PANGAEA_903580 Observation of a high abundance aggregation of the deep-sea urchin Chaetodiadema pallidum A. Agassiz and H.L. Clark, 1907 on the Northwestern Hawaiian Island Mokumanamana Morgan, Nicole B; Baco, Amy R Observation of a high abundance aggregation of the deep-sea urchin Chaetodiadema pallidum A. Agassiz and H.L. Clark, 1907 on the Northwestern Hawaiian Island Mokumanamana 2019-07-05 PANGAEA Dataset Supplement to: Morgan, Nicole B; Baco, Amy R (2019): Observation of a high abundance aggregation of the deep-sea urchin Chaetodiadema pallidum A. Agassiz and H.L. Clark, 1907 on the Northwestern Hawaiian Island Mokumanamana. Deep Sea Research Part I: Oceanographic Research Papers, https://doi.org/10.1016/j.dsr.2019.06.013 https://doi.pangaea.de/10.1594/PANGAEA.903580 Investigator Nicole B Morgan nmorgan@fsu.edu Earth Science DATE/TIME Transect File name Uniform resource locator/link to image LATITUDE LONGITUDE DEPTH, water Height above sea floor/altitude Oxygen Temperature, water Conductivity Species Number of individuals Chaetodiadema pallidum geoscientificInformation AUV Imagery Mokumanamana Multiple investigations Seamount Species Range Urchin Aggregation 2015-11-03 2015-11-03 Complete 23.5504274 23.5735142 -164.8734871 -164.8638271 177.348 m (DEPTH, water) 285.723 m (DEPTH, water) unrestricted CC-BY-4.0: Creative Commons Attribution 4.0 International English PANGAEA Data Publisher for Earth & Environmental Science https://www.pangaea.de/ Data Center Contact Michael Diepenbroek info@pangaea.de

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Bremen Bremen 28359 Germany online 14930 data points text/tab-separated-values

AUV images of deep-sea megafauna on the seamount Mokumanamana in the Northwestern Hawaiian Islands revealed a large aggregation of the diadematoid urchin Chaetodiadema pallidum. This species had not been previously recorded on this seamount, but was known from other locations in the Hawaiian Archipelago. A total of 11,360 individuals were counted by eye from 1,369 seafloor images along the 200, 250, and 300 m depth contours on the west side of Mokumanamana. To estimate the full population size, Inverse Distance Weighting and Empirical Bayesian Kriging interpolation calculated a total population size of between 139,552 and 144,063 individuals. These estimates are 1-2 orders of magnitude greater than any previous estimates of urchin aggregation abundances. Little biological data exists for this species; thus, it is difficult to know if this is a spawning aggregation, a feeding front, a type of "schooling" behavior, or some combination thereof, but a food source did seem to be present in the form of mesophotic green algal detritus. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.903580"!

http://en.wikipedia.org/wiki/ISO_6709 LATITUDE http://en.wikipedia.org/wiki/ISO_6709 LONGITUDE http://en.wikipedia.org/wiki/ISO_8601 DATE/TIME https://doi.org/10.1016/j.dsr.2019.06.013 Observation of a high abundance aggregation of the deep-sea urchin Chaetodiadema pallidum A. Agassiz and H.L. Clark, 1907 on the Northwestern Hawaiian Island Mokumanamana https://en.wikipedia.org/wiki/Electrical_conductivity Conductivity https://en.wikipedia.org/wiki/Species Species DIF 9.4 2019-07-05 2026-07-15