Responses of three tropical seagrass species to CO2 enrichment
Increased atmospheric carbon dioxide leads to ocean acidification and carbon dioxide (CO₂) enrichment of seawater. Given the important ecological functions of seagrass meadows, understanding their responses to CO₂ will be critical for the management of coastal ecosystems. This study examined the phy...
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ftjamescook:oai:researchonline.jcu.edu.au:38053 2024-02-11T10:07:34+01:00 Responses of three tropical seagrass species to CO2 enrichment Ow, Y.X. Collier, C.J. Uthicke, S. 2015-05 application/pdf https://researchonline.jcu.edu.au/38053/1/38053_Ow_etal_2015.pdf unknown Springer http://dx.doi.org/10.1007/s00227-015-2644-6 https://researchonline.jcu.edu.au/38053/ https://researchonline.jcu.edu.au/38053/1/38053_Ow_etal_2015.pdf Ow, Y.X., Collier, C.J., and Uthicke, S. (2015) Responses of three tropical seagrass species to CO2 enrichment. Marine Biology, 162 (5). pp. 1005-1017. restricted Article PeerReviewed 2015 ftjamescook https://doi.org/10.1007/s00227-015-2644-6 2024-01-22T23:35:07Z Increased atmospheric carbon dioxide leads to ocean acidification and carbon dioxide (CO₂) enrichment of seawater. Given the important ecological functions of seagrass meadows, understanding their responses to CO₂ will be critical for the management of coastal ecosystems. This study examined the physiological responses of three tropical seagrasses to a range of seawater pCO₂ levels in a laboratory. Cymodocea serrulata, Halodule uninervis and Thalassia hemprichii were exposed to four different pCO₂ treatments (442–1204 μatm) for 2 weeks, approximating the range of end-of-century emission scenarios. Photosynthetic responses were quantified using optode-based oxygen flux measurements. Across all three species, net productivity and energetic surplus (P G:R) significantly increased with a rise in pCO₂ (linear models, P < 0.05). Photosynthesis–irradiance curve-derived photosynthetic parameters—maximum photosynthetic rates (P max) and efficiency (α)—also increased as pCO₂ increased (linear models, P < 0.05). The response for productivity measures was similar across species, i.e. similar slopes in linear models. A decrease in compensation light requirement (E c) with increasing pCO₂ was evident in C. serrulata and H. uninervis, but not in T. hemprichii. Despite higher productivity with pCO₂ enrichment, leaf growth rates in C. serrulata did not increase, while those in H. uninervis and T. hemprichii significantly increased with increasing pCO₂ levels. While seagrasses can be carbon-limited and productivity can respond positively to CO₂ enrichment, varying carbon allocation strategies amongst species suggest differential growth response between species. Thus, future increase in seawater CO₂ concentration may lead to an overall increase in seagrass biomass and productivity, as well as community changes in seagrass meadows. Article in Journal/Newspaper Ocean acidification James Cook University, Australia: ResearchOnline@JCU Marine Biology 162 5 1005 1017 |
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James Cook University, Australia: ResearchOnline@JCU |
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ftjamescook |
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description |
Increased atmospheric carbon dioxide leads to ocean acidification and carbon dioxide (CO₂) enrichment of seawater. Given the important ecological functions of seagrass meadows, understanding their responses to CO₂ will be critical for the management of coastal ecosystems. This study examined the physiological responses of three tropical seagrasses to a range of seawater pCO₂ levels in a laboratory. Cymodocea serrulata, Halodule uninervis and Thalassia hemprichii were exposed to four different pCO₂ treatments (442–1204 μatm) for 2 weeks, approximating the range of end-of-century emission scenarios. Photosynthetic responses were quantified using optode-based oxygen flux measurements. Across all three species, net productivity and energetic surplus (P G:R) significantly increased with a rise in pCO₂ (linear models, P < 0.05). Photosynthesis–irradiance curve-derived photosynthetic parameters—maximum photosynthetic rates (P max) and efficiency (α)—also increased as pCO₂ increased (linear models, P < 0.05). The response for productivity measures was similar across species, i.e. similar slopes in linear models. A decrease in compensation light requirement (E c) with increasing pCO₂ was evident in C. serrulata and H. uninervis, but not in T. hemprichii. Despite higher productivity with pCO₂ enrichment, leaf growth rates in C. serrulata did not increase, while those in H. uninervis and T. hemprichii significantly increased with increasing pCO₂ levels. While seagrasses can be carbon-limited and productivity can respond positively to CO₂ enrichment, varying carbon allocation strategies amongst species suggest differential growth response between species. Thus, future increase in seawater CO₂ concentration may lead to an overall increase in seagrass biomass and productivity, as well as community changes in seagrass meadows. |
format |
Article in Journal/Newspaper |
author |
Ow, Y.X. Collier, C.J. Uthicke, S. |
spellingShingle |
Ow, Y.X. Collier, C.J. Uthicke, S. Responses of three tropical seagrass species to CO2 enrichment |
author_facet |
Ow, Y.X. Collier, C.J. Uthicke, S. |
author_sort |
Ow, Y.X. |
title |
Responses of three tropical seagrass species to CO2 enrichment |
title_short |
Responses of three tropical seagrass species to CO2 enrichment |
title_full |
Responses of three tropical seagrass species to CO2 enrichment |
title_fullStr |
Responses of three tropical seagrass species to CO2 enrichment |
title_full_unstemmed |
Responses of three tropical seagrass species to CO2 enrichment |
title_sort |
responses of three tropical seagrass species to co2 enrichment |
publisher |
Springer |
publishDate |
2015 |
url |
https://researchonline.jcu.edu.au/38053/1/38053_Ow_etal_2015.pdf |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
http://dx.doi.org/10.1007/s00227-015-2644-6 https://researchonline.jcu.edu.au/38053/ https://researchonline.jcu.edu.au/38053/1/38053_Ow_etal_2015.pdf Ow, Y.X., Collier, C.J., and Uthicke, S. (2015) Responses of three tropical seagrass species to CO2 enrichment. Marine Biology, 162 (5). pp. 1005-1017. |
op_rights |
restricted |
op_doi |
https://doi.org/10.1007/s00227-015-2644-6 |
container_title |
Marine Biology |
container_volume |
162 |
container_issue |
5 |
container_start_page |
1005 |
op_container_end_page |
1017 |
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1790606193176084480 |