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Loiseleuria procumbens [Ericaceae] in the Spanish Pyrenees

100%

Boratynski A., Romo A.

Acta Societatis Botanicorum Poloniae

2003

tom 72

nr 2

The paper analyses the distribution and occurrence conditions of Loiseleuria procumbens in the Spanish Pyrenees. The species represents a typical arctic-alpine element in the flora of Europe. In the Pyrenees it reaches its southernmost European localities. The Pyrenean populations of the species are not numerous in the majority of the localities. L. procumbens occurs most frequently in the alpine and subalpine zones, at altitudes between 2100 and 2650 m, with a minimum at 1750 m and a maximum at 2900 m. It has been reported nearly exclusively in the siliceous substrata, and predominantly on the north-facing slopes, on the regosols and/or on flat tops of rocks. It forms its own communities, mostly included into the Loiseleurio-Vaccinion alliance, and rarely enters associations of the Festucion airoidis and Rhododendro-Vaccinion alliances. Its typical community, Cetrario-Loiseleurietum procumbentis, is found only in the eastern and central parts of the Spanish Pyrenees.

Geographical differentiation of Dryas octopetala in Europe based on morphological features

80%

Marcysiak K.

Dendrobiology

2014

tom 72

Dryas octopetala is an important arctic alpine species, but its morphological analyses are scarce. The study deals with present European biogeographical structure based on morphology and its relations to the phylogenetic structure and the climate. Characters of leaves from 23 isolated populations were measured, statistically characterized and analyzed with the use of ANOVA and the discriminant analysis. All the features differentiated the tested samples significantly. Differences between plants representing regions were greater than between the samples within regions with regard to the four characters. The most visible division ran between the samples coming from the southern and the northern parts of the range, with the sample from the Western Scandinavia occupying the central position. Correlations between characters and climactic factors were shown, and the size of the leaf was associated mainly with the minimum temperatures of spring months, while the leaf shape with the rainfall during the summer months. Characters differentiating the regions and discriminating populations strongly were mostly dependent on the influence of the climate. The results of the present study were not fully consistent with the outcomes of the biogeographic molecular analyses of the researched species. Some parallels can be drawn when comparing the present analyses with the geographic differentiation of two other arctic-alpine shrubs Salix herbacea and S. reticulata. Although morphological diversity of Dryas octopetala showed a geographic structure, it was most probably shaped mainly by the influence of the environmental and climatic factors.

Ograniczanie wyników

1 Acta Societatis Botanicorum Poloniae

1 Dendrobiology

1 Boratynski A.

1 Marcysiak K.

1 Romo A.

1 2014

1 2003

Wyniki wyszukiwania

Loiseleuria procumbens [Ericaceae] in the Spanish Pyrenees

Geographical differentiation of Dryas octopetala in Europe based on morphological features