Influence of oceanographic variability on near‐shore microbial communities of the sub‐Antarctic Prince Edward Islands
Abstract The Prince Edward Islands (PEIs) lie within the Antarctic Circumpolar Current (ACC), in a transition zone bordered by the sub‐Antarctic Front (SAF) to the north and the Antarctic Polar Front (APF) in the south. A climate‐driven southward shift of the ACC and its frontal systems, the SAF and...
Published in: | Limnology and Oceanography |
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crwiley:10.1002/lno.11035 2024-09-09T19:03:15+00:00 Influence of oceanographic variability on near‐shore microbial communities of the sub‐Antarctic Prince Edward Islands Venkatachalam, Siddarthan Matcher, Gwynneth F. Lamont, Tarron van den Berg, Marcel Ansorge, Isabelle J. Dorrington, Rosemary A. South African National Antarctic Programme South African National Research Foundation Rhodes University Sandisa Imbewu Programme DST/NRF SARChI Post-Doctoral Fellowship South African Department of Environmental Affairs 2018 http://dx.doi.org/10.1002/lno.11035 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.11035 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11035 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 64, issue 1, page 258-271 ISSN 0024-3590 1939-5590 journal-article 2018 crwiley https://doi.org/10.1002/lno.11035 2024-08-01T04:23:36Z Abstract The Prince Edward Islands (PEIs) lie within the Antarctic Circumpolar Current (ACC), in a transition zone bordered by the sub‐Antarctic Front (SAF) to the north and the Antarctic Polar Front (APF) in the south. A climate‐driven southward shift of the ACC and its frontal systems, the SAF and APF, in the vicinity of the PEIs is associated with a long‐term decline in the frequency of island‐associated phytoplankton blooms. These oceanographic perturbations coincide with significant declines in top predator populations attributed to shifts in the distribution and availability of prey, illustrating the interconnectedness between the marine and terrestrial ecosystems of the PEIs. This study investigated the influence of oceanographic variability on the marine ecosystem of the PEIs. A shift in phytoplankton and bacterial communities was observed that coincides with the position of the southern branch of the SAF, which was located to the north of the PEIs during 2014 and to the south during 2012, 2013, and 2015. These shifts in the diversity and structure of marine microbial communities correlate with significant perturbations in the position of the SAF relative to the islands leading us to conlclude that bacterial and phytoplankton communities in the PEI region are strongly influenced by shifts in the position of the SAF relative to the PEIs. This study highlights the critical need to link on‐going physical time series measurements with biological observations to provide a better understanding of the direct role that the upstream dynamics has on the near‐shore island environment and its productivity. Article in Journal/Newspaper Antarc* Antarctic Prince Edward Islands Wiley Online Library Antarctic The Antarctic Shore Island ENVELOPE(-97.912,-97.912,59.641,59.641) Limnology and Oceanography 64 1 258 271 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract The Prince Edward Islands (PEIs) lie within the Antarctic Circumpolar Current (ACC), in a transition zone bordered by the sub‐Antarctic Front (SAF) to the north and the Antarctic Polar Front (APF) in the south. A climate‐driven southward shift of the ACC and its frontal systems, the SAF and APF, in the vicinity of the PEIs is associated with a long‐term decline in the frequency of island‐associated phytoplankton blooms. These oceanographic perturbations coincide with significant declines in top predator populations attributed to shifts in the distribution and availability of prey, illustrating the interconnectedness between the marine and terrestrial ecosystems of the PEIs. This study investigated the influence of oceanographic variability on the marine ecosystem of the PEIs. A shift in phytoplankton and bacterial communities was observed that coincides with the position of the southern branch of the SAF, which was located to the north of the PEIs during 2014 and to the south during 2012, 2013, and 2015. These shifts in the diversity and structure of marine microbial communities correlate with significant perturbations in the position of the SAF relative to the islands leading us to conlclude that bacterial and phytoplankton communities in the PEI region are strongly influenced by shifts in the position of the SAF relative to the PEIs. This study highlights the critical need to link on‐going physical time series measurements with biological observations to provide a better understanding of the direct role that the upstream dynamics has on the near‐shore island environment and its productivity. |
author2 |
South African National Antarctic Programme South African National Research Foundation Rhodes University Sandisa Imbewu Programme DST/NRF SARChI Post-Doctoral Fellowship South African Department of Environmental Affairs |
format |
Article in Journal/Newspaper |
author |
Venkatachalam, Siddarthan Matcher, Gwynneth F. Lamont, Tarron van den Berg, Marcel Ansorge, Isabelle J. Dorrington, Rosemary A. |
spellingShingle |
Venkatachalam, Siddarthan Matcher, Gwynneth F. Lamont, Tarron van den Berg, Marcel Ansorge, Isabelle J. Dorrington, Rosemary A. Influence of oceanographic variability on near‐shore microbial communities of the sub‐Antarctic Prince Edward Islands |
author_facet |
Venkatachalam, Siddarthan Matcher, Gwynneth F. Lamont, Tarron van den Berg, Marcel Ansorge, Isabelle J. Dorrington, Rosemary A. |
author_sort |
Venkatachalam, Siddarthan |
title |
Influence of oceanographic variability on near‐shore microbial communities of the sub‐Antarctic Prince Edward Islands |
title_short |
Influence of oceanographic variability on near‐shore microbial communities of the sub‐Antarctic Prince Edward Islands |
title_full |
Influence of oceanographic variability on near‐shore microbial communities of the sub‐Antarctic Prince Edward Islands |
title_fullStr |
Influence of oceanographic variability on near‐shore microbial communities of the sub‐Antarctic Prince Edward Islands |
title_full_unstemmed |
Influence of oceanographic variability on near‐shore microbial communities of the sub‐Antarctic Prince Edward Islands |
title_sort |
influence of oceanographic variability on near‐shore microbial communities of the sub‐antarctic prince edward islands |
publisher |
Wiley |
publishDate |
2018 |
url |
http://dx.doi.org/10.1002/lno.11035 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.11035 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11035 |
long_lat |
ENVELOPE(-97.912,-97.912,59.641,59.641) |
geographic |
Antarctic The Antarctic Shore Island |
geographic_facet |
Antarctic The Antarctic Shore Island |
genre |
Antarc* Antarctic Prince Edward Islands |
genre_facet |
Antarc* Antarctic Prince Edward Islands |
op_source |
Limnology and Oceanography volume 64, issue 1, page 258-271 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/lno.11035 |
container_title |
Limnology and Oceanography |
container_volume |
64 |
container_issue |
1 |
container_start_page |
258 |
op_container_end_page |
271 |
_version_ |
1809817263607382016 |