High resolution mapping of a cold water coral mound

Author(s)

Conti, Luis A. ^[1] ; Lim, Aaron ^{[2, 3]} ; Wheeler, Andrew J. ^{[2, 3, 4]}

Affiliation

^[1] Univ Sao Paulo, Escola Artes Ciencias & Humanidades, Sao Paulo - Brazil

^[2] Univ Coll Cork, Sch Biol Earth & Environm Sci, Cork - Ireland

^[3] Univ Coll Cork, Environm Res Inst, Cork - Ireland

^[4] Univ Coll Cork, Irish Ctr Res Appl Geosci, Marine & Renewable Energy Inst, Cork - Ireland

• Document type: Journal article
• Source: SCIENTIFIC REPORTS; v. 9, JAN 31 2019.
• Web of Science Citations: 1

Abstract

Cold-water coral (CWC) mounds are biogenic, long-lived morphostructures composed primarily by scleractinian CWC's and hemipelagic sediments that form complex deep-sea microhabitats found globally but specifically along the European-Atlantic margin. In this work, high-resolution mapping was applied to identify individual organismal distribution and zonation across a CWC Piddington Mound within the Porcupine Seabight, Ireland Margin. Marine Object-Based Image Analysis (MOBIA) and different machine learning classification methods (decision tree, logistic regression, and deep neural network) were applied to a high-resolution (2 mm) reef-scale video mosaic and ROV-mounted multibeam data in order to provide new insights into the spatial organization of coral frameworks and environmental factors on CWC mounds. The results showed an accurate quantification of the amount of Coral Framework (14.5%; similar to 2% live and similar to 12.5% dead) and sponges (similar to 3.5%) with heterogeneous distribution, restricted to a certain portion of the mound. This is the first object level quantification of live and dead coral framework facies and individual sponges across an entire CWC mound. This approach has application for habitat and conservation studies, provides a quantification tool for carbon budget assessments and can provide a baseline to assess CWC mound change. The approach can also be modified for application in other habitats. (AU)

• FAPESP's process: 17/19649-8 - Mapping, modelling and monitoring key processes and controls on cold-water coral habitats in submarine canyons (MMMonKey_Pro)
• Grantee: Luis Americo Conti
• Support Opportunities: Scholarships abroad - Research