{"refrec":{"BRefID":103629,"RR":"<b>Bouma, S.; Holland, A.; Vethaak, D.</b> (1999). Visdieven in problemen: De resultaten van veld- en experimenteel onderzoek van de kolonie visdieven (<i>Sterna hirundo</i>) bij Terneuzen, 1994-1999. <i>Rapport RIKZ = Report RIKZ</i>, 99.037. RIKZ: Middelburg. 39 pp.","BEntID":97898,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":". <i>Rapport RIKZ = Report RIKZ</i>, 99.037. RIKZ: Middelburg.  39 pp.","DocTypID":13,"DocType":"Reports","MarineFlag":1,"FreshFlag":0,"BrackishFlag":1,"TerrestrialFlag":0,"Authorstring":"Bouma, S.; Holland, A.; Vethaak, D.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Bouma, S.; Holland, A.; Vethaak, D.","Englishabstract":null,"AbstractOtherLang":"Dit rapport geeft een overzicht van verschillende onderzoeken die uitgevoerd zijn in de periode van 1994 tot en met 1999 naar de oorzaak voor het slechte broedsucces van visdieven (<i> Sterna hirundo </i>) in de kolonie op het sluizencomplex bij Terneuzen. Van 1979 tot 1994 vertoonde het aantal broedparen in deze kolonie een toenemende trend en het broedsucces was goed. In de daarop volgende jaren werd echter een aantal zorgwekkende ziekteverschijnselen waargenomen en was het broedsucces herhaaldelijk nihil tot slecht. Deze verschijnselen werden niet waargenomen in de overige kolonies in het Westerscheldegebied. 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