Mapping Ecotone Movements: Holocene Dynamics of the Forest Tension Zone in Central Lower Michigan, Usa

Hupy, Christina M.

doi:10.2747/0272-3646.33.5.473

Cited by 7 publications

(3 citation statements)

References 33 publications

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“…Key ecological changes include the ongoing westward range expansion of several tree taxa in the Great Lakes region (Davis et al 1986, Woods and Davis 1989, Booth et al 2012a, Jackson et al 2014, Wang et al 2016, population expansion for some species such as hemlock (Davis et al 1998) and white pine (Tweiten et al 2015), the establishment of mesic hardwood forests in the Big Woods of south-central Minnesota (Umbanhowar et al 2006, Hupy 2012, and southward shifts in the ecotone between northern mixed forests and temperate broadleaved forests (Hupy 2012). Key ecological changes include the ongoing westward range expansion of several tree taxa in the Great Lakes region (Davis et al 1986, Woods and Davis 1989, Booth et al 2012a, Jackson et al 2014, Wang et al 2016, population expansion for some species such as hemlock (Davis et al 1998) and white pine (Tweiten et al 2015), the establishment of mesic hardwood forests in the Big Woods of south-central Minnesota (Umbanhowar et al 2006, Hupy 2012, and southward shifts in the ecotone between northern mixed forests and temperate broadleaved forests (Hupy 2012).…”

Section: Introductionmentioning

confidence: 99%

“…The upper Midwestern United States (UMW), ranging from Minnesota to Upper Michigan, has been the focus of decades of paleoecological study and has one of the densest networks of fossil pollen data worldwide. Key ecological changes include the ongoing westward range expansion of several tree taxa in the Great Lakes region (Davis et al 1986, Woods and Davis 1989, Booth et al 2012a, Jackson et al 2014, Wang et al 2016, population expansion for some species such as hemlock (Davis et al 1998) and white pine (Tweiten et al 2015), the establishment of mesic hardwood forests in the Big Woods of south-central Minnesota (Umbanhowar et al 2006, Hupy 2012, and southward shifts in the ecotone between northern mixed forests and temperate broadleaved forests (Hupy 2012). There is also evidence for ecologically significant climatic changes in the UMW during the past 3,000 yr , Booth and Jackson 2003, Tweiten et al 2009) and shifts in fire regimes (Umbanhowar 2004).…”

Section: Introductionmentioning

confidence: 99%

“…, Shuman et al. , Hupy ), and southward shifts in the ecotone between northern mixed forests and temperate broadleaved forests (Hupy ). There is also evidence for ecologically significant climatic changes in the UMW during the past 3,000 yr (Booth et al.…”

Section: Introductionmentioning

confidence: 99%

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Quantifying trends and uncertainty in prehistoric forest composition in the upper Midwestern United States

Dawson

Paciorek

Goring

et al. 2019

Ecology

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Forest ecosystems in eastern North America have been in flux for the last several thousand years, well before Euro‐American land clearance and the 20th‐century onset of anthropogenic climate change. However, the magnitude and uncertainty of prehistoric vegetation change have been difficult to quantify because of the multiple ecological, dispersal, and sedimentary processes that govern the relationship between forest composition and fossil pollen assemblages. Here we extend STEPPS, a Bayesian hierarchical spatiotemporal pollen–vegetation model, to estimate changes in forest composition in the upper Midwestern United States from about 2,100 to 300 yr ago. Using this approach, we find evidence for large changes in the relative abundance of some species, and significant changes in community composition. However, these changes took place against a regional background of changes that were small in magnitude or not statistically significant, suggesting complexity in the spatiotemporal patterns of forest dynamics. The single largest change is the infilling of Tsuga canadensis in northern Wisconsin over the past 2,000 yr. Despite range infilling, the range limit of T. canadensis was largely stable, with modest expansion westward. The regional ecotone between temperate hardwood forests and northern mixed hardwood/conifer forests shifted southwestward by 15–20 km in Minnesota and northwestern Wisconsin. Fraxinus, Ulmus, and other mesic hardwoods expanded in the Big Woods region of southern Minnesota. The increasing density of paleoecological data networks and advances in statistical modeling approaches now enables the confident detection of subtle but significant changes in forest composition over the last 2,000 yr.

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