{"refrec":{"BRefID":367044,"RR":"Lefebvre, L.; Compère, P.; Gobert, S. (2023). The formation of aegagropiles from the Mediterranean seagrass Posidonia oceanica (L.) Delile (1813): plant tissue sources and colonisation by melanised fungal mycelium. Mar. Biol. (Berl.) 170(2): 19. https://dx.doi.org/10.1007/s00227-022-04166-0","BEntID":364768,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":0,"RefStringPartII":". Mar. Biol. (Berl.) 170(2): 19. https://dx.doi.org/10.1007/s00227-022-04166-0","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Lefebvre, L.; Compère, P.; Gobert, S.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Lefebvre, L.; Compère, P.; Gobert, S.","Englishabstract":"Aegagropiles are conglomerations of fibre debris from Posidonia oceanica meadows that are frequently found along Mediterranean beaches, but the plant organ from which these fibres arise remains unknown. In this study, a histological comparison of P. oceanica organs from 3 shoots with the structure of aegagropile fibres showed that most of them arise from leaf sheaths and rhizomes, suggesting that they are degradation products from the “matte” rather than from the leaf litter, which is mainly composed of detached leaf blades. Moreover, fungal hyphae, micro-sclerotia and typical degradation traces were found in the peripheral tissues of living P. oceanica organs, as well as in degrading aegagropiles. We assume, by comparing Vohník’s observations and the observations made in this study, that these endophytic fungi and degradation traces might be attributed to a dark septate endophyte (DSE) in the Aigialaceae (Pleosporales), Posidoniomyces atricolor, which was recently described as an endosymbiont in P. oceanica roots. It constitutes one of the most important microorganisms by abundance that degrade P. oceanica tissues within the matte and give rise to the different fibre types in aegagropiles. This study shows that the proliferation of fungi causes organ degradation in Posidonia, starting early in living P. oceanica plants, continuing in the matte and, probably, in the leaf litter. The DSE plays a much more important role than that of a simple plant endosymbiont; its omnipresence within P. oceanica (and the degradation of the middle lamella and cell death during proliferation) causing the degradation of various Posidonia organs also contributes to the enrichment of the ‘matte’ compartment of this ecosystem, notably favouring nitrogen retention in its chitinous walls.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"The formation of aegagropiles from the Mediterranean seagrass Posidonia oceanica (L.) Delile (1813): plant tissue sources and colonisation by melanised fungal mycelium","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-17 01:32:52.667327","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Posidonia;Aegagropiles;Marine plant histology;Marine fungus;Microbial degradation;RADIAL OXYGEN LOSS;ARBUSCULAR MYCORRHIZAE;ROOTS;ASSOCIATION;MORPHOLOGY;SPARTINA;GROWTH;CLASSIFICATION;RHIZOSPHERE;ENDOPHYTES","OtherDescriptors":null,"Notes":null,"AnaPub":2023,"MonPub":null,"DateUpdate":"2025-09-18","DateCreate":"2023-09-18","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000953185300002","VABBcode":null,"OpenAcc":0,"DOI":"10.1007/s00227-022-04166-0"},"refs":null,"anarec":{"AnaID":367044,"PubliDate":2023,"Pagination":"19","XtraPublOfAnaID":null,"ISBN":null,"Volume":"170","Issue":"2","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43352,"SerRR":"Marine Biology: International Journal on Life in Oceans and Coastal Waters. Springer: Heidelberg; Berlin. ISSN 0025-3162; e-ISSN 1432-1793","StandardTitleSer":"Marine Biology: International Journal on Life in Oceans and Coastal Waters","ISSN":"0025-3162","AbbrevSer":"Mar. Biol. (Berl.)","StandardTitleMon":null,"StartPage":19,"Pages":null,"ToPubliDate":null,"BRefBibLvlCode":"S","SerNotes":null},"monrec":null,"serrec":null,"relations":null,"relationsRev":null,"addrec":null,"othpubs":null,"ownerships":null,"authors":[{"AutName":"Lefebvre","Firstname":"Laurence","Initials":"L.","Affiliation":"Oceanology, MARE Centre, UR-FOCUS, University of Liege","Discriminator":null,"CorporateFlag":0,"BEntID":364768,"AutID":539439,"OrderNr":1,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":"Université de Liège; Faculté des Sciences; Département de Biologie, Ecologie et Evolution; Laboratoire d'Océanologie Biologique","ORCID":"0000-0002-8368-9768","PersID":40023,"InsID":459},{"AutName":"Compère","Firstname":"Philippe","Initials":"P.","Affiliation":"Laboratory of Functional Morphology and Evolution, Center for Applied Research and Education in Microscopy (CAREM) and Biomaterials Interfaculty Center (CEIB), University of Liège","Discriminator":null,"CorporateFlag":0,"BEntID":364768,"AutID":539440,"OrderNr":2,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":"Université de Liège; Faculté des Sciences; Département de Biologie, Ecologie et Evolution; Laboratoire de Morphologie Fonctionelle et Evolutive","ORCID":null,"PersID":27217,"InsID":3836},{"AutName":"Gobert","Firstname":"Sylvie","Initials":"S.","Affiliation":"Oceanology, MARE Centre, UR-FOCUS, University of Liege","Discriminator":null,"CorporateFlag":0,"BEntID":364768,"AutID":539441,"OrderNr":3,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":"Université de Liège; Faculté des Sciences; Département de Biologie, Ecologie et Evolution; Laboratoire d'Océanologie Biologique","ORCID":"0000-0001-6000-0190","PersID":7089,"InsID":459}],"mapdetails":null,"datasets":null,"monographs":null,"monparts":null,"serparts":null,"BEntOpen":null,"BEntPrivate":null,"availability":[{"BInstID":392405,"LibID":36,"BRefID":367044,"EmbargoDate":null,"FullEmbargoDate":null,"PhysMedID":16,"hasOCRd":null,"ShelfLocCode":"392405","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":"
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