Application of General Linear Models (GLM) to Assess Nodule Abundance Based on a Photographic Survey (Case Study from IOM Area, Pacific Ocean)

The success of the future exploitation Pacific polymetallic nodule deposits depends on an accurate estimation their resources, especially in small batches, scheduled for extraction short term. based only results direct seafloor sampling using box corers is burdened with a large error due to long interval and high variability abundance. Therefore, estimations should take into account bottom photograph analyses performed systematically numbers along course research vessel. For photographs taken at sites, relationship linking abundance independent variables (the percentage coverage, genetic types nodules context fraction distribution, degree sediment coverage nodules) was determined general linear model (GLM). Compared estimates obtained simple this parameter significant decrease standard prediction error, from 4.2 2.5 kg/m2, found. use GLM assessment individual sites covered by photographs, outside contribute increase accuracy resources.