Species distribution modelling of crinoids, bryozoans and ascidians in the Newfoundland and Labrador region / by J. Guijarro ... [et al.]. : Fs97-6/3181E-PDF

"Species distribution models were performed using a random forest model for Crinoids (Phylum Echinodermata: Class Crinoidea), Ascidians (Phylum Chordata: Class Ascidiacea) and Bryozoans (Phylum Bryozoa) for the spatial extent of DFO’s Placentia Bay-Grand Bank and Newfoundland and Labrador Shelves Large Ocean Management Areas (LOMA). Sixty-six environmental variables derived from various sources and native spatial resolutions were used as predictor variables in the random forest models. Species occurrence was predicted using all presence and absence data (unbalanced model), and equal numbers of presence and absence records (balanced model). The models produced from the unbalanced data were chosen as the better prediction surfaces for all three groups. The unbalanced model appeared to more accurately predict in areas of extrapolation, although none of the models were independently validated. Regression random forest models were employed to predict biomass distribution of the three taxonomic groups, but at best only explained a very small portion of the variation for the Crinoids, and were unreliable for the other groups”--Abstract.

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