{"refrec":{"BRefID":19556,"RR":"<b>Van Gaever, S.</b> (2001). Gemeenschapsanalyse van macrofauna geassocieerd met koudwaterkoraalriffen in de NO Atlantische Oceaan. MSc Thesis. Universiteit Gent (RUG): Gent. 110 pp.","BEntID":19556,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":". MSc Thesis. Universiteit Gent (RUG): Gent.  110 pp.","DocTypID":5,"DocType":"Book/Monograph","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Van Gaever, S.","OrigTitleTranslFlag":1,"Authorstringtrunc":"Van Gaever, S.","Englishabstract":"Deep-water corals are widespread ecosystems that occur at many locations throughout the world. These corals have a bathymetric distribution from 0 m to a depth of 6200 m, they also occur in the dark, cold, upper bathyal zone of the ocean. Although these deep-water corals were first recorded in the 18th century, they only have received much attention during the last ten years. These unique ecosystems are threatened by the increasing human exploration of the natural sources of the continental slopes. <i>Lophelia pertusa</i> (Linnaeus 1758) is a reefbuilding and very common deep-water coral. Scientists presume even that the associated fauna of <i>Lophelia</i> would be as divers as the fauna occurring in the tropical coral reefs. The purpose of this thesis is to make an analysis of the associated community of <i>Lophelia pertusa</i> in the North-East Atlantic. In this area occur several clusters of carbonate mounds, (Henriet et al. 1998). The deep-water corals are situated on the flanks and the summits of these mounds. The samples analysized in this study were taken in three different areas of the NE Atlantic southwest of Ireland: the Porcupine Seabight, the Porcupine Bank and the Rockall Bank. Rogers (1999) presented a list of 886 species that were found on or in a <i>Lophelia pertusa</i> reef. Further studies of Mortensen et al. (1995) and De Bergé (1999) also made supplementary lists. Of the 142 different species found in this study, there were 58 species that were not mentioned in these lists. These organisms are in this study probably for the first time found in association with <i>Lophelia</i>. The reef community of <i>Lophelia</i> will be much more divers than known so far, and further research is necessary. Just like in previous studies the Polychaeta are the most dominant group with the highest number of species and individuals (Jensen & Frederiksen 1992 ; De Bergé 1999). Also the Crustacea, Nematoda and Ophiuroidea are very abundant groups in the samples analysed in this study. From the ecology of the most abundant species appeared that many of these species have a large bathymetric distributions and that they are often widespread organisms. The idea of Dons (1944) that the associated fauna of <i>Lophelia pertusa</i> is a unique community, is difficult to accept. Also later studies are of the opinion that these fauna is not typical for this habitat (Burdon-Jones & Tambs-Lyche 1960; Jensen & Frederiksen 1992). The associated fauna will probably consist of species that have developed a specific adaptation to the coral reef but that also occur elsewhere, and species that are casual immigrants from the nearby habitats. The comparison of the samples with sediment showed that the endofaunas from the Porcupine Seabight and from the Porcupine Bank have many different species, but that they have a similar composition on an higher taxonomic level. It was obvious that the sediment from the samples without coral or sponge had a very poor fauna. The area between the mounds and where no <i>Lophelia</i> reef occur had a much less divers fauna than the <i>Lophelia</i> reefs. The comparison of the two nearby mounds in the Porcupine Seabight showed that even on a small scale there is a high variety of associated species. In the samples analysed in this study, the microhabitat sediment was the most biodivers microhabitat, followed by the dead coral skeleton. In general this <i>Lophelia</i> skeleton is in the different regions the microhabitat with the highest diversity index (Mortensen et al. 1995 ; Jensen & Frederiksen 1992). Some groups of the fauna are mainly associated with a certain microhabitat: the nematodes (> 1 mm) are especially found in the sediment, while the bivalves and the brittle stars are clearly more abundant on the dead coral. From the literature study it appeared that the <i>Lophelia</i> reefs in the Porcupine Seabight have a slightly less biodiversity than the <i>Lophelia</i> reefs and other deep-water coral reefs in o","AbstractOtherLang":"Diepwaterkoralen zijn wijd verspreide ecosystemen die voorkomen over de gehele wereld. Deze koralen hebben een bathymetrische distributie van 0 tot 6200 m diep (Mortensen 2000). Zij komen dus ook voor in de donkere, koude, bovenste bathyale zone van de oceaan. Niettegenstaande dat deze diepwaterkoralen reeds in de 18de eeuw zijn ontdekt, wordt er pas sinds de laatste tien jaren veel aandacht aan deze koralen geschonken. Deze unieke ecosystemen worden namelijk sterk bedreigd door de stijgende antropogene exploitatie van de natuurlijke bronnen van de continentale hellingen. Eén van deze diepwaterkoralen die zeer algemeen is en net als tropische koralen rifbouwend is, is het koraal <i>Lophelia pertusa</i> (Linnaeus 1758). Men vermoedt dat de fauna die in associatie met <i>Lophelia</i> voorkomt zelfs even soortenrijk is als de fauna die leeft in de tropische koraalriffen. Het doel van deze scriptie was het maken van een gemeenschapsanalyse van de geassocieerde macrofauna van <i>Lophelia pertusa</i> in de Noord-Oost Atlantische Oceaan. In dit gebied zijn talrijke clusters van 'carbonate mounds' gelegen (Henriet et al. 1998). De diepwaterkoraalriffen bevinden zich voornamelijk op de flanken en de toppen van deze mounds. De stalen voor deze studie werden bemonsterd in drie verschillende gebieden van de NO Atlantische Oceaan, meerbepaald ten zuidwesten van Ierland: de Porcupine Seabight, de Porcupine Bank en de Rockall Bank. Rogers (1999) maakte een lijst van 886 soorten die op of in een <i>Lophelia pertusa</i> rif gevonden zijn. Latere studies van Mortensen et al. (1995) en De Bergé (1999) toonden aanvullende lijsten van soorten. Van de 142 soorten die in deze studie werden gevonden, waren er maar liefst 58 soorten die niet vermeld staan in de bovenvermelde lijsten. Deze dieren zijn dus hoogstwaarschijnlijk in deze studie voor het eerst in associatie met <i>Lophelia</i> aangetroffen. De rifgemeenschap van <i>Lophelia</i> zal dus nog veel diverser zijn dan tot nu toe is gekend, en verder onderzoek van stalen is hoogstnoodzakelijk. Net als in vorige studies zijn de Polychaeta zowel in soortenrijkdom als in abundantie de dominantste groep van de geassocieerde macrofauna (Jensen & Frederiksen 1992 ; De Bergé 1999). Verder zijn in deze stalen ook de Crustacea, de Nematoda en de Ophiuroidea zeer abundante groepen. Uit de ecologie van de meest abundante soorten blijkt dat veel van deze soorten een grote bathymetrische distributie hebben en dikwijls algemeen verspreid zijn. De stelling van Dons (1944) dat de geassocieerde fauna van <i>Lophelia pertusa</i> een unieke gemeenschap is, is dus moeilijk aanvaardbaar. Ook latere onderzoeksprojecten zijn van mening dat deze fauna niet typisch is voor dit habitat (Burdon-Jones & Tambs-Lyche 1960 .Jensen & Frederiksen 1992). Waarschijnlijk zal deze fauna bestaan uit soorten die reeds een specifieke adaptatie aan het koraalrif hebben ontwikkeld maar ook elders voorkomen, en uit soorten die toevallige immigranten uit de naburige habitats zijn. Uit de vergelijking van de sedimentstalen komt naar voor dat de endofauna's uit de Porcupine Seabight en uit de Porcupine Bank sterk verschillen in soortensamenstelling maar gelijkaardig zijn op hoger taxonomisch niveau. Het was duidelijk dat het sediment uit de stalen waar geen koraal of spons aanwezig was, een zeer arme endofauna had. Het gebied gelegen tussen de 'mounds' en waar dus geen diepwaterrif voorkomt heeft een veel minder diverse fauna dan de <i>Lophelia</i> riffen. De vergelijking van twee naburige mounds in de Porcupine Seabight toont aan dat de geassocieerde fauna op soortniveau ook op een kleine schaal sterk varieert. In deze stalen was het microhabitat sediment het meest biodiverse microhabitat, en vervolgens het dood koraalskelet. Algemeen is dit <i>Lophelia</i> skelet in de verschillende regio's het microhabitat met de hoogste diversiteitsindex (Mortensen et al. 1995 ; Jensen & Frederiksen 1992). Bepaalde groepen zijn voornamelijk geassocieerd m","BibLvlCode":"M","StandardTitle":"Gemeenschapsanalyse van macrofauna geassocieerd met koudwaterkoraalriffen in de NO Atlantische Oceaan","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":"2020-04-27","DateCreate":"2001-10-11","SecASFANote":null,"ConfID":null,"PeerRev":0,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":null,"monrec":{"MonID":19556,"ISBN":null,"PubliDate":2001,"IssueDate":null,"Volume":null,"Issue":null,"Pagination":"110","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":19556,"InsID":13,"Acronym":"MARBIOL","FullStandardName":"Universiteit Gent; 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