Growth dynamics of a laminated microbial mat in response to variable irradiance in an Antarctic lake
© 2016 John Wiley & Sons Ltd. Laminated microbial mats are important ecosystem components of perennially ice-covered Antarctic dry valley lakes. In order to understand better their response to changing environment, we made observations and carried out a manipulation experiment to determine their...
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ftlouisianastuir:oai:digitalcommons.lsu.edu:geo_pubs-1600 2023-06-11T04:06:22+02:00 Growth dynamics of a laminated microbial mat in response to variable irradiance in an Antarctic lake Hawes, Ian Jungblut, Anne D. Obryk, Maciej K. Doran, Peter T. 2016-04-01T07:00:00Z application/pdf https://digitalcommons.lsu.edu/geo_pubs/601 https://doi.org/10.1111/fwb.12715 https://digitalcommons.lsu.edu/context/geo_pubs/article/1600/viewcontent/601.pdf unknown LSU Digital Commons https://digitalcommons.lsu.edu/geo_pubs/601 doi:10.1111/fwb.12715 https://digitalcommons.lsu.edu/context/geo_pubs/article/1600/viewcontent/601.pdf Faculty Publications 16S rRNA gene Benthic Cyanobacteria Environmental change Lake Fryxell text 2016 ftlouisianastuir https://doi.org/10.1111/fwb.12715 2023-05-28T18:24:40Z © 2016 John Wiley & Sons Ltd. Laminated microbial mats are important ecosystem components of perennially ice-covered Antarctic dry valley lakes. In order to understand better their response to changing environment, we made observations and carried out a manipulation experiment to determine their response to variations in irradiance in Lake Hoare (77°38′ S, 162°53′ E). Ice transparency was the most variable parameter that affected benthic light dose, both spatially and between years. Patterns of lamina accrual corresponded to irradiance history, with laminae that were initiated in high transmission years thicker than those from low transmission years. A shading experiment confirmed that accrual of lamina thickness, calcite precipitation and ash-free dry mass were determined by irradiance, but photosynthetic biomass and phototrophic species composition were less affected. Buried laminae decomposed only slowly over time, with potentially viable phototrophs many laminae down into the microbial mat. Decay rate increased only slightly with shading. We conclude that the microbial mats in Lake Hoare are characterised by remarkable stability, with slow accumulation rates and turnover of biomass over time. Photosynthetic biomass and species composition appeared to be stable across long time periods, with interannual variation in lamination pattern due to differential accumulation of extracellular polysaccharide and representing the visible expression of annual growth conditions. Text Antarc* Antarctic LSU Digital Commons (Louisiana State University) Antarctic Fryxell ENVELOPE(163.183,163.183,-77.617,-77.617) Hoare ENVELOPE(162.850,162.850,-77.633,-77.633) Lake Fryxell ENVELOPE(163.183,163.183,-77.617,-77.617) Lake Hoare ENVELOPE(162.850,162.850,-77.633,-77.633) Freshwater Biology 61 4 396 410 |
institution |
Open Polar |
collection |
LSU Digital Commons (Louisiana State University) |
op_collection_id |
ftlouisianastuir |
language |
unknown |
topic |
16S rRNA gene Benthic Cyanobacteria Environmental change Lake Fryxell |
spellingShingle |
16S rRNA gene Benthic Cyanobacteria Environmental change Lake Fryxell Hawes, Ian Jungblut, Anne D. Obryk, Maciej K. Doran, Peter T. Growth dynamics of a laminated microbial mat in response to variable irradiance in an Antarctic lake |
topic_facet |
16S rRNA gene Benthic Cyanobacteria Environmental change Lake Fryxell |
description |
© 2016 John Wiley & Sons Ltd. Laminated microbial mats are important ecosystem components of perennially ice-covered Antarctic dry valley lakes. In order to understand better their response to changing environment, we made observations and carried out a manipulation experiment to determine their response to variations in irradiance in Lake Hoare (77°38′ S, 162°53′ E). Ice transparency was the most variable parameter that affected benthic light dose, both spatially and between years. Patterns of lamina accrual corresponded to irradiance history, with laminae that were initiated in high transmission years thicker than those from low transmission years. A shading experiment confirmed that accrual of lamina thickness, calcite precipitation and ash-free dry mass were determined by irradiance, but photosynthetic biomass and phototrophic species composition were less affected. Buried laminae decomposed only slowly over time, with potentially viable phototrophs many laminae down into the microbial mat. Decay rate increased only slightly with shading. We conclude that the microbial mats in Lake Hoare are characterised by remarkable stability, with slow accumulation rates and turnover of biomass over time. Photosynthetic biomass and species composition appeared to be stable across long time periods, with interannual variation in lamination pattern due to differential accumulation of extracellular polysaccharide and representing the visible expression of annual growth conditions. |
format |
Text |
author |
Hawes, Ian Jungblut, Anne D. Obryk, Maciej K. Doran, Peter T. |
author_facet |
Hawes, Ian Jungblut, Anne D. Obryk, Maciej K. Doran, Peter T. |
author_sort |
Hawes, Ian |
title |
Growth dynamics of a laminated microbial mat in response to variable irradiance in an Antarctic lake |
title_short |
Growth dynamics of a laminated microbial mat in response to variable irradiance in an Antarctic lake |
title_full |
Growth dynamics of a laminated microbial mat in response to variable irradiance in an Antarctic lake |
title_fullStr |
Growth dynamics of a laminated microbial mat in response to variable irradiance in an Antarctic lake |
title_full_unstemmed |
Growth dynamics of a laminated microbial mat in response to variable irradiance in an Antarctic lake |
title_sort |
growth dynamics of a laminated microbial mat in response to variable irradiance in an antarctic lake |
publisher |
LSU Digital Commons |
publishDate |
2016 |
url |
https://digitalcommons.lsu.edu/geo_pubs/601 https://doi.org/10.1111/fwb.12715 https://digitalcommons.lsu.edu/context/geo_pubs/article/1600/viewcontent/601.pdf |
long_lat |
ENVELOPE(163.183,163.183,-77.617,-77.617) ENVELOPE(162.850,162.850,-77.633,-77.633) ENVELOPE(163.183,163.183,-77.617,-77.617) ENVELOPE(162.850,162.850,-77.633,-77.633) |
geographic |
Antarctic Fryxell Hoare Lake Fryxell Lake Hoare |
geographic_facet |
Antarctic Fryxell Hoare Lake Fryxell Lake Hoare |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Faculty Publications |
op_relation |
https://digitalcommons.lsu.edu/geo_pubs/601 doi:10.1111/fwb.12715 https://digitalcommons.lsu.edu/context/geo_pubs/article/1600/viewcontent/601.pdf |
op_doi |
https://doi.org/10.1111/fwb.12715 |
container_title |
Freshwater Biology |
container_volume |
61 |
container_issue |
4 |
container_start_page |
396 |
op_container_end_page |
410 |
_version_ |
1768378273992015872 |