Abyssal near-bottom dispersal stages of benthic invertebrates in the Clarion-Clipperton polymetallic nodule province. (September 2017)

• Record Type: Journal Article
• Authors: Kersten, Oliver; Smith, Craig R.; Vetter, Eric W.
• Is Part Of: Deep sea research. Volume 127(2017)
• Page Start: 31
• Page End: 40
• Publication Date: 2017-09
• Subjects: Abyssal meroplankton -- Clarion-Clipperton Zone -- Polymetallic nodule mining -- Benthic invertebrate larvae -- Benthic Boundary Layer; Oceanography -- Periodicals; Océanographie -- Périodiques; 551.4605
• DOI: 10.1016/j.dsr.2017.07.001
• Languages: English
• ISSNs: 0967-0637

Abstract

Abstract: Growing interest in polymetallic nodule mining has intensified the need to characterize the abundance, community structure and vertical flux of meroplankton in the Clarion-Clipperton Zone (CCZ) to facilitate the estimation of larval supply and potential connectivity of benthic populations. These ecological parameters are essential to predict recolonization processes following the expected large-scale, high intensity disturbances associated with nodule extraction. Here, we present the first description of the composition, abundance, temporal variability, and mesoscale distribution of dispersing stages of the benthos in two study areas in the eastern CCZ. Samples from free-vehicle plankton pumps showed little variation in meroplankton diversity and abundance over scales of 30–100 km for time scales of days to weeks. However, sediment-trap samples revealed high temporal variability in vertical flux over weeks to months. Larval abundances and fluxes measured in the abyssal CCZ are ~ 1–2 orders of magnitude lower than observed at deep-sea ridge and hydrothermal-vent habitats. We found significantly higher downward larval fluxes at 11 m above the bottom (mab) than at 146 mab, indicating accumulation or retention of meroplankton within the Benthic Boundary Layer (BBL). The high abundance of meroplankton in the BBL emphasizes its importance to dispersing stages and suggests that the creation of large sediment plumes in the BBL during nodule mining could compromise the dispersal and recruitment abilities of the abyssal benthos, potentially slowing rates and altering patterns of benthic community recovery following mining disturbance. Highlights: Abyssal near-bottom meroplankton was studied in the eastern Clarion-Clipperton Zone. Larval abundances and fluxes were drastically lower than in other deep-sea ecosystems. Downward larval flux was higher within the Benthic Boundary Layer than above it. The larval assemblage remains highly under-sampled and requires further study. Mining sediment plumes may harm larval supply and benthic population connectivity.