The Pleistocene biogeography of eastern North America: A nonmigration scenario for deciduous forest
The current reconstruction of the vegetation of eastern North America at the last glacial maximum postulates a very wide zone of tundra and boreal forest south of the ice. This reconstruction requires that the deciduous forest retreated far to the south. The authors believe that this reconstruction...
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ftosti:oai:osti.gov:564104 2023-07-30T04:07:20+02:00 The Pleistocene biogeography of eastern North America: A nonmigration scenario for deciduous forest Loehle, C. Iltis, H. 2014-10-10 application/pdf http://www.osti.gov/servlets/purl/564104 https://www.osti.gov/biblio/564104 https://doi.org/10.2172/564104 unknown http://www.osti.gov/servlets/purl/564104 https://www.osti.gov/biblio/564104 https://doi.org/10.2172/564104 doi:10.2172/564104 54 ENVIRONMENTAL SCIENCES FORESTS CLIMATIC CHANGE NORTH AMERICA TERRESTRIAL ECOSYSTEMS NUMERICAL DATA POPULATION DYNAMICS ENVIRONMENTAL IMPACTS PLEISTOCENE EPOCH 2014 ftosti https://doi.org/10.2172/564104 2023-07-11T08:35:01Z The current reconstruction of the vegetation of eastern North America at the last glacial maximum postulates a very wide zone of tundra and boreal forest south of the ice. This reconstruction requires that the deciduous forest retreated far to the south. The authors believe that this reconstruction is seriously in error. Geologic evidence for glacial activity or tundra is absent from the southern Appalachians. Positive evidence for boreal forest is based on pollen identifications for Picea, Betula, and Pinus, when in reality southern members of these genera have pollen that cannot be distinguished from that of northern members. Further, pollen of typical southern species such as oaks and hickories occurs throughout profiles that past authors had labeled boreal. Pollen evidence for a far southern deciduous forest refuge is lacking. Data on endemics are particularly challenging for the scenario in which deciduous forest migrated to the south and back. The southern Appalachian region is rife with endemics that are often extreme-habitat specialists unable to migrate. The previously glaciated zone is almost completely lacking in endemics. Outlier populations, range boundaries, and absence of certain hybrids all argue against a large boreal zone. The new reconstruction postulates a cold zone no more than 75--100 miles wide south of the ice in the East. Other/Unknown Material Tundra SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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Open Polar |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
54 ENVIRONMENTAL SCIENCES FORESTS CLIMATIC CHANGE NORTH AMERICA TERRESTRIAL ECOSYSTEMS NUMERICAL DATA POPULATION DYNAMICS ENVIRONMENTAL IMPACTS PLEISTOCENE EPOCH |
spellingShingle |
54 ENVIRONMENTAL SCIENCES FORESTS CLIMATIC CHANGE NORTH AMERICA TERRESTRIAL ECOSYSTEMS NUMERICAL DATA POPULATION DYNAMICS ENVIRONMENTAL IMPACTS PLEISTOCENE EPOCH Loehle, C. Iltis, H. The Pleistocene biogeography of eastern North America: A nonmigration scenario for deciduous forest |
topic_facet |
54 ENVIRONMENTAL SCIENCES FORESTS CLIMATIC CHANGE NORTH AMERICA TERRESTRIAL ECOSYSTEMS NUMERICAL DATA POPULATION DYNAMICS ENVIRONMENTAL IMPACTS PLEISTOCENE EPOCH |
description |
The current reconstruction of the vegetation of eastern North America at the last glacial maximum postulates a very wide zone of tundra and boreal forest south of the ice. This reconstruction requires that the deciduous forest retreated far to the south. The authors believe that this reconstruction is seriously in error. Geologic evidence for glacial activity or tundra is absent from the southern Appalachians. Positive evidence for boreal forest is based on pollen identifications for Picea, Betula, and Pinus, when in reality southern members of these genera have pollen that cannot be distinguished from that of northern members. Further, pollen of typical southern species such as oaks and hickories occurs throughout profiles that past authors had labeled boreal. Pollen evidence for a far southern deciduous forest refuge is lacking. Data on endemics are particularly challenging for the scenario in which deciduous forest migrated to the south and back. The southern Appalachian region is rife with endemics that are often extreme-habitat specialists unable to migrate. The previously glaciated zone is almost completely lacking in endemics. Outlier populations, range boundaries, and absence of certain hybrids all argue against a large boreal zone. The new reconstruction postulates a cold zone no more than 75--100 miles wide south of the ice in the East. |
author |
Loehle, C. Iltis, H. |
author_facet |
Loehle, C. Iltis, H. |
author_sort |
Loehle, C. |
title |
The Pleistocene biogeography of eastern North America: A nonmigration scenario for deciduous forest |
title_short |
The Pleistocene biogeography of eastern North America: A nonmigration scenario for deciduous forest |
title_full |
The Pleistocene biogeography of eastern North America: A nonmigration scenario for deciduous forest |
title_fullStr |
The Pleistocene biogeography of eastern North America: A nonmigration scenario for deciduous forest |
title_full_unstemmed |
The Pleistocene biogeography of eastern North America: A nonmigration scenario for deciduous forest |
title_sort |
pleistocene biogeography of eastern north america: a nonmigration scenario for deciduous forest |
publishDate |
2014 |
url |
http://www.osti.gov/servlets/purl/564104 https://www.osti.gov/biblio/564104 https://doi.org/10.2172/564104 |
genre |
Tundra |
genre_facet |
Tundra |
op_relation |
http://www.osti.gov/servlets/purl/564104 https://www.osti.gov/biblio/564104 https://doi.org/10.2172/564104 doi:10.2172/564104 |
op_doi |
https://doi.org/10.2172/564104 |
_version_ |
1772820589376962560 |