Membrane lipid sensitivity to ocean warming and acidification poses a severe threat to Arctic pteropods
Ocean warming and acidification will be most pronounced in the Arctic. Both phenomena severely threaten thecosome pteropods (holoplanktonic marine gastropods) by reducing their survival (warming) and causing the dissolution of their aragonitic shell (acidification). Lipids, particularly phospholipid...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2022-08-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2022.920163/full |
| _version_ | 1798004165058756608 |
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| author | Silke Lischka Michael J. Greenacre Ulf Riebesell Martin Graeve |
| author_facet | Silke Lischka Michael J. Greenacre Ulf Riebesell Martin Graeve |
| author_sort | Silke Lischka |
| collection | DOAJ |
| description | Ocean warming and acidification will be most pronounced in the Arctic. Both phenomena severely threaten thecosome pteropods (holoplanktonic marine gastropods) by reducing their survival (warming) and causing the dissolution of their aragonitic shell (acidification). Lipids, particularly phospholipids, play a major role in veligers and juveniles of the polar thecosome pteropod Limacina helicina comprising more than two-thirds of their total lipids. Membrane lipids (phospholipids) are important for the temperature acclimation of ectotherms. Hence, we experimentally investigated ocean warming and acidification effects on total lipids, lipid classes, and fatty acids of Arctic early-stage L. helicina. The temperature and pCO2 treatments chosen resembled Representative Concentration Pathway model scenarios for this century. We found a massive decrease in total lipids at elevated temperatures and at the highest CO2 concentration (1,100 μatm) of the in situ temperature. Clearly, temperature was the overriding factor. Total lipids were reduced by 47%–70%, mainly caused by a reduction of phospholipids by up to 60%. Further, based on pHT development in the incubation water of pteropods during the experiment, some evidence exists for metabolic downregulation in pteropods at high factor levels of temperature and pCO2. Consequently, the cell differentiation and energy balance of early-stage larvae were probably severely compromised. Comparison of our experimental with ‘wild’ organisms suggests phospholipid reduction to values clearly outside natural variability. Based on the well-known significance of phospholipids for membranogenesis, early development, and reproduction, negative warming effects on such a basal metabolic function may be a much more immediate threat for pteropods than so far anticipated shell dissolution effects due to acidification. |
| first_indexed | 2024-04-11T12:19:19Z |
| format | Article |
| id | doaj.art-76344637068e41228d1734d809acc35e |
| institution | Directory Open Access Journal |
| issn | 2296-7745 |
| language | English |
| last_indexed | 2024-04-11T12:19:19Z |
| publishDate | 2022-08-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj.art-76344637068e41228d1734d809acc35e2022-12-22T04:24:07ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452022-08-01910.3389/fmars.2022.920163920163Membrane lipid sensitivity to ocean warming and acidification poses a severe threat to Arctic pteropodsSilke Lischka0Michael J. Greenacre1Ulf Riebesell2Martin Graeve3GEOMAR Helmholtz Centre for Ocean Research Kiel, Biological Oceanography, Kiel, GermanyDepartament d’Economia i Empresa, Universitat Pompeu Fabra and Barcelona School of Management, Barcelona, SpainGEOMAR Helmholtz Centre for Ocean Research Kiel, Biological Oceanography, Kiel, GermanyAlfred Wegener Institute Helmholtz Centre for Polar and Marine Science, Ecological Chemistry, Bremerhaven, GermanyOcean warming and acidification will be most pronounced in the Arctic. Both phenomena severely threaten thecosome pteropods (holoplanktonic marine gastropods) by reducing their survival (warming) and causing the dissolution of their aragonitic shell (acidification). Lipids, particularly phospholipids, play a major role in veligers and juveniles of the polar thecosome pteropod Limacina helicina comprising more than two-thirds of their total lipids. Membrane lipids (phospholipids) are important for the temperature acclimation of ectotherms. Hence, we experimentally investigated ocean warming and acidification effects on total lipids, lipid classes, and fatty acids of Arctic early-stage L. helicina. The temperature and pCO2 treatments chosen resembled Representative Concentration Pathway model scenarios for this century. We found a massive decrease in total lipids at elevated temperatures and at the highest CO2 concentration (1,100 μatm) of the in situ temperature. Clearly, temperature was the overriding factor. Total lipids were reduced by 47%–70%, mainly caused by a reduction of phospholipids by up to 60%. Further, based on pHT development in the incubation water of pteropods during the experiment, some evidence exists for metabolic downregulation in pteropods at high factor levels of temperature and pCO2. Consequently, the cell differentiation and energy balance of early-stage larvae were probably severely compromised. Comparison of our experimental with ‘wild’ organisms suggests phospholipid reduction to values clearly outside natural variability. Based on the well-known significance of phospholipids for membranogenesis, early development, and reproduction, negative warming effects on such a basal metabolic function may be a much more immediate threat for pteropods than so far anticipated shell dissolution effects due to acidification.https://www.frontiersin.org/articles/10.3389/fmars.2022.920163/fullocean warmingocean acidificationarcticpteropodslipids |
| spellingShingle | Silke Lischka Michael J. Greenacre Ulf Riebesell Martin Graeve Membrane lipid sensitivity to ocean warming and acidification poses a severe threat to Arctic pteropods Frontiers in Marine Science ocean warming ocean acidification arctic pteropods lipids |
| title | Membrane lipid sensitivity to ocean warming and acidification poses a severe threat to Arctic pteropods |
| title_full | Membrane lipid sensitivity to ocean warming and acidification poses a severe threat to Arctic pteropods |
| title_fullStr | Membrane lipid sensitivity to ocean warming and acidification poses a severe threat to Arctic pteropods |
| title_full_unstemmed | Membrane lipid sensitivity to ocean warming and acidification poses a severe threat to Arctic pteropods |
| title_short | Membrane lipid sensitivity to ocean warming and acidification poses a severe threat to Arctic pteropods |
| title_sort | membrane lipid sensitivity to ocean warming and acidification poses a severe threat to arctic pteropods |
| topic | ocean warming ocean acidification arctic pteropods lipids |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2022.920163/full |
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