Effects of ocean acidification on the primary framework builders of coral reefs
Includes bibliographical references (pages 10-17) California State University, Northridge. Department of Biology. Motivated by the growing number of studies reporting inter-specific differences for the effects of OA on calcifying taxa, this study tested the hypothesis that taxonomically diverse calc...
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California State University, Northridge
2013
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Online Access: | http://hdl.handle.net/10211.2/3172 |
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California State University (CSU): DSpace |
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Millepora Hydrocoral Scleractinian Hermatypic Ocean acidification |
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Millepora Hydrocoral Scleractinian Hermatypic Ocean acidification Brown, Darren James Effects of ocean acidification on the primary framework builders of coral reefs |
topic_facet |
Millepora Hydrocoral Scleractinian Hermatypic Ocean acidification |
description |
Includes bibliographical references (pages 10-17) California State University, Northridge. Department of Biology. Motivated by the growing number of studies reporting inter-specific differences for the effects of OA on calcifying taxa, this study tested the hypothesis that taxonomically diverse calcifying cnidarians show differential responses to OA. Phylogenetic analyses show that the Scleractinia consist of two clades (Robusta and Complexa), with the split between the two occurring prior to the evolution of calcification. Further, milleporine hydrocorals arose after the Scleractinia in seas of different chemical composition. The potential for the Robusta, Complexa, and milleporines to represent different responses to OA due to independent evolution of calcification contextualized the present analysis. Scleractinians representing Robusta (Pocillopora meandrina) and Complexa (Porites spp. and Acropora pulchra) as well as the milleporine hydrocoral (Millepora platyphylla) were grown in 3 PCO2 regimes (400, 750 & 900 ??atm) crossed with 2 temperatures (28.0 & 30.1 ??C), with calcification measured after 3 weeks. Porites spp. and A. pulchra (= Complexa) and M. platyphylla were unaffected by PCO2, while calcification in P. meandrina (= Robusta) declined 33% and 55% at high PCO2 (750 & 900 ??atm respectively) and 30.1 ??C. These patterns clearly demonstrate differential responses to OA among phylogenetically diverse taxa, and raise the intriguing possibility that differential evolution of calcification could modulate the impacts of OA on these taxa. Due to differences in the response between Pocillopora meandrina and Millepora platyphylla to OA, I tested the hypothesis that the scleractinian, Pocillopora meandrina, and the hydrocoral, Millepora platyphylla, respond differently to increased PCO2 due to differential utilization of particulate food. To test this hypothesis, PCO2 treatments of 380 ??atm and 710 ??atm, were crossed with feeding treatments created through the supply of seawater filtered to ~100 ??m (control zooplankton), seawater filtered to ~2 ??m (low zooplankton), or seawater enriched with natural zooplankton (high zooplankton). M. platyphylla was unaffected by increased PCO2 at control and low zooplankton treatments, but high PCO2 increased calcification 19% in the high zooplankton treatment. P. meandrina was unaffected by increased PCO2 at the control zooplankton treatment, but increased PCO2 decreased calcification 32% and 29% for high and low zooplankton treatments, respectively. In control and low feeding treatments, calcification of M. platyphylla, may be nutrient limited, with the effect removed with additional zooplankton. P. meandrina interacts with food in different ways, as calcification was depressed by PCO2 both when additional zooplankton were supplied and when the smallest particulates were removed, but not with access to control seawater. We speculate that the differences between scleractinian and hydrocorals in their response to PCO2 as a function of food supply may reflect the evolutionary origins of these taxa in ancient seas differing in chemical composition. |
author2 |
Edmunds, Peter J. Biology Carpenter, Robert C. Dudgeon, Steven R. |
format |
Thesis |
author |
Brown, Darren James |
author_facet |
Brown, Darren James |
author_sort |
Brown, Darren James |
title |
Effects of ocean acidification on the primary framework builders of coral reefs |
title_short |
Effects of ocean acidification on the primary framework builders of coral reefs |
title_full |
Effects of ocean acidification on the primary framework builders of coral reefs |
title_fullStr |
Effects of ocean acidification on the primary framework builders of coral reefs |
title_full_unstemmed |
Effects of ocean acidification on the primary framework builders of coral reefs |
title_sort |
effects of ocean acidification on the primary framework builders of coral reefs |
publisher |
California State University, Northridge |
publishDate |
2013 |
url |
http://hdl.handle.net/10211.2/3172 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
http://hdl.handle.net/10211.2/3172 |
op_rights |
http://scholarworks.csun.edu/xmlui/handle/10211.2/286 By signing and submitting this license, you the author grant permission to CSUN Graduate Studies to submit your thesis or dissertation, and any additional associated files you provide, to CSUN ScholarWorks, the institutional repository of the California State University, Northridge, on your behalf. You grant to CSUN ScholarWorks the non-exclusive right to reproduce and/or distribute your submission worldwide in electronic or any medium for non-commercial, academic purposes. You agree that CSUN ScholarWorks may, without changing the content, translate the submission to any medium or format, as well as keep more than one copy, for the purposes of security, backup and preservation. You represent that the submission is your original work, and that you have the right to grant the rights contained in this license. You also represent that your submission does not, to the best of your knowledge, infringe upon anyone's copyright. If the submission contains material for which you do not hold copyright, or for which the intended use is not permitted, or which does not reasonably fall under the guidelines of fair use, you represent that you have obtained the unrestricted permission of the copyright owner to grant CSUN ScholarWorks the rights required by this license, and that such third-party owned material is clearly identified and acknowledged within the text or content of the submission. If the submission is based upon work that has been sponsored or supported by an agency or organization other than the California State University, Northridge, you represent that you have fulfilled any right of review or other obligations required by such contract or agreement. CSUN ScholarWorks will clearly identify your name(s) as the author(s) or owner(s) of the submission, and will not make any alterations, other than those allowed by this license, to your submission. |
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ftcalifstateuniv:oai:dspace.calstate.edu:10211.2/3172 2023-05-15T17:51:22+02:00 Effects of ocean acidification on the primary framework builders of coral reefs Brown, Darren James Edmunds, Peter J. Biology Carpenter, Robert C. Dudgeon, Steven R. 2013 http://hdl.handle.net/10211.2/3172 en eng California State University, Northridge http://hdl.handle.net/10211.2/3172 http://scholarworks.csun.edu/xmlui/handle/10211.2/286 By signing and submitting this license, you the author grant permission to CSUN Graduate Studies to submit your thesis or dissertation, and any additional associated files you provide, to CSUN ScholarWorks, the institutional repository of the California State University, Northridge, on your behalf. You grant to CSUN ScholarWorks the non-exclusive right to reproduce and/or distribute your submission worldwide in electronic or any medium for non-commercial, academic purposes. You agree that CSUN ScholarWorks may, without changing the content, translate the submission to any medium or format, as well as keep more than one copy, for the purposes of security, backup and preservation. You represent that the submission is your original work, and that you have the right to grant the rights contained in this license. You also represent that your submission does not, to the best of your knowledge, infringe upon anyone's copyright. If the submission contains material for which you do not hold copyright, or for which the intended use is not permitted, or which does not reasonably fall under the guidelines of fair use, you represent that you have obtained the unrestricted permission of the copyright owner to grant CSUN ScholarWorks the rights required by this license, and that such third-party owned material is clearly identified and acknowledged within the text or content of the submission. If the submission is based upon work that has been sponsored or supported by an agency or organization other than the California State University, Northridge, you represent that you have fulfilled any right of review or other obligations required by such contract or agreement. CSUN ScholarWorks will clearly identify your name(s) as the author(s) or owner(s) of the submission, and will not make any alterations, other than those allowed by this license, to your submission. Millepora Hydrocoral Scleractinian Hermatypic Ocean acidification Thesis 2013 ftcalifstateuniv 2022-04-13T11:08:40Z Includes bibliographical references (pages 10-17) California State University, Northridge. Department of Biology. Motivated by the growing number of studies reporting inter-specific differences for the effects of OA on calcifying taxa, this study tested the hypothesis that taxonomically diverse calcifying cnidarians show differential responses to OA. Phylogenetic analyses show that the Scleractinia consist of two clades (Robusta and Complexa), with the split between the two occurring prior to the evolution of calcification. Further, milleporine hydrocorals arose after the Scleractinia in seas of different chemical composition. The potential for the Robusta, Complexa, and milleporines to represent different responses to OA due to independent evolution of calcification contextualized the present analysis. Scleractinians representing Robusta (Pocillopora meandrina) and Complexa (Porites spp. and Acropora pulchra) as well as the milleporine hydrocoral (Millepora platyphylla) were grown in 3 PCO2 regimes (400, 750 & 900 ??atm) crossed with 2 temperatures (28.0 & 30.1 ??C), with calcification measured after 3 weeks. Porites spp. and A. pulchra (= Complexa) and M. platyphylla were unaffected by PCO2, while calcification in P. meandrina (= Robusta) declined 33% and 55% at high PCO2 (750 & 900 ??atm respectively) and 30.1 ??C. These patterns clearly demonstrate differential responses to OA among phylogenetically diverse taxa, and raise the intriguing possibility that differential evolution of calcification could modulate the impacts of OA on these taxa. Due to differences in the response between Pocillopora meandrina and Millepora platyphylla to OA, I tested the hypothesis that the scleractinian, Pocillopora meandrina, and the hydrocoral, Millepora platyphylla, respond differently to increased PCO2 due to differential utilization of particulate food. To test this hypothesis, PCO2 treatments of 380 ??atm and 710 ??atm, were crossed with feeding treatments created through the supply of seawater filtered to ~100 ??m (control zooplankton), seawater filtered to ~2 ??m (low zooplankton), or seawater enriched with natural zooplankton (high zooplankton). M. platyphylla was unaffected by increased PCO2 at control and low zooplankton treatments, but high PCO2 increased calcification 19% in the high zooplankton treatment. P. meandrina was unaffected by increased PCO2 at the control zooplankton treatment, but increased PCO2 decreased calcification 32% and 29% for high and low zooplankton treatments, respectively. In control and low feeding treatments, calcification of M. platyphylla, may be nutrient limited, with the effect removed with additional zooplankton. P. meandrina interacts with food in different ways, as calcification was depressed by PCO2 both when additional zooplankton were supplied and when the smallest particulates were removed, but not with access to control seawater. We speculate that the differences between scleractinian and hydrocorals in their response to PCO2 as a function of food supply may reflect the evolutionary origins of these taxa in ancient seas differing in chemical composition. Thesis Ocean acidification California State University (CSU): DSpace |