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6 results for “Edraianthus”
Areography, environmental heterogeneity and spatial models explain patterns of past and present diversity in Edraianthus (Campanulaceae)
<p>Our study aims to shed light on distribution patterns and the relationship between species diversity and environmental heterogeneity of 17 <em>Edraianthus</em> taxa. We examined present-day and past distribution (Last Glacial Maximum) by applying ecological niche modelling. The environmental space occupied by the taxa was analysed using niche comparison methods. The results support the idea that the central and southern Dinaric Alps represent a centre of diversity and endemism in the western Balkan Peninsula. <em>Edraianthus</em> diversity is best explained by topographic (slope) and bioclimatic predictors (maximum temperature of warmest month, precipitation seasonality, precipitation of warmest quarter, precipitation of coldest quarter), suggesting that mountain areas with the most diversified relief have higher diversity. Niche modelling results suggest considerable range dynamics during the climatically unstable Quaternary. Thermophitic and lowland taxa responded with longitudinal shifts to ecologically suitable areas farther south, while high mountain taxa responded mainly with elevational shifts. The greatest niche similarity is found among phylogenetically closely related taxa and among ecologically similar and often sympatric taxa. The least similarity was observed in species with marked differences in habitat elevation and in more geographically isolated species. Our results suggest that the extent of range and niche overlap varied among some taxa throughout their evolutionary history, which may have led to diversification at both allopatric and sympatric levels. The correlation between the genetic diversity of the most widespread taxon and the richness of taxa could be a consequence of past and present contacts. On the other hand, alternate periods of isolation may have favoured the emergence of taxa that are reproductively isolated and ecologically specialised.</p>
Data from: Testing the efficiency of nested barriers to dispersal in the Mediterranean high mountain plant Edraianthus graminifolius (Campanulaceae)
Due to strong spatial heterogeneity and limited Pleistocene glaciation, the Balkan Peninsula is a major European biodiversity hotspot. Surprisingly little, however, is known about patterns and processes of intraspecific diversification of its biota in general and of high altitude species in particular. A well-suited system to test hypotheses with respect to various isolating factors acting at different geographic scales and to explore full-range phylogeographic patterns on the Balkan Peninsula is Edraianthus graminifolius (Campanulaceae), distributed in the western Balkan mountain systems, the southwestern Carpathians and the Apennine Peninsula. To this end, we used a dense population sampling and employed Amplified Fragment Length Polymorphism (AFLP) markers and plastid DNA sequences supplemented by ecological niche modelling. The strongest splits were inferred to separate southern and northern Balkan populations from the central ones, from where range extension occurred to the Carpathians and, in more recent times, once or twice to the Apennine Peninsula. The three genetic groups in the western Balkan Peninsula were remarkably congruent among molecular markers suggesting that the barriers to gene flow acted over long time periods facilitating allopatric differentiation. Each main group of Balkan populations contained genetically and geographically distinct subgroups, which likely are the result of local refugia during warmer periods. Evidently, the topographically highly complex and during the last glacial maximum only locally glaciated Balkan Peninsula is a hotspot of species richness and endemism as well as a sanctuary of intraspecific genetic diversity, even if the underlying causes remain insufficiently understood.
FIGURE 3 in Edraianthus canescens (Campanulaceae), a new species from the Central Balkan peninsula
FIGURE 3. Distribution of taxa of the Edraianthus graminifolius complex in C. &. S Balkan Peninsula. Arrow indicates stenoendemic range of E. canescens. Country abbreviations: GR: Greece, AL: Albania, MA: Macedonia, BU: Bulgaria, SR: Serbia, BH: Bosnia and Hercegovina.
FIGURE 2 Edraianthus canescens D in Edraianthus canescens (Campanulaceae), a new species from the Central Balkan peninsula
FIGURE 2 Edraianthus canescens D. Lakušić, Niketić & Stevanović, sp. nov. (from the locus classicus). A. Habitus. B. Inflorescence with involucral bracts. C. Flowers with calyx teeth. D. Rosette leaves. E. Cauline leaves. F. Inflorescence. G.. Capsules with basal lateral pores and axicorns. H. Capsule with axicorn. I. Seed. (photo D. Lakušić).
FIGURE 1. Edraianthus canescens D in Edraianthus canescens (Campanulaceae), a new species from the Central Balkan peninsula
FIGURE 1. Edraianthus canescens D. Lakušić, Niketić & Stevanović, sp. nov. (from the holotype). A. Habitus. B. Rosette leaf. C. Bracts of flowering capitula. D. Calyx. E. Anther. F. Style. G. Corolla. H. Capsule with axicorn (linedrawing V. Stevanović).
Data from: Testing the efficiency of nested barriers to dispersal in the Mediterranean high mountain plant Edraianthus graminifolius (Campanulaceae)
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