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http://hdl.handle.net/10397/106450
Title: | Calcium carbonate unit realignment under acidification : a potential compensatory mechanism in an edible estuarine oyster | Authors: | Meng, Y Guo, Z Yao, H Yeung, KWK Thiyagarajan, V |
Issue Date: | Feb-2019 | Source: | Marine pollution bulletin, Feb. 2019, v. 139, p. 141-149 | Abstract: | Ocean acidification (OA) is well-known for impairing marine calcification; however, the end response of several essential species to this perturbation remains unknown. Decreased pH and saturation levels (Ω) of minerals under OA is projected to alter shell crystallography and thus to reduce shell mechanical properties. This study examined this hypothesis using a commercially important estuarine oyster Magallana hongkongensis. Although shell damage occurred on the outmost prismatic layer and the undying myostracum at decreased pH 7.6 and 7.3, the major foliated layer was relatively unharmed. Oysters maintained their shell hardness and stiffness through altered crystal unit orientation under pH 7.6 conditions. However, under the undersaturated conditions (ΩCal ~ 0.8) at pH 7.3, the realigned crystal units in foliated layer ultimately resulted in less stiff shells which indicated although estuarine oysters are mechanically resistant to unfavorable calcification conditions, extremely low pH condition is still a threat to this essential species. | Keywords: | Calcification Compensatory mechanism Crystallography Mechanical property Ocean acidification Oyster shells |
Publisher: | Elsevier Ltd | Journal: | Marine pollution bulletin | ISSN: | 0025-326X | EISSN: | 1879-3363 | DOI: | 10.1016/j.marpolbul.2018.12.030 | Rights: | © 2018 Published by Elsevier Ltd. © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The following publication Meng, Y., Guo, Z., Yao, H., Yeung, K. W. K., & Thiyagarajan, V. (2019). Calcium carbonate unit realignment under acidification: A potential compensatory mechanism in an edible estuarine oyster. Marine Pollution Bulletin, 139, 141-149 is available at https://doi.org/10.1016/j.marpolbul.2018.12.030. |
Appears in Collections: | Journal/Magazine Article |
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Guo_Calcium_Carbonate_Unit.pdf | Pre-Published version | 1.9 MB | Adobe PDF | View/Open |
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