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Ecology of a polymetallic nodule occurrence gradient: Implications for deep-sea mining
Erik Simon-Lledó1,2, Brian J Bett1, Veerle A I Huvenne1
1National Oceanography Centre University of Southampton Southampton UK.
Polymetallic nodule fields significantly impact deep-sea fauna. Even small increases in nodule cover boost animal populations, highlighting the need to conserve diverse nodule habitats for effective deep-sea management.
Area of Science:
- Deep-sea ecology
- Benthic ecology
- Marine biology
Background:
- Abyssal polymetallic nodule fields are unique deep-sea habitats.
- Nodules provide hard substrata, increasing habitat complexity.
- Hard substrata influence benthic fauna composition and structure.
Purpose of the Study:
- To assess the influence of seafloor nodule cover on megabenthos.
- To understand the ecological role of nodules in the Clarion-Clipperton Zone.
- To inform conservation strategies for potential seabed mining.
Main Methods:
- Extensive photographic surveys using an autonomous underwater vehicle.
- Analysis of megabenthos in relation to varying nodule cover (1-20%).
- Statistical assessment of faunal standing stocks, diversity, composition, and species distribution.
Main Results:
- Nodule cover significantly affected faunal standing stocks, composition, and species distribution.
- Metazoan fauna and xenophyophores doubled with a 1-3% increase in nodule cover.
- Biological diversity showed little variation across the nodule cover gradient.
Conclusions:
- Seafloor nodule cover is a key factor structuring deep-sea benthic communities.
- Conservation efforts must preserve areas with a full range of nodule cover.
- Findings are critical for sustainable management plans amidst potential seabed mining.
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