The seabed habitats of the central English Channel: A generation on from Holme and Cabioch, how do their interpretations match-up to modern mapping techniques?

摘要: Abstract In the latter half of 20th century, Norman Holme and Louis Cabioch reported separate programmes work describing benthic fauna habitats ‘English’ Channel (La Manche). was based in southern England, while northern France, both developed their own interpretation ecosystem, similar geographical patterns that reflect notable environmental gradients area. Both produced a ‘map’ sorts to show distribution different communities they had identified. These interpretations were predominantly on samples collected by small dredges only later years made use (then) emerging technologies underwater cameras acoustic systems. A generation on, these have reached level maturity reliability enable them be used routinely seabed surveys. We recently completed habitat mapping survey over an extensive area central using acoustic, photographic traditional grab sampling techniques derive full-coverage modelled maps classifying biotopes according EUNIS classification scheme. curious see how for this compared our own, found entirely consistent. also we able match many faunal associations described Holme, co-workers biotope classes currently listed classification; process termed as ‘translation’. subsequently map entire Channel, allowing us expand scope comparison. Working at 3, overlaid ‘translated’ Holme's point stations scored where matched, resulting 64% overall agreement, 82% sublittoral coarse sediments, 72% sands, 27% muds 0% mixed sediments. assessment not feasible Cabioch's maps, presented poly-lines showing limits certain groups. However, simple inspection revealed reasonable degree consistency ‘whole Channel’ among his French typology map. Our new is significant improvement generated MESH REBENT projects, providing greater detail overcoming some obvious limitations previous maps. The between 21st century points potential utility legacy data ground-truth modern until such time surveys can completed. Such approach would help satisfy urgent demand reliable policy initiatives European Union's Habitats Directive Marine Strategy Framework Directive.