Classification of European beech forests: a Gordian Knot ? / Wolfgang WILLNER W. / 2017  

Titre : Classification of European beech forests: a Gordian Knot ? Type de document : texte imprimé Auteurs : Wolfgang WILLNER W., Auteur ; et al., Auteur Année de publication : 2017 Importance : 494-512 Langues : Anglais (eng) Catégories : EUROPE FORET Mots-clés : forêt de Hêtre  Fagetalia sylvaticae  Fagion sylvaticae  Fagus sylvatica  Luzulo-Fagion sylvaticae  Syntaxonomy  TWINSPAN  Vegetation-plot database Résumé : Questions: What are the main floristic patterns in European beech forests? Which classification at the alliance and suballiance level is the most convincing? Saisie BD Flore : Rien à saisir DOI : https://doi.org/10.1111/ En ligne : https://doi.org/10.1111/avsc.12299 Format de la ressource électronique : DOI Permalink : https://portail-documentaire.cbnmc.fr/index.php?lvl=notice_display&id=29110

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Éloge du paradigme synusial : alternative à la classification phytosociologique de la végétation forestière européenne, ouest-asiatique et nord-africaine / Bruno FOUCAULT B. de / 2020  

in 7 - 2020 - 7-Evaxiana-2020 (Bulletin de Evaxiana - Revue électronique de la Société Botanique du Centre-Ouest)     Titre : Éloge du paradigme synusial : alternative à la classification phytosociologique de la végétation forestière européenne, ouest-asiatique et nord-africaine Type de document : texte imprimé Auteurs : Bruno FOUCAULT B. de, Auteur Année de publication : 2020 Importance : 5-248 Langues : Français (fre) Catégories : EUROPE FORET VEGETATION Mots-clés : phytosociologie synusiale, végétation arborescente, végétation herbacée intraforestière, systémique, structures formelles systématiques, synsystème forestier Résumé : Après avoir défendu le paradigme synusial en phytosociologie moderne, l’auteur élabore une partie du synsystème associé en définissant et/ou validant plusieurs unités au sein des classes suivantes : Fraxino excelsioris-Quercetea roboris, Pino halepensis-Quercetea ilicis, Ocoteo foetentis-Perseetea indicae, Rhamno catharticae-Prunetea spinosae, Pistacio lentisci-Rhamnetea alaterni, Erico arboreae-Morelletea fayae, Rubo bollei-Salicetea canariensis, Zizipho loti-Searsietea tripartitae, Nerio oleandri-Tamaricetea africanae, Anemono nemorosae-Caricetea sylvaticae, Melampyro pratensis-Holcetea mollis, Rubio peregrinae-Asplenietea onopteridis. Saisie BD Flore : Rien à saisir Citation bibliographique : FOUCAULT B. de, 2020. - Éloge du paradigme synusial : alternative à la classification phytosociologique de la végétation forestière européenne, ouest-asiatique et nord-africaine. Evaxiana 7 : 5-248. Permalink : https://portail-documentaire.cbnmc.fr/index.php?lvl=notice_display&id=29587

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Genetic variation within the arctic-alpine Calamagrostis stricta (Poaceae) species complex in Europe / Luca CHAMPOUD L. in Plant Systematics and Evolution, 311 (4/12/2024)    

[article]  inPlant Systematics and Evolution > 311 (4/12/2024) . - non paginé Titre : Genetic variation within the arctic-alpine Calamagrostis stricta (Poaceae) species complex in Europe Type de document : texte imprimé Auteurs : Luca CHAMPOUD L., Auteur ; Sandra GRÃœNIG S., Auteur ; Adrian METRY A., Auteur ; Stefan EGGENBERG S., Auteur ; Gregor KOZLOWSKI G., Auteur ; Christian PARISOD Ch., Auteur Année de publication : 2025 Article en page(s) : non paginé Langues : Anglais (eng) Catégories : CALAMAGROSTIS STRICTA CHOROLOGIE EUROPE Résumé : The Calamagrostis stricta (Poaceae) species complex is a circumpolar, boreo-arctic and montane taxon that includes numerous subspecies and varieties. The recent discovery of Calamagrostis lonana in the Alps calls for a thorough assessment of relationships within C. stricta. The main aim of our study was to elucidate the phylogenetic position, genetic structure and ploidy level of C. lonana, as compared to the other members of the C. stricta species complex from Central Europe to the Arctic. Fifteen populations of the C. stricta species complex were sampled across Central and Northern Europe, and their ploidy level was estimated using flow cytometry. Genetic variation was characterized using double digest RAD sequencing reads (ddRAD-seq) on a total of 115 individuals genotyped at 1157 single-nucleotide polymorphisms. Based on flow cytometric measurements, tetraploidy was observed in Arctic populations from Northern Europe and C. lonana in the Alps, in contrast to other populations exhibiting higher ploidy levels. Calamagrostis lonana was genetically closely related to the arctic C. stricta subsp. groenlandica, while C. stricta subsp. stricta formed a second genetic cluster across Central Europe. A third, very distinct genetic cluster was observed in the northern Svalbard archipelago. Despite lacking evidence of sexual reproduction, substantially more genetic diversity than expected under asexual reproduction was detected within populations in C. lonana and other taxa. The distribution and genetic structure of the C. stricta species complex has been shaped by major post-glacial environmental changes having affected cold regions and specifically highlights C. lonana as a valuable relict taxon for the Alps. Citation bibliographique : CHAMPOUD L., GRÜNIG S., METRY A. et al. 2025. - Genetic variation within the arctic-alpine Calamagrostis stricta (Poaceae) species complex in Europe. Plant Syst Evol 311, 1 (2025). https://doi.org/10.1007/s00606-024-01931-0 En ligne : https://doi.org/10.1007/s00606-024-01931-0 Format de la ressource électronique : DOI Permalink : https://portail-documentaire.cbnmc.fr/index.php?lvl=notice_display&id=31629 [article]

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Stellaria ruderalis, a new species in the Stellaria media group from central Europe / LEPSI M. / 2019

in 91 - 2019 - 91-Preslia-2019 (Bulletin de Preslia) Titre : Stellaria ruderalis, a new species in the Stellaria media group from central Europe Type de document : texte imprimé Auteurs : LEPSI M., Auteur ; Petr LEPSI P., Auteur ; Petr KOUTECKY P., Auteur ; Magdalena LUCANOVA M., Auteur ; Eva KOUTECKA E., Auteur ; Zdenek KAPLAN Z., Auteur Année de publication : 2019 Importance : 391-420 Langues : Anglais (eng) Catégories : EUROPE STELLARIA MEDIA STELLARIA RUDERALIS Mots-clés : Caryophyllaceae, flow cytometry, internal transcribed spacer (ITS) sequencing, karyology, multivariate morphometrics, Stellaria media agg., taxonomy Résumé : A new allotetraploid species in the Stellaria media group, S. ruderalis M. Lepší, P. Lepší, Z. Kaplan & P. Koutecký, which is possibly of hybridogenous origin between S. pallida and S. neglecta, is distin-guished and described based on a biosystematic revision of the S. media group. A suite of bio-systematic techniques, including molecular (internal transcribed spacer sequencing), karyological (chromosome counting, flow cytometry), multivariate morphometrics and phenological observations, was used to assess the variation in this species group and determine the taxonomic status of the spe-cies. All the methods employed produced similar results and supported the delimitation of four spe-cies within the Stellaria media group in central Europe: Stellaria ruderalis (2n = 4x = 44), S. pallida (2n = 2x = 22), S. neglecta (2n = 2x = 22) and S. media s. str. (2n = 4x = 40). Stellaria ruderalis is a winter annual growing mainly in disturbed ruderal open or semi-open communities. This species’ broad ecological amplitude allows it to commonly co-occur with its three related species. It is proba-bly a widespread species in southern and central Europe. It is currently spreading in the northern part of central Europe. Photographs of the type specimen and individuals of the new species in situ are pre-sented. Scanning electron micrographs of seeds, microphotographs of seeds and mitotic chromosome spreads and a key for the identification of all four species are provided. Saisie BD Flore : Rien à saisir Citation bibliographique : LEPSI M., LEPSI P., KOUTECKY P., LUCANOVA M., KOUTECKA E. & KAPLAN Z., 2019. - Stellaria ruderalis, a new species in the Stellaria media group from central Europe. Preslia, 91: 391-420. Permalink : https://portail-documentaire.cbnmc.fr/index.php?lvl=notice_display&id=29278

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The Calluna life cycle concept revisited: implications for heathland management / Jenny SCHELLENBERG J. / 2021    

in 31 - 2022 - 31-Biodiversity and Conservation-2022 (Bulletin de Biodiversity and Conservation) Titre : The Calluna life cycle concept revisited: implications for heathland management Type de document : texte imprimé Auteurs : Jenny SCHELLENBERG J., Auteur ; Erwin BERGMEIER E., Auteur Année de publication : 2021 Importance : 119-141 Langues : Français (fre) Catégories : CALLUNA VULGARIS ESPECE PRIORITAIRE EUROPE Mots-clés : Calluna vulgaris, Degeneration, Disturbance, Growth phase, Heathland conservation, Heather vitality, Life cycle, Plant age Résumé : Heather, Calluna vulgaris, is a key species of European dry heath and central determinant of its conservation status. The established Calluna life cycle concept describes four phases—pioneer, building, mature, and degeneration—distinguishable by growth and vitality characteristics of undisturbed plants grown from seeds. However, little is known about the life cycle and ageing of plants subjected to severe disturbance, although measures to this effect (burning, mowing) are common in heathland management. We studied the vitality of over 400 heather plants by examining multiple morphological (plant height, long shoot and inflorescence lengths, flowering activity), anatomical (growth rings) and environmental (management, nitrogen deposition, climate) attributes. We found Calluna vitality to be mainly determined by the aboveground stem age, and that severe disturbances promote vigorous vegetative regeneration. Ageing-related shifts in the habit and vitality of plants resprouting from stem-base buds is similar to that of seed-based plants, but the former revealed higher vitality when young, at the cost of a shorter life span. In contrast, plants originating from decumbent stems resemble building-stage plants but apparently lack the capacity to re-enter a cycle including stages other than degeneration-type. As a consequence, we supplemented the established heather life cycle concept with a post-disturbance regeneration cycle of plants derived from resprouting. We conclude that management of dry lowland heathlands should include rotational small-scale severe disturbance to support both seed germination and seedling establishment as well as vegetative regeneration chiefly of young heather plants capable of resprouting from buds near rootstock. Saisie BD Flore : Rien à saisir Citation bibliographique : SCHELLENBERG J. & BERGMEIER E. 2022. - The Calluna life cycle concept revisited: implications for heathland management. Biodiversity and Conservation 31 : 119-141. En ligne : https://doi.org/10.1007/s10531-021-02325-1 Format de la ressource électronique : DOI Permalink : https://portail-documentaire.cbnmc.fr/index.php?lvl=notice_display&id=30164

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Consultable schellenberg-Bergmeier2022_Article_thecallunaLifecycleconceptRevi.pdf Adobe Acrobat PDF

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