High resilience of two coastal plankton communities to 21st century seawater acidification: Evidence from microcosm studies
Increased free CO2 and ocean acidification are among the consequences of anthropogenic carbon emissions. Responses of marine protists to increased levels of CO2 are highly species-specific, and this has been suggested to cause an alteration in plankton species composition, community functions and ul...
Published in: | Marine Biology Research |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2010
|
Subjects: | |
Online Access: | https://orbit.dtu.dk/en/publications/273cda52-7500-4c90-a7b6-562c71f47af0 https://doi.org/10.1080/17451000903476941 |
id |
ftdtupubl:oai:pure.atira.dk:publications/273cda52-7500-4c90-a7b6-562c71f47af0 |
---|---|
record_format |
openpolar |
spelling |
ftdtupubl:oai:pure.atira.dk:publications/273cda52-7500-4c90-a7b6-562c71f47af0 2024-05-19T07:46:39+00:00 High resilience of two coastal plankton communities to 21st century seawater acidification: Evidence from microcosm studies Nielsen, Lasse Tor Jakobsen, Hans Henrik Hansen, Per Juul 2010 https://orbit.dtu.dk/en/publications/273cda52-7500-4c90-a7b6-562c71f47af0 https://doi.org/10.1080/17451000903476941 eng eng https://orbit.dtu.dk/en/publications/273cda52-7500-4c90-a7b6-562c71f47af0 info:eu-repo/semantics/restrictedAccess Nielsen , L T , Jakobsen , H H & Hansen , P J 2010 , ' High resilience of two coastal plankton communities to 21st century seawater acidification: Evidence from microcosm studies ' , Marine Biology Research , vol. 6 , no. 6 , pp. 542-555 . https://doi.org/10.1080/17451000903476941 FlowCAM and pH species composition Climate change pigment analysis seawater acidification /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water article 2010 ftdtupubl https://doi.org/10.1080/17451000903476941 2024-05-01T00:16:02Z Increased free CO2 and ocean acidification are among the consequences of anthropogenic carbon emissions. Responses of marine protists to increased levels of CO2 are highly species-specific, and this has been suggested to cause an alteration in plankton species composition, community functions and ultimately biogeochemical cycles. This study aims to test this by performing microcosm incubation experiments at present (pH 8.0) and at three lowered pH levels (pH 7.8, 7.6 and 6.0), corresponding to free CO2 concentrations of 24, 38, 58 & 610 µmol l-1, respectively. Results from two such experiments are reported, and measurements include microscopy counts of ~20 planktonic protist taxa, HPLC pigment analysis, FlowCAM analysis of cell-size spectra, photosynthetic activity and total POC and PON. Initial communities were flagellate (experiment 1) and dinoflagellate and ciliate (experiment 2) dominated, but at pH 8.0, 7.8 and 7.6 a diatom dominance developed during the first days in both experiments. Profound changes in all measured parameters were found as a result of the pH 6.0 treatment, but among the other three pH treatments significant differences were few; Karlodinium spp. was the only taxon to be affected significantly, and plankton group composition, cell sizes and photosynthetic activity all remained unaffected during the 14-day incubation periods. Thus, both of the investigated coastal plankton communities were unaffected by twenty-first century expected changes in pH and free CO2. This may be explained by the large seasonal, and even daily, changes in pH seen in productive marine ecosystems, and the corresponding need for algae to be pH-tolerant. Article in Journal/Newspaper Ocean acidification Technical University of Denmark: DTU Orbit Marine Biology Research 6 6 542 555 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
FlowCAM and pH species composition Climate change pigment analysis seawater acidification /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
spellingShingle |
FlowCAM and pH species composition Climate change pigment analysis seawater acidification /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water Nielsen, Lasse Tor Jakobsen, Hans Henrik Hansen, Per Juul High resilience of two coastal plankton communities to 21st century seawater acidification: Evidence from microcosm studies |
topic_facet |
FlowCAM and pH species composition Climate change pigment analysis seawater acidification /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
description |
Increased free CO2 and ocean acidification are among the consequences of anthropogenic carbon emissions. Responses of marine protists to increased levels of CO2 are highly species-specific, and this has been suggested to cause an alteration in plankton species composition, community functions and ultimately biogeochemical cycles. This study aims to test this by performing microcosm incubation experiments at present (pH 8.0) and at three lowered pH levels (pH 7.8, 7.6 and 6.0), corresponding to free CO2 concentrations of 24, 38, 58 & 610 µmol l-1, respectively. Results from two such experiments are reported, and measurements include microscopy counts of ~20 planktonic protist taxa, HPLC pigment analysis, FlowCAM analysis of cell-size spectra, photosynthetic activity and total POC and PON. Initial communities were flagellate (experiment 1) and dinoflagellate and ciliate (experiment 2) dominated, but at pH 8.0, 7.8 and 7.6 a diatom dominance developed during the first days in both experiments. Profound changes in all measured parameters were found as a result of the pH 6.0 treatment, but among the other three pH treatments significant differences were few; Karlodinium spp. was the only taxon to be affected significantly, and plankton group composition, cell sizes and photosynthetic activity all remained unaffected during the 14-day incubation periods. Thus, both of the investigated coastal plankton communities were unaffected by twenty-first century expected changes in pH and free CO2. This may be explained by the large seasonal, and even daily, changes in pH seen in productive marine ecosystems, and the corresponding need for algae to be pH-tolerant. |
format |
Article in Journal/Newspaper |
author |
Nielsen, Lasse Tor Jakobsen, Hans Henrik Hansen, Per Juul |
author_facet |
Nielsen, Lasse Tor Jakobsen, Hans Henrik Hansen, Per Juul |
author_sort |
Nielsen, Lasse Tor |
title |
High resilience of two coastal plankton communities to 21st century seawater acidification: Evidence from microcosm studies |
title_short |
High resilience of two coastal plankton communities to 21st century seawater acidification: Evidence from microcosm studies |
title_full |
High resilience of two coastal plankton communities to 21st century seawater acidification: Evidence from microcosm studies |
title_fullStr |
High resilience of two coastal plankton communities to 21st century seawater acidification: Evidence from microcosm studies |
title_full_unstemmed |
High resilience of two coastal plankton communities to 21st century seawater acidification: Evidence from microcosm studies |
title_sort |
high resilience of two coastal plankton communities to 21st century seawater acidification: evidence from microcosm studies |
publishDate |
2010 |
url |
https://orbit.dtu.dk/en/publications/273cda52-7500-4c90-a7b6-562c71f47af0 https://doi.org/10.1080/17451000903476941 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Nielsen , L T , Jakobsen , H H & Hansen , P J 2010 , ' High resilience of two coastal plankton communities to 21st century seawater acidification: Evidence from microcosm studies ' , Marine Biology Research , vol. 6 , no. 6 , pp. 542-555 . https://doi.org/10.1080/17451000903476941 |
op_relation |
https://orbit.dtu.dk/en/publications/273cda52-7500-4c90-a7b6-562c71f47af0 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1080/17451000903476941 |
container_title |
Marine Biology Research |
container_volume |
6 |
container_issue |
6 |
container_start_page |
542 |
op_container_end_page |
555 |
_version_ |
1799486877224402944 |