Characteristics and primary productivity of East Antarctic pack ice during the winter-spring transition
Microbial communities have evolved mechanisms to allow them to survive within the challenging and changing pack ice environment. One such mechanism may be the exudation of photosynthetically-derived organic carbon into various extracellular pools. During the 2nd Sea Ice Physics and Ecosystems eXperi...
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Online Access: | https://doi.org/10.1016/j.dsr2.2015.12.013 http://ecite.utas.edu.au/113146 |
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ftunivtasecite:oai:ecite.utas.edu.au:113146 2023-05-15T13:49:03+02:00 Characteristics and primary productivity of East Antarctic pack ice during the winter-spring transition Ugalde, SC Westwood, KJ van den Enden, R McMinn, A Meiners, KM 2016 https://doi.org/10.1016/j.dsr2.2015.12.013 http://ecite.utas.edu.au/113146 en eng Pergamon-Elsevier Science Ltd http://dx.doi.org/10.1016/j.dsr2.2015.12.013 Ugalde, SC and Westwood, KJ and van den Enden, R and McMinn, A and Meiners, KM, Characteristics and primary productivity of East Antarctic pack ice during the winter-spring transition, Deep-Sea Research II, 131 pp. 123-139. ISSN 0967-0645 (2016) [Refereed Article] http://ecite.utas.edu.au/113146 Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) Refereed Article PeerReviewed 2016 ftunivtasecite https://doi.org/10.1016/j.dsr2.2015.12.013 2019-12-13T22:13:13Z Microbial communities have evolved mechanisms to allow them to survive within the challenging and changing pack ice environment. One such mechanism may be the exudation of photosynthetically-derived organic carbon into various extracellular pools. During the 2nd Sea Ice Physics and Ecosystems eXperiment (SIPEX-2), East Antarctic pack ice productivity and subsequent carbon allocation were quantified, together with physico-biogeochemical characteristics (29 September28 October, 2012). Mean ice thickness ranged between 0.80 and 2.16 m, and typically exhibited a warm ice interior with weak temperature gradients. All stations, with one exception, were layered with granular (mean: 78%), columnar (mean: 15%), and mixed granular/columnar (mean: 4%) ice. Highest ice brine-volume fractions were at the icewater interface, but all ice had high brine-volume fractions conducive for brine percolation (mean: 15%). Dissolved inorganic nutrient concentrations in the brine were scattered around theoretical dilution lines (TDLs), with some values of nitrate and nitrite, ammonium and silicic acid falling below TDLs, indicating nutrient depletion. Bulk ice dissolved organic carbon was low (mean: 64molkg −1 ), but most samples showed enrichment in relation to TDLs. Microbial biomass (bacterial and algal) was low, and generally showed maxima in the sea-ice interior. Bottom ice algal communities were dominated by pennate diatom species (mean: 86% of total cell abundance). 14 C-total primary productivity ( 14 C-TPP) ranged from <0.01 to 2.22mgC (mgchl a) −1 d −1 (<0.01 to 3.03mgCm −2 d −1 ). The relative contribution of 14 C-total extracellular organic carbon ( 14 C-TEOC) to 14 C-TPP decreased over the observational period (range: 4421%), with the remaining proportion being 14 C-particulate organic carbon. 14 C-TEOC composition was dominated by low molecular weight 14 C-extracellular dissolved organic carbon (mean: 61%), with the remaining proportion allocated to 14 C-colloidal organic carbon. Production of 14 C-extracellular polymeric substances was not detected at any station. Article in Journal/Newspaper Antarc* Antarctic Sea ice eCite UTAS (University of Tasmania) Antarctic Deep Sea Research Part II: Topical Studies in Oceanography 131 123 139 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) |
spellingShingle |
Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) Ugalde, SC Westwood, KJ van den Enden, R McMinn, A Meiners, KM Characteristics and primary productivity of East Antarctic pack ice during the winter-spring transition |
topic_facet |
Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) |
description |
Microbial communities have evolved mechanisms to allow them to survive within the challenging and changing pack ice environment. One such mechanism may be the exudation of photosynthetically-derived organic carbon into various extracellular pools. During the 2nd Sea Ice Physics and Ecosystems eXperiment (SIPEX-2), East Antarctic pack ice productivity and subsequent carbon allocation were quantified, together with physico-biogeochemical characteristics (29 September28 October, 2012). Mean ice thickness ranged between 0.80 and 2.16 m, and typically exhibited a warm ice interior with weak temperature gradients. All stations, with one exception, were layered with granular (mean: 78%), columnar (mean: 15%), and mixed granular/columnar (mean: 4%) ice. Highest ice brine-volume fractions were at the icewater interface, but all ice had high brine-volume fractions conducive for brine percolation (mean: 15%). Dissolved inorganic nutrient concentrations in the brine were scattered around theoretical dilution lines (TDLs), with some values of nitrate and nitrite, ammonium and silicic acid falling below TDLs, indicating nutrient depletion. Bulk ice dissolved organic carbon was low (mean: 64molkg −1 ), but most samples showed enrichment in relation to TDLs. Microbial biomass (bacterial and algal) was low, and generally showed maxima in the sea-ice interior. Bottom ice algal communities were dominated by pennate diatom species (mean: 86% of total cell abundance). 14 C-total primary productivity ( 14 C-TPP) ranged from <0.01 to 2.22mgC (mgchl a) −1 d −1 (<0.01 to 3.03mgCm −2 d −1 ). The relative contribution of 14 C-total extracellular organic carbon ( 14 C-TEOC) to 14 C-TPP decreased over the observational period (range: 4421%), with the remaining proportion being 14 C-particulate organic carbon. 14 C-TEOC composition was dominated by low molecular weight 14 C-extracellular dissolved organic carbon (mean: 61%), with the remaining proportion allocated to 14 C-colloidal organic carbon. Production of 14 C-extracellular polymeric substances was not detected at any station. |
format |
Article in Journal/Newspaper |
author |
Ugalde, SC Westwood, KJ van den Enden, R McMinn, A Meiners, KM |
author_facet |
Ugalde, SC Westwood, KJ van den Enden, R McMinn, A Meiners, KM |
author_sort |
Ugalde, SC |
title |
Characteristics and primary productivity of East Antarctic pack ice during the winter-spring transition |
title_short |
Characteristics and primary productivity of East Antarctic pack ice during the winter-spring transition |
title_full |
Characteristics and primary productivity of East Antarctic pack ice during the winter-spring transition |
title_fullStr |
Characteristics and primary productivity of East Antarctic pack ice during the winter-spring transition |
title_full_unstemmed |
Characteristics and primary productivity of East Antarctic pack ice during the winter-spring transition |
title_sort |
characteristics and primary productivity of east antarctic pack ice during the winter-spring transition |
publisher |
Pergamon-Elsevier Science Ltd |
publishDate |
2016 |
url |
https://doi.org/10.1016/j.dsr2.2015.12.013 http://ecite.utas.edu.au/113146 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Sea ice |
genre_facet |
Antarc* Antarctic Sea ice |
op_relation |
http://dx.doi.org/10.1016/j.dsr2.2015.12.013 Ugalde, SC and Westwood, KJ and van den Enden, R and McMinn, A and Meiners, KM, Characteristics and primary productivity of East Antarctic pack ice during the winter-spring transition, Deep-Sea Research II, 131 pp. 123-139. ISSN 0967-0645 (2016) [Refereed Article] http://ecite.utas.edu.au/113146 |
op_doi |
https://doi.org/10.1016/j.dsr2.2015.12.013 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
131 |
container_start_page |
123 |
op_container_end_page |
139 |
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1766250681193201664 |