First records of the sponge crab Dromia personata (Brachyura) in the Netherlands and its historical findings in the North Sea

Abstract

Only a few records exist of the sponge crab Dromia personata in the North Sea. Most records are in local languages, and have limited availability. On 11 August 2016, D. personata was found by divers in the Eastern Scheldt, a former estuary in the south-western part of the Netherlands. In the months to follow, at least four other individuals were observed by divers at the same and nearby locations. This paper lists these and former records in the North Sea. The distribution pattern, and the possible migration of the sponge crab in relation to environmental conditions such as seawater temperature are discussed, as well as the crab's use of the non-native sponge Celtodoryx ciocalyptoides.

Engaging recreational scuba divers in marine citizen science: Differences according to popularity of the diving area

“…Augustine et al, 2016;Musa, 2002), whereas in temperate waters it is mainly national divers who are active . For example, in a study of a rare subtidal crab from the cold-temperate and turbid North Sea (north-west Europe), the participating recreational divers were all local divers (van Moorsel et al, 2017). Rousseau and Fuertes (2020), who investigated divers in a cold-water estuary with limited visibility, also emphasized that divers were mostly local and experienced.…”