{"refrec":{"BRefID":137919,"RR":"<b>Jensen, A.; Sakshaug, E.</b> (1973). Studies on the phytoplankton ecology of the Trondheimsfjord. II. Chloroplast pigments in relation to abundance and physiological state of the phytoplankton. <i>J. Exp. Mar. Biol. Ecol. 11(2)</i>: 137-155","BEntID":131650,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>J. Exp. Mar. Biol. Ecol. 11(2)</i>: 137-155","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Jensen, A.; Sakshaug, E.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Jensen, A.; Sakshaug, E.","Englishabstract":"The quantitative composition of the chloroplast pigments of phytoplankton sampled weekly at 1 station in the Trondheimsfjord was studied by circular paper chromatography throughout 18 months. The concentrations of total chlorophyll a (T-chl a obtained by the trichromatic method) as well as of chromatographically purified chlorophyll a (chl a) followed the variations in phytoplankton concentration. 2 spring blooms and a weak autumn flowering of phytoplankton were clearly reflected in the pigment contents found, namely 14-16 mg T-chl a/m for the spring maxima, corresponding to nearly 300 mg T-chl a/m for the euphotic zone; and 3-4 mg/m<sup>3</sup>) or 32 mg/m<sup>3</sup> for the autumn peak. The concentrations between blooms amounted to ~ 61 mg T-chl a/m<sup>2</sup>), while concentrations down to 0.03 mg/m<sup>3</sup> were found for winter samples. The content of T-chl a was high in diatom cells prior to a bloom (20- 40 x 10<sup>-9</sup>) mg /cell). During rapid growth (a more or less exponential phase) the cell content of chloroplast pigments decreased (to 5-10 x 10<sup>-9</sup>mg). No degradation product of chlorophylls coud be detected during this phase and the percentage of chl a (of T-chl a) was high (70-80%). At the peak of the bloom, and especially when the nitrate content in the surrounding water had been exhaused, low values for T-chl a were found (0.3-0.5 x 10<sup>-9</sup> mg/cell). As soon as the cell counts started to fall, or even before the decline could be clearly detected, the percentage of chl a dropped (to 40-20%) and derived chlorophylls (not phaeophytin a) were present in the samples. Model studies with cultured algae showed a similar behaviour. It is concluded that the proportion of chl a to T-chl a and the occurrence of chlorophyll derivatives in phytoplankton samples can give valuable information on the stage of development of the algal populations involved.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Studies on the phytoplankton ecology of the Trondheimsfjord. II. Chloroplast pigments in relation to abundance and physiological state of the phytoplankton","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":1973,"MonPub":null,"DateUpdate":"2009-06-18","DateCreate":"2009-06-18","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":{"AnaID":137919,"PubliDate":1973,"Pagination":"137-155","XtraPublOfAnaID":null,"ISBN":null,"Volume":"11","Issue":"2","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43229,"SerRR":"Journal of Experimental Marine Biology and Ecology. Elsevier: New York.  ISSN 0022-0981; e-ISSN 1879-1697","StandardTitleSer":"Journal of Experimental Marine Biology and Ecology","ISSN":"0022-0981","AbbrevSer":"J. 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Ecol.","StandardTitleMon":null,"StartPage":137,"Pages":19,"ToPubliDate":null,"BRefBibLvlCode":"S","SerNotes":null},"monrec":null,"serrec":null,"relations":null,"relationsRev":null,"addrec":{"Line1":"Trondheim","Email":null,"Line2":null,"EnvName":"Norway"},"othpubs":null,"ownerships":null,"authors":[{"AutName":"Jensen","Firstname":"Arne","Initials":"A.","Affiliation":null,"Discriminator":null,"CorporateFlag":0,"BEntID":131650,"AutID":45179,"OrderNr":1,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":null,"ORCID":null,"PersID":null,"InsID":null},{"AutName":"Sakshaug","Firstname":"Egil","Initials":"E.","Affiliation":null,"Discriminator":null,"CorporateFlag":0,"BEntID":131650,"AutID":54887,"OrderNr":2,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":null,"ORCID":null,"PersID":null,"InsID":null}],"mapdetails":null,"datasets":null,"monographs":null,"monparts":null,"serparts":null,"BEntOpen":null,"BEntPrivate":null,"availability":null,"litstyles":null,"thespers":null,"arch2discl":null,"SERpubls":[{"PublName":"Elsevier","City":"New York"}],"MONpubls":null,"pictures":[],"thestermsPath":null,"thestermsASFA":null,"taxtermsASFA":null,"geotermsASFA":null,"collections":null,"conf":null,"proj":null,"Physdatasets":null,"spcols":null,"doi":null,"publs":null,"serparttypes":null,"monauthors":null,"MParts":null,"SParts":null,"hLibs":null,"langs":[{"BEntID":131650,"AbstractFlag":-1,"LangID":15,"LangCode":"en","Lang":"English","DutchTerm":"Engels","LangCodeExtended":"eng"}],"urls":null,"thesterms":null,"taxterms":null,"geoterms":null,"othterms":null,"asfacodes":null,"asfa2codes":null,"thestermsFRIS":null,"taxtermsFRIS":null,"geotermsFRIS":null,"othtermsFRIS":null,"resmessage":"","complete":1,"sessions":{"newSesName":"Milh, Dominique, D.","newSesDate":{"date":"2009-06-18 08:32:05.010000","timezone_type":3,"timezone":"Europe/Brussels"},"updSesName":"Milh, Dominique, D.","updSesDate":{"date":"2009-06-18 08:32:05.010000","timezone_type":3,"timezone":"Europe/Brussels"}}}