population trends of the bird species that we monitor. These results are available through our continuously updated State of Mountain Birds report, where we assess the health of all mountain forest songbird populations monitored by Mountain Birdwatch. Although species like Black-capped Chickadee have thrived in the mountains during recent decades, some species that depend on the region’s evergreen forests of spruce and fir – notably Blackpoll Warbler – appear to have undergone substantial declines.
We’re continually analyzing these data to help us in understanding how songbird populations are changing in our mountains. We welcome data requests and requests for collaboration. The following data are available as open data:
- Vermont Center for Ecostudies. Mountain Birdwatch 2.0: 2010-2018. KNB Data Repository. 10.5063/F1XW4H49.
- Vermont Center for Ecostudies, J. D. Lambert, and J. Hart. 2015. Mountain Birdwatch 1.0: 2000-2010. KNB Data Repository. doi:10.5063/F1DN430G
SELECTED REPORTS & PUBLICATIONS
- Lloyd, J, JM Hill, & KP McFarland. 2017. The State of Mountain Birds: 2017. https://mountainbirds.vtecostudies.org/
- Hill, JM & JD Lloyd. 2017. A fine-scale U.S. population estimate of a montane spruce–fir bird species of conservation concern. Ecosphere 8: 14 pp.
- Ralston, J, DI King, WV DeLuca, GJ Niemi, MJ Glennon, JC Scarl, & JD Lambert. 2015. Analysis of combined data sets yields trend estimates for vulnerable spruce‐fir birds in northern United States. Biological Conservation 187:270–278.
- Frey, SJK, AM Strong, & KP McFarland. 2011. The relative contribution of local habitat and landscape context to metapopulation processes: a dynamic occupancy modeling approach. Ecography 34:1-9.
- Rodenhouse, NL, SN Matthews, KP McFarland, JD Lambert, LR Iverson, A Prasad, TS Sillett, & RT Holmes. 2008. Potential effects of climate change on birds of the Northeast. Mitigation and Adaptation Strategies for Global Change 13:517-540.
- Lambert, JD, DI King, JP Buonaccorsi & LS Prout. 2008. Decline of a New Hampshire Bicknell’s Thrush Population, 1993-2003. Northeastern Naturalist 15:607-618.
- King, D, JD Lambert, JP Buonaccorsi, & LS Prout. 2007. Avian population trends in the vulnerable montane forests of the Northern Appalachians, USA. Biodiversity and Conservation 17:2691-2700.
- Lambert, JD, KP McFarland, CC Rimmer, SD Faccio, & JL Atwood. 2005. A practical model of Bicknell’s Thrush distribution in the northeastern United States. Wilson Bulletin 117:1-11.