Figure 5 - uploaded by Des Callaghan
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Examples of Sphagnum capillifolium s.l. hummocks occupied by Biantheridion undulifolium, including an untrampled but grazed hummock at Carneddau (A) and a heavily trampled and grazed hummock at Nover's Hill (B). Photographed by D. A. Callaghan.
Source publication
Introduction
Biantheridion undulifolium (Nees) Konstant. & Vilnet [Jamesoniella undulifolia (Nees) Müll.Frib.] is a globally rare liverwort threatened with extinction. This study was carried out to investigate its population status and ecology in England and Wales, UK.
Methods
Surveys were undertaken at all previously known sites where the species...
Context in source publication
Context 1
... on which B. undulifolium occurs are usually moderately to heavily compacted by grazing animals, although the component Sphagnum is generally in good health, normally with few or no signs of necrosis. The species also sometimes occupies hummocks uncompacted by livestock trampling, but only hummocks that that are densely formed and grazed ( Figure 5). Sphagnum hummocks of loose growth form, typical of flushes and mires that are ungrazed, are not occupied. ...
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Citations
... Il s'agit d'une espèce dioïque dont les sporophytes sont exceptionnels (Hugonnot et al. 2002 ;Hugonnot 2012). Par comparaison avec d'autres populations où des évaluations démographiques ont été réalisées (Callaghan 2022), on peut considérer les effectifs comme relativement faibles. ...
RESUME : Le massif du Tanargue correspond à une petite région écologique, couvrant environ 80 km², située aux confins des plateaux ardéchois, sur la bordure méridionale du Massif central. Depuis près de 20 ans ce site a été parcouru dans l'optique d'en inventorier la richesse bryophytique. La liste complète des 395 taxons observés après 2000 complétée de la seule espèce observée par Dismier (1928) n'ayant pu être retrouvée, Harpanthus scutatus, est fournie. L'accent est mis sur les 29 espèces remarquables dont certaines sont en situation isolée, sur la bordure sud-est du Massif central et constituent les seules populations actuellement connues de ce territoire. Plus d'une centaine de taxons sont considérés comme menacés à l'échelle de la région Rhône-Alpes. Le Tanargue est un site important pour la conservation des bryophytes forestières, des habitats rocheux et des tourbières. ABSTRACT: The Tanargue massif corresponds to a small ecological region, covering approximately 80 km², located on the borders of the Ardèche plateaux, on the southern edge of the Massif Central. For nearly 20 years, this site has been explored with a view to inventorying its bryophyte richness. The complete list of the 396 taxa observed after 2000 supplemented by the only species observed by Dismier (1928) which could not be found, Harpanthus scutatus, is provided. Emphasis is placed on the 29 remarkable species, some of which are in an isolated situation, on the southeastern edge of the Massif Central and constitute the only populations currently known in this territory. More than a hundred taxa are considered threatened across the Rhône-Alpes region. The Tanargue is an important site for the conservation of forest bryophytes, rocky habitats and peat bogs.
Introduction
Britain supports one of the richest bryophyte floras in Europe. Following previous assessments in 2001 and 2011, the aim of this study was to provide a new IUCN Red List of the bryophytes of Britain.
Methods
Following IUCN guidance, all species known to have occurred in Britain since ad 1500 (n = 1097) were assessed based on a comprehensive review and synthesis of available information. Various new measures are provided here for all species, such as the number of subpopulations, area of occupancy, and extent of occurrence, in addition to national population estimates for 181 species. Results are compared with the previous Red List assessment of 2011.
Key results and conclusions
Species were categorised as Regionally Extinct (RE, n = 4), Not Applicable (NA, n = 23), Data Deficient (DD, n = 45), Critically Endangered (CR, n = 59), Endangered (EN, n = 52), Vulnerable (VU, n = 80), Near Threatened (n = 39) or Least Concern (n = 795). Excluding those in DD, NA or RE, 19% (n = 191) of bryophyte species in Britain are threatened with extinction (i.e. are in CR, EN or VU). Of the 59 species in the highest extinction risk category (CR), it is possible that 20 (34%) are already extinct. Of the 143 species included in the previous assessment in a threatened category (CR, EN or VU), 85 (69%) have been transferred to a new category, mainly because of new information on the status of the species.
Die Literaturzusammenstellung erhebt keinen Anspruch auf Vollständigkeit. Sie berücksichtigt überwiegend Publikationen aus dem Jahr 2022, sowie Nachträge aus dem Jahr 2021 und beinhaltet hauptsächlich Fachbücher und Fachartikel zu Studien und Fundberichten über Moose in Mitteleuropa. Zusätzlich sind außereuropäische Arbeiten aufgelistet, die aufgrund der behandelten Arten oder Methoden von Interesse sind. Für aktuelle Veröffentlichungen mit Fokus auf Taxonomie und Systematik sei auf den Beitrag „Taxonomische und nomenklatorische Neuerungen – Moose, von Markus K. Meier in diesem Herzogiella-Heft verwiesen. Für Hinweise auf entsprechende Publikationen für kommende Folge dieser Serie sind wir dankbar.
