{"refrec":{"BRefID":32967,"RR":"<b>Rousseau, V.; Mathot, S.; Lancelot, C.</b> (1990). Calculating carbon biomass of <i>Phaeocystis</i> sp. from microscopic observations. <i>Mar. Biol. (Berl.) 107(2)</i>: 305-314. <a href=\"https://dx.doi.org/10.1007/BF01319830\" target=\"_blank\">https://dx.doi.org/10.1007/BF01319830</a>","BEntID":32967,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Mar. Biol. (Berl.) 107(2)</i>: 305-314. <a href=\"https://dx.doi.org/10.1007/BF01319830\" target=\"_blank\">https://dx.doi.org/10.1007/BF01319830</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Rousseau, V.; Mathot, S.; Lancelot, C.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Rousseau, V. <i>et al.</i>","Englishabstract":"Conversion factors for calculating carbon biomass of <i>Phaeocystis</i> sp. colonies and free-living cells were determined from microscopic observations and chemical analysis conducted on cultured and natural <i>Phaeocystis</i> sp. populations originating from the Southern Bight of the North Sea in 1986 and 1987. They allow calculation, in terms of carbon biomass, of the different forms of <i>Phaeocystis</i> sp. that succeed each other when the population is growing, on the basis of microscopic observations. The latter include enumerations of free-living cells (flagellated and non-motile) and colonies, as well as colonial biovolume measurement. Specific application to natural populations from Dutch coastal waters during spring 1986 shows that more than 90% of <i>Phaeocystis</i> sp. carbon biomass is under colonial form, most of it exceeding the grazing characteristics of current zooplankton at this period of the year. Detailed analysis of seasonal changes shows in addition that the size of the colonies greatly increases during the course of <i>Phaeocystis</i> sp. flowering, reaching sizes as high as 1 mm diameter at the top of the bloom when nutrients are depleted. Physiologically this corresponds to an enhanced synthesis of mucilaginous substances, with the decrease of available nutrients leading to an increasing contribution of the matrix to the total colonial carbon during the course of the bloom. Carbon content of<i>Phaeocystis</i> sp. colonies therefore greatly varies with their size, ranging from 0.3 to 1430 ngC colony <sup>-1</sup>.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Calculating carbon biomass of <i>Phaeocystis</i> sp. from microscopic observations","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-19 01:31:14.121618","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":"Southern Bight; North Sea","Notes":null,"AnaPub":1990,"MonPub":null,"DateUpdate":"2018-08-14","DateCreate":"2003-03-06","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:A1990EK54700014","VABBcode":null,"OpenAcc":0,"DOI":"10.1007/BF01319830"},"refs":null,"anarec":{"AnaID":32967,"PubliDate":1990,"Pagination":"305-314","XtraPublOfAnaID":null,"ISBN":null,"Volume":"107","Issue":"2","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43352,"SerRR":"Marine Biology: International Journal on Life in Oceans and Coastal Waters. 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