Mecho et al. 2019

scientific article | Mar Biol

Unexplored diversity of the mesophotic echinoderm fauna of the Easter Island ecoregion

Mecho A, Easton EE, Sellanes J, Gorny M, Mah C


The Easter Island ecoregion (EIE) is one of the most remote marine areas of the world and encompasses a vast and fragile ecosystem including oceanic islands and seamounts. In January 2014 and March 2016, a remotely operated vehicle was used to explore a subsurface peak off Easter Island (27.23°S, 109.48°W) and a seamount (26.92°S, 110.26°W), respectively located 10 km southwest and 98 km west of the island. More than 950 echinoderms were observed in the 5 h of video recorded during the seven dives conducted at depths between ~ 160 and 280 m. The communities of echinoderms observed at these depths markedly differed from those reported for shallower waters near Easter Island. Of the 20 morphospecies reported in the present study, only 5 were previously reported in the EIE. One species, six genera, and three families were reported for the first time in this area, and two new genera were discovered and described. A preliminary biogeographic analysis suggests affinities between the observed echinoderms and those of the West Pacific. These findings highlight the uniqueness of these assemblages and, therefore, the importance of considering them in the establishment of effective management strategies for these communities, which are within the Rapa Nui marine-protected area created in 2017.

Behind the science
Depth range
160- 280 m

Mesophotic “mentions”
15 x (total of 6824 words)

* Presents original data
* Reports new species
* Focused on 'mesophotic' depth range
* Focused on 'temperate mesophotic ecosystem'

Community structure

Other invertebrates

Easter Island

Remotely Operated Vehicle (ROV)

Author profiles