Very few deep sea areas both in and outside of Australia have been well-sampled over large spatial and temporal scales, and a large number of species still remain undiscovered and unnamed. Following the first explorations of Bremer Bay and Perth Canyon, Falkor will bring ROV SuBastian to the Ningaloo Canyons. Dr. Nerida Wilson, of the Western Australian Museum, and her team will aim to identify and characterize the benthic biodiversity in Cape Range and Cloates Canyons and complement ROV surveys using environmental genetics (eDNA). In a country where there are little opportunities to explore the deep sea with a dedicated science ROV, this expedition will have a major impact in understanding this deep sea region.
Biodiversity hotspots
The remote Western Australian coast (Eastern Indian Ocean) is known for its extensive karst system (sharp limestone ridges and towers in the landscape that are formed by erosion) and network of subterranean water bodies, supporting an incredible diversity of evolutionarily significant fauna. In stark contrast, the deep sea environment adjacent to this celebrated area remains almost unexplored. Major patterns of marine biodiversity appear to be strongly related to temperature, so exploring marine areas near known terrestrial hotspots offers an effective strategy for identifying undiscovered biodiversity. To counter the information deficit found in Western Australian coast, the interdisciplinary team on this expedition plans to actively survey a significant and biologically unexplored submarine canyon, Cape Range Canyon.
To get a true understanding of the area’s diversity, the science team will complement ROV SuBastian video surveys and collections with eDNA. This inventory will be helped by the use of eDNA (Environmental DNA), which refers to all the genetic material that can be recovered from an environmental sample. This cutting-edge technique can detect traces of animals left behind that may not be encountered during surveys and will serve as a comparison to more traditional techniques.
Mapping to Lead the Way
The ROV sampling will be guided by experts, as opposed to ‘blind’ grabs or trawls. This allows significant improvements in collection success, as well as re-collection on subsequent dives, and less environmental impacts. The team will also expand on the baseline seafloor mapping in the Gascoyne Marine Park to develop the regional context of canyon habitats in which to interpret the faunal inventory.
When the ROV is not in the water, R/V Falkor’s EM302 deepwater multibeam system will be used to map the seafloor. The resulting continuous high-resolution bathymetry and backscatter of the entire Cape Range Canyon (from head to abyssal fan) will help characterize habitats from which fauna are sampled.
The resulting faunal inventory is fundamental to a better understanding from which more robust ecological approaches can be developed. These areas are usually overlooked when policies are made. North-western Australian deep sea environments are broadly impacted by extraction by oil and natural gas industries. These industrial impacts are ‘out of sight, out of mind’, and an overall lack of understanding of these environments inhibits conservation actions. Understanding what biodiversity occurs in these zones is paramount to activating effective management processes.
Data & Publications
Annotated imagery is available in Squidle+. [You may have to create a username and password to access full capabilities]. To view images from this cruise, click SELECT DEPLOYMENTS, and choose FK200308.
Environmental sensor data collected by Falkor is archived at Rolling Deck to Repository.
Fluid Chemistry, CTD, Navigation and Eventlogger documentation collected by ROV Subastian is archived at Marine Geoscience Data Center.
Survey Bathymetry data is archived at AusSeaBed data portal.
Instructions on how to find the dataset:
Click on Layers in top menu. Select Map Layers > Elevation and Depth > Bathymetry – Survey > Cape Range Canyon Bathymetry 2020 64 m, then expand. Click ‘Add to Map’. Slide the Opacity bar from 0-100% to view change in coverage.
ADCP data has been processed and archived by UHDAS.
Species occurrence records from the Ningaloo Canyon have been published in the Atlas of Living Australia.
Genetic data about a new species of worm discovered during the expedition, Acrocirridae gen, n. sp. v PP-2023 is publicly available in NCBI.
Genetic data about a new species of worm discovered during the expedition, Teuthidodrilus gen, n. sp. v PPP-2023 is publicly available in NCBI.
- Post, A., Przeslawski, R., Huang, Z., Smith, D., Kirkendale, L. and N. Wilson. (2020). Gascoyne Marine Park - Post Survey Report, RV Falkor, FK200308. Report filed by Geoscience Australia.
- Post, A., Przeslawski, R., Nanson, R., Siwabessy, J., Smith, D., Kirkendale, L., and Wilson, N. G. (2022). Modern Dynamics, Morphology and Habitats of Slope-confined Canyons on the Northwest Australian Margin. Marine Geology, 443, doi: 10.1016/j.margeo.2021.106694. [This article has been published as OPEN ACCESS].
- Beaman, R., Picard, K., and Miller, A. (2022). RV Falkor Surveys in Australia 2020-2021. Oral Presentation and Conference Paper, Hydrospatial 2021 Conference, Australasian Hydrographic Society, Cairns, Australia. [Abstract and presentation are OPEN ACCESS].
- Wilson, N., Kirkendale, L., Hosie, A., Moore, G., Rouse, G., Richards, Z., et. al. (2022). An Illustrated Guide to the Fauna of the Ningaloo Canyons. Western Australian Museum. [The guide has been published as OPEN ACCESS].
- Przeslawski, R. (2022). Broad distribution of spider-shaped lebensspuren along the Australian continental margin. Frontiers in Marine Science, doi: 10.3389/fmars.2022.1086193. [This article is published as OPEN ACCESS].
- Final Expedition Report: Illuminating Biodiversity of the Ningaloo Canyons
- Przeslawski, R., Christenhusz, M. (2022). Deep-sea Discoveries. Zoological Journal of the Linnean Society, 194 (4), doi: 10.1093/zoolinnean/zlac022. [This article has been published as OPEN ACCESS.]
- Ekins, M., and Wilson, N. (2024). New carnivorous sponges (Porifera: Cladorhizidae) from Western Australia, collected by a Remotely Operated Vehicle (ROV). Scientific Reports, 14, 22173, doi: 10/1038/s41598-024-72917-8. [This article has been published OPEN ACCESS courtesy of SOI].
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