Kaikōura's deep seabed is rapidly recovering, say experts frontiersin
). Counting the number of individuals or individual colonies was straightforward for most taxa, except for burrowing ophiuroids and the foraminiferan. Burrowing ophiuroids were only partially observable, and so counts for this taxon were determined by dividing the number of arms observed above the seafloor by two, the number of arms typically observed above the sediment in aquaria studies .
The contiguous images along the transect were assigned to ‘sample groups’ with a maximum of ten images and a minimum of four images per group. Sample group membership was determined using a multivariate measure of pseudo standard error known as “MultiSE” applied to the Kaikōura Canyon megafauna data. MultiSE evaluates the amount of variation in the position of group centroids in the space of the chosen dissimilarity measure under repeated sampling.
Environmental variables derived from the bathymetry layers were extracted for each image based on the latitude and longitude of each image, and the average of these values was taken for each sample group. Water depth measurements derived from the CTD were assigned to each image or sample group based on timestamps associated with each image/sample group and the CTD measurements.
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