Ecological patterns of diatom assemblages from Mackenzie Delta lakes, Northwest Territories, Canada
Sediment samples were collected from 77 lakes in the Mackenzie Delta representing a gradient of lakes from those having continual connection with the sediment-laden Mackenzie River to lakes having connection for only a couple of days every few years. Diatom assemblages in all lakes were dominated by...
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crcansciencepubl:10.1139/b99-156 2024-04-28T08:28:03+00:00 Ecological patterns of diatom assemblages from Mackenzie Delta lakes, Northwest Territories, Canada Hay, Murray B Michelutti, Neal Smol, John P 2000 http://dx.doi.org/10.1139/b99-156 http://www.nrcresearchpress.com/doi/pdf/10.1139/b99-156 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Botany volume 78, issue 1, page 19-33 ISSN 0008-4026 Plant Science journal-article 2000 crcansciencepubl https://doi.org/10.1139/b99-156 2024-04-09T06:56:25Z Sediment samples were collected from 77 lakes in the Mackenzie Delta representing a gradient of lakes from those having continual connection with the sediment-laden Mackenzie River to lakes having connection for only a couple of days every few years. Diatom assemblages in all lakes were dominated by a diverse benthic microflora, primarily from the genera Navicula and Nitzschia. Maximum relative abundance of the dominant taxon at all sites was less than 30%, and most taxa did not dominate in more than one or two lakes. Delta lake assemblages were distinct from diatom assemblages associated with other regional transects of upland tundra and forest lakes. Detrended correspondence analysis showed that nonmotile epiphytic genera, such as Cocconeis and Gomphonema, were more common in lakes having a lower influence from the Mackenzie River, reflecting the extensive macrophyte growth within these lakes. Species diversity decreased as macrophyte production increased. Taxa responses along this macrophyte production gradient were modeled using partial least squares regression. Diatoms were sensitive to the degree of river influence, and the related biological and limnological changes, suggesting assemblages can provide an indication of hydrological variability within Mackenzie Delta lakes.Key words: diatoms, detrended correspondence analysis, Mackenzie Delta, floodplain, lakes. Article in Journal/Newspaper Mackenzie Delta Mackenzie river Northwest Territories Tundra Canadian Science Publishing Canadian Journal of Botany 78 1 19 33 |
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Plant Science |
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Plant Science Hay, Murray B Michelutti, Neal Smol, John P Ecological patterns of diatom assemblages from Mackenzie Delta lakes, Northwest Territories, Canada |
topic_facet |
Plant Science |
description |
Sediment samples were collected from 77 lakes in the Mackenzie Delta representing a gradient of lakes from those having continual connection with the sediment-laden Mackenzie River to lakes having connection for only a couple of days every few years. Diatom assemblages in all lakes were dominated by a diverse benthic microflora, primarily from the genera Navicula and Nitzschia. Maximum relative abundance of the dominant taxon at all sites was less than 30%, and most taxa did not dominate in more than one or two lakes. Delta lake assemblages were distinct from diatom assemblages associated with other regional transects of upland tundra and forest lakes. Detrended correspondence analysis showed that nonmotile epiphytic genera, such as Cocconeis and Gomphonema, were more common in lakes having a lower influence from the Mackenzie River, reflecting the extensive macrophyte growth within these lakes. Species diversity decreased as macrophyte production increased. Taxa responses along this macrophyte production gradient were modeled using partial least squares regression. Diatoms were sensitive to the degree of river influence, and the related biological and limnological changes, suggesting assemblages can provide an indication of hydrological variability within Mackenzie Delta lakes.Key words: diatoms, detrended correspondence analysis, Mackenzie Delta, floodplain, lakes. |
format |
Article in Journal/Newspaper |
author |
Hay, Murray B Michelutti, Neal Smol, John P |
author_facet |
Hay, Murray B Michelutti, Neal Smol, John P |
author_sort |
Hay, Murray B |
title |
Ecological patterns of diatom assemblages from Mackenzie Delta lakes, Northwest Territories, Canada |
title_short |
Ecological patterns of diatom assemblages from Mackenzie Delta lakes, Northwest Territories, Canada |
title_full |
Ecological patterns of diatom assemblages from Mackenzie Delta lakes, Northwest Territories, Canada |
title_fullStr |
Ecological patterns of diatom assemblages from Mackenzie Delta lakes, Northwest Territories, Canada |
title_full_unstemmed |
Ecological patterns of diatom assemblages from Mackenzie Delta lakes, Northwest Territories, Canada |
title_sort |
ecological patterns of diatom assemblages from mackenzie delta lakes, northwest territories, canada |
publisher |
Canadian Science Publishing |
publishDate |
2000 |
url |
http://dx.doi.org/10.1139/b99-156 http://www.nrcresearchpress.com/doi/pdf/10.1139/b99-156 |
genre |
Mackenzie Delta Mackenzie river Northwest Territories Tundra |
genre_facet |
Mackenzie Delta Mackenzie river Northwest Territories Tundra |
op_source |
Canadian Journal of Botany volume 78, issue 1, page 19-33 ISSN 0008-4026 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/b99-156 |
container_title |
Canadian Journal of Botany |
container_volume |
78 |
container_issue |
1 |
container_start_page |
19 |
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33 |
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1797586740780728320 |