Identification of organic matter sources in sulfidic late Holocene Antarctic fjord sediments from fossil rDNA sequence analysis
Author Posting. © American Geophysical Union, 2007. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 22 (2007): PA2211, doi:10.1029/2006PA001309. The 18S ribosomal DNA (rDNA) iso...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/3447 2023-05-15T13:53:14+02:00 Identification of organic matter sources in sulfidic late Holocene Antarctic fjord sediments from fossil rDNA sequence analysis Coolen, Marco J. L. Volkman, John K. Abbas, Ben Muyzer, Gerard Schouten, Stefan Sinninghe Damste, Jaap S. 2007-05-09 application/pdf https://hdl.handle.net/1912/3447 en_US eng American Geophysical Union https://doi.org/10.1029/2006PA001309 Paleoceanography 22 (2007): PA2211 https://hdl.handle.net/1912/3447 doi:10.1029/2006PA001309 Paleoceanography 22 (2007): PA2211 doi:10.1029/2006PA001309 Ancient DNA Diatoms Ellis Fjord Article 2007 ftwhoas https://doi.org/10.1029/2006PA001309 2022-05-28T22:57:58Z Author Posting. © American Geophysical Union, 2007. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 22 (2007): PA2211, doi:10.1029/2006PA001309. The 18S ribosomal DNA (rDNA) isolated from sulfidic Holocene sediments and particulate organic matter in the water column of the stratified Small Meromictic Basin (SMB) in Ellis Fjord (eastern Antarctica) was analyzed to identify possible biological sources of organic matter. Previous work had shown that the sediments contained numerous diatom frustules and high contents of a highly branched isoprenoid (HBI) C25:2 alkene (which is a specific biomarker of certain species of the diatom genera Navicula, Haslea, Pleurosigma, or Rhizosolenia), so we focused our search on preserved fossil 18S rDNA of diatoms using sensitive polymerase chain reaction (PCR) approaches. We did not find diatom-derived fossil 18S rDNA using general eukaryotic primers, and even when we used primers selective for diatom 18S rDNA, we only identified a Chaetoceros phylotype, which is known to form cysts in the SMB but is not a likely source of the C25:2 HBI. When we used PCR/denaturing gradient gel electrophoresis methods specific to phylotypes within the HBI-biosynthesizing genera, we were able to identify three phylotypes in the sediments related to HBI-producing strains of the genera Haslea and Navicula. The ancient DNA data thus provided a limited, but valuable, view of the diversity of late Holocene primary producers with a particular bias to specific components of the biota that were better preserved such as the Chaetoceros cysts. This use of paleogenetics also revealed unexpected possible sources of organic matter such as novel stramenopiles for which no specific lipid biomarkers are known and thus would not have been identified based on traditional lipid stratigraphy alone. Funding for the collection of the sediment and water samples (by M.J.L.C. and C.W.) was provided ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Antarctic Ellis Fjord ENVELOPE(78.132,78.132,-68.603,-68.603) Paleoceanography 22 2 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Ancient DNA Diatoms Ellis Fjord |
spellingShingle |
Ancient DNA Diatoms Ellis Fjord Coolen, Marco J. L. Volkman, John K. Abbas, Ben Muyzer, Gerard Schouten, Stefan Sinninghe Damste, Jaap S. Identification of organic matter sources in sulfidic late Holocene Antarctic fjord sediments from fossil rDNA sequence analysis |
topic_facet |
Ancient DNA Diatoms Ellis Fjord |
description |
Author Posting. © American Geophysical Union, 2007. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 22 (2007): PA2211, doi:10.1029/2006PA001309. The 18S ribosomal DNA (rDNA) isolated from sulfidic Holocene sediments and particulate organic matter in the water column of the stratified Small Meromictic Basin (SMB) in Ellis Fjord (eastern Antarctica) was analyzed to identify possible biological sources of organic matter. Previous work had shown that the sediments contained numerous diatom frustules and high contents of a highly branched isoprenoid (HBI) C25:2 alkene (which is a specific biomarker of certain species of the diatom genera Navicula, Haslea, Pleurosigma, or Rhizosolenia), so we focused our search on preserved fossil 18S rDNA of diatoms using sensitive polymerase chain reaction (PCR) approaches. We did not find diatom-derived fossil 18S rDNA using general eukaryotic primers, and even when we used primers selective for diatom 18S rDNA, we only identified a Chaetoceros phylotype, which is known to form cysts in the SMB but is not a likely source of the C25:2 HBI. When we used PCR/denaturing gradient gel electrophoresis methods specific to phylotypes within the HBI-biosynthesizing genera, we were able to identify three phylotypes in the sediments related to HBI-producing strains of the genera Haslea and Navicula. The ancient DNA data thus provided a limited, but valuable, view of the diversity of late Holocene primary producers with a particular bias to specific components of the biota that were better preserved such as the Chaetoceros cysts. This use of paleogenetics also revealed unexpected possible sources of organic matter such as novel stramenopiles for which no specific lipid biomarkers are known and thus would not have been identified based on traditional lipid stratigraphy alone. Funding for the collection of the sediment and water samples (by M.J.L.C. and C.W.) was provided ... |
format |
Article in Journal/Newspaper |
author |
Coolen, Marco J. L. Volkman, John K. Abbas, Ben Muyzer, Gerard Schouten, Stefan Sinninghe Damste, Jaap S. |
author_facet |
Coolen, Marco J. L. Volkman, John K. Abbas, Ben Muyzer, Gerard Schouten, Stefan Sinninghe Damste, Jaap S. |
author_sort |
Coolen, Marco J. L. |
title |
Identification of organic matter sources in sulfidic late Holocene Antarctic fjord sediments from fossil rDNA sequence analysis |
title_short |
Identification of organic matter sources in sulfidic late Holocene Antarctic fjord sediments from fossil rDNA sequence analysis |
title_full |
Identification of organic matter sources in sulfidic late Holocene Antarctic fjord sediments from fossil rDNA sequence analysis |
title_fullStr |
Identification of organic matter sources in sulfidic late Holocene Antarctic fjord sediments from fossil rDNA sequence analysis |
title_full_unstemmed |
Identification of organic matter sources in sulfidic late Holocene Antarctic fjord sediments from fossil rDNA sequence analysis |
title_sort |
identification of organic matter sources in sulfidic late holocene antarctic fjord sediments from fossil rdna sequence analysis |
publisher |
American Geophysical Union |
publishDate |
2007 |
url |
https://hdl.handle.net/1912/3447 |
long_lat |
ENVELOPE(78.132,78.132,-68.603,-68.603) |
geographic |
Antarctic Ellis Fjord |
geographic_facet |
Antarctic Ellis Fjord |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
Paleoceanography 22 (2007): PA2211 doi:10.1029/2006PA001309 |
op_relation |
https://doi.org/10.1029/2006PA001309 Paleoceanography 22 (2007): PA2211 https://hdl.handle.net/1912/3447 doi:10.1029/2006PA001309 |
op_doi |
https://doi.org/10.1029/2006PA001309 |
container_title |
Paleoceanography |
container_volume |
22 |
container_issue |
2 |
_version_ |
1766258226452496384 |