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Slak-in-Du project. Inventarisatie van de mollusken in de duingebieden langs de Belgische Kust - 2013 Oostkust
Severijns, N.; Dumoulin, E.; Bauwens, F.; De Blauwe, H. (2013). Slak-in-Du project. Inventarisatie van de mollusken in de duingebieden langs de Belgische Kust - 2013 Oostkust. Koninklijke Belgische Vereniging voor Conchyliologie Rapport, 2-2013. Koninklijke Belgische Vereniging voor Conchyliologie: Edegem. 62 pp.
Part of: Koninklijke Belgische Vereniging voor Conchyliologie Rapport. Koninklijke Belgische Vereniging voor Conchyliologie: Edegem, more
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Keywords
    Mollusca [WoRMS]; Belgium, Coastal Dunes; Fresh water; Terrestrial

Authors  Top 
  • Severijns, N., more
  • Dumoulin, E., more
  • Bauwens, F.
  • De Blauwe, H., more

Abstract
    In 2013, the second year of the “Slak-in-Du” (Snails-in-Dunes) project, the Eastern part of the Belgian coast (UTM 10 x 10 km2 squares ES18, ES28 and ES29, and mainly the UTM square ES28), has been further investigated. Apart from this also two other locations, named Schuddebeurze (at Middelkerke, in the central part of the Belgian coast, UTM square DS86) and Calmeynbos (at De Panne, West Coast, UTM square DS76) were investigated. The already quite interesting list of species observed at each of these two locations, will undoubtedly be further extended when they will be investigated in more detail in the coming years. At present a total of 81 different species of molluscs have already been observed within the project. The results obtained for the Belgian East Coast, which has been investigated quite intensively in 2012 and 2013, are very positive. A total of 80 different species of molluscs were observed, 40 of which were added in 2013. Noteworthy are the terrestrial snails Truncatellina cylindrica, Vertigo antivertigo and Vertigo pusilla, as well as the freshwater snail Aplexa hypnorum. Further, two very important species of brackish water molluscs have been observed, i.e. Auriculinella bidentata (in “Zwin Noord”) and Cerastoderma lamarcki (in the “Dievegat”). The observation of the brackish water cockle Cerastoderma lamarcki in the Dievegat, one of the very few locations where this in Belgium very threatened species still occurs, is of great importance. This certainly adds to the arguments against the planned disappearance of the Dievegat, a unique brackish water biotope and very important piece of nature. We therefore strongly suggest the Dievegat be maintained in its present state when the nature reserve “Het Zwin” will be extended in the coming years. The efficiency of the second year of the “Slak-in-Du” project was significantly higher than in 2012. This is due to the larger number of field trips and participants, the increased experience of the participants (training effect), de greater attention that was paid to slugs and freshwater molluscs, and the fact that this year soil samples were taken at all visited locations thereby assuring that the smallest species were not overlooked anymore. Even after two years of field work and study, seven species of land snails that have not been reported anymore at the Belgian East Coast since 1950, have also in this second year of the project not yet been observed. These are: Abida secale, Cecilioides acicula, Balea perversa, Monacha cartusiana, Helix itala itala, Candidula unifasciata and Arianta arbustorum. Further, Cernuella aginnica, a species that has frequently not been observed at the Belgian coast during the last about twenty years and may become endangered, has not been observed in 2013 (although in 2012 a single empty shell was found). All this requires for further detailed investigations. Finally, also the slugs, which have received already significantly more attention in 2013 in comparison to the previous year, still deserve to be searched for more actively during the field work. Nevertheless, after two years the “Slak-in-Du” project has been very successful and expectations have been entirely met already for the Belgian East Coast which has been the focus of the project till now. Indeed, in 2012 en 2013 a total of 32 species have been reported for the first time for one or more of the three UTM squares at the East Coast, nine of which are even reported for the very time for the entire East Coast. In addition, another 10 species have been reported for the first time since 1950. In 2014 and 2015 the project will concentrate mainly on the central part of the Belgian coast line.

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