Contrasting effects of acidification and warming on dimethylsulfide concentrations during a temperate estuarine fall bloom mesocosm experiment
<p>The effects of ocean acidification and warming on the concentrations of dimethylsulfoniopropionate (DMSP) and dimethylsulfide (DMS) were investigated during a mesocosm experiment in the Lower St. Lawrence Estuary (LSLE) in the fall of 2014. Twelve mesocosms covering a range of pH<span cl...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2019-03-01
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| Series: | Biogeosciences |
| Online Access: | https://www.biogeosciences.net/16/1167/2019/bg-16-1167-2019.pdf |
| _version_ | 1811234990134919168 |
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| author | R. Bénard M. Levasseur M. Scarratt S. Michaud M. Starr A. Mucci G. Ferreyra G. Ferreyra M. Gosselin J.-É. Tremblay M. Lizotte G.-P. Yang |
| author_facet | R. Bénard M. Levasseur M. Scarratt S. Michaud M. Starr A. Mucci G. Ferreyra G. Ferreyra M. Gosselin J.-É. Tremblay M. Lizotte G.-P. Yang |
| author_sort | R. Bénard |
| collection | DOAJ |
| description | <p>The effects of ocean acidification and warming on the concentrations of
dimethylsulfoniopropionate (DMSP) and dimethylsulfide (DMS) were investigated
during a mesocosm experiment in the Lower St. Lawrence Estuary (LSLE) in the
fall of 2014. Twelve mesocosms covering a range of pH<span class="inline-formula"><sub>T</sub></span> (pH on the
total hydrogen ion concentration scale) from 8.0 to 7.2, corresponding to a
range of <span class="inline-formula">CO<sub>2</sub></span> partial pressures (<span class="inline-formula"><i>p</i>CO<sub>2</sub></span>) from 440
to 2900 <span class="inline-formula">µ</span>atm, at two temperatures (in situ and <span class="inline-formula">+5</span> <span class="inline-formula"><sup>∘</sup></span>C; 10
and 15 <span class="inline-formula"><sup>∘</sup></span>C) were monitored during 13 days. All mesocosms were
characterized by the rapid development of a diatom bloom dominated by
<i>Skeletonema costatum</i>, followed by its decline upon the exhaustion of
nitrate and silicic acid. Neither the acidification nor the warming resulted
in a significant impact on the abundance of bacteria over the experiment.
However, warming the water by 5 <span class="inline-formula"><sup>∘</sup></span>C resulted in a significant
increase in the average bacterial production (BP) in all 15 <span class="inline-formula"><sup>∘</sup></span>C
mesocosms as compared to 10 <span class="inline-formula"><sup>∘</sup></span>C, with no detectable effect of
<span class="inline-formula"><i>p</i>CO<sub>2</sub></span> on BP. Variations in total DMSP
(DMSP<span class="inline-formula"><sub>t</sub></span> <span class="inline-formula">=</span> particulate <span class="inline-formula">+</span> dissolved DMSP) concentrations
tracked the development of the bloom, although the rise in DMSP<span class="inline-formula"><sub>t</sub></span>
persisted for a few days after the peaks in chlorophyll <span class="inline-formula"><i>a</i></span>. Average
concentrations of DMSP<span class="inline-formula"><sub>t</sub></span> were not affected by acidification or
warming. Initially low concentrations of DMS (<span class="inline-formula"><1</span> nmol L<span class="inline-formula"><sup>−1</sup></span>)
increased to reach peak values ranging from 30 to 130 nmol L<span class="inline-formula"><sup>−1</sup></span> towards
the end of the experiment. Increasing the <span class="inline-formula"><i>p</i>CO<sub>2</sub></span> reduced the
averaged DMS concentrations by 66 % and 69 % at 10 and
15 <span class="inline-formula"><sup>∘</sup></span>C, respectively, over the duration of the experiment. On the
other hand, a 5 <span class="inline-formula"><sup>∘</sup></span>C warming increased DMS concentrations by an
average of 240 % as compared to in situ temperature, resulting in a
positive offset of the adverse <span class="inline-formula"><i>p</i>CO<sub>2</sub></span> impact. Significant
positive correlations found between bacterial production and concentrations
of DMS throughout our experiment point towards temperature-associated
enhancement of bacterial DMSP metabolism as a likely driver of the mitigating
effect of warming on the negative impact of acidification on the net
production of DMS in the LSLE and potentially the global ocean.</p> |
| first_indexed | 2024-04-12T11:43:35Z |
| format | Article |
| id | doaj.art-057c2bd32f5049d3a05a4bcca07b0b60 |
| institution | Directory Open Access Journal |
| issn | 1726-4170 1726-4189 |
| language | English |
| last_indexed | 2024-04-12T11:43:35Z |
| publishDate | 2019-03-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Biogeosciences |
| spelling | doaj.art-057c2bd32f5049d3a05a4bcca07b0b602022-12-22T03:34:26ZengCopernicus PublicationsBiogeosciences1726-41701726-41892019-03-01161167118510.5194/bg-16-1167-2019Contrasting effects of acidification and warming on dimethylsulfide concentrations during a temperate estuarine fall bloom mesocosm experimentR. Bénard0M. Levasseur1M. Scarratt2S. Michaud3M. Starr4A. Mucci5G. Ferreyra6G. Ferreyra7M. Gosselin8J.-É. Tremblay9M. Lizotte10G.-P. Yang11Département de biologie, Université Laval, 1045 avenue de la Médecine, Québec, Québec G1V 0A6, CanadaDépartement de biologie, Université Laval, 1045 avenue de la Médecine, Québec, Québec G1V 0A6, CanadaFisheries and Oceans Canada, Maurice Lamontagne Institute, P.O. Box 1000, Mont-Joli, Québec G5H 3Z4, CanadaFisheries and Oceans Canada, Maurice Lamontagne Institute, P.O. Box 1000, Mont-Joli, Québec G5H 3Z4, CanadaFisheries and Oceans Canada, Maurice Lamontagne Institute, P.O. Box 1000, Mont-Joli, Québec G5H 3Z4, CanadaDepartment of Earth and Planetary Sciences, McGill University, 3450 University Street, Montréal, Québec H3A 2A7, CanadaInstitut des sciences de la mer de Rimouski (ISMER), Université du Québec à Rimouski, 310 allée des Ursulines, Rimouski, Québec G5L 3A1, CanadaCentro Austral de Investigaciones Científicas (CADIC), Consejo Nacional de Investigaciones Científicas y Técnicas, Bernardo Houssay 200, 9410 Ushuaia, Tierra del Fuego, ArgentinaInstitut des sciences de la mer de Rimouski (ISMER), Université du Québec à Rimouski, 310 allée des Ursulines, Rimouski, Québec G5L 3A1, CanadaDépartement de biologie, Université Laval, 1045 avenue de la Médecine, Québec, Québec G1V 0A6, CanadaDépartement de biologie, Université Laval, 1045 avenue de la Médecine, Québec, Québec G1V 0A6, CanadaInstitute of Marine Chemistry, Ocean University of China, 238 Songling Road, Qingdao 266100, Shandong, China<p>The effects of ocean acidification and warming on the concentrations of dimethylsulfoniopropionate (DMSP) and dimethylsulfide (DMS) were investigated during a mesocosm experiment in the Lower St. Lawrence Estuary (LSLE) in the fall of 2014. Twelve mesocosms covering a range of pH<span class="inline-formula"><sub>T</sub></span> (pH on the total hydrogen ion concentration scale) from 8.0 to 7.2, corresponding to a range of <span class="inline-formula">CO<sub>2</sub></span> partial pressures (<span class="inline-formula"><i>p</i>CO<sub>2</sub></span>) from 440 to 2900 <span class="inline-formula">µ</span>atm, at two temperatures (in situ and <span class="inline-formula">+5</span> <span class="inline-formula"><sup>∘</sup></span>C; 10 and 15 <span class="inline-formula"><sup>∘</sup></span>C) were monitored during 13 days. All mesocosms were characterized by the rapid development of a diatom bloom dominated by <i>Skeletonema costatum</i>, followed by its decline upon the exhaustion of nitrate and silicic acid. Neither the acidification nor the warming resulted in a significant impact on the abundance of bacteria over the experiment. However, warming the water by 5 <span class="inline-formula"><sup>∘</sup></span>C resulted in a significant increase in the average bacterial production (BP) in all 15 <span class="inline-formula"><sup>∘</sup></span>C mesocosms as compared to 10 <span class="inline-formula"><sup>∘</sup></span>C, with no detectable effect of <span class="inline-formula"><i>p</i>CO<sub>2</sub></span> on BP. Variations in total DMSP (DMSP<span class="inline-formula"><sub>t</sub></span> <span class="inline-formula">=</span> particulate <span class="inline-formula">+</span> dissolved DMSP) concentrations tracked the development of the bloom, although the rise in DMSP<span class="inline-formula"><sub>t</sub></span> persisted for a few days after the peaks in chlorophyll <span class="inline-formula"><i>a</i></span>. Average concentrations of DMSP<span class="inline-formula"><sub>t</sub></span> were not affected by acidification or warming. Initially low concentrations of DMS (<span class="inline-formula"><1</span> nmol L<span class="inline-formula"><sup>−1</sup></span>) increased to reach peak values ranging from 30 to 130 nmol L<span class="inline-formula"><sup>−1</sup></span> towards the end of the experiment. Increasing the <span class="inline-formula"><i>p</i>CO<sub>2</sub></span> reduced the averaged DMS concentrations by 66 % and 69 % at 10 and 15 <span class="inline-formula"><sup>∘</sup></span>C, respectively, over the duration of the experiment. On the other hand, a 5 <span class="inline-formula"><sup>∘</sup></span>C warming increased DMS concentrations by an average of 240 % as compared to in situ temperature, resulting in a positive offset of the adverse <span class="inline-formula"><i>p</i>CO<sub>2</sub></span> impact. Significant positive correlations found between bacterial production and concentrations of DMS throughout our experiment point towards temperature-associated enhancement of bacterial DMSP metabolism as a likely driver of the mitigating effect of warming on the negative impact of acidification on the net production of DMS in the LSLE and potentially the global ocean.</p>https://www.biogeosciences.net/16/1167/2019/bg-16-1167-2019.pdf |
| spellingShingle | R. Bénard M. Levasseur M. Scarratt S. Michaud M. Starr A. Mucci G. Ferreyra G. Ferreyra M. Gosselin J.-É. Tremblay M. Lizotte G.-P. Yang Contrasting effects of acidification and warming on dimethylsulfide concentrations during a temperate estuarine fall bloom mesocosm experiment Biogeosciences |
| title | Contrasting effects of acidification and warming on dimethylsulfide concentrations during a temperate estuarine fall bloom mesocosm experiment |
| title_full | Contrasting effects of acidification and warming on dimethylsulfide concentrations during a temperate estuarine fall bloom mesocosm experiment |
| title_fullStr | Contrasting effects of acidification and warming on dimethylsulfide concentrations during a temperate estuarine fall bloom mesocosm experiment |
| title_full_unstemmed | Contrasting effects of acidification and warming on dimethylsulfide concentrations during a temperate estuarine fall bloom mesocosm experiment |
| title_short | Contrasting effects of acidification and warming on dimethylsulfide concentrations during a temperate estuarine fall bloom mesocosm experiment |
| title_sort | contrasting effects of acidification and warming on dimethylsulfide concentrations during a temperate estuarine fall bloom mesocosm experiment |
| url | https://www.biogeosciences.net/16/1167/2019/bg-16-1167-2019.pdf |
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