Search results for "Saxifraga"
showing 8 items of 8 documents
New national and regional bryophyte records, 44
2015
Syntrichia norvegica is a circumpolar arctic- montane species (Smith, 2004), rare at lower altitudes and in southern Europe (Frey et al., 2006). It is known from several south-eastern European countries (Sabovljevic et al., 2008) and now it is recorded for the first time in Croatia. Regarding its conservation status, S. norvegica is red listed in Great Britain (EN), Czech Republic (CR), Slovakia (VU), Bulgaria (NT), Hungary (DD), Romania (VU) and Estonia (VU) (Hodgetts, 2014). It was found in the northern Velebit Mountains, in an area with the most outstanding and extreme karst relief, with steep slopes, perpendicular rocks, screes and deep dolines. The locality is situated in the Pinus mug…
Plants assemble species specific bacterial communities from common core taxa in three arcto-alpine climate zones
2017
Evidence for the pivotal role of plant-associated bacteria to plant health and productivity has accumulated rapidly in the last years. However, key questions related to what drives plant bacteriomes remain unanswered, among which is the impact of climate zones on plant-associated microbiota. This is particularly true for wild plants in arcto-alpine biomes. Here, we hypothesized that the bacterial communities associated with pioneer plants in these regions have major roles in plant health support, and this is reflected in the formation of climate and host plant specific endophytic communities. We thus compared the bacteriomes associated with the native perennial plants Oxyria digyna and Saxi…
Strong regionality and dominance of anaerobic bacterial taxa characterize diazotrophic bacterial communities of the arcto-alpine plant species Oxyria…
2017
Arctic and alpine biomes are most often strongly nitrogen-limited, and hence biological nitrogen fixation is a strong driver of these ecosystems. Both biomes are characterized by low temperatures and short growing seasons, but they differ in seasonality of solar radiation and in soil water balance due to underlying permafrost in the Arctic. Arcto-alpine plant species are well-adapted to the low temperatures that prevail in their habitats, and plant growth is mainly limited by the availability of nutrients, in particular nitrogen, due to slow mineralization. Nitrogen fixing bacteria are likely important for plant growth in these habitats, but very little is known of these bacteria or forces …
Causes of the genetic architecture of south-west European high mountain disjuncts
2008
Background: Postglacial climatic warming in south-western Europe and the retreat of cold-adapted species into higher elevations, starting in the Sierra Nevada and proceeding northwards to the Pyrenees and Alps, should have resulted in a pattern of ‘successive vicariance’. Alternatively, long-distance dispersal might explain the extant distribution pattern of mountain species in this region. Aims: Here, we report an investigation of two alpine plants, Saxifraga oppositifolia and S. stellaris, which co-occur in the Sierra Nevada, the Pyrenees, and the south-western Alps/Massif Central. Our aim was to distinguish between (successive) vicariance and long-distance dispersal as alternative explan…
Hydrocarbon chemotypes of some blackcurrant cultivars (Ribes sp)
1989
The hydrocarbon fractions of the essential oils of 11 cultivars of blackcurrant (Ribes spp) buds originating from collections in France and Australia have been submitted to GC/MS analysis. The major monoterpene and sesquiterpene hydrocarbons define chemotypes which have been conventionally described by a letter-based formula. Whereas four monoterpene chemotypes previously reported are confirmed, eight sesquiterpene chemotypes have to be redefined. They involve: δ-elemene, β-caryophyllene, γ-elemene, α-humuiene, alloaromadrene, germacrene D, γ-cadinene, and two unknowns. The different cultivars examined and their corresponding chemotypic formulae have been discriminated by principal componen…
Evolution in the Arctic: a phylogeographic analysis of the circumarctic plant,Saxifraga oppositifolia(Purple saxifrage)
2003
Summary • A survey of chloroplast DNA variation in the circumarctic-alpine plant, Saxifraga oppositifolia, has resolved two highly divergent cpDNA lineages with geographically widespread and mainly allopatric distributions that are largely concordant with those of two subspecies, that is, subspp. oppositifolia and glandulisepala. These subspecies differ for a single morphological trait and hence level of morphological divergence does not equate to molecular divergence within the species. • The two cpDNA lineages were estimated to have diverged from their most recent common ancestor 5.37–3.76 Ma, that is, during the early to mid-Pliocene. • A nested clade analysis was conducted in an attempt…
Chemosystematic study on leaf volatile compounds of Saxifraga L. series Ceratophyllae (Saxifragaceae)
1999
Extracts from 65 samples corresponding to 13 species and 18 taxa of Saxifraga series Ceratophyllae s. l. were analysed by GC and GC/MS. This paper provides the first chemosystematic information on volatile composition of a seemingly natural group in the Saxifragaceae. Diterpenoids and n-alkanes appear to be the most important constituents and some of them are associated to different species and taxonomic series. The application of multivariate analysis techniques to GC and GC/MS data has allowed the classification of samples into two groups, corresponding approximately to the series Ceratophyllae s. str. and Pentadactyles, previously proposed on the basis of morphological and cytotaxonomica…
Catalogue of the Diptera (Insecta) of Morocco— an annotated checklist, with distributions and a bibliography
2022
The faunistic knowledge of the Diptera of Morocco recorded from 1787 to 2021 is summarized and updated in this first catalogue of Moroccan Diptera species. A total of 3057 species, classified into 948 genera and 93 families (21 Nematocera and 72 Brachycera), are listed. Taxa (superfamily, family, genus and species) have been updated according to current interpretations, based on reviews in the literature, the expertise of authors and contributors, and recently conducted fieldwork. Data to compile this catalogue were primarily gathered from the literature. In total, 1225 references were consulted and some information was also obtained from online databases. Each family was reviewed and the c…