Organic geochemical studies of modern microbial mats from Shark Bay: Part I: Influence of depth and salinity on lipid biomarkers and their isotopic signatures
Abstract The present study investigated the influence of abiotic conditions on microbial mat communities from Shark Bay, a World Heritage area well known for a diverse range of extant mats presenting structural similarities with ancient stromatolites. The distributions and stable carbon isotopic val...
Published in: | Geobiology |
---|---|
Main Authors: | , , , , , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2014
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1111/gbi.12094 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fgbi.12094 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gbi.12094 |
id |
crwiley:10.1111/gbi.12094 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1111/gbi.12094 2024-06-02T07:57:12+00:00 Organic geochemical studies of modern microbial mats from Shark Bay: Part I: Influence of depth and salinity on lipid biomarkers and their isotopic signatures Pagès, A. Grice, K. Ertefai, T. Skrzypek, G. Jahnert, R. Greenwood, P. Australian Research Council 2014 http://dx.doi.org/10.1111/gbi.12094 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fgbi.12094 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gbi.12094 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Geobiology volume 12, issue 5, page 469-487 ISSN 1472-4677 1472-4669 journal-article 2014 crwiley https://doi.org/10.1111/gbi.12094 2024-05-03T11:42:57Z Abstract The present study investigated the influence of abiotic conditions on microbial mat communities from Shark Bay, a World Heritage area well known for a diverse range of extant mats presenting structural similarities with ancient stromatolites. The distributions and stable carbon isotopic values of lipid biomarkers [aliphatic hydrocarbons and polar lipid fatty acids ( PLFA s)] and bulk carbon and nitrogen isotope values of biomass were analysed in four different types of mats along a tidal flat gradient to characterize the microbial communities and systematically investigate the relationship of the above parameters with water depth. Cyanobacteria were dominant in all mats, as demonstrated by the presence of diagnostic hydrocarbons (e.g. n ‐C 17 and n‐ C 17:1 ). Several subtle but important differences in lipid composition across the littoral gradient were, however, evident. For instance, the shallower mats contained a higher diatom contribution, concordant with previous mat studies from other locations (e.g. Antarctica). Conversely, the organic matter ( OM ) of the deeper mats showed evidence for a higher seagrass contribution [high C/N, 13 C‐depleted long‐chain n ‐alkanes]. The morphological structure of the mats may have influenced CO 2 diffusion leading to more 13 C‐enriched lipids in the shallow mats. Alternatively, changes in CO 2 fixation pathways, such as increase in the acetyl COA ‐pathway by sulphate‐reducing bacteria, could have also caused the observed shifts in δ 13 C values of the mats. In addition, three smooth mats from different Shark Bay sites were analysed to investigate potential functional relationship of the microbial communities with differing salinity levels. The C 25:1 HBI was identified in the high salinity mat only and a lower abundance of PLFA s associated with diatoms was observed in the less saline mats, suggesting a higher abundance of diatoms at the most saline site. Furthermore, it appeared that the most and least saline mats were dominated by autotrophic biomass using ... Article in Journal/Newspaper Antarc* Antarctica Wiley Online Library Geobiology 12 5 469 487 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract The present study investigated the influence of abiotic conditions on microbial mat communities from Shark Bay, a World Heritage area well known for a diverse range of extant mats presenting structural similarities with ancient stromatolites. The distributions and stable carbon isotopic values of lipid biomarkers [aliphatic hydrocarbons and polar lipid fatty acids ( PLFA s)] and bulk carbon and nitrogen isotope values of biomass were analysed in four different types of mats along a tidal flat gradient to characterize the microbial communities and systematically investigate the relationship of the above parameters with water depth. Cyanobacteria were dominant in all mats, as demonstrated by the presence of diagnostic hydrocarbons (e.g. n ‐C 17 and n‐ C 17:1 ). Several subtle but important differences in lipid composition across the littoral gradient were, however, evident. For instance, the shallower mats contained a higher diatom contribution, concordant with previous mat studies from other locations (e.g. Antarctica). Conversely, the organic matter ( OM ) of the deeper mats showed evidence for a higher seagrass contribution [high C/N, 13 C‐depleted long‐chain n ‐alkanes]. The morphological structure of the mats may have influenced CO 2 diffusion leading to more 13 C‐enriched lipids in the shallow mats. Alternatively, changes in CO 2 fixation pathways, such as increase in the acetyl COA ‐pathway by sulphate‐reducing bacteria, could have also caused the observed shifts in δ 13 C values of the mats. In addition, three smooth mats from different Shark Bay sites were analysed to investigate potential functional relationship of the microbial communities with differing salinity levels. The C 25:1 HBI was identified in the high salinity mat only and a lower abundance of PLFA s associated with diatoms was observed in the less saline mats, suggesting a higher abundance of diatoms at the most saline site. Furthermore, it appeared that the most and least saline mats were dominated by autotrophic biomass using ... |
author2 |
Australian Research Council |
format |
Article in Journal/Newspaper |
author |
Pagès, A. Grice, K. Ertefai, T. Skrzypek, G. Jahnert, R. Greenwood, P. |
spellingShingle |
Pagès, A. Grice, K. Ertefai, T. Skrzypek, G. Jahnert, R. Greenwood, P. Organic geochemical studies of modern microbial mats from Shark Bay: Part I: Influence of depth and salinity on lipid biomarkers and their isotopic signatures |
author_facet |
Pagès, A. Grice, K. Ertefai, T. Skrzypek, G. Jahnert, R. Greenwood, P. |
author_sort |
Pagès, A. |
title |
Organic geochemical studies of modern microbial mats from Shark Bay: Part I: Influence of depth and salinity on lipid biomarkers and their isotopic signatures |
title_short |
Organic geochemical studies of modern microbial mats from Shark Bay: Part I: Influence of depth and salinity on lipid biomarkers and their isotopic signatures |
title_full |
Organic geochemical studies of modern microbial mats from Shark Bay: Part I: Influence of depth and salinity on lipid biomarkers and their isotopic signatures |
title_fullStr |
Organic geochemical studies of modern microbial mats from Shark Bay: Part I: Influence of depth and salinity on lipid biomarkers and their isotopic signatures |
title_full_unstemmed |
Organic geochemical studies of modern microbial mats from Shark Bay: Part I: Influence of depth and salinity on lipid biomarkers and their isotopic signatures |
title_sort |
organic geochemical studies of modern microbial mats from shark bay: part i: influence of depth and salinity on lipid biomarkers and their isotopic signatures |
publisher |
Wiley |
publishDate |
2014 |
url |
http://dx.doi.org/10.1111/gbi.12094 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fgbi.12094 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gbi.12094 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Geobiology volume 12, issue 5, page 469-487 ISSN 1472-4677 1472-4669 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/gbi.12094 |
container_title |
Geobiology |
container_volume |
12 |
container_issue |
5 |
container_start_page |
469 |
op_container_end_page |
487 |
_version_ |
1800739696540647424 |