{"refrec":{"BRefID":5827,"RR":"<b>Muylaert, K.</b> (1994). Fytoplanktongemeenschappen in de estuaria van de Elbe, Schelde & Gironde. MSc Thesis. Rijksuniversiteit Gent. Faculteit Wetenschappen: Gent.  Vol..1 (81 pp.); Vol. 2 (tables, plates) pp.","BEntID":5827,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":". MSc Thesis. Rijksuniversiteit Gent. Faculteit Wetenschappen: Gent.  Vol..1 (81 pp.); Vol. 2 (tables, plates) pp.","DocTypID":5,"DocType":"Book/Monograph","MarineFlag":1,"FreshFlag":0,"BrackishFlag":1,"TerrestrialFlag":0,"Authorstring":"Muylaert, K.","OrigTitleTranslFlag":1,"Authorstringtrunc":"Muylaert, K.","Englishabstract":"In spring 1993 samples were taken in and around the maximum turbidity zone of the estuaries of the Schelde, the Elbe and the Gironde. The sampling campaign took place in the framework of the MATURE-project (Biogeochemistry of the MAximum TURbidity zone in Estuaries). The phytoplankton was taxonomically analysed by means of light and/or scanning electron microscopy. Phytoplankton counts were performed using the Utermöhl method and biovolumes were calculated. These data were then analysed with the aid of two multivariate techniques (TWINSPAN, a classification technique and DCA, an ordination technique). The results of these analyses allowed the delimitation and description of phytoplankton communities. Indices for diversity (Hill-numbers N<sub>0</sub>, N<sub>1</sub>, N<sub>2</sub> en N<sub>+</sub>) were calculated for each station. Correlation of the DCA--axes with some abiotic factors (salinity, temperature, particulate suspended matter and nutrients: ammonia, nitrate, phosphate and silicate) and a canonical analysis (DCCA) were used to investigate the relationship between species composition and the abiotic factors. Total cell numbers, total phytoplankton biovolumes, chlorofyl a data and Hill numbers were correlated with the same abiotic factors (Spearman and Pearson correlation). A systematic list of all identified taxa with a description, light or electron microscopic photographs and/or pictures of most taxa is given. A preliminary checklist is presented for the three estuaries. The Schelde estuary appeared to have the highest number of species while the Gironde estuary had the smallest species number. After a comparison with previous checklists, about half of the identified species appeared to be reported for the first time in the estuaries of the Schelde and the Elbe. For the Gironde 85% of the species found were new for this estuary. Some taxa could not be identified up to species level by means of the investigated literature: a <i>Cyclotella</i> species and a centric diatom. In the oligohalinicum of the Schelde estuary we found a phytoplankton community dominated by <i>Cyclotella meneghiniana</i> and several <i>Chlorophyta</i> species. In the polyhalinicum <i>Skeletonema costatum</i> was the dominant species, accompanied by taxa associated with sediment and detritus particles (mostly <i>Thalassiosira</i> spp. and Cymatosiraceae). In the mesohalinicum <i>Coscinodiscus commutatus</i> was typical together with taxa from both previous communities. In the limnetic pan of the Elbe estuary we mainly encountered allochtonous taxa (e.g. which were flushed in from the riverine pan of the Elbe); predominantly <i>Stephanodiscus hantzschii</i> (with a parasitic <i>Chytridium</i> sp.) and Chlorophyta. In the polyhalinicum the same community occured as in the corresponding zone in the Schelde. In the euhalinicum typical marine species as <i>Ceratium fusus</i> and <i>Chaetoceros eibenii</i> were present. In the meso- and oligohalinicum taxa from the poly- and oligohaline zones occurred, but in low numbers, together with one characteristic species: <i>Cyclotella striata</i>. In the Gironde estuary we found low numbers of the taxa of the previous estuaries and also some typical taxa. These were mainly Dinoflagellates and one Chlorophyta species. In the stations in the mouth of the estuary some typical marine taxa were present in low numbers, probably flushed in from the sea. Salinity appeared to be an important factor controlling species composition; there were no species that clearly prefered intermediate salinities. Particulate suspended matter and nutrients possibly have an important influence on the size of the plankton. The higher residence time in the Schelde estuary probably resulted in a higher diversity then in the Elbe estuary, although pollution is higher in the Schelde. The total number of taxa observed was also higher in the Schelde then in the Elbe, in spite of the broader salinity range sampled in the Elbe. In the sampling stations around the zones where the strongest change in salinity takes place. salinity stress was most probably responsible for the absence of phytoplankton communities with many characteristic taxa. This factor could also explain the low cell numbers. biovolumes and diversity in these zones. The high amounts of particulate suspended matter, an important factor for the light climate, were probably responsible for the species composition in the Gironde estuary: here, taxa belonging to the Dinophyta were dominant, a group known to contain many heterotrophic taxa. The same factor might also explain the low cell numbers and biovolumes and the low diversity in this estuary.","AbstractOtherLang":"In de lente van 1993 werden in de estuaria van de Schelde, de Elbe en de Gironde stalen genomen in verschillende stations gelegen voor, na en in de maximum turbiditeitszone. Deze staalnamecampagne vond plaats in het kader van het MATURE-project (Biogeochemistry of the MAximum TURbidity zone in Estuaries). Met behulp van lichtmicroscopie en/of raster- elektronenmicroscopie werd de taxonomische samenstelling van het fytoplankton onderzocht. Fytoplanktontellingen werden uitgevoerd d.m.v. de Utermöhl-methode en biovolumes werden berekend. Deze gegevens werden verwerkt met behulp van twee multivariate technieken (TWINSPAN, een klassifikatie-techniek, en DCA, een ordinatie-analyse). Aan de hand van deze resultaten werden fytoplanktongemeenschappen afgebakend en beschreven. Diversiteitsindices (Hill-getallen N<sub>0</sub>, N<sub>1</sub>, N<sub>2</sub> en N<sub>+</sub>) werden berekend per station. De relatie tussen de soortensamenstelling en de abiotische factoren saliniteit, nutriënten (ammonium, nitraat, fosfaat en silicaat), gesuspendeerd materiaal en temperatuur werd nagegaan aan de hand van een korrelatie van de DCA-assen met deze factoren en een canonische analyse (DCCA). Het totale celaantal, het totale (fytoplankton)biovolume en de Hill-getallen werden met dezelfde factoren gekorreleerd (Spearman- en Pearsonkorrelatie). Een overzicht van de geïdentificeerde taxa is gegeven met een beschrijving en afbeeldingen (licht- of electronenmicroscopische fotos of tekeningen) van de meeste taxa. Een voorlopige 'checklist' werd opgesteld voor de drie bestudeerde estuaria. Hieruit bleek dat het Schelde-estuarium het soortenrijkst was, het Gironde-estuarium het soortenarmst. Na een vergelijking met waarnemingen uit de geraadpleegde literatuur bleek zowel voor de Schelde als voor de Elbe meer dan de helft van de taxa nog niet aangetroffen te zijn binnen deze estuaria. In het Gironde-estuarium werden 85 % van de taxa ng niet eerder aangetroffen. Enkele taxa konden niet tot op soortsniveau worden geïdentificeerd aan de hand van de bestudeerde publicaties: een <i>Cyclotella</i> sp. en een centricate diatomee sp. In het Schelde-estuarium werd in het oligohalinicum een fytoplanktongemeenschap aangetroffen die gedomineerd wordt door <i>Cyclotella meneghiniana</i> en diverse Chlorophyta. In het polyhalinicum troffen we een gemeenschap aan met <i>Skeletonema costatum</i> als typerend taxon. Tevens waren hier diverse taxa te vinden die geassocieerd voorkomen met sediment en detritus (o.a. <i>Thalassiosira</i> spp. en Cymatosiraceae). In het mesohalinicum is <i>Coscinodiscus commutatus</i> typisch en werden verder taxa aangetroffen uit de twee vorige gemeenschappen. In het Elbe-estuarium troffen we in het limnetische gedeelte van het estuarium vooral allochtone taxa aan (aangevoerd door de rivier): vooral <i>Stephanodiscus hantzschii</i> (met een parasiterende <i>Chytridium</i> sp.) en Chlorophyta. In het polyhalinicum werd een zelfde gemeenschap aangetroffen als in de overeenkomstige zone in de Schelde. In het euhalinicum vonden we vooral echt mariene soonen zoals <i>Ceratium fusus</i> en <i>Chaetoceros eibenii</i>. In het meso- en oligohalinicum kwamen taxa uit de limnetische en polyhaliene stations voor, maar in lage aantallen, en een karakteristieke soon: <i>Cyclotella striata</i>. In het Gironde-estuarium werden lage aantallen van de taxa uit de vorige estuaria aangetroffen en enkele taxa typisch voor dit estuarium. Dit waren vooral Dinoflagellaten en een taxon uit de Chlorophyta. In het station bij de monding van het estuarium werden enkele echt mariene taxa in lage aantallen aangetroffen. Wellicht waren deze taxa daar terechtgekomen door inspoeling vanuit de zee. De saliniteit blijkt een bepalende factor te zijn voor de soortensamenstelling aangezien alle taxa ofwel een hoge ofwel een lage saliniteit verkiezen; er zijn geen taxa aangetroffen die duidelijk een intermediaire saliniteit prefereren. Het gehalte aan nutriënten en gesuspendeerd mate","BibLvlCode":"M","StandardTitle":"Fytoplanktongemeenschappen in de estuaria van de Elbe, Schelde & Gironde","OrigTitleLangCode":"nl","OrigTitleLangCodeExtended":"dut","OrigTitleLangID":41,"DateLastModified":{"date":"2025-07-02 08:33:14.980000","timezone_type":1,"timezone":"+00:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":null,"MonPub":1994,"DateUpdate":"2014-09-03","DateCreate":"2001-01-25","SecASFANote":null,"ConfID":null,"PeerRev":null,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":null,"monrec":{"MonID":5827,"ISBN":null,"PubliDate":1994,"IssueDate":null,"Volume":null,"Issue":null,"Pagination":"Vol..1 (81 pp.); Vol. 2 (tables, plates)","Place":"Gent","Edition":null,"BRefXtra":null,"BRefXtraRR":null,"SerID":null,"SerRR":null,"Ser2BRefID":null,"Ser2RR":null,"StandardTitleSer":null,"ISSN":null,"AbbrevSer":null,"Degree":"MSc","ThesisID":5827,"InsID":98,"Acronym":null,"FullStandardName":"Universiteit Gent; 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