{"refrec":{"BRefID":27739,"RR":"<b>ten Hallers-Tjabbes, C.C.; Everaarts, J.M.; Mensink, B.P.; Boon, J.P.</b> (1996). The decline of the North Sea whelk (<i>Buccinum undatum</i> L.) between 1970 and 1990: a natural or a human-induced event?, <b><i>in</i></b>: Dworschak, P.C. <i>et al.</i> <i>Influences of organisms on their Environment, the role of episodic events: Proceedings of the 29th European Marine Biology Symposium Vienna, 29 August-2 September 1994. Marine Ecology (Berlin),</i> 17(1-3): pp. 333-343","BEntID":27739,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":", <b><i>in</i></b>: Dworschak, P.C. <i>et al.</i> <i>Influences of organisms on their environment, the role of episodic events: Proceedings of the 29th European Marine Biology Symposium Vienna, 29 August-2 September 1994. European Marine Biology Symposia,</i> 29: pp. 333-343","DocTypID":17,"DocType":"Book chapters","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"ten Hallers-Tjabbes, C.C.; Everaarts, J.M.; Mensink, B.P.; Boon, J.P.","OrigTitleTranslFlag":0,"Authorstringtrunc":"ten Hallers-Tjabbes, C.C. <i>et al.</i>","Englishabstract":"Recent surveys in the southern and central North Sea and the Dutch Wadden Sea revealed that the whelk <i>Buccinum undatum</i> L. can no longer be found in areas where whelks were abundant twenty or more years ago. The decline of whelk populations tends to coincide with areas of various, intense human activities, which may cause either pollution or physical damage. 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