Climate change and the origin of migratory pathways in the Swainson's thrush, <i>Catharus ustulatus</i>. Ruegg, K. C., Hijmans, R. J., & Moritz, C. Journal of Biogeography, 33(7):1172–1182, 2006. ![Climate change and the origin of migratory pathways in the Swainson's thrush, <i>Catharus ustulatus</i> [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Aim�To provide a spatially explicit model of how geographic distributions at the last glacial maximum (LGM) and post-glacial colonization routes shaped current migratory pathways in the Swainson's thrush, Catharus ustulatus, a long-distance migratory bird.Location� The Swainson's thrush breeds in boreal forest regions of the United States and Canada as well as in riparian woodlands along the Pacific coast of North America.Methods� Palaeodistribution modelling is combined with mtDNA phylogeography to predict the breeding range of the Swainson's thrush at the LGM. Quantitative environmental analysis and bioclimatic modelling are used to reconstruct the most likely post-glacial colonization pathways. A maximum likelihood method for estimating growth rates is used to approximate the relative change in population size since the LGM.Main conclusions� The palaeodistribution models are concordant with the Swainson's thrush mtDNA phylogeography, suggesting that the inland and coastal groups were geographically isolated in eastern (inland) and western (coastal) regions at the LGM. Estimates of change in population size based on genetic data are remarkably consistent with estimates of change in range size, suggesting that the coastal group has undergone a 2- to 3-fold demographic and range expansion, while the inland group has undergone a 6- to 12-fold demographic and range expansion since the LGM. Bioclimatic analyses strongly support the hypothesis that populations expanding out of the east into previously glaciated areas in the west were undergoing a natural extension of their range by tracking the changes in climatic conditions. The combination of bioclimatic and molecular analyses is consistent with the idea that coastal and inland groups expanded from separate eastern and western regions after the LGM and that the current migratory pathway of the inland group retraces its post-glacial colonization route.
@article{ruegg_climate_2006,
title = {Climate change and the origin of migratory pathways in the {Swainson}'s thrush, \textit{{Catharus} ustulatus}},
volume = {33},
url = {http://dx.doi.org/10.1111/j.1365-2699.2006.01517.x},
doi = {10.1111/j.1365-2699.2006.01517.x},
abstract = {Aim�To provide a spatially explicit model of how geographic distributions at the last glacial maximum (LGM) and post-glacial colonization routes shaped current migratory pathways in the Swainson's thrush, Catharus ustulatus, a long-distance migratory bird.Location� The Swainson's thrush breeds in boreal forest regions of the United States and Canada as well as in riparian woodlands along the Pacific coast of North America.Methods� Palaeodistribution modelling is combined with mtDNA phylogeography to predict the breeding range of the Swainson's thrush at the LGM. Quantitative environmental analysis and bioclimatic modelling are used to reconstruct the most likely post-glacial colonization pathways. A maximum likelihood method for estimating growth rates is used to approximate the relative change in population size since the LGM.Main conclusions� The palaeodistribution models are concordant with the Swainson's thrush mtDNA phylogeography, suggesting that the inland and coastal groups were geographically isolated in eastern (inland) and western (coastal) regions at the LGM. Estimates of change in population size based on genetic data are remarkably consistent with estimates of change in range size, suggesting that the coastal group has undergone a 2- to 3-fold demographic and range expansion, while the inland group has undergone a 6- to 12-fold demographic and range expansion since the LGM. Bioclimatic analyses strongly support the hypothesis that populations expanding out of the east into previously glaciated areas in the west were undergoing a natural extension of their range by tracking the changes in climatic conditions. The combination of bioclimatic and molecular analyses is consistent with the idea that coastal and inland groups expanded from separate eastern and western regions after the LGM and that the current migratory pathway of the inland group retraces its post-glacial colonization route.},
number = {7},
urldate = {2009-02-19TZ},
journal = {Journal of Biogeography},
author = {Ruegg, Kristen C. and Hijmans, Robert J. and Moritz, Craig},
year = {2006},
keywords = {Climate Change, Paleoclimate, Species Distribution Modeling, Swainson's Thrush, ecological niche modeling},
pages = {1172--1182}
}
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Quantitative environmental analysis and bioclimatic modelling are used to reconstruct the most likely post-glacial colonization pathways. A maximum likelihood method for estimating growth rates is used to approximate the relative change in population size since the LGM.Main conclusions� The palaeodistribution models are concordant with the Swainson's thrush mtDNA phylogeography, suggesting that the inland and coastal groups were geographically isolated in eastern (inland) and western (coastal) regions at the LGM. Estimates of change in population size based on genetic data are remarkably consistent with estimates of change in range size, suggesting that the coastal group has undergone a 2- to 3-fold demographic and range expansion, while the inland group has undergone a 6- to 12-fold demographic and range expansion since the LGM. Bioclimatic analyses strongly support the hypothesis that populations expanding out of the east into previously glaciated areas in the west were undergoing a natural extension of their range by tracking the changes in climatic conditions. 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