{"refrec":{"BRefID":10787,"RR":"<b>Chavatte, N.</b> (2001). Het hyperbenthos van de Oosterschelde en de Westerschelde: seizoenaliteit en patronen op middellange termijn. MSc Thesis. Universiteit Gent. Marine Biologie. Instituut voor Dierkunde. Vakgroep Morfologie, Systematiek en Ecologie: Gent. 148 pp.","BEntID":10787,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":". MSc Thesis. Universiteit Gent. Marine Biologie. Instituut voor Dierkunde. Vakgroep Morfologie, Systematiek en Ecologie: Gent.  148 pp.","DocTypID":5,"DocType":"Book/Monograph","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Chavatte, N.","OrigTitleTranslFlag":1,"Authorstringtrunc":"Chavatte, N.","Englishabstract":"The objectives of this study are to study seasonal and spatial patterns in the hyperbenthos of the Oosterschelde and Westerschelde. In the Oosterschelde, a marine bay, samples were taken in the subtidal gullies, in the western (stations 5 and 10), central (stations 15 and 21), and eastern parts (station 29) and in the northern branch (station 38). In the Westerschelde, a true estuary with a marked salinity gradient, samples were taken at the subtidal border of the main channel: two samples were taken in the marine zone near the mouth of the estuary (stations 1 and 2), and two in the brackish water zone near the Dutch-Belgian border (stations 13 and 14). All samples were taken during daytime with a small hyperbenthic sledge ( opening 0.8 m² and mesh size 1 mm) at four campaigns between August 1999 and May 2000 (summer, spring autumn and winter) with the R.V. <i>Luctor</i> (CEMO, Yerseke, NL). The hyperbenthic community of both ecosystems are compared. Finally, the present data (1999-2000) of the hyperbenthos of the Westerschelde are compared with the data of 1990-1991 to reveal possible patterns on a mid-term temporal scale. In the past, the hyperbenthos of the Oosterschelde has been sampled only once in a limited pilot study (in the winter of 1988) at four stations. Therefore, this study is the first thorough assessment concerning the importance of the hyperbenthos in the Oosterschelde. Analysis of the hyper-benthic community structure was done using Hill's diversity indices, density data (number per surface and water volume sampled) and multivariate analyses in correlation with a limited selection of environmental variables. The hypotheses are: (1) the Oosterschelde harbours less hyperbenthic organisms than the Westerschelde because of its greater dominance of filter-feeding macrobenthic organisms (2) the water quality of the Westerschelde has improved over the last ten years (1990-2000), resulting in a more diverse and richer hyperbenthic fauna. A clear seasonal pattern can be observed in the hyperbenthos of the Oosterschelde. During summer, Anomura (<i>Pisidia longicornis</i> zoea larvae), Cnidaria (<i>Eucheilota maculata</i>) and Ctenophora (<i>Pleurobrachia pileus</i>) are the most dominant taxa. Also important during this season are Mysidacea (<i>Mesopodopsis slabberi</i>) and Brachyura (<i>Macropodia rostrata</i> zoea larvae), followed by Caridea (<i>Crangon crangon</i> zoea larvae), Gammaridea (<i>Microdeutopus species</i>) and Polychaeta (<i>Nereis succinea</i>). The highest number of species (59) are found in summer, most of them belonging to the merohyper-benthos. A strong correlation exists between the hyperbenthos and high temperatures and low oxygen concentrations during summer. Gammaridea (<i>Microdeutopus species</i>) and Ctenophora (<i>Pleurobrachia pileus</i>) are dominant in autumn. Also important are Mysidacea (<i>Mesopodopsis slabberi</i>), spat of Bivalvia and Polychaeta (<i>Nereis succinea</i>). The autumn community is correlated with high turbidity values. Lowest hyperbenthic densities are observed in winter. Only holohyperbenthic organisms occured, in particular Ctenophora (<i>Pleurobrachia pileus</i>) and Mysidacea (<i>Schistomysis spiritus</i>). Spring coincides with the highest hyperbenthic densities (on average 4000 ind./1000 m²), most of which are Ctenophora (<i>Pleurobrachia pileus</i>) and Brachyura (<i>Carcinus maenas</i> zoea larvae). Anomura (<i>Pagurus bernhardus</i> zoea larvae), Polychaeta (<i>Lanice conchilega</i> larvae) and Pisces (<i>Pomatoschistus</i> species postlarvae) are also common. As in summer, spring is dominated by merohyperbenthos. In spring, the water has high pH-values and high oxygen concentrations, which are correlated with a <i>Phaeocystis</i> bloom. The spatial patterns in the hyperbenthic community of the Oosterschelde are less pronounced in comparison with the seasonal patterns. Still, there are a few differences between the stations. All stations have high Ctenophor","AbstractOtherLang":"Het doel van deze scriptie is de seizoenaliteit en de ruimtelijke patronen in het hyperbenthos van de Oosterschelde en de Westerschelde te bestuderen. In de Oosterschelde, een mariene baai, werden stalen genomen in de diepere geulen (subtidaal) ter hoogte van de monding (stations 5 en 10), het centrale deel (stations 15 en 21), de kom (station 29) en de noordelijke tak (station 38). In de Westerschelde, een echt estuarium, werden stalen genomen aan de rand van de hoofdvaargeul (eveneens subtidaal) en werd geopteerd om twee stalen uit de mariene zone (stations 1 en 2) en twee stalen uit de brakwaterzone (stations 13 en 14) uit te werken. Alle stalen werden overdag genomen met een hyperbenthische slee (0.8 m² opening en maaswijdte 1 mm) tijdens driemaandelijkse campagnes in de periode augustus 1999-mei 2000 met de R. V. <i>Luctor</i> (CEMO, Yerseke, NL). De hyperbenthische gemeenschappen van beide systemen worden met elkaar vergeleken. Tenslotte worden de huidige gegevens (1999-2000) van het hyperbenthos van de Westerschelde vergeleken met de gegevens van 1990-1991 om mogelijke patronen op middellange termijn op te sporen. Het hyperbenthos van de Oosterschelde werd voordien nog maar éénmaal - en in een zeer beperkte pilootstudie van vier stations in de winter van 1988 - bekeken. Deze scriptie vormt dan ook het eerste grondige onderzoek naar het belang van het hyperbenthos in de Oosterschelde. De analyse van de hyperbenthische gemeenschappen gebeurde aan de hand van de vier diversiteitsindices van Hill, densiteitsgegevens (in aantallen per oppervlakte- en volume-eenheid) en verschillende multivariate analyses in correlatie met een beperkt aantal omgevingsvariabelen. De vooropgestelde hypothesen zijn: (1) de Oosterschelde bevat minder hyperbenthische organismen dan de Westerschelde omwille van een hogere dominantie van filtrerende macrobenthische organismen, en (2) de Westerschelde is in 2000 rijker aan hyperbenthos dan in 1990 omwille van een verbeterde waterkwaliteit. In het hyperbenthos van de Oosterschelde overheerst het seizoenaal patroon. Tijdens de zomer vormen de Anomura (zoealarven van <i>Pisidia longicornis</i>), de Cnidaria (<i>Eucheilota maculata</i>) en Ctenophora (<i>Pleurobrachia pileus</i>) de belangrijkste taxa. Ook nog van enig belang tijdens dit seizoen zijn de Mysidacea (<i>Mesopodopsis slabberi</i>) en de Brachyura (zoealarven van <i>Macropodia rostrata</i>), gevolgd door Caridea (zoealarven van <i>Crangon crangon</i>), Gammaridea (<i>Microdeutopus species</i>) en Polychaeta (<i>Nereis succinea</i>). Tevens worden tijdens de zomer de meeste soorten aangetroffen (59), die hoofdzakelijk behoren tot het merohyperbenthos. Er is een sterke correlatie tussen het hyperbenthos en de hogere temperaturen en lagere zuurstofconcentraties tijdens de zomermaanden. De herfst wordt gedomineerd door Gammaridea (<i>Microdeutopus species</i>) en Ctenophora (<i>Pleurobrachia pileus</i>). Eveneens belangrijk zijn Mysidacea (<i>Mesopodopsis slabberi</i>), spat van Bivalvia en Polychaeta (<i>Nereis succinea</i>). De herfstgemeenschap is het sterkst gekorreleerd met een hoge turbiditeit. De laagste densiteiten worden genoteerd in de winter en tijdens dit seizoen komen enkel holohyperbenthische organismen voor, vooral Ctenophora (<i>Pleurobrachia pileus</i>)en Mysidacea (<i>Schistomysis spiritus</i>). In de lente neemt men de hoogste densiteiten waar (gemiddeld 4000 ind./1000 m²), die vooral bepaald worden door Ctenophora (<i>Pleurobrachia pileus</i>) en Brachyura (zoealarven van <i>Carcinus maenas</i>). Anomura (zoealarven van <i>Pagurus bernhardus</i>), Polychaeta (<i>Lanice conchilega</i> larven) en Pisces (postlarven van <i>Pomatoschistus</i> species) zijn ook dominante taxa tijdens de lente. Net als in de zomer overheerst het merohyperbenthos in de lente. De lente vertoont een hoge pH en hoge zuurstofconcentraties wat gecorreleerd is met een <i>Phaeocystis</i> bloei. De ruimtelijke patronen in het hyperbenthos van de Oosterscheld","BibLvlCode":"M","StandardTitle":"Het hyperbenthos van de Oosterschelde en de Westerschelde: seizoenaliteit en patronen op middellange termijn","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":2001,"DateUpdate":"2022-09-21","DateCreate":"2001-06-07","SecASFANote":null,"ConfID":null,"PeerRev":0,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":null,"monrec":{"MonID":10787,"ISBN":null,"PubliDate":2001,"IssueDate":null,"Volume":null,"Issue":null,"Pagination":"148","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":10787,"InsID":471,"Acronym":"UGent","FullStandardName":"Universiteit Gent","ToPubliDate":null,"SerNotes":null,"eISBN":null,"Pages":148},"serrec":null,"relations":null,"relationsRev":null,"addrec":null,"othpubs":null,"ownerships":null,"authors":[{"AutName":"Chavatte","Firstname":"Natascha","Initials":"N.","Affiliation":null,"Discriminator":null,"CorporateFlag":0,"BEntID":10787,"AutID":15121,"OrderNr":1,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":null,"ORCID":null,"PersID":2519,"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). 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