{"refrec":{"BRefID":13022,"RR":"<b>Daan, R.; Kuipers, B.R.; Witte, H.J.; Gonzalez, S.; Witte, H.; van den Ende, F.</b> (1985). Zooplankton-ontwikkelingen in het kustgebied van de Zuidelijke Noordzee: Resultaten van het veldwerk-project Meetpost Noordwijk 1984. <i>Interne verslagen Nederlands Instituut voor Onderzoek der Zee</i>, 1985(2). NIOZ: Texel. 28 pp.","BEntID":13022,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":". <i>Interne verslagen Nederlands Instituut voor Onderzoek der Zee</i>, 1985(2). NIOZ: Texel.  28 pp.","DocTypID":13,"DocType":"Reports","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Daan, R.; Kuipers, B.R.; Witte, H.J.; Gonzalez, S.; Witte, H.; van den Ende, F.","OrigTitleTranslFlag":1,"Authorstringtrunc":"Daan, R. <i>et al.</i>","Englishabstract":null,"AbstractOtherLang":"Een sterke afname in copepodedichtheden, die terug te voeren valt op afname in dichtheden van jongere stadia, zoals in 1984 het geval was bij <i>Temora</i>, leidt tot 2 mogelijke veronderstellingen: Eerste veronderstelling: Er is een stagnatie in de productie van nieuwe generaties, doordat er geen eieren meer zijn, of doordat deze niet uitkomen. Voor deze veronderstelling zijn de volgende theoretische verklaringen mogelijk: 1. Er is een stagnatie in de eiproductie van volwassen <i>Temora</i> als gevolg van voedselgebrek, eventueel mede veroorzaakt door stijging van de watertemperatuur 2. Er is een verhoogde predatiedruk op copepodeeieren, speciaal op die van <i>Temora</i> 3. Infectie van <i>Temora</i>-eieren (bijv. door een schimmel) , waardoor deze verminderde overlevingskansen hebben. Een dergelijk verschijnsel zou kunnen samenhangen met temperatuur 4. Kannibalisme: Als gevolg van voedselgebrek zouden volwassen dieren over kunnen schakelen op eieren als voedselbron 5. Door daling van de viscositeit van het zeewater zouden <i>Temora</i>-eieren eventueel versneld kunnen uitzakken naar de boden; <i>Temora</i>-eieren bevatten, i.t.t. die van bijvoorbeeld <i>Centropages</i>, geen zweefvermogen-vergrotende aanhangsels. Tweede veronderstelling: Er is een verhoogde mortaliteit onder de nauplii. Voor deze veronderstelling zijn de volgende theoretische verklaringen mogelijk: 1. Voedselgebrek, eventueel mede veroorzaakt door temperatuurstijging, zou kunnen leiden tot sterfte bij de nauplii: In 1984 bleek echter ten tijde van de ineenstorting van <i>Temora</i>nauplii de concentratie van kleine algen op peil te blijven 2. Verhoogde predatie op nauplii, specifiek die van <i>Temora</i>. De in 1984 onderzochte predatoren (<i>Phialidium</i> en <i>Noctiluca</i>) bleken echter nauwelijks te prederen op nauplii. 3. Kannibalisme: Als gevolg van voedselgebrek zouden volwassen copepoden kunnen overschakelen op nauplii, selectief op die van <i>Temora</i>, als voedselbron. In 1985 zal op de Meetpost Noordwijk een hernieUwd onderzoeksprogramma worden uitgevoerd, waarin de nadruk zal liggen op beantwoording van de vraag in hoeverre ieder van bovengenoemde verklaringen reële betekenis heeft.","BibLvlCode":"MS","StandardTitle":"Zooplankton-ontwikkelingen in het kustgebied van de Zuidelijke Noordzee: Resultaten van het veldwerk-project Meetpost Noordwijk 1984","OrigTitleLangCode":"nl","OrigTitleLangCodeExtended":"dut","OrigTitleLangID":41,"DateLastModified":{"date":"2025-07-25 01:33:49.256478","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":null,"MonPub":1985,"DateUpdate":"2025-07-18","DateCreate":"2001-07-09","SecASFANote":null,"ConfID":null,"PeerRev":0,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":null,"monrec":{"MonID":13022,"ISBN":null,"PubliDate":1985,"IssueDate":null,"Volume":"1985","Issue":"2","Pagination":"28","Place":"Texel","Edition":null,"BRefXtra":null,"BRefXtraRR":null,"SerID":5036,"SerRR":"Interne verslagen Nederlands Instituut voor Onderzoek der Zee. 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