{"refrec":{"BRefID":12939,"RR":"<b>Bergman, M.J.N.; Spliethoff, P.J.; van der Veer, H.W.</b> (1980). De ecologie van de 0-groep schol (<i>Pleuronectus platessa</i> L.) op het Balgzand: 1. Aantalsverloop, verspreiding en getijdenmigratie. <i>Interne verslagen Nederlands Instituut voor Onderzoek der Zee</i>, 1980(9). NIOZ: Texel. 40 pp.","BEntID":12939,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":". <i>Interne verslagen Nederlands Instituut voor Onderzoek der Zee</i>, 1980(9). NIOZ: Texel.  40 pp.","DocTypID":13,"DocType":"Reports","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Bergman, M.J.N.; Spliethoff, P.J.; van der Veer, H.W.","OrigTitleTranslFlag":1,"Authorstringtrunc":"Bergman, M.J.N.; Spliethoff, P.J.; van der Veer, H.W.","Englishabstract":"This paper describes the results of a field investigation of the density, dispersion and tidal migration of 0-group plaice (<i>Pleuronectes platessa</i>) on the Balgzand, a tidal area in the western Waddenzee. Settlement of the plaice, which enter the area by the tidal inlets in spring, occurs on the tidal flats. During their first month following settlement the animals do not migrate from the area of settlement. After settlement has been completed there follows a marked reduction in the density of the animals. About this time, the first-settled specimens commence a tidal migration involving a movement during ebb tide periods to the small channels which connect the tidal flats with the Amsteldiep. Possibly, the decrease in numbers is associated with predation occurring at low tide in these small channels. Each individual plaice spends a particular length of timein the intertidal area before beginning to migrate. Once each specimen has developed migratory behaviour, the population as a whole migrates onto the flats and back into the surrounding channels. Neither the dispersion pattern, nor its tidal rhythmicity varies for the rest of the season.","AbstractOtherLang":"Dit onderzoek geeft de resultaten van een veldonderzoek naar het aantalsverloop, de verspreiding en de getijdenmigratie van 0-groep schollen op het Balgzand, een getijdengebied in de westelijke Waddenzee. Settlement van de schollen, die in het voorjaar door de zeegaten binnentrekken, vindt plaats op de met LW net niet droogvallende platen. De eerste maand vertonen deze schollen geen getijdenmigratie; zowel met HW als met LW bevinden zij zich op de net niet droogvallende platen. Aan het einde van het settlement blijkt er een sterke aantalsafname op te treden. Deze valt samen met het op gang komen van de getijdenmigratie met LW naar de prielen, zodat verondersteld wordt, dat deze aantalsafname het gevolg is van predatie met LW in de prielen. De getijdenmigratie komt pas op gang nadat een schol een bepaalde tijdsduur in het getijdengebied heeft doorgebracht. Nadat alle individuen dit migratie- gedrag ontwikkeld hebben, migreert de populatie als één geheel de platen op en af. Noch het verspreidingspatroon van de schollen met HW, noch het getijritme blijkt zich verder in de loop van het seizoen nog te wijzigen.","BibLvlCode":"MS","StandardTitle":"De ecologie van de 0-groep schol (<i>Pleuronectus platessa</i> L.) op het Balgzand: 1. 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