Late glacial impacts on dispersal and colonization of Atlantic Canada and Maine by freshwater fishes
Abstract Late glacial scenarios of ice retreat and biogeography databases constrain the dispersal routes of obligate freshwater fishes into Atlantic Canada and Maine. Evidence indicates glacial ice covered the present-day mainland and offshore islands at 18,000 14 C yr before present. Possible refug...
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crcambridgeupr:10.1016/j.yqres.2006.11.002 2024-09-30T14:33:18+00:00 Late glacial impacts on dispersal and colonization of Atlantic Canada and Maine by freshwater fishes Allen Curry, R. 2007 http://dx.doi.org/10.1016/j.yqres.2006.11.002 http://api.elsevier.com/content/article/PII:S0033589406001530?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589406001530?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400004907 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 67, issue 2, page 225-233 ISSN 0033-5894 1096-0287 journal-article 2007 crcambridgeupr https://doi.org/10.1016/j.yqres.2006.11.002 2024-09-04T04:01:50Z Abstract Late glacial scenarios of ice retreat and biogeography databases constrain the dispersal routes of obligate freshwater fishes into Atlantic Canada and Maine. Evidence indicates glacial ice covered the present-day mainland and offshore islands at 18,000 14 C yr before present. Possible refugia for extirpated freshwater fishes were the exposed outer edge of the Grand Banks (east), exposed Georges Bank (south-Atlantic Refugium), and the Mississippi Refugium in the west. It is improbable that the region was recolonized from the offshore refugia. Rather, fishes recolonized from the east via the upper St. Lawrence River valley into the upper Saint John River, Maine (Lake Madawaska) from 11,000 to 12,000 14 C yr BP. The short period of entry resulted in the low diversity of obligate freshwater species in the region. Lake Madawaska was breached and dispersal continued into the remainder of the region after 8000 14 C yr BP. By 6000 14 C yr BP, access routes to the east along low-lying coastal zones were blocked by rising sea levels, which isolated Prince Edward Island, Cape Breton Island, and most probably Nova Scotia. Natural dispersal across the region appeared complete by this time. Article in Journal/Newspaper Breton Island Prince Edward Island Cambridge University Press Breton Island ENVELOPE(141.383,141.383,-66.800,-66.800) Canada Lawrence River ENVELOPE(-115.002,-115.002,58.384,58.384) Quaternary Research 67 2 225 233 |
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Cambridge University Press |
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language |
English |
description |
Abstract Late glacial scenarios of ice retreat and biogeography databases constrain the dispersal routes of obligate freshwater fishes into Atlantic Canada and Maine. Evidence indicates glacial ice covered the present-day mainland and offshore islands at 18,000 14 C yr before present. Possible refugia for extirpated freshwater fishes were the exposed outer edge of the Grand Banks (east), exposed Georges Bank (south-Atlantic Refugium), and the Mississippi Refugium in the west. It is improbable that the region was recolonized from the offshore refugia. Rather, fishes recolonized from the east via the upper St. Lawrence River valley into the upper Saint John River, Maine (Lake Madawaska) from 11,000 to 12,000 14 C yr BP. The short period of entry resulted in the low diversity of obligate freshwater species in the region. Lake Madawaska was breached and dispersal continued into the remainder of the region after 8000 14 C yr BP. By 6000 14 C yr BP, access routes to the east along low-lying coastal zones were blocked by rising sea levels, which isolated Prince Edward Island, Cape Breton Island, and most probably Nova Scotia. Natural dispersal across the region appeared complete by this time. |
format |
Article in Journal/Newspaper |
author |
Allen Curry, R. |
spellingShingle |
Allen Curry, R. Late glacial impacts on dispersal and colonization of Atlantic Canada and Maine by freshwater fishes |
author_facet |
Allen Curry, R. |
author_sort |
Allen Curry, R. |
title |
Late glacial impacts on dispersal and colonization of Atlantic Canada and Maine by freshwater fishes |
title_short |
Late glacial impacts on dispersal and colonization of Atlantic Canada and Maine by freshwater fishes |
title_full |
Late glacial impacts on dispersal and colonization of Atlantic Canada and Maine by freshwater fishes |
title_fullStr |
Late glacial impacts on dispersal and colonization of Atlantic Canada and Maine by freshwater fishes |
title_full_unstemmed |
Late glacial impacts on dispersal and colonization of Atlantic Canada and Maine by freshwater fishes |
title_sort |
late glacial impacts on dispersal and colonization of atlantic canada and maine by freshwater fishes |
publisher |
Cambridge University Press (CUP) |
publishDate |
2007 |
url |
http://dx.doi.org/10.1016/j.yqres.2006.11.002 http://api.elsevier.com/content/article/PII:S0033589406001530?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589406001530?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400004907 |
long_lat |
ENVELOPE(141.383,141.383,-66.800,-66.800) ENVELOPE(-115.002,-115.002,58.384,58.384) |
geographic |
Breton Island Canada Lawrence River |
geographic_facet |
Breton Island Canada Lawrence River |
genre |
Breton Island Prince Edward Island |
genre_facet |
Breton Island Prince Edward Island |
op_source |
Quaternary Research volume 67, issue 2, page 225-233 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1016/j.yqres.2006.11.002 |
container_title |
Quaternary Research |
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67 |
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2 |
container_start_page |
225 |
op_container_end_page |
233 |
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1811637234554634240 |