{"refrec":{"BRefID":12924,"RR":"<b>Dewicke, A.</b> (1991). Seizoenale en ruimtelijke patronen in de hyperbenthische gemeenschap van de Westerschelde. MSc Thesis. University of Gent, Zoology Institute, Marine Biology Section: Gent. 119 pp.","BEntID":12924,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":". MSc Thesis. University of Gent, Zoology Institute, Marine Biology Section: Gent.  119 pp.","DocTypID":5,"DocType":"Book/Monograph","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Dewicke, A.","OrigTitleTranslFlag":1,"Authorstringtrunc":"Dewicke, A.","Englishabstract":"The Westerscheldt is an estuary characterised by an important salinity-gradient. The hyperbenthic fauna (organisms living in the water-column, near the bottom), was sampled along this gradient. Fourteen localities were investigated over three seasons (April, August and December). The hyperbenthic fauna consists of the temporary and the permanent hyperbenthos. Mysids are the most important representatives of the permanent hyperbenthos, this is exemplified by their density as well as their biomass. Other important groups are the Isopodes and the Amphipodes. The highest density and biomass is reached in summer. In December the hyperbenthos is still present. It is, however, far less abundant than in August. Compared to other months, the ratio biomass/density is strikingly bigger in April. The temporary hyperbenthos consists mainly of crab-larvae, fish-eggs and-larvae. It is mainly present during spring. The distribution of organisms along the estuary is largely dependent on their salinity-preference and -tolerance. For more planktonic creatures the water currents and the tidal activity also prove to be important. Along the estuary , one can clearly discriminate species-communities. To the East there is an estuarine community. Downstream, the typically estuarine species are gradually being replaced by marine animals, resulting in a typical marine community at the mouth of the river . The species-communities at the mouth are the most diverse, they are characterised by low densities and biomasses. The estuarine fauna, however, is less diverse, the present species have high densities and biomasses. The species-communities not only show a spatial sequence, there is also a temporal succession. There are always one or two dominant mysid species who replace one another in space and time. The CCA-analysis reveal that there is a strong correlation between the species- communities and the salinity/extinction gradient. Besides their own biology, characterizing the species in the community, a lot of species show a salinity preference. This variable is determining for the occurrence of a lot of biota in the estuarine ecosystem. Finally, the population structure of several mysids was studied. In April, a population of mainly large, overwintering adults was found. In August all life stadia were present in reasonable numbers. The adults become mature earlier and are therefore less big. In December the population largely consists of juveniles and subadults who mature slowly and will live through winter. The large body-sizes found in the April-population are an explanation for the large biomass/density ratio found in that month.","AbstractOtherLang":"De Westerschelde is een estuarium dat gekenmerkt wordt door een belangrijke saliniteitsgradiënt. De hyperbenthische fauna (die organismen die in de waterkolom leven, net boven de bodem), werd langsheen deze gradiënt bemonsterd. Er werden 14 lokaties onderzocht in 3 seizoenen (april, augustus en december). De hyperbenthische fauna kan opgesplitst worden in het tijdelijke en het permanente hyperbenthos. Aasgarnalen zijn de belangrijkste vertegenwoordigers van het permanente hyperbenthos, zowel qua densiteit als biomassa. Andere belangrijke groepen zijn isopoden en amphipoden. De hoogste densiteiten en biomassa's worden bereikt in de zomer. In de maand december is het hyperbenthos nog aanwezig, maar in veel mindere mate. De biomassa/densiteit verhouding is opvallend groter in april in vergelijking met de andere maanden. Het tijdelijk hyperbenthos bestaat hoofdzakelijk uit krabbelarven, viseieren en vislarven, die vooral in de lente aanwezig zijn. De distributie van de organismen langs het estuarium is vooral afhankelijk van saliniteitspreferentie en -tolerantie. Voor meer planktonische organismen speelt de stroming en getijdenwerking ook een grote rol. In het estuarium zijn duidelijk soortengemeenschappen te onderscheiden. In het oostelijk deel is er een \"estuariene\" gemeenschap aanwezig. Naarmate men stroomafwaarts gaat, worden geleidelijk aan de typisch estuariene soorten vervangen door meer mariene soorten, die uiteindelijk een typisch mariene gemeenschap vormen voor de monding. De soortengemeenschappen aan de monding zijn het meest divers en zijn gekenmerkt door lage densiteiten en biomassa's. De estuariene fauna daarentegen is zeer weinig divers, densiteiten en biomassa's van de aanwezige soorten zijn zeer hoog. De soortengemeenschappen tonen niet alleen een ruimtelijk verloop, ook temporeel volgen verschillende gemeenschappen elkaar op. Telkens domineren één of twee aasgarnalensoorten die elkaar ruimtelijk en temporeel vervangen. Uit de CCA-analyses blijkt dat er een sterke korrelatie is tussen de soortengemeenschappen en de saliniteit/extinctie gradiënt. Naast de eigen biologie die de soorten binnen een gemeenschap karakteriseert, hebben veel soorten inderdaad een preferentie voor saliniteit, een variabele die bepalend is voor het voorkomen van veel biota's in het estuariene ecosysteem . Tenslotte werd de populatiestruktuur van een aantal aasgarnalen bestudeerd. In april werd de overwinterde generatie aangetroffen die bestaat uit grote adulten. In de augustuspopulatie zijn alle levensstadia talrijk vertegenwoordigd, de adulten zijn vlugger matuur en worden minder groot. In december bestaat de populatie hoofdzakelijk uit juvenielen en subadulten die langzaam matuur worden en gaan overwinteren. De grote afmetingen van de aprilpopulatie zijn de verklaring voor het feit dat de biomassa/densiteit verhouding in deze maand zeer groot is.","BibLvlCode":"M","StandardTitle":"Seizoenale en ruimtelijke patronen in de hyperbenthische gemeenschap van de Westerschelde","OrigTitleLangCode":"nl","OrigTitleLangCodeExtended":"dut","OrigTitleLangID":41,"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":null,"MonPub":1991,"DateUpdate":"2020-04-27","DateCreate":"2001-07-05","SecASFANote":null,"ConfID":null,"PeerRev":0,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":null,"monrec":{"MonID":12924,"ISBN":null,"PubliDate":1991,"IssueDate":null,"Volume":null,"Issue":null,"Pagination":"119","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":12924,"InsID":471,"Acronym":"UGent","FullStandardName":"Universiteit Gent","ToPubliDate":null,"SerNotes":null,"eISBN":null,"Pages":119},"serrec":null,"relations":null,"relationsRev":null,"addrec":null,"othpubs":null,"ownerships":null,"authors":[{"AutName":"Dewicke","Firstname":"Ann","Initials":"A.","Affiliation":null,"Discriminator":null,"CorporateFlag":0,"BEntID":12924,"AutID":4671,"OrderNr":1,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":null,"ORCID":null,"PersID":224,"InsID":null}],"mapdetails":null,"datasets":[{"DasID":466,"Acronym":null,"Citation":"Beyst, B.; Fockedey, N.; Hostens, K.; Mees, J.; Marine Biology Research Group - Ugent: Belgium; (2004): Ecological hyperbenthic data of the Scheldt estuary: historical data (1988-2001). Marine Data Archive.","StandardTitle":"Ecological hyperbenthic data of the Scheldt estuary: historical data (1988-2001)","RelationID":1,"DOI":null},{"DasID":46,"Acronym":null,"Citation":"Fockedey, N.; Mees, J.; Marine Biology Section - Ugent; (2003): Mysid shrimp populations in the Scheldt estuary.","StandardTitle":"Mysid shrimp populations in the Scheldt estuary","RelationID":1,"DOI":null}],"monographs":null,"monparts":null,"serparts":null,"BEntOpen":null,"BEntPrivate":null,"availability":[{"BInstID":140802,"LibID":36,"BRefID":12924,"EmbargoDate":null,"FullEmbargoDate":null,"PhysMedID":16,"hasOCRd":1,"ShelfLocCode":"140802","RFID":null,"PaidValue":null,"Medium":"Server","Description":"Interne VLIZ documenten","Acronym":"VLIZ","Library":"Vlaams Instituut voor de Zee","DutchTerm":"Non-open access","URL":null,"ClassifID":228,"Classification":"Non-open access","ReqLink":1,"ClassifTypID":3,"URLLocation":"https://www.vliz.be/imisdocs/publications/","SubDir":1,"InternalReq":1,"LoggedInReq":1,"Disclaimer":"Disclaimer_VLIZ_Intern","DutchDisclaimer":"<p>Deze publicatie is enkel beschikbaar voor persoonlijk gebruik binnen de Innovocean site <br />en mag op geen enkele manier verder worden verspreid.</p>","FileFormat":".pdf","FileDescr":"pdf","InsPub":1,"InsID":36,"FileFormID":6,"LendableFlag":1,"PublicFlag":1,"orderLib":"A","Notes":null,"AccConID":null,"AccessConstraint":null,"LicURL":null}],"litstyles":[{"LitStyID":7,"Style":"Dissertation"}],"thespers":[{"PersID":220,"Surname":"Coomans","Firstname":"August","Initials":"A.","Role":"Promotor"}],"arch2discl":null,"SERpubls":null,"MONpubls":null,"pictures":[],"thestermsPath":null,"thestermsASFA":null,"taxtermsASFA":null,"geotermsASFA":null,"collections":[{"Collection":"ScheldeMonitor","ShortName":"scheldemonitor"}],"conf":null,"proj":null,"Physdatasets":null,"spcols":{"5":{"SpName":"Belgian theses on marine topics","SpColID":5,"ParSpColID":396,"TopParID":396,"ShortName":"Belgian marine theses","URLLocation":null,"LibID":null,"OpenRepoFlag":0,"SpTypID":null,"TopParIDNotWebsite":396,"SpColPath":"vliz:biblio/Belgian marine theses"},"222":{"SpName":"BMB - 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