Ocean acidification changes the structure of an Antarctic coastal protistan community
Antarctic near-shore waters are amongst the most sensitive in the world to ocean acidification. Microbes occupying these waters are critical drivers of ecosystem productivity, elemental cycling and ocean biogeochemistry, yet little is known about their sensitivity to ocean acidification. A six-level...
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Online Access: | https://doi.org/10.5194/bg-15-2393-2018 http://ecite.utas.edu.au/129023 |
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ftunivtasecite:oai:ecite.utas.edu.au:129023 2023-05-15T13:55:18+02:00 Ocean acidification changes the structure of an Antarctic coastal protistan community Hancock, AM Davidson, AT McKinlay, J McMinn, A Schulz, KG van den Enden, RL 2018 application/pdf https://doi.org/10.5194/bg-15-2393-2018 http://ecite.utas.edu.au/129023 en eng Copernicus GmbH http://ecite.utas.edu.au/129023/1/129023 - Ocean acidification changes in the structure of an Antarctic.pdf http://dx.doi.org/10.5194/bg-15-2393-2018 Hancock, AM and Davidson, AT and McKinlay, J and McMinn, A and Schulz, KG and van den Enden, RL, Ocean acidification changes the structure of an Antarctic coastal protistan community, Biogeosciences, 15, (8) pp. 2393-2410. ISSN 1726-4170 (2018) [Refereed Article] http://ecite.utas.edu.au/129023 Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) Refereed Article PeerReviewed 2018 ftunivtasecite https://doi.org/10.5194/bg-15-2393-2018 2019-12-13T22:27:11Z Antarctic near-shore waters are amongst the most sensitive in the world to ocean acidification. Microbes occupying these waters are critical drivers of ecosystem productivity, elemental cycling and ocean biogeochemistry, yet little is known about their sensitivity to ocean acidification. A six-level, doseresponse experiment was conducted using 650 L incubation tanks (minicosms) adjusted to a gradient in fugacity of carbon dioxide ( f CO 2 ) from 343 to 1641 atm. The six minicosms were filled with near-shore water from Prydz Bay, East Antarctica, and the protistan composition and abundance was determined by microscopy during 18days of incubation. No CO 2 -related change in the protistan community composition was observed during the initial 8day acclimation period under low light. Thereafter, the response of both autotrophic and heterotrophic protists to f CO 2 was species-specific. The response of diatoms was mainly cell size related; microplanktonic diatoms ( > 20 m) increased in abundance with low to moderate f CO 2 (343634 atm) but decreased at f CO 2 ≥ 953 atm. Similarly, the abundance of Phaeocystis antarctica increased with increasing f CO 2 peaking at 634 atm. Above this threshold the abundance of micro-sized diatoms and P.antarctica fell dramatically, and nanoplanktonic diatoms ( ≤ 20 m) dominated, therefore culminating in a significant change in the protistan community composition. Comparisons of these results with previous experiments conducted at this site show that the f CO 2 thresholds are similar, despite seasonal and interannual differences in the physical and biotic environment. This suggests that near-shore microbial communities are likely to change significantly near the end of this century if anthropogenic CO 2 release continues unabated, with profound ramifications for near-shore Antarctic ecosystem food webs and biogeochemical cycling. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ocean acidification Prydz Bay eCite UTAS (University of Tasmania) Antarctic East Antarctica Prydz Bay Biogeosciences 15 8 2393 2410 |
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) Hancock, AM Davidson, AT McKinlay, J McMinn, A Schulz, KG van den Enden, RL Ocean acidification changes the structure of an Antarctic coastal protistan community |
topic_facet |
Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) |
description |
Antarctic near-shore waters are amongst the most sensitive in the world to ocean acidification. Microbes occupying these waters are critical drivers of ecosystem productivity, elemental cycling and ocean biogeochemistry, yet little is known about their sensitivity to ocean acidification. A six-level, doseresponse experiment was conducted using 650 L incubation tanks (minicosms) adjusted to a gradient in fugacity of carbon dioxide ( f CO 2 ) from 343 to 1641 atm. The six minicosms were filled with near-shore water from Prydz Bay, East Antarctica, and the protistan composition and abundance was determined by microscopy during 18days of incubation. No CO 2 -related change in the protistan community composition was observed during the initial 8day acclimation period under low light. Thereafter, the response of both autotrophic and heterotrophic protists to f CO 2 was species-specific. The response of diatoms was mainly cell size related; microplanktonic diatoms ( > 20 m) increased in abundance with low to moderate f CO 2 (343634 atm) but decreased at f CO 2 ≥ 953 atm. Similarly, the abundance of Phaeocystis antarctica increased with increasing f CO 2 peaking at 634 atm. Above this threshold the abundance of micro-sized diatoms and P.antarctica fell dramatically, and nanoplanktonic diatoms ( ≤ 20 m) dominated, therefore culminating in a significant change in the protistan community composition. Comparisons of these results with previous experiments conducted at this site show that the f CO 2 thresholds are similar, despite seasonal and interannual differences in the physical and biotic environment. This suggests that near-shore microbial communities are likely to change significantly near the end of this century if anthropogenic CO 2 release continues unabated, with profound ramifications for near-shore Antarctic ecosystem food webs and biogeochemical cycling. |
format |
Article in Journal/Newspaper |
author |
Hancock, AM Davidson, AT McKinlay, J McMinn, A Schulz, KG van den Enden, RL |
author_facet |
Hancock, AM Davidson, AT McKinlay, J McMinn, A Schulz, KG van den Enden, RL |
author_sort |
Hancock, AM |
title |
Ocean acidification changes the structure of an Antarctic coastal protistan community |
title_short |
Ocean acidification changes the structure of an Antarctic coastal protistan community |
title_full |
Ocean acidification changes the structure of an Antarctic coastal protistan community |
title_fullStr |
Ocean acidification changes the structure of an Antarctic coastal protistan community |
title_full_unstemmed |
Ocean acidification changes the structure of an Antarctic coastal protistan community |
title_sort |
ocean acidification changes the structure of an antarctic coastal protistan community |
publisher |
Copernicus GmbH |
publishDate |
2018 |
url |
https://doi.org/10.5194/bg-15-2393-2018 http://ecite.utas.edu.au/129023 |
geographic |
Antarctic East Antarctica Prydz Bay |
geographic_facet |
Antarctic East Antarctica Prydz Bay |
genre |
Antarc* Antarctic Antarctica East Antarctica Ocean acidification Prydz Bay |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ocean acidification Prydz Bay |
op_relation |
http://ecite.utas.edu.au/129023/1/129023 - Ocean acidification changes in the structure of an Antarctic.pdf http://dx.doi.org/10.5194/bg-15-2393-2018 Hancock, AM and Davidson, AT and McKinlay, J and McMinn, A and Schulz, KG and van den Enden, RL, Ocean acidification changes the structure of an Antarctic coastal protistan community, Biogeosciences, 15, (8) pp. 2393-2410. ISSN 1726-4170 (2018) [Refereed Article] http://ecite.utas.edu.au/129023 |
op_doi |
https://doi.org/10.5194/bg-15-2393-2018 |
container_title |
Biogeosciences |
container_volume |
15 |
container_issue |
8 |
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2393 |
op_container_end_page |
2410 |
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1766261684708573184 |