|Schulz, F; Dengler, J: Verbreitungsatlas der Moose in Schleswig-Holstein und Hamburg., Landesamt für Natur und Umwelt des Landes Schleswig-Holtein, Flintbek. (2006)|
|Key words: Anthocerotophyta, Bryophyta, chorology, conservation, floristic mapping, Germany, Marchantiophyta, phytosociology, red data book|
Distribution atlas of the bryophytes in Schleswig-Holstein and Hamburg The book is the result of 20 years of floristic mapping of the bryophytes in the federal states of Schleswig-Holstein and Hamburg (NW Germany). It also includes an evaluation of literature data and herbarium specimens. In both federal states combined, we recognise 598 taxa (species, subspecies or varieties), including 2 hornworts (Anthocerotophyta), 126 liverworts (Marchantiophyta), and 470 mosses (Bryophyta). Literature records of a further 44 taxa from the region are erroneous. The distribution of all occurring bryophyte taxa is presented by means of grid maps with quadrants (ca. 5 km x 5 km) of topographic map sheets as grid cells. We distinguish four time periods (before 1900, 1900–1949, 1950–1984, 1985–2006). Furthermore, all taxa are provided with uniform species accounts, using the categories ‘Syn.’ (synonyms and other names of similar meaning, particularly those used in older regional floras), ‘Verbrei- tung’ (global distribution, regional distribution and frequency, for extremely rare taxa also concrete records of the findings), ‘Standort’ (biotopes, ecological ‘behaviour’, associated taxa, preferences for syntaxa and synusiae), ‘Gefährdung’ (population trends, reasons of threat, red data book categories for both fe- deral states, data of the last record for extinct taxa), and ‘Anmerkungen’ (comments, e.g., discussion of different taxonomic treatments, tips for identification, frequency of sporo- phytes in the region). In the General Part of the book, we begin by characterising the physical geography of the region (climate, soil, potential natural vegeta- tion) and describing the most important habi- tat types for bryophytes and the specific bryophyte flora of each type. We then discuss reasons for the decline of bryophyte diversity as well as legal and practical conservation measures. The categorisation in the recent red data books of Schleswig-Holstein (2002) and Hamburg (1996) proved to be inadequate in several cases, partly due to new discoveries after their publication. In such cases, we pro- posed changes of the categories in the species accounts. In the General Part, these proposals are summarised. Accordingly, 67 % of the taxa are listed in the red data book of Schleswig-Holstein and 17 % are already extinct there. The corresponding values in Hamburg are 71 % and 34 %. We continue the General Part with a chapter on bryophytes in plant communities and synusiae and an- other on the distribution of bryophytes. In the final chapters, we present the history of bryo- logy in the region, the methodology of the project, the systematics and nomenclature used in the book, the overall results of the project, and the structure of the species accounts. The third and final part of the book comprises different indices and lists, including a list of all taxa with their red data book categories in both federal states and suggested changes, the syntaxonomic overviews of plant commu- nities and synusiae on which the sociological information in the species accounts is based, a glossary, and a list of important synonyms.