{"refrec":{"BRefID":5842,"RR":"<b>Degraer, S.</b> (1993). Studie van de macrofauna geassocieerd met zeegrassen in Gazi Bay (Kenya), met nadruk op de Crustacea = Study of the macrofauna, associated with seagrass in Gazi Bay (Kenya) with emphasis on the Crustacea. MSc Thesis. Universiteit Gent. Mariene Biologie. Instituut voor Dierkunde. Vakgroep Morfologie, Systematiek en Ecologie: Gent.  111p, figures and tables (150p) pp.","BEntID":5842,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":". MSc Thesis. Universiteit Gent. Mariene Biologie. Instituut voor Dierkunde. Vakgroep Morfologie, Systematiek en Ecologie: Gent.  111p, figures and tables (150p) pp.","DocTypID":5,"DocType":"Book/Monograph","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Degraer, S.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Degraer, S.","Englishabstract":"Few information is available about the macro-invertebrates of East-Africa and more specific about the epifauna of the East African seagrassbeds. In september 1993 seven stations were sampled in the seagrassbeds of Gazi Bay (Kenya). Three of them are situated in the major western and the small sidecreek and included <i>Cymodocea rotundata</i> and <i>C. serrulata</i>. Three other stations in the major eastern creek include the epifauna of <i>Thalassodendron ciliatum</i> and one <i>T. ciliatum</i> station is situated in the bay. Also the benthos of the seagrassbeds has been studied. A distinction was made between the leafs) the stalks and the roots (bottom) of the seagrasses. The faunal analysis of the epifauna associated with the seagrasses of Gazi Bay showed the Crustacea to be dominant: Amphipoda, Isopoda, Tanaidacea, Cumacea, Copepoda, and Ostracoda are the most important taxa. The Decapoda are represented by very small numbers. Especially the Amphipoda are numerous as epifauna of seagrasses. These six groups of Crustacea has been studied intensively. The animals are, if possible, identified up to the genus-level and a morphological descripition is given. Their occurrence in the study area, Gazi Bay, has been discussed. A key to the genera and families has been made. The table at the end of this summary shows the standardised densities of the six prominent groups of the Crustacea and the total faunal density of the stations, divided in leaf, stalk and roots. The structure of all the epifaunal taxa and the benthos of the seven stations has been investigated by two multivariate analysis techniques, TWINSPAN and CCA. The TWINSPAN-analysis showed a difference between the <i>Cymodocea</i>-community of the western creek and the sidecreek (three stations), the <i>Thalassodendron ciliatum</i>-community of the eastern creek (three stations), and the <i>T. ciliatum</i>-community of the bay (one station). These three communities can also be divided in a leaf-, a stalk-, and a rootgroup. Because of the indecent knowledge of the macro-invertebrates of East-Africa and the limited sampling, at this moment these groups can not be characterised by some typical species associations. Finally the two creeks, following a vegetative study of the eastern creek and the western creek, are comparised by means of densities and standing stocks of the epifauna and the benthos. It seems that the two creeks are quite different. The densities of the epifauna of the western creek (1653 ind/m²) are much lower than those of the eastern creek (21412 ind/m²). The densities of the benthos of the eastern creek (20085 ind/m²), on the contrary, are much lower than those of the western creek (46337 ind/m²); the consequence of these two facts is almost the same total density of macro-invertebrates in both creeks. The standing stocks follow the same trend. An indirect assessment of the standing stock of the eastern creek gives a value between 0,02 and 166 g DW/m², those of the western creek is found between 0,0238 and 192 g DW/m². So, the density of the epifauna of the seagrasses of the eastern creek is much higher than those of the western creek.","AbstractOtherLang":"De beperkte kennis inzake de macro-invertebraten van Oost-Afrika en meer specifiek de beperkte kennis van de epifauna van zeegrasvelden aldaar, dienden als aanzet tot het bestuderen van de macro-epifauna en het macrobenthos van deze zeegrasvelden. In september 1993 werden in de zeegrasvelden van Gazi Bay (Kenya) zeven stations bemonsterd. Drie daarvan zijn in de West- en de zijkreek gelegen en omvatten de epifauna van de zeegrassen <i>Cymodocea rotundata</i> en <i>C. serrulata</i>. Drie andere stations bevatten de epifauna van <i>Thalassodendron ciliatum</i> in de Oostkreek en één station de epifauna van <i>T. ciliatum</i> in de baai. Naast de epifauna werd ook de infauna van deze zeegrasvelden bestudeerd. Hierbij werd een onderscheid gemaakt tussen de bladeren, de stengels en de wortelsystemen (bodem) van de zeegrassen. De faunistische analyse van de epifauna geassocieerd met zeegrassen in Gazi Bay toonde aan dat de Crustacea dominant zijn: Amphipoda, Isopoda, Tanaidacea, Cumacea, Copepoda en Ostracoda vormden de belangrijkste groepen. De Decapoda kwamen in heel kleine aantallen voor. Voornamelijk de Amphipoda kwamen in grote aantallen voor als epifauna op de zeegrassen. De bovenvermelde zes groepen Crustacea werden van naderbij beschouwd. De aangetroffen dieren werden, waar mogelijk, gedetermineerd tot op genus-niveau en een morfologische beschrijving werd gegeven. Ook het voorkomen in het studiegebied, Gazi Bay, van deze genera werd besproken. Per groep werd tenslotte nog een determinatiesleutel opgesteld. De tabel aan het einde van deze samenvatting geeft de gestandaardiseerde densiteiten van de zes groepen Crustacea en de totale fauna densiteit in de verschillende stations, opgesplitst in blad, stengel en wortel, weer. Via multi-variate analyse-methoden (TWINSPAN & CCA) werd de structuur van alle taxa in de epifauna- en benthosgemeenschappen van de zeven stations onderzocht. Uit de TWINSPAN-analyse kon besloten worden dat de stations inderdaad gegroepeerd konden worden in drie verschillende gemeenschappen: de <i>Cymodocea</i>-gemeenschap in de Westkreek (drie stations), de <i>Thalassodendron ciliatum</i>-gemeenschap in de Oostkreek (drie stations) en de <i>T. ciliatum</i> in de baai (één station). Zelfs binnen deze drie gemeenschappen kon nog de opsplitsing gemaakt worden in blad, stengel en wortelfauna. Door de gebrekkige faunistische kennis over de macro-invertebraten van Oost-Afrika en de beperkte staalname, kunnen deze groepen niet éénduidig gekarakteriseerd worden door kenmerkende soorten. Ten slotte werden de twee kreken, in navolging van een vegetatieve studie van de Oosten de Westkreek, nog vergeleken wat betreft de densiteiten en de biomassa's van de epifauna en het benthos. Hieruit blijkt dat de twee kreken duidelijk verschillen van elkaar. De densiteiten van de epifauna van de Westkreek (1653 ind/m²) liggen veel lager dan deze van de Oostkreek (21412 ind/m²). Dit echter in tegenstelling tot het benthos, waar in de Oostkreek veel lagere densiteiten (20085 ind/m²) dan in de Westkreek (46337 ind/m²) worden waargenomen. Het gevolg van deze twee verschijnselen samen is dat de beide kreken gekenmerkt worden door ongeveer dezelfde totale densiteiten aan macro-invertebraten. Ook de biomassa volgt deze tendens. Een onrechtstreekse biomassa-schatting van de Oostkreek levert een waarde tussen 0,02 en 166 g DW/m², deze van de Westkreek ligt tussen 0,0238 en 192 g DW/m². Wat betreft de epifauna van de zeegrassen zelf, is de Oostkreek dus duidelijk rijker dan de Westkreek.","BibLvlCode":"M","StandardTitle":"Studie van de macrofauna geassocieerd met zeegrassen in Gazi Bay (Kenya), met nadruk op de Crustacea = Study of the macrofauna, associated with seagrass in Gazi Bay (Kenya) with emphasis on the Crustacea","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":"Kenya Belgium Project","OtherDescriptors":null,"Notes":null,"AnaPub":null,"MonPub":1993,"DateUpdate":"2013-11-27","DateCreate":"2001-01-26","SecASFANote":null,"ConfID":null,"PeerRev":null,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":null,"monrec":{"MonID":5842,"ISBN":null,"PubliDate":1993,"IssueDate":null,"Volume":null,"Issue":null,"Pagination":"111p, figures and tables (150p)","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":5842,"InsID":471,"Acronym":"UGent","FullStandardName":"Universiteit Gent","ToPubliDate":null,"SerNotes":null,"eISBN":null,"Pages":111},"serrec":null,"relations":null,"relationsRev":null,"addrec":{"Line1":"K.L. 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