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Calcium carbonate unit realignment under acidification: A potential compensatory mechanism in an edible estuarine oyster.
- Source :
-
Marine pollution bulletin [Mar Pollut Bull] 2019 Feb; Vol. 139, pp. 141-149. Date of Electronic Publication: 2019 Jan 04. - Publication Year :
- 2019
-
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 (Ω <subscript>Cal</subscript> ~ 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.<br /> (Copyright © 2018. Published by Elsevier Ltd.)
- Subjects :
- Animal Shells ultrastructure
Animals
Biomechanical Phenomena
Calcification, Physiologic
Crystallography
Hydrogen-Ion Concentration
Microscopy, Electrochemical, Scanning
Ostrea growth & development
Ostrea ultrastructure
Animal Shells chemistry
Calcium Carbonate chemistry
Carbon Dioxide analysis
Ostrea chemistry
Seawater chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 1879-3363
- Volume :
- 139
- Database :
- MEDLINE
- Journal :
- Marine pollution bulletin
- Publication Type :
- Academic Journal
- Accession number :
- 30686412
- Full Text :
- https://doi.org/10.1016/j.marpolbul.2018.12.030