{"refrec":{"BRefID":12829,"RR":"<b>Goedheer, P.F.</b> (1977). Biomassa en produktie van macro-algen. <i>Interne verslagen Nederlands Instituut voor Onderzoek der Zee</i>, 1977(11). NIOZ: Texel. 52 pp.","BEntID":12829,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":". <i>Interne verslagen Nederlands Instituut voor Onderzoek der Zee</i>, 1977(11). NIOZ: Texel.  52 pp.","DocTypID":13,"DocType":"Reports","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Goedheer, P.F.","OrigTitleTranslFlag":1,"Authorstringtrunc":"Goedheer, P.F.","Englishabstract":"Although data for primary production of phytoplankton and microphytobenthos in the Dutch Wadden Sea are available, macro- phytobenthos data are still lacking. Therefore field-observations of biomass and primary production were started in 1976 on different tidal stations near Texel. Biomass was estimated by sampling at regular intervals near fixed stations and by a \"line-transect\" method. Average biomass value for 37 stations in the Mokbaai during the top of the growing season was 11.2 g dry weight/m². Maximum observed values were 2.5 g, 23.3 g and 55.0 g dry weight/m² for respectively tube-dwelling diatoms, <i>Enteromorpha</i> and <i>Ulva</i>. Primary production was measured with the 14C method, it varied from 8.4-75.7 mgC/g dry weight/day. Biomass/m² and primary production/dry weight.day were used to calculate primary production/m² for the different days. Annual primary production of macroalgae amounts to 5-26 gC/m².year i.e. considerable lower than values observed both for phytoplankton and microphytobenthos in the Dutch Wadden Sea (about 100 gC/m².year). Transport of macroalgae from where they start growing plays an important role in the Wadden Sea. Some idea of its importance could be gained from the estimation of a \"potential biomass\" of macroalgae, using biomass at the beginning of the growing season and the measured primary production/dry weight during the season. This \"potential biomass\" was 1-100 times higher than the observed biomass. This indicates the importance of factors decreasing biomass of which transport will be the most important.","AbstractOtherLang":"In aansluiting op metingen van primaire produktie van fytoplankton en microfytobenthos werd gedurende 1976 produktie van macro-fytobenthos gemeten op aantal stations op het wad nabij het eiland Texel (Mokbaai en NIOZ-wad) .Er werden waarden gevonden van 8.4-75.7 mgC/g drooggewicht/dag. Twee methoden (monsteren en line transects) werden toegepast voor schattingen van de biomassa, die plaatselijk hoog kan zijn. De maximum waarden bedroegen 2.5, 23.3 en 35.0 asvrij drooggewicht/m² voor respectievelijk buisdiatomeeën, <i>Enteromorpha</i> en <i>Ulva</i> groep. Gedurende de top, in augustus, was de gemiddelde waarde over 37 stations in het noordwestelijk deel van de Mokbaai 11.2 g drooggewicht/m². Deze hoge waarden in de zomer resulteren in een korte periode van hoge produktie per vierkante meter, die theoretisch kan stijgen tot 420 mgC/m², maar in de praktijk lager zal zijn, als gevolg van onderling overschaduwen. De totale geschatte jaarproduktie bleek plaatselijk sterk te wisselen en varieerde van 5 tot 26 g C/m²/jaar. d.w.z. duidelijk lager dan die van fytoplankton en microfytobenthos in de Wadden zee . Tenslotte werd de gemeten biomassa vergeleken met waarden, die waren berekend uit de produktie-gegevens. De gemeten maximale biomassa bleek een factor 1 à 100 lager te zijn dan de berekende biomassa, zodat er een afvoer van zwevend algenmateriaal uit de Mokbaai naar elders moet zijn.","BibLvlCode":"MS","StandardTitle":"Biomassa en produktie van macro-algen","OrigTitleLangCode":"nl","OrigTitleLangCodeExtended":"dut","OrigTitleLangID":41,"DateLastModified":{"date":"2025-07-22 01:33:06.175990","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":null,"MonPub":1977,"DateUpdate":"2025-07-15","DateCreate":"2001-07-04","SecASFANote":null,"ConfID":null,"PeerRev":0,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":null,"monrec":{"MonID":12829,"ISBN":null,"PubliDate":1977,"IssueDate":null,"Volume":"1977","Issue":"11","Pagination":"52","Place":"Texel","Edition":null,"BRefXtra":null,"BRefXtraRR":null,"SerID":5036,"SerRR":"Interne verslagen Nederlands Instituut voor Onderzoek der Zee. 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