Skeletal dissolution kinetics and mechanical tests in response to morphology among coral genera

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• 作者：Orión C. Norzagaray-López ; Luis E. Calderon-Aguilera ; Ana B. Castro-Ceseña…
• 关键词：Coral skeletons ; Reef sediments ; Reef diagenesis ; Dissolution kinetics
• 刊名：Facies
• 出版年：2017
• 出版时间：April 2017
• 年：2017
• 卷：63
• 期：2
• 全文大小：
• 刊物类别：Earth and Environmental Science
• 刊物主题：Sedimentology; Biogeosciences; Geochemistry; Paleontology; Ecology;
• 出版者：Springer Berlin Heidelberg
• ISSN：1612-4820
• 卷排序：63

文摘

Ocean acidification is widely accepted as a primary threat to coral reef populations. Negative physiological effects include decreased calcification rates, heightened metabolic energy expenditure, and increased dissolution of coral skeletons. However, studies on the dissolution of coral skeletons structures under ocean acidification conditions and their implications on sediments remain scarce. In this work, we examined skeletal dissolution kinetics from four of the most representative hermatypic corals of the Eastern Pacific coasts (Pocillopora, Porites, Pavona, and Psammocora). Samples were treated with a highly acidic solution for defined periods of time, and measurements of dissolved calcium ([Ca+2]) were used to evaluate the kinetics of coral skeleton dissolution. All genera tests except Porites showed a zero reaction rate. Porites exhibited a first-order reaction and a faster reaction rate than other genera. Compression strength tests and skeletal density did not correlate with reaction rate. Pavona showed greater structural strength. Porites were the most susceptible to acidic dissolution compared to other genera tested due to their morphology, i.e., possession of the largest surface area, suggesting a high vulnerability under low-pH conditions. The hierarchical response in dissolution kinetics among coral genera tested suggests that the most soluble coral might act as a buffer under ocean acidification conditions.