Cargando…

In situ response of Antarctic under-ice primary producers to experimentally altered pH

Elevated atmospheric CO(2) concentrations are contributing to ocean acidification (reduced seawater pH and carbonate concentrations), with potentially major ramifications for marine ecosystems and their functioning. Using a novel in situ experiment we examined impacts of reduced seawater pH on Antar...

Descripción completa

Detalles Bibliográficos
Autores principales: Cummings, Vonda J., Barr, Neill G., Budd, Rod G., Marriott, Peter M., Safi, Karl A., Lohrer, Andrew M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6465331/
https://www.ncbi.nlm.nih.gov/pubmed/30988340
http://dx.doi.org/10.1038/s41598-019-42329-0
_version_ 1783410922765680640
author Cummings, Vonda J.
Barr, Neill G.
Budd, Rod G.
Marriott, Peter M.
Safi, Karl A.
Lohrer, Andrew M.
author_facet Cummings, Vonda J.
Barr, Neill G.
Budd, Rod G.
Marriott, Peter M.
Safi, Karl A.
Lohrer, Andrew M.
author_sort Cummings, Vonda J.
collection PubMed
description Elevated atmospheric CO(2) concentrations are contributing to ocean acidification (reduced seawater pH and carbonate concentrations), with potentially major ramifications for marine ecosystems and their functioning. Using a novel in situ experiment we examined impacts of reduced seawater pH on Antarctic sea ice-associated microalgal communities, key primary producers and contributors to food webs. pH levels projected for the following decades-to-end of century (7.86, 7.75, 7.61), and ambient levels (7.99), were maintained for 15 d in under-ice incubation chambers. Light, temperature and dissolved oxygen within the chambers were logged to track diurnal variation, with pH, O(2), salinity and nutrients assessed daily. Uptake of CO(2) occurred in all treatments, with pH levels significantly elevated in the two extreme treatments. At the lowest pH, despite the utilisation of CO(2) by the productive microalgae, pH did not return to ambient levels and carbonate saturation states remained low; a potential concern for organisms utilising this under-ice habitat. However, microalgal community biomass and composition were not significantly affected and only modest productivity increases were noted, suggesting subtle or slightly positive effects on under-ice algae. This in situ information enables assessment of the influence of future ocean acidification on under-ice community characteristics in a key coastal Antarctic habitat.
format Online
Article
Text
id pubmed-6465331
institution National Center for Biotechnology Information
language English
publishDate 2019
publisher Nature Publishing Group UK
record_format MEDLINE/PubMed
spelling pubmed-64653312019-04-18 In situ response of Antarctic under-ice primary producers to experimentally altered pH Cummings, Vonda J. Barr, Neill G. Budd, Rod G. Marriott, Peter M. Safi, Karl A. Lohrer, Andrew M. Sci Rep Article Elevated atmospheric CO(2) concentrations are contributing to ocean acidification (reduced seawater pH and carbonate concentrations), with potentially major ramifications for marine ecosystems and their functioning. Using a novel in situ experiment we examined impacts of reduced seawater pH on Antarctic sea ice-associated microalgal communities, key primary producers and contributors to food webs. pH levels projected for the following decades-to-end of century (7.86, 7.75, 7.61), and ambient levels (7.99), were maintained for 15 d in under-ice incubation chambers. Light, temperature and dissolved oxygen within the chambers were logged to track diurnal variation, with pH, O(2), salinity and nutrients assessed daily. Uptake of CO(2) occurred in all treatments, with pH levels significantly elevated in the two extreme treatments. At the lowest pH, despite the utilisation of CO(2) by the productive microalgae, pH did not return to ambient levels and carbonate saturation states remained low; a potential concern for organisms utilising this under-ice habitat. However, microalgal community biomass and composition were not significantly affected and only modest productivity increases were noted, suggesting subtle or slightly positive effects on under-ice algae. This in situ information enables assessment of the influence of future ocean acidification on under-ice community characteristics in a key coastal Antarctic habitat. Nature Publishing Group UK 2019-04-15 /pmc/articles/PMC6465331/ /pubmed/30988340 http://dx.doi.org/10.1038/s41598-019-42329-0 Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Cummings, Vonda J.
Barr, Neill G.
Budd, Rod G.
Marriott, Peter M.
Safi, Karl A.
Lohrer, Andrew M.
In situ response of Antarctic under-ice primary producers to experimentally altered pH
title In situ response of Antarctic under-ice primary producers to experimentally altered pH
title_full In situ response of Antarctic under-ice primary producers to experimentally altered pH
title_fullStr In situ response of Antarctic under-ice primary producers to experimentally altered pH
title_full_unstemmed In situ response of Antarctic under-ice primary producers to experimentally altered pH
title_short In situ response of Antarctic under-ice primary producers to experimentally altered pH
title_sort in situ response of antarctic under-ice primary producers to experimentally altered ph
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6465331/
https://www.ncbi.nlm.nih.gov/pubmed/30988340
http://dx.doi.org/10.1038/s41598-019-42329-0
work_keys_str_mv AT cummingsvondaj insituresponseofantarcticundericeprimaryproducerstoexperimentallyalteredph
AT barrneillg insituresponseofantarcticundericeprimaryproducerstoexperimentallyalteredph
AT buddrodg insituresponseofantarcticundericeprimaryproducerstoexperimentallyalteredph
AT marriottpeterm insituresponseofantarcticundericeprimaryproducerstoexperimentallyalteredph
AT safikarla insituresponseofantarcticundericeprimaryproducerstoexperimentallyalteredph
AT lohrerandrewm insituresponseofantarcticundericeprimaryproducerstoexperimentallyalteredph