{"refrec":{"BRefID":208718,"RR":"<b>Verbruggen, H.; De Clerck, O.; Coppejans, E.</b> (2005). Deviant segments hamper a morphometric approach towards <i>Halimeda</i> taxonomy. <i>Cryptogam., Algol. 26(3)</i>: 259-274","BEntID":200706,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Cryptogam., Algol. 26(3)</i>: 259-274","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Verbruggen, H.; De Clerck, O.; Coppejans, E.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Verbruggen, H. <i>et al.</i>","Englishabstract":"Traditional taxonomy of the segmented green algal genus <i>Halimeda</i> is largely based on descriptive expressions of thallus habit, segment shape and anatomical structures. In the course of the last decade, molecular phylogenetic studies have revealed non-monophyly and cryptic diversity in several species. In an attempt to tackle the taxonomic problems that were raised by these molecular studies, a combined molecular and morphometric method was developed. In this study, a morphometric pilot data set is explored. This resulted in the discovery of segments aberrant in morphology and/or anatomy. These are primarily apical and non-calcified segments, and segments from the basal part of the algal body. To answer the question whether incorporation of comparison of discriminant analyses that included and excluded deviant segments demonstrated the negative influence of such segments on the taxonomic power of the data. Omitting non-calcified and apical segments and segments from the basal thallus region yielded the same results as the exclusion of all deviant segments, irrespective of their location in the algal body. This result permits a simple recommendation towards precluding these types of segments from further studies. ","AbstractOtherLang":"La taxonomie traditionnelle du genre <i>Halimeda</i>, une algue verte à segments, est largement basée sur la morphologie générale du thalle, la forme des segments et des caractères anatomiques. Au cours de la dernière décennie, des études moléculaires phylogénétiques ont démontré la non-monophylie et la diversité cryptique de plusieurs espèces appartenant à ce genre. Dans un essai d’élucidation des problèmes taxonomiques qui ont été soulevées par ces études moléculaires, une méthode combinée moléculaire et morphométrique a été développée. Dans cette étude une banque de données morphométriques pilote est explorée. Ceci a résulté en la découverte de segments morphologiquement et anatomiquement aberrants. Ces segments proviennent surtout des parties apicales non calcifies et des segments de la base du thalle. Malgré cette connaissance, il reste la question si l’incorporation de ces segments aberrants dans la banque de données a un effet négatif sur sa valeur taxonomique. La réponse a été donnée par l’utilisation d’une approche à analyse discriminante, dans laquelle les groupes avaient été déterminés sur la base de methods moléculaires et donc indépendants de la morphologie. Le fait que l’assignement de segments à des groupes d’espèces est meilleur lorsque les segments déviants sont omis prouve bien l’effet négatif de l’inclusion de ces dernières. L’omission des segments non calcifiés, des segments apicaux et des parties basales du thalle donne les mêmes résultats que l’omission de tous les segments déviants, de n’importe quelle partie du thalle. Ce résultat permet de conclure à la simple recommandation d’exclure ce type de segments aberrants d’études morphométriques futures.","BibLvlCode":"AS","StandardTitle":"Deviant segments hamper a morphometric approach towards <i>Halimeda</i> taxonomy","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Anatomy; Bryopsidales; Chlorophyta; deviant segments; discriminant analysis; Halimeda; morphology; morphometrics; taxonomy","OtherDescriptors":null,"Notes":null,"AnaPub":2005,"MonPub":null,"DateUpdate":"2012-02-21","DateCreate":"2011-10-20","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000232020300003","VABBcode":null,"OpenAcc":0},"refs":null,"anarec":{"AnaID":208718,"PubliDate":2005,"Pagination":"259-274","XtraPublOfAnaID":null,"ISBN":null,"Volume":"26","Issue":"3","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42596,"SerRR":"Cryptogamie. Algologie. ADAC: Paris.  ISSN 0181-1568; e-ISSN 1776-0984","StandardTitleSer":"Cryptogamie. 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