{"refrec":{"BRefID":6134,"RR":"<b>Dahdouh-Guebas, F.</b> (2001). Mangrove vegetation structure, dynamics and regeneration. PhD Thesis. Free University Brussels. Faculty of Sciences. Mangrove Management Group. Laboratory of General Botany and Nature Management: Brussel.  317 pp.","BEntID":6134,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":". PhD Thesis. Free University Brussels. Faculty of Sciences. Mangrove Management Group. Laboratory of General Botany and Nature Management: Brussel.  317 pp.","DocTypID":5,"DocType":"Book/Monograph","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Dahdouh-Guebas, F.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Dahdouh-Guebas, F.","Englishabstract":"The present PhD dissertation is composed of fourteen papers, preceded by a general introduction and followed by an epilogue that explains the entire research framework, including the links between the different case-studies, the local and global applicability of the results and the relevance of the work in the framework of development co-operation. The bulk of the research was carried out in four sites in Kenya and Sri Lanka: Gazi Bay and Mida Creek in Kenya, and Unawatuna-Galle and Pambala-Chilaw in Sri Lanka. After a revision of the often controversial issue of the floral composition of mangroves in Sri Lanka (SW coast), followed by a synthesis of image attributes in the interpretation of aerial photographs in Kenya and Sri Lanka, a series of case-studies are presented which cover the study of mangrove vegetation structure dynamics (incl. zonation issues), mangrove regeneration and regenerative constraints (in particular propagule predation). Gazi and Galle appeared to be more disturbed than Mida and Pambala. The studies of these disturbed sites show different types of structural changes in vegetation over time, as well as the existence of interactions between the mangrove and terrestrial vegetation (sedges and coconut plantation). Parallel investigation of the adult, young and juvenile vegetation layers in combination with sequential aerial photography from the past allow an understanding of the dynamic processes and a prediction of the future forest structure, the latter subject to different scenarios (no change, mangrove cutting, natural hazards, etc.). This approach allows for the decision if a certain mangrove stand has the potential to successfully renew and rejuvenate or if anthropogenic pressure renders human interference such as restoration imperative. In the framework of re-afforestation programs the study of the fate of mangrove juveniles in rehabilitation plots is essential. Whereas the monitoring of mangrove regeneration provides information on the general status of mangrove juveniles, the study of propagule predation in particular has shown that crabs and gastropods may constitute a problem for the successful regeneration of mangroves in Kenya and Sri Lanka. Results also show how propagule predation is one link in the chain of events that leads to a particular vegetation structure (zoned or unzoned), and how hydrology and anthropogenic pressure may possibly influence it. The outcome therefore gives direct information for forest management issues by identifying the species, the areas and the processes that are likely to display higher propagule predation rates. Another aspect of mangrove regeneration is more directed towards natural regeneration conditions, more specifically in biogeographical limit situations such as in the Parc National du Banc d' Arguin (Mauritania), a World Heritage Site where the mangroves of the West-African coast reach their northernmost distribution. As a biogeographically marginal, monospecific mangal in an area where freshwater availability has decreased over the last decades, concern about the survival of the mangroves has been expressed. However, except for inappropriate topographical conditions (mangroves growing in terrestrial locations, with little chance for propagule survival) the mangrove did not show signs of reduced vitality at its biogeographical limit, but even displayed a diversity of vegetation structure types (high trees, wide trees, shrub formations and 'sebkha' formations). An empirical revisit of the Point-Centred Quarter Method (PCQM) prompted by fieldwork experience, tackles the problems associated with this method, such as ambiguous tree architectural settings for measuring the tree diameter, aggregation of trees or the over- or under-estimation of the density and the basal area. The factor by which the latter occurs, apparently is influenced by the vegetation structure of the forest. The final paper provides an integrated review of mangrove vegetation structure dynamics based on existing literature as well as on the previous case-studies and summarises and defines the different types of vegetationstructure dynamics.","AbstractOtherLang":"Deze doctoraatsthesis bestaat uit veertien manuscripten, voorafgegaan door een algemene inleiding en gevolgd door een epiloog dat het gehele onderzoekskader uitlegt, inclusief de verbanden tussen de verschillende casestudies, de lokale en globale toepasbaarheid van de resultaten en de relevantie van het werk in het kader van ontwikkelingssamenwerking. Het grootste gedeelte van het onderzoek werd uitgevoerd in vier sites in Kenia en Sri Lanka: Gazi Bay en Mida Creek in Kenia, en Unawatuna-Galle en Pambala-Chilaw in Sri Lanka. Na een revisie van het vaak controversiele debat rond de floristische samenstelling van mangroven in Sri Lanka (zuid-west kust), gevolgd door een synthese van beeldattributen gebruikt in de interpretatie van luchtfoto's in Kenia en Sri Lanka, wordt een opeenvolging van case-studies gepresenteerd die de studie van de dynamiek van de vegetatiestructuur (incl. zonatie), mangrove-regeneratie en regeneratie-beperkende factoren (in het bijzonder propagulepredatie) overkoepelen. Gazi en Galle bleken meer verstoord dan Mida en Pambala. De studie van deze verstoorde sites tonen aan dat er zich in de tijd verschillende types structure le veranderingen in de vegetatie voordoen, en wijzen eveneens op het bestaan van interacties tussenmangrove- en terrestrische vegetatie (cypergrassen en cocosaanplantingen). Gelijktijdig onderzoek m.b.t. de adulte, de jonge en de juveniele vegetatielagen, in combinatie met sequentiele luchtfotografie uit het verleden, laten toe de dynamische processen te begrijpen en een voorspelling te doen m.b.t. de toekomstige structuur van het woud, deze laatste onder verschillende scenario's (geen verandering, mangrovekap, natuurlijke catastrofen, enz.). Deze aanpak laat toe om te beslissen of een bepaald mangrovebestand het potentieel heeft om op een successvolle manier te vernieuwen en te verjongen of dat de anthropogene druk een menselijk ingrijpen onder de vorm van bijv.restauratie noodzakelijk maakt. In het kader van herbebossingsprojecten is de studie van het lot van mangrovejuvenielen in rehabilitatieproefvlakken essentieel. Daar waar de monitoring van mangroveregeneratie informatie genereert over de algemene status van de mangrovejuvenielen, toont de studie van propagulepredatie aan dat in het bijzonder krabben en slakken een probleem kunnen vormen voor de successvolle regeneratie van mangroven in Kenya en Sri Lanka. Resultaten wijzen ook aan hoe propagulepredatie een schakel is in de keten van evenementen die tot een bepaalde vegetatiestructuur (gezoneerd of niet-gezoneerd) leidt, en hoe hydrologie of antmopogene druk dit mogelijk beinvloeden. De uitkomst geeft dus directe informatie voor het bosbeheer door de soorten, de gebieden en de processen te identificeren die mogelijk leiden tot een meer intense propagulepredatie. Een ander aspect van de mangroveregeneratie is gericht naar natuurlijke regeneratieornstandigheden, meer bepaald in de biogeografische limietsituatie zoals die van het Parc National du Banc d' Arguin (Mauretanie), een Wereld Heritage Site waar de mangroven van de West-Afrikaanse kust hun noordelijke areaalgrens bereiken. In deze biogeografisch marginale, monospecifieke mangrove, gelegen in een gebied waar de zoetwatervoorziening is gedaald gedurende de laatste decennia, was er bezorgdheid in verband met de overleving van de mangroven. Echter, met uitzondering van ongeschikte topografische condities (mangroven die groeien in terrestrische locaties, met weinig kans op overleving voor de propagulen) vertoonde de mangrove geen tekenen van een verminderde vitaliteit aan zijn biogeografische grens, maar zelfs een diversiteit in vegetatiestructuurtypes (hoge bomen, brede bomen, struikformaties en 'sebkha' formaties). Een empirische herbeschouwing van de Point-Centred Quarter Method (PCQM) ingegeven door veldwerkervaring, behandelt de problemen die geassocieerd zijn aan deze methode, zoals dubbelzinnige boomarchitectuur situaties voor het meten van de boomdiameter, aggregatie va","BibLvlCode":"M","StandardTitle":"Mangrove vegetation structure, dynamics and regeneration","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2025-07-02 08:33:14.980000","timezone_type":1,"timezone":"+00:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":null,"MonPub":2001,"DateUpdate":"2012-12-07","DateCreate":"2001-02-14","SecASFANote":null,"ConfID":null,"PeerRev":null,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":null,"monrec":{"MonID":6134,"ISBN":null,"PubliDate":2001,"IssueDate":null,"Volume":null,"Issue":null,"Pagination":"317","Place":"Brussel","Edition":null,"BRefXtra":null,"BRefXtraRR":null,"SerID":null,"SerRR":null,"Ser2BRefID":null,"Ser2RR":null,"StandardTitleSer":null,"ISSN":null,"AbbrevSer":null,"Degree":"PhD","ThesisID":6134,"InsID":172,"Acronym":"bDIV","FullStandardName":"Vrije Universiteit Brussel; Ecology, Evolution and Genetics group","ToPubliDate":null,"SerNotes":null,"eISBN":null,"Pages":317},"serrec":null,"relations":null,"relationsRev":null,"addrec":null,"othpubs":null,"ownerships":null,"authors":[{"AutName":"Dahdouh-Guebas","Firstname":"Farid","Initials":"F.","Affiliation":"Free University Brussels. 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