From there, most birds make a direct flight across the ocean to Hispaniola, and many fewer birds head to Cuba, Puerto Rico, or Jamaica. Townsend, J.T., C.T. 1995. All inquiries are welcomed.
Nagy. Decline of a New Hampshire Bicknell’s Thrush Population, 1993-2003, Identification and sex determination of Bicknell’s Thrushes using Morphometric Data, Potential effects of climate change on birds of the Northeast, A practical model of Bicknell’s Thrush distribution in the northeastern United States, Bird conservation in Haiti: it’s now or never to save Haiti’s birds, Mercury levels in Bicknell’s thrush and other insectivorous passerine birds in montane forests of the northeastern United States and Canada, Population density, vocal behavior and recommended survey methods for Bicknell’s Thrush, Distribution of Bicknell’s Thrush in New England and New York. Stable-hydrogen isotope measures of natal dispersal reflect observed population declines in a threatened migratory songbird. Bicknell’s Thrush numbers have declined across Canada according to results from the Breeding Bird Survey. Data from New Brunswick were too sparse to be included in the Breeding Bird Survey analysis. This pattern is similar to research from other animal and plant systems which finds that peripheral populations tend to become extirpated (locally extinct) first when that species is globally declining. For one, Bicknell’s Thrush and the nearly-identical looking Gray-cheeked Thrush (Catharus minimus) cannot be conclusively identified during migration, when both species temporarily and spatially overlap. Most birds begin the journey by heading west across Cuba before turning north and entering the United States in southern Florida. McFarland NORWICH, VT — New research by the Vermont Center for Ecostudies (VCE) has revealed that Bicknell’s Thrush likely have one of the smallest population sizes – about 71,000 adult birds – of any migratory songbird within the contiguous U.S. Environmental Toxicology and Chemistry 33:208-215. They include addressing the following: A complete discussion of the threats facing Bicknell’s Thrush is provided in the updated Conservation Action Plan for Bicknell’s Thrush. Thrushes and Allies(Order: Passeriformes, Family:Turdidae). Recommended actions concentrate on range-wide research, monitoring, and habitat conservation. DOI: 10.1007/s11027-007-9126-1. Second Atlas of the Breeding Birds of Vermont, 2003-2007. Plain brown thrush that usually shows very little eyering. Perhaps ski slopes superficially mimic the naturally-occurring disturbances (e.g., fir waves and short regenerating areas caused by microbursts and insect outbreaks) found in their unaltered habitat. 506-364-5047 (Canada) Tsai, and L.R. The steepest declines (see the below table) were observed in the Catskills: the southernmost portion of the global Bicknell’s Thrush range. 2001. Retrieved from http://val.vtecostudies.org. View from the Long Trail north of Bolton Mountain peak. But to understand the global state of Bicknell’s Thrush, we also need to consider data collected in Canada, which is home to a significant number of Bicknell’s Thrush. Goetz. Importantly, the plan directs foremost attention to better protection of its dwindling winter habitats.
The dark blue lines represent the mean prediction, while the numerous thin blue lines show other (less likely) relationships between the abundance of Bicknell’s Thrush around a sampling station and elevation (left panel) and percent canopy coverage (right panel).
Population density, vocal behavior and recommended survey methods for Bicknell’s Thrush. 2010. Spotted below with a brown face. According to the International Bicknell's Thrush Conservation Group, there are fewer than 125,000, which is an extremely small population for a songbird.
Journal of Caribbean Ornithology 18:86-87.
McFarland. Thank you for helping us protect the wildlife in your backyard and across the Americas. Effects of mountain resorts on wildlife. . Rimmer, C.C., K.P. In The Birds of North America, (A. Poole and F. Gill, eds.). Nesting in the dense, stunted forests of balsam fir across the high country of the northern Appalachian and Laurentian mountains, they are one of North America's rarest migratory songbirds. She then lays eggs that have been fertilized by multiple different males. email, International Bicknell's Thrush Conservation Group.
However, the second Breeding Bird Atlas of the Maritime Provinces shows recent local extinctions of some coastal populations in Nova Scotia and New Brunswick, which also supports the idea that overall numbers of Bicknell’s Thrush are dwindling. 2005. Journal of Field Ornithology 83:295-301. Rimmer, K.P. DOI: 10.1525/auk.2012.12043, Townsend, J.M., C.C. McFarland, and S. Menu. Birds connect us with the joy and wonder of nature. Bicknell’s Thrush (Catharus bicknelli) incubating a nest on Stratton, Vermont. 1995. Another interesting example of integrating conservation into sustainable development is Reserva Zorzal, a farm in the Dominican Republic. Our success depends on the generosity of friends like you. Wilson Journal of Ornithology 123:367-372. Predation of a wintering migratory songbird by introduced rats: can nocturnal roosting behavior serve as predator avoidance? 2005. Rather, the figure below suggests a gradual decline in Bicknell’s Thrush with much fluctuation in population size over multiyear periods. McFarland.
The Mountain Birdwatch sampling protocol (i.e., fixed locations surveyed every year) is not an ideal sampling methodology for this ephemeral scenario. A practical model of Bicknell’s Thrush distribution in the northeastern United States. Retrieved from http://val.vtecostudies.org. In the long run, conserving Bicknell’s Thrush will require that we address the climate change caused by our activities. Development in mountain-top breeding areas should be avoided wherever possible. Rimmer, J. Brocca, K.P. Thanks largely to a legion of Mountain Birdwatch citizen scientists, we’re able to monitor breeding populations across the northeastern U.S. and we recently release a comprehensive State of the Mountain Birds report. Photo by K.P. and K.P. If we make The Bicknell's Thrush the Official Vermont State Bird, we can help raise awareness of the plight of the species. Home; About Mercury on the Move; Tag Archives: bicknells thrush Mountain Birdwatch 2019 on Bolton Mountain. Posted on July 1, 2019 by mattbeagle. Diversity and Distributions 18: 919–930. Townsend, A. Llanes Sosa, and A. Kirkconnell. These kinds of disturbed forests might also provide nesting habitat for Bicknell’s Thrush in remote parts of Maine.
Driscoll, K.P. Expectedly, the region-wide figure below somewhat masks the trends that are occurring at the state level. Strong, A.M., C.C. Lambert, L.R. This means supporting government policies – and making individual choices – that lead to a reduction in greenhouse-gas concentrations. Rimmer. The disappearance of the species from this peak, its only known haunt in the state, was well documented by birders during the 1900s and provided one of the earliest warning signals that all might not be well. DOI: 10.1111/j.1557-9263.2008.00192.x, Rodenhouse, N.L., S.N. The U.S. population of Bicknell’s Thrush is likely around 70,000, with a global population of less than 120,000 (source: Jason Hill and John Lloyd’s 2017 Ecosphere paper). The relative contribution of local habitat and landscape context to metapopulation processes: a dynamic occupancy modeling approach. Goetz, J.E.., K. P. McFarland and C.C. Rimmer, K.P. New research by the Vermont Center for Ecostudies (VCE) has revealed that Bicknell’s Thrush likely have one of the smallest population sizes – about 71,000 adult birds – of any migratory songbird within the contiguous U.S. Rimmer, C.C. Many coastal populations appear to have vanished in recent years, however, so it is now uncommon to find the species in these locales. 2012. DATE ACCESSED. DOI: 10.1525/auk.2010.09160, Kerchner, C., M. Homzak, R. Kemkes, A. Richardson, J.M. Auk 129: 683-690.
Atwood, J.L., C.C. Lambert, J. D., K. P. McFarland, C. C. Rimmer, S. D. Faccio, and J. L. Atwood. Individuals may take several weeks to complete this part of their journey. Journal of Field Ornithology 77: 452-454. We’ve discovered surprisingly high burdens of toxic mercury from atmospheric pollution in the blood and feathers of every thrush sampled from Canada and the Catskills to its wintering grounds in Cuba and Hispaniola. The group’s overall charge is to develop and implement a Conservation Action Plan for Bicknell’s Thrush, which was finalized and released in July 2010. Renfrew, R. 2013. Townsend, J.M. A new study led by VCE biologist Kent McFarland and published in The Condor: Ornithological Applications employed statistical modeling methods to identify remaining key habitat for females in fragmented, wet, montane forests of the Dominican Republic. 2014. Nests in stunted evergreen forests on mountaintops. Vermont Center for Ecostudies – Vermont Atlas of Life.
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