Late Quaternary vegetation of the Aleutian Islands, southwestern Alaska
Late Quaternary vegetational history of the Aleutian Islands is interpreted from fossil pollen and spore stratigraphy and radiocarbon chronology of sections of mires on the islands of Attu, Adak, Atka, and Umnak. Mires postdate the withdrawal of ice-age glaciers between approximately 12 000 and 10 0...
Published in: | Canadian Journal of Botany |
---|---|
Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
1990
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/b90-168 http://www.nrcresearchpress.com/doi/pdf/10.1139/b90-168 |
id |
crcansciencepubl:10.1139/b90-168 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/b90-168 2023-12-17T10:27:29+01:00 Late Quaternary vegetation of the Aleutian Islands, southwestern Alaska Heusser, Calvin J. 1990 http://dx.doi.org/10.1139/b90-168 http://www.nrcresearchpress.com/doi/pdf/10.1139/b90-168 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Botany volume 68, issue 6, page 1320-1326 ISSN 0008-4026 Plant Science journal-article 1990 crcansciencepubl https://doi.org/10.1139/b90-168 2023-11-19T13:38:41Z Late Quaternary vegetational history of the Aleutian Islands is interpreted from fossil pollen and spore stratigraphy and radiocarbon chronology of sections of mires on the islands of Attu, Adak, Atka, and Umnak. Mires postdate the withdrawal of ice-age glaciers between approximately 12 000 and 10 000 years ago with the exception of the mire on Attu Island, where deglaciation apparently began as late as 7000 years ago. No uniform pattern of change in Pacific coastal tundra communities is evident in the fossil assemblages. Pollen assemblages, consisting variably of Gramineae, Cyperaceae, Empetrum, Umbelliferae, Salix, Ranunculaceae, Compositae, Polypodiaceae, and Lycopodium, reflect conditions in effect in different sectors of the Aleutian chain. Climate, soil, topography, volcanism, and seismic activity are noteworthy parameters influencing vegetation composition and distribution. Volcanism has been of major importance, as shown by thickness, distribution, and frequency of tephra layers that number 5 on Attu, 24 on Adak, 17 on Atka, and 5 on Umnak. A repeated condition of patch dynamics, created in the main by recurrent volcanic eruptions with widespread accompanying ashfalls, has apparently overprinted the effects of climatic change. Key words: Aleutian Islands, Quaternary, vegetation, fossil pollen, volcanism. Article in Journal/Newspaper Attu glaciers Tundra Alaska Aleutian Islands Canadian Science Publishing (via Crossref) Pacific Atka ENVELOPE(151.789,151.789,60.835,60.835) Adak ENVELOPE(59.561,59.561,66.502,66.502) Attu Island ENVELOPE(172.909,172.909,52.903,52.903) Canadian Journal of Botany 68 6 1320 1326 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Plant Science |
spellingShingle |
Plant Science Heusser, Calvin J. Late Quaternary vegetation of the Aleutian Islands, southwestern Alaska |
topic_facet |
Plant Science |
description |
Late Quaternary vegetational history of the Aleutian Islands is interpreted from fossil pollen and spore stratigraphy and radiocarbon chronology of sections of mires on the islands of Attu, Adak, Atka, and Umnak. Mires postdate the withdrawal of ice-age glaciers between approximately 12 000 and 10 000 years ago with the exception of the mire on Attu Island, where deglaciation apparently began as late as 7000 years ago. No uniform pattern of change in Pacific coastal tundra communities is evident in the fossil assemblages. Pollen assemblages, consisting variably of Gramineae, Cyperaceae, Empetrum, Umbelliferae, Salix, Ranunculaceae, Compositae, Polypodiaceae, and Lycopodium, reflect conditions in effect in different sectors of the Aleutian chain. Climate, soil, topography, volcanism, and seismic activity are noteworthy parameters influencing vegetation composition and distribution. Volcanism has been of major importance, as shown by thickness, distribution, and frequency of tephra layers that number 5 on Attu, 24 on Adak, 17 on Atka, and 5 on Umnak. A repeated condition of patch dynamics, created in the main by recurrent volcanic eruptions with widespread accompanying ashfalls, has apparently overprinted the effects of climatic change. Key words: Aleutian Islands, Quaternary, vegetation, fossil pollen, volcanism. |
format |
Article in Journal/Newspaper |
author |
Heusser, Calvin J. |
author_facet |
Heusser, Calvin J. |
author_sort |
Heusser, Calvin J. |
title |
Late Quaternary vegetation of the Aleutian Islands, southwestern Alaska |
title_short |
Late Quaternary vegetation of the Aleutian Islands, southwestern Alaska |
title_full |
Late Quaternary vegetation of the Aleutian Islands, southwestern Alaska |
title_fullStr |
Late Quaternary vegetation of the Aleutian Islands, southwestern Alaska |
title_full_unstemmed |
Late Quaternary vegetation of the Aleutian Islands, southwestern Alaska |
title_sort |
late quaternary vegetation of the aleutian islands, southwestern alaska |
publisher |
Canadian Science Publishing |
publishDate |
1990 |
url |
http://dx.doi.org/10.1139/b90-168 http://www.nrcresearchpress.com/doi/pdf/10.1139/b90-168 |
long_lat |
ENVELOPE(151.789,151.789,60.835,60.835) ENVELOPE(59.561,59.561,66.502,66.502) ENVELOPE(172.909,172.909,52.903,52.903) |
geographic |
Pacific Atka Adak Attu Island |
geographic_facet |
Pacific Atka Adak Attu Island |
genre |
Attu glaciers Tundra Alaska Aleutian Islands |
genre_facet |
Attu glaciers Tundra Alaska Aleutian Islands |
op_source |
Canadian Journal of Botany volume 68, issue 6, page 1320-1326 ISSN 0008-4026 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/b90-168 |
container_title |
Canadian Journal of Botany |
container_volume |
68 |
container_issue |
6 |
container_start_page |
1320 |
op_container_end_page |
1326 |
_version_ |
1785579357643735040 |