Changes in glacial meltwater alter algal communities in lakes of Scoresby Sund, Renland, East Greenland throughout the Holocene: Abrupt reorganizations began 1000 years before present
We investigated the response of lake algal communities to changes in glacial meltwater from the Renland Ice Cap (Greenland) through the Holocene to assess whether influxes always elicit consistent responses or novel responses. We measured sedimentary algal pigments in two proximal lakes, snow-fed Ra...
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Format: | Article in Journal/Newspaper |
Language: | English |
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2016
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Online Access: | http://dx.doi.org/10.1177/0959683616678468 http://journals.sagepub.com/doi/pdf/10.1177/0959683616678468 http://journals.sagepub.com/doi/full-xml/10.1177/0959683616678468 |
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crsagepubl:10.1177/0959683616678468 2023-05-15T16:03:54+02:00 Changes in glacial meltwater alter algal communities in lakes of Scoresby Sund, Renland, East Greenland throughout the Holocene: Abrupt reorganizations began 1000 years before present Slemmons, Krista EH Medford, Aaron Hall, Brenda L Stone, Jeffery R McGowan, Suzanne Lowell, Thomas Kelly, Meredith Saros, Jasmine E 2016 http://dx.doi.org/10.1177/0959683616678468 http://journals.sagepub.com/doi/pdf/10.1177/0959683616678468 http://journals.sagepub.com/doi/full-xml/10.1177/0959683616678468 en eng SAGE Publications http://journals.sagepub.com/page/policies/text-and-data-mining-license The Holocene volume 27, issue 7, page 929-940 ISSN 0959-6836 1477-0911 Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change journal-article 2016 crsagepubl https://doi.org/10.1177/0959683616678468 2022-09-28T19:11:07Z We investigated the response of lake algal communities to changes in glacial meltwater from the Renland Ice Cap (Greenland) through the Holocene to assess whether influxes always elicit consistent responses or novel responses. We measured sedimentary algal pigments in two proximal lakes, snow-fed Raven and glacier- and snow-fed Bunny Lake, and diatom community structure and turnover in Bunny Lake. Diatom data were not available in Raven Lake. We also modeled lake-level change in Bunny Lake to identify how glacial meltwater may have altered diatom habitat availability through time. Through a series of glacier advances and retreats over the Holocene, the algal response in Bunny Lake was relatively constant until approximately 1015 yr BP, after which there were major changes in sedimentary algal remains. Algal pigment concentrations sharply declined, and diatom species richness increased. Diatom community structure underwent three reorganizations. Until 1015 yr BP, assemblages were dominated by Pinnularia braunii and Aulacoseira pffaffiana. However, approximately 1015–480 yr BP, these species declined and Tabellaria flocculosa and Hannaea arcus became a significant component of the assemblage. Approximately 440 yr BP, A. pfaffiana increased along with species indicating elevated nitrogen. In contrast, the algal pigment records from nearby snow-fed Raven Lake showed different and minimal change through time. Our results suggest that changes in the magnitude and composition of meltwater in our two study lakes were unique over the last 1000 yr BP and elicited a non-linear threshold response absent during other periods of glacier advance and retreat. Deciphering the degree to which glaciers structure algal communities over time has strong implications for lakes as glaciers continue to recede. Article in Journal/Newspaper East Greenland glacier Greenland Ice cap Scoresby Sund SAGE Publications (via Crossref) Greenland Renland ENVELOPE(-26.750,-26.750,71.200,71.200) Scoresby ENVELOPE(162.750,162.750,-66.567,-66.567) Scoresby Sund ENVELOPE(-24.387,-24.387,70.476,70.476) Sund ENVELOPE(13.644,13.644,66.207,66.207) The Holocene 27 7 929 940 |
institution |
Open Polar |
collection |
SAGE Publications (via Crossref) |
op_collection_id |
crsagepubl |
language |
English |
topic |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change |
spellingShingle |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change Slemmons, Krista EH Medford, Aaron Hall, Brenda L Stone, Jeffery R McGowan, Suzanne Lowell, Thomas Kelly, Meredith Saros, Jasmine E Changes in glacial meltwater alter algal communities in lakes of Scoresby Sund, Renland, East Greenland throughout the Holocene: Abrupt reorganizations began 1000 years before present |
topic_facet |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change |
description |
We investigated the response of lake algal communities to changes in glacial meltwater from the Renland Ice Cap (Greenland) through the Holocene to assess whether influxes always elicit consistent responses or novel responses. We measured sedimentary algal pigments in two proximal lakes, snow-fed Raven and glacier- and snow-fed Bunny Lake, and diatom community structure and turnover in Bunny Lake. Diatom data were not available in Raven Lake. We also modeled lake-level change in Bunny Lake to identify how glacial meltwater may have altered diatom habitat availability through time. Through a series of glacier advances and retreats over the Holocene, the algal response in Bunny Lake was relatively constant until approximately 1015 yr BP, after which there were major changes in sedimentary algal remains. Algal pigment concentrations sharply declined, and diatom species richness increased. Diatom community structure underwent three reorganizations. Until 1015 yr BP, assemblages were dominated by Pinnularia braunii and Aulacoseira pffaffiana. However, approximately 1015–480 yr BP, these species declined and Tabellaria flocculosa and Hannaea arcus became a significant component of the assemblage. Approximately 440 yr BP, A. pfaffiana increased along with species indicating elevated nitrogen. In contrast, the algal pigment records from nearby snow-fed Raven Lake showed different and minimal change through time. Our results suggest that changes in the magnitude and composition of meltwater in our two study lakes were unique over the last 1000 yr BP and elicited a non-linear threshold response absent during other periods of glacier advance and retreat. Deciphering the degree to which glaciers structure algal communities over time has strong implications for lakes as glaciers continue to recede. |
format |
Article in Journal/Newspaper |
author |
Slemmons, Krista EH Medford, Aaron Hall, Brenda L Stone, Jeffery R McGowan, Suzanne Lowell, Thomas Kelly, Meredith Saros, Jasmine E |
author_facet |
Slemmons, Krista EH Medford, Aaron Hall, Brenda L Stone, Jeffery R McGowan, Suzanne Lowell, Thomas Kelly, Meredith Saros, Jasmine E |
author_sort |
Slemmons, Krista EH |
title |
Changes in glacial meltwater alter algal communities in lakes of Scoresby Sund, Renland, East Greenland throughout the Holocene: Abrupt reorganizations began 1000 years before present |
title_short |
Changes in glacial meltwater alter algal communities in lakes of Scoresby Sund, Renland, East Greenland throughout the Holocene: Abrupt reorganizations began 1000 years before present |
title_full |
Changes in glacial meltwater alter algal communities in lakes of Scoresby Sund, Renland, East Greenland throughout the Holocene: Abrupt reorganizations began 1000 years before present |
title_fullStr |
Changes in glacial meltwater alter algal communities in lakes of Scoresby Sund, Renland, East Greenland throughout the Holocene: Abrupt reorganizations began 1000 years before present |
title_full_unstemmed |
Changes in glacial meltwater alter algal communities in lakes of Scoresby Sund, Renland, East Greenland throughout the Holocene: Abrupt reorganizations began 1000 years before present |
title_sort |
changes in glacial meltwater alter algal communities in lakes of scoresby sund, renland, east greenland throughout the holocene: abrupt reorganizations began 1000 years before present |
publisher |
SAGE Publications |
publishDate |
2016 |
url |
http://dx.doi.org/10.1177/0959683616678468 http://journals.sagepub.com/doi/pdf/10.1177/0959683616678468 http://journals.sagepub.com/doi/full-xml/10.1177/0959683616678468 |
long_lat |
ENVELOPE(-26.750,-26.750,71.200,71.200) ENVELOPE(162.750,162.750,-66.567,-66.567) ENVELOPE(-24.387,-24.387,70.476,70.476) ENVELOPE(13.644,13.644,66.207,66.207) |
geographic |
Greenland Renland Scoresby Scoresby Sund Sund |
geographic_facet |
Greenland Renland Scoresby Scoresby Sund Sund |
genre |
East Greenland glacier Greenland Ice cap Scoresby Sund |
genre_facet |
East Greenland glacier Greenland Ice cap Scoresby Sund |
op_source |
The Holocene volume 27, issue 7, page 929-940 ISSN 0959-6836 1477-0911 |
op_rights |
http://journals.sagepub.com/page/policies/text-and-data-mining-license |
op_doi |
https://doi.org/10.1177/0959683616678468 |
container_title |
The Holocene |
container_volume |
27 |
container_issue |
7 |
container_start_page |
929 |
op_container_end_page |
940 |
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1766399592335671296 |