Ocean Acidification and Organic Matter Enrichment Alter Carbonate Sediment Metabolism Through Different Pathways ...

Ocean acidification (OA) and organic matter enrichment (due to coastal eutrophication) could act in concert to shift coral reef carbonate sediments from a present state of net calcification to a future state of net dissolution, but no studies have examined the combined effect of these stressors on s...

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Bibliographic Details
Main Authors: Lantz, Coulson A, Schulz, Kai Georg, Eyre, Bradley D
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA 2020
Subjects:
Benthos
Calcification/Dissolution
Coast and continental shelf
Containers and aquaria 20-1000 L or < 1 m**2
Entire community
Laboratory experiment
Other
Primary production/Photosynthesis
Respiration
Soft-bottom community
South Pacific
Temperate
Ocean Acidification International Coordination Centre OA-ICC
Ocean acidification
Online Access:https://dx.doi.org/10.1594/pangaea.905748
https://doi.pangaea.de/10.1594/PANGAEA.905748
Description
Summary:Ocean acidification (OA) and organic matter enrichment (due to coastal eutrophication) could act in concert to shift coral reef carbonate sediments from a present state of net calcification to a future state of net dissolution, but no studies have examined the combined effect of these stressors on sediment metabolism and dissolution. This study used 22-hour incubations in flume aquaria with captive sediment communities to measure the combined effect of OA and organic matter (OM) enrichment, on coral reef sediment gross primary productivity (GPP), respiration (R), and net calcification (Gnet). Relative to control sediment communities, both OA ( 1000 µatm) and OM enrichment (+ 40 µmol C/L) significantly decreased rates of sediment Gnet by 98% and 15% mmol CaCO3/m**2/h, respectively , but the mechanism behind this decrease differed. The OA-mediated transition to net dissolution was geochemical, as rates of GPP and R remained unaffected and dissolution was solely enhanced by a decline in the aragonite saturation ... : Supplement to: Lantz, Coulson A; Schulz, Kai Georg; Eyre, Bradley D (in review): Ocean Acidification and Organic Matter Enrichment Alter Carbonate Sediment Metabolism Through Different Pathways. Journal of Geophysical Research: Oceans ...

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