{"refrec":{"BRefID":5800,"RR":"<b>Aerts, K.</b> (2000). Intertidaal endobenthos van de Baai van Valdivia (Ecuador). MSc Thesis. University of Gent, Zoology Institute, Marine Biology Section: Gent.  104 pp.","BEntID":5800,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":". MSc Thesis. University of Gent, Zoology Institute, Marine Biology Section: Gent.  104 pp.","DocTypID":5,"DocType":"Book/Monograph","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Aerts, K.","OrigTitleTranslFlag":1,"Authorstringtrunc":"Aerts, K.","Englishabstract":"The endobenthos of the Bay of Valdivia (Ecuador) was investigated in August-September 1999. At high tide, Ecuadorean beaches are flooded by seawater. This water contains very rich shrimp populations (mostly juveniles), which form the source of the important shrimp aquaculture in Ecuador. Biological characterization of these beaches was never done, leading to the importance of this work This thesis is part of a IUS-VLIR-ABOS project, being a cooperation between the University Ghent (Belgium) and ESPOL (Escuela Superior Politechnica del Litoral, Ecuador). The goal of this study was to investigate structural characteristics of the endobenthos on an Ecuadorean beach and to relate these to beach profiles and sediment composition. In doing so, zonational patterns would be detected to be used as a first step for sustainable management of these beaches. Six transects, scattered over the entire Bay of Valdivia were once sampled for macro- and meiobenthos. The six different sampling areas for every transect are situated in the intertidal area, including the dry beach. The depth of the samples in the sediment was 15 cm for macrobenthos and 10 cm for meiobenthos. On every sampling area three replicates were taken. All 108 macrobenthos replicates were worked out, while for meiobenthos only 36 replicates were processed. With the help of two dimensionless parameters; the dimensionless fall velocity and the relative tide range, the six transects can be characterized as 'intermediate' beaches of the type \"Low Tide Bar Rip\". The average density over the entire bay is 62 individuals per m². The macrofauna of the sampled beaches consists mainly of Mollusca with a total average density of 286 ind/m² for the entire bay. The most abundant species is the gastropod <i>Olivella semistriata</i>. Crustacea form a smaller part (total average density: 67 ind/m²). Ten species of this taxon were found , which makes it the most diverse. Important species are: <i>Haustorius sp., Excirolana braziliensis</i> and <i>Emerita rathbunae</i>. The density of the Polychaeta species is much smaller than those of the two other taxa (total average density: 13 ind/m²). Mollusca, Crustacea and Polychaeta were reported to be the three most important taxa on sandy beaches The highest total macrobenthos density was reported for the zone between 1.4 m and 2.4 m height (compared to Low Mean Water Springtide, LMWS). Below 1.4 m, total macrobenthic densities on the different beaches remain stable. There is no density increase towards of the subtidal area. The diversity however raises continuously from the higher to the lower beach. Generally, it was noted that the three northern beaches contain as much higher densities and diversities than the three southern beaches. Different multivariate analyses were carried out on the density data. TWINSPAN, as well as clusteranalysis and ordination led to comparable results. The spatial patterns of the macrobenthos are mainly determined by height and sediment characteristics, i.e. percentage mud and percentage very fine sand. Three communities can be distinguished; a High Beach Community, an Intermediate Beach Communitx and a Low Beach Communitx . The High Beach Community is dominantly situated on the dry beach and is characterized by Crustacea with the isopod <i>Excirolana braziliensis</i> as the most dominant species (average 143 ind/m²). Additionally, ghost crabs (Ocypode) appear in large numbers above the high tide swash limit. Besides Crustacea, different Insecta species are also present. Comparable with the Intermediate Beach Community, the lower beach is dominated by the gastropod <i>Olivella semistriata</i> (average 575 ind/m², resp. 129 ind/m²) On the intermediate beach Crustacea are also abundant. Here <i>Haustorius</i> sp. reaches its maximal average density, with namely 91 ind/m². Besides Mollusca, other taxa, such as Polychaeta, Crustacea, Nemertea and Echinodermata are found on the lower beach. Polychaeta have their maximum dist","AbstractOtherLang":"Het endobenthos van de Baai van Valdivia (Ecuador) werd bemonsterd in augustus-september 1999. Ecuadoriaanse stranden worden bij hoog tij overspoeld door zeewater met zeer rijke garnalenpopulaties (meestal juvenielen) die de bron vormen van de belangrijke garnalenaquacultuur in Ecuador. De biologische karakterisatie van deze stranden is echter totnogtoe niet gebeurd, vandaar het belang van dit eindwerk. Dit werk kadert in een IUS-VLIR-ABOS project wat een samenwerking is tussen de Universiteit Gent en ESPOL (Escuela Politechnica del Litoral). De doelstelling van deze studie was om de structurele karakteristieken van het endobenthos op een Ecuadoriaans zandstrand te bepalen en deze te relateren aan strandprofielen en sedimentsamenstelling. Op die manier kunnen zonatiepatronen vastgelegd worden als een eerste stap voor een duurzaam beheer van deze stranden. Zes transecten, verspreid over de gehele Baai van Valdivia werden zowel voor macro-als voor meiobenthos eenmalig bemonsterd. De zes verschillende staalnameplaatsen per traject lagen verspreid tussen de hoogwaterlijn en de laagwaterlijn. Bovendien werden ook stalen genomen van het droge strand. De diepte van de monsters in het sediment is voor macrobenthos 15 cm en voor meiofauna 10 cm. Per staalnameplaats werden drie replicaten genomen. Voor macrofauna werden alle 108 replicaten verwerkt, voor meiofauna werden slechts 36 replicaten verwerkt. Aan de hand van twee dimensieloze parameters, nl. de dimensieloze valsnelheid (Omega) en de relatieve getijderange (RTR) kunnen de transecten gekarakteriseerd worden als 'intermediaire' stranden van het type 'Low Tide Bar/Rip'. De macrofauna van de bemonsterde stranden bestaat voornamelijk uit Mollusca met een totale gemiddelde densiteit over de gehele baai van 286 ind/m². De meest abundante soort is de gastropode <i>Olivella semistriata</i>. Een kleiner aandeel wordt ingenomen door Crustacea (totale gemiddelde densiteit: 67 ind/m²), weliswaar met 10 soorten, wat als gevolg heeft dat dit het meest diverse taxon is. Belangrijke soorten zijn: <i>Haustorius sp., Excirolana braziliensis</i> en <i>Emerita rathbunae</i>. De densiteiten van Polychaeta, het derde belangrijke taxon op zandstranden liggen veel lager dan die van de overige twee (totaal gemiddelde 13 ind/m²). De hoogste totale densiteiten (macrobenthos) worden geregistreerd tussen 1.4 m en 2.4 m hoogte (t.o.v. de Gemiddelde LaagWaterlijn bij Springtij, GLWS) en dit voor <i>Olivella semistriata</i>. Beneden de 1.4 m blijven de totale densiteiten ongeveer gelijk. Er is geen opvallende densiteitstoename naar het subtidaal toe op te merken. De diversiteit daarentegen stijgt continu van het hoog- naar het laagstrand. Algemeen wordt vastgesteld dat de drie noordelijke transecten zowel hogere densiteiten als grotere diversiteiten kennen dan de drie zuidelijke transecten. De gemiddelde densiteit over het gehele strand bedraagt 62 individuen per m². Verschillende multivariate analyses werden uitgevoerd op de gegevens van densiteit. Zowel TWINSPAN, clusteranalyse als ordinatie komen tot vergelijkbare resultaten. De verspreiding van het macrobenthos wordt voornamelijk bepaald door de hoogte en de sedimentkarakteristieken: percentage slib en percentage zeer fijn zand. Drie gemeenschappen worden onderscheiden nl. een Hoog Strandgemeenschap, een lntermediaire Strandgemeenschap en een Laag Strandgemeenschap. De Hoog Strandgemeenschap bevindt zich overwegend op het droge strand en wordt gekenmerkt door Crustacea met als dominante soort de isopode <i>Excirolana braziliensis</i> (gem. 143 ind/m²). Bovendien komen ocypodide krabben met enorme aantallen voor net hoven de hoogtij swash limiet. Naast Crustacea zijn er verschillende Insecta species aanwezig. Zowel de Intermediaire Strandgemeenschap als het lage strand worden gedomineerd door de gastropode <i>Olivella semistriata</i> (gem. 575 ind/m², resp. gem.129 ind/m²). Verder zijn op het intermediaire strand de Crustacea vrij abundant. <i>Haustorius</i","BibLvlCode":"M","StandardTitle":"Intertidaal endobenthos van de Baai van Valdivia (Ecuador)","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":2000,"DateUpdate":"2011-10-04","DateCreate":"2001-01-24","SecASFANote":null,"ConfID":null,"PeerRev":null,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":null,"monrec":{"MonID":5800,"ISBN":null,"PubliDate":2000,"IssueDate":null,"Volume":null,"Issue":null,"Pagination":"104","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":5800,"InsID":13,"Acronym":"MARBIOL","FullStandardName":"Universiteit Gent; Faculteit Wetenschappen; Vakgroep Biologie; Onderzoeksgroep Mariene Biologie","ToPubliDate":null,"SerNotes":null,"eISBN":null,"Pages":104},"serrec":null,"relations":null,"relationsRev":null,"addrec":null,"othpubs":null,"ownerships":null,"authors":[{"AutName":"Aerts","Firstname":"Katrien","Initials":"K.","Affiliation":null,"Discriminator":null,"CorporateFlag":0,"BEntID":5800,"AutID":9687,"OrderNr":1,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":null,"ORCID":null,"PersID":3915,"InsID":null}],"mapdetails":null,"datasets":null,"monographs":null,"monparts":null,"serparts":null,"BEntOpen":null,"BEntPrivate":null,"availability":[{"BInstID":226592,"LibID":36,"BRefID":5800,"EmbargoDate":null,"FullEmbargoDate":null,"PhysMedID":16,"hasOCRd":1,"ShelfLocCode":"226592","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":19,"Surname":"Vincx","Firstname":"Magda","Initials":"M.","Role":"Promotor"}],"arch2discl":null,"SERpubls":null,"MONpubls":null,"pictures":[],"thestermsPath":null,"thestermsASFA":null,"taxtermsASFA":null,"geotermsASFA":null,"collections":null,"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 - Belgische Mariene Bibliografie","SpColID":222,"ParSpColID":null,"TopParID":null,"ShortName":"BMB","URLLocation":null,"LibID":36,"OpenRepoFlag":null,"SpTypID":null,"TopParIDNotWebsite":null,"SpColPath":"BMB"},"422":{"SpName":"Section Marine Biology","SpColID":422,"ParSpColID":null,"TopParID":null,"ShortName":"MarBiol","URLLocation":null,"LibID":null,"OpenRepoFlag":null,"SpTypID":null,"TopParIDNotWebsite":null,"SpColPath":"MarBiol"},"396":{"SpName":"VLIZ Bibliographies","SpColID":396,"ParSpColID":null,"TopParID":null,"ShortName":"vliz:biblio","URLLocation":null,"LibID":null,"OpenRepoFlag":null,"SpTypID":null,"TopParIDNotWebsite":null,"SpColPath":"vliz:biblio"}},"doi":null,"publs":[{"PublID":1886,"PublName":"University of Gent, Zoology Institute, Marine Biology Section","InsID":null,"PersID":null,"INBOID":null,"OrderNr":1}],"serparttypes":null,"monauthors":null,"MParts":null,"SParts":null,"hLibs":null,"langs":[{"BEntID":5800,"AbstractFlag":0,"LangID":15,"LangCode":"en","Lang":"English","DutchTerm":"Engels","LangCodeExtended":"eng"},{"BEntID":5800,"AbstractFlag":0,"LangID":17,"LangCode":"es","Lang":"Spanish","DutchTerm":"Spaans","LangCodeExtended":"spa"},{"BEntID":5800,"AbstractFlag":0,"LangID":41,"LangCode":"nl","Lang":"Dutch","DutchTerm":"Nederlands","LangCodeExtended":"dut"},{"BEntID":5800,"AbstractFlag":1,"LangID":17,"LangCode":"es","Lang":"Spanish","DutchTerm":"Spaans","LangCodeExtended":"spa"}],"urls":null,"thesterms":null,"taxterms":null,"geoterms":null,"othterms":null,"asfacodes":null,"asfa2codes":null,"thestermsFRIS":null,"taxtermsFRIS":null,"geotermsFRIS":null,"othtermsFRIS":null,"resmessage":"","complete":1,"sessions":{"newSesName":"Haspeslagh, Jan, J.","newSesDate":{"date":"2001-01-24 08:36:27.643000","timezone_type":3,"timezone":"Europe/Brussels"},"updSesName":"Haspeslagh, Jan, J.","updSesDate":{"date":"2011-10-04 10:20:17.023000","timezone_type":3,"timezone":"Europe/Brussels"}}}