High-Resolution Vertical Habitat Mapping of a Deep-Sea Cliff Offshore Greenland
Recent advances in deep-sea exploration with underwater vehicles have led to the discovery of vertical environments inhabited by a diverse sessile fauna. However, despite their ecological importance, vertical habitats remain poorly characterized by conventional downward-looking survey techniques. He...
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ftdoajarticles:oai:doaj.org/article:a86c553f7c5d4f7584fa9c359c97d386 2023-05-15T16:27:45+02:00 High-Resolution Vertical Habitat Mapping of a Deep-Sea Cliff Offshore Greenland Loïc Van Audenhaege Emmeline Broad Katharine R. Hendry Veerle A. I. Huvenne 2021-06-01T00:00:00Z https://doi.org/10.3389/fmars.2021.669372 https://doaj.org/article/a86c553f7c5d4f7584fa9c359c97d386 EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fmars.2021.669372/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2021.669372 https://doaj.org/article/a86c553f7c5d4f7584fa9c359c97d386 Frontiers in Marine Science, Vol 8 (2021) marine habitat mapping deep-water vertical cliff ROV multibeam echosounder terrain point cloud Greenland glacial trough Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2021 ftdoajarticles https://doi.org/10.3389/fmars.2021.669372 2022-12-31T16:24:20Z Recent advances in deep-sea exploration with underwater vehicles have led to the discovery of vertical environments inhabited by a diverse sessile fauna. However, despite their ecological importance, vertical habitats remain poorly characterized by conventional downward-looking survey techniques. Here we present a high-resolution 3-dimensional habitat map of a vertical cliff hosting a suspension-feeding community at the flank of an underwater glacial trough in the Greenland waters of the Labrador Sea. Using a forward-looking set-up on a Remotely Operated Vehicle (ROV), a high-resolution multibeam echosounder was used to map out the topography of the deep-sea terrain, including, for the first time, the backscatter intensity. Navigational accuracy was improved through a combination of the USBL and the DVL navigation of the ROV. Multi-scale terrain descriptors were derived and assigned to the 3D point cloud of the terrain. Following an unsupervised habitat mapping approach, the application of a K-means clustering revealed four potential habitat types, driven by geomorphology, backscatter and fine-scale features. Using groundtruthing seabed images, the ecological significance of the four habitat clusters was assessed in order to evaluate the benefit of unsupervised habitat mapping for further fine-scale ecological studies of vertical environments. This study demonstrates the importance of a priori knowledge of the terrain around habitats that are rarely explored for ecological investigations. It also emphasizes the importance of remote characterization of habitat distribution for assessing the representativeness of benthic faunal studies often constrained by time-limited sampling activities. This case study further identifies current limitations (e.g., navigation accuracy, irregular terrain acquisition difficulties) that can potentially limit the use of deep-sea terrain models for fine-scale investigations. Article in Journal/Newspaper Greenland Labrador Sea Directory of Open Access Journals: DOAJ Articles Greenland Frontiers in Marine Science 8 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
marine habitat mapping deep-water vertical cliff ROV multibeam echosounder terrain point cloud Greenland glacial trough Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
marine habitat mapping deep-water vertical cliff ROV multibeam echosounder terrain point cloud Greenland glacial trough Science Q General. Including nature conservation geographical distribution QH1-199.5 Loïc Van Audenhaege Emmeline Broad Katharine R. Hendry Veerle A. I. Huvenne High-Resolution Vertical Habitat Mapping of a Deep-Sea Cliff Offshore Greenland |
topic_facet |
marine habitat mapping deep-water vertical cliff ROV multibeam echosounder terrain point cloud Greenland glacial trough Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
Recent advances in deep-sea exploration with underwater vehicles have led to the discovery of vertical environments inhabited by a diverse sessile fauna. However, despite their ecological importance, vertical habitats remain poorly characterized by conventional downward-looking survey techniques. Here we present a high-resolution 3-dimensional habitat map of a vertical cliff hosting a suspension-feeding community at the flank of an underwater glacial trough in the Greenland waters of the Labrador Sea. Using a forward-looking set-up on a Remotely Operated Vehicle (ROV), a high-resolution multibeam echosounder was used to map out the topography of the deep-sea terrain, including, for the first time, the backscatter intensity. Navigational accuracy was improved through a combination of the USBL and the DVL navigation of the ROV. Multi-scale terrain descriptors were derived and assigned to the 3D point cloud of the terrain. Following an unsupervised habitat mapping approach, the application of a K-means clustering revealed four potential habitat types, driven by geomorphology, backscatter and fine-scale features. Using groundtruthing seabed images, the ecological significance of the four habitat clusters was assessed in order to evaluate the benefit of unsupervised habitat mapping for further fine-scale ecological studies of vertical environments. This study demonstrates the importance of a priori knowledge of the terrain around habitats that are rarely explored for ecological investigations. It also emphasizes the importance of remote characterization of habitat distribution for assessing the representativeness of benthic faunal studies often constrained by time-limited sampling activities. This case study further identifies current limitations (e.g., navigation accuracy, irregular terrain acquisition difficulties) that can potentially limit the use of deep-sea terrain models for fine-scale investigations. |
format |
Article in Journal/Newspaper |
author |
Loïc Van Audenhaege Emmeline Broad Katharine R. Hendry Veerle A. I. Huvenne |
author_facet |
Loïc Van Audenhaege Emmeline Broad Katharine R. Hendry Veerle A. I. Huvenne |
author_sort |
Loïc Van Audenhaege |
title |
High-Resolution Vertical Habitat Mapping of a Deep-Sea Cliff Offshore Greenland |
title_short |
High-Resolution Vertical Habitat Mapping of a Deep-Sea Cliff Offshore Greenland |
title_full |
High-Resolution Vertical Habitat Mapping of a Deep-Sea Cliff Offshore Greenland |
title_fullStr |
High-Resolution Vertical Habitat Mapping of a Deep-Sea Cliff Offshore Greenland |
title_full_unstemmed |
High-Resolution Vertical Habitat Mapping of a Deep-Sea Cliff Offshore Greenland |
title_sort |
high-resolution vertical habitat mapping of a deep-sea cliff offshore greenland |
publisher |
Frontiers Media S.A. |
publishDate |
2021 |
url |
https://doi.org/10.3389/fmars.2021.669372 https://doaj.org/article/a86c553f7c5d4f7584fa9c359c97d386 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Labrador Sea |
genre_facet |
Greenland Labrador Sea |
op_source |
Frontiers in Marine Science, Vol 8 (2021) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fmars.2021.669372/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2021.669372 https://doaj.org/article/a86c553f7c5d4f7584fa9c359c97d386 |
op_doi |
https://doi.org/10.3389/fmars.2021.669372 |
container_title |
Frontiers in Marine Science |
container_volume |
8 |
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1766017272694964224 |