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

Content Provider	Springer Nature Link
Author	rzagaray López, Orión C. Calderon Aguilera, Luis E. Castro Ceseña, Ana B. Hirata, Gustavo Hernández Ayón, José M.
Copyright Year	2017
Abstract	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.
Starting Page	1
Ending Page	14
Page Count	14
File Format	PDF
ISSN	01729179
Journal	Facies
Volume Number	63
Issue Number	2
e-ISSN	16124820
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2017-01-13
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Coral skeletons Reef sediments Reef diagenesis Dissolution kinetics Sedimentology Biogeosciences Geochemistry Paleontology Ecology
Content Type	Text
Resource Type	Article
Subject	Geology Stratigraphy Paleontology

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