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Seafloor ecological functioning over two decades of organic enrichment

Caswell, Bryony A.; Paine, Miranda; Frid, Christopher L J; Frid, Christopher L.J.


Miranda Paine

Christopher L J Frid

Christopher L.J. Frid


Climate change and anthropogenic nutrient enrichment are driving rapid increases in ocean deoxygenation, these changes cause biodiversity loss and have severe consequences for marine ecosystem functioning and in turn the delivery of ecosystem services upon which humanity depends (e.g. fisheries). We seek to understand how such changes will impact seafloor functioning using biological traits analysis. Results from a sewage-sludge disposal site in the Firth of Clyde, UK spanning 26 years of monitoring showed that substantial changes in macrobenthic nutrient cycling and the provision of food for predators occurred, with elevated functioning on the margins 1–2 km from the centre of the disposal grounds. Changes in food-web dynamics are expected, that weaken benthic pelagic coupling and lower secondary production (such as fisheries). Generally, functioning was conserved, but declined below a ~6% total organic carbon threshold. Similar to other severely deoxygenated systems, the recovery was slow and hysteresis was apparent.

Journal Article Type Article
Publication Date Nov 1, 2018
Journal UK. c School of Environmental Sciences
Print ISSN 0025-326X
Electronic ISSN 1879-3363
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 136
Pages 212-229
APA6 Citation Caswell, B. A., Paine, M., & Frid, C. L. (2018). Seafloor ecological functioning over two decades of organic enrichment. Marine pollution bulletin, 136, 212-229.
Keywords Sewage; Deoxygenation; Hypoxia; Ecological functioning; Long-term change
Publisher URL
Additional Information This article is maintained by: Elsevier; Article Title: Seafloor ecological functioning over two decades of organic enrichment; Journal Title: Marine Pollution Bulletin; CrossRef DOI link to publisher maintained version:; Content Type: article; Copyright: © 2018 Elsevier Ltd. All rights reserved.


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Copyright Statement
© 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license

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