Keywords: Abludomelita obtusata; Abludomelita obtusata, standard deviation; Actiniaria; Actiniaria, standard deviation; Aonides paucibranchiata; Aonides paucibranchiata, standard deviation; Atylus swammerdamei; Atylus swammerdamei, standard deviation; Bathyporeia elegans; Bathyporeia elegans, standard deviation; Bathyporeia guilliamsoniana; Bathyporeia guilliamsoniana, standard deviation; Chaetozone cf. setosa; Chaetozone cf. setosa, standard deviation; Counting; DEPTH, sediment/rock; Distance; Echinocardium cordatum; Echinocardium cordatum, standard deviation; Eunereis longissima; Eunereis longissima, standard deviation; FINO1; Lanice conchilega; Lanice conchilega, standard deviation; Magelona filiformis; Magelona filiformis, standard deviation; Magelona johnstoni; Magelona johnstoni, standard deviation; Maximum; Minimum; Monitoring station; MONS; Montacuta ferruginosa; Montacuta ferruginosa, standard deviation; Nemertea; Nemertini, standard deviation; Nephtys cirrosa; Nephtys cirrosa, standard deviation; North Sea; Notomastus latericeus; Notomastus latericeus, standard deviation; Owenia fusiformis; Owenia fusiformis, standard deviation; Phoronis spp.; Phoronis spp., standard deviation; Poecilochaetus serpens; Poecilochaetus serpens, standard deviation; Portunidae; Portunidae, standard deviation; Presence; Scoloplos armiger; Scoloplos armiger, standard deviation; Spiophanes bombyx; Spiophanes bombyx, standard deviation; Spio spp.; Spio spp., standard deviation; Tellina fabula; Tellina fabula, standard deviation; Thracia papyracea; Thracia papyracea, standard deviation; Urothoe poseidonis; Urothoe poseidonis, standard deviation