Se estudian dos poblaciones de Lathraea squamaria L., especie parásita poco frecuente, en la ribera media-alta del río Esla (Crémenes, León, España), que resultan ser novedad para la provincia de León (España). Se describe la estructura de las poblaciones, se realiza un conteo del número de ejemplares, se hace un seguimiento de su fenología y se detalla su ecología mediante el levantamiento de inventarios fitosociológicos.
The goal of this study was to propose scientific and objective indices capable of measuring the changes that occur in the conservation status of the vegetation of a particular area over a period of time. To this end, phytosociologically-based vegetation cartography at a detailed scale was used, carried out at two different times, and the distance from the climax stage of the territory was calculated for each time. Three temporal indices of landscape change are proposed: Conservation Status Variation Index (ConSVI), Conservation Status Variation Velocity Index (ConSVVe) and Change Ratio (ChanRat). These enable the intensity, velocity, and percentage of change to be measured, and to determine whether this change is progressive or regressive—in other words, whether it is approaching or receding from the climax. To test the proposal, it was applied to a territory in Northwest Spain. The proposed indices are universally applicable to any territory and are the first of their kind to operate at a detailed scale with a phytosociological basis. They also enable an objective measurement to be made of the landscape change that has occurred, meaning that they have immense practical utility in studies of managing and planning territorial resources.
This paper examines High Campoese orophilous snowbed dwarf communities of finely-toothed willow Salix breviserrata Flod. The acidophilous, rupicolous and temporihygrophilous character of this species results in a singular floristic composition that is very different from the Salix breviserrata s.l. Picoeuropean communities. Based on the relevés sampled, the authors describe the endemic High Campoese dwarf scrub association Alchemillo alpinae-Salicetum breviserratae, which we ascribe to the Salicetea herbaceae class, where the mildest ecological conditions are represented, accounting for its relict character. These are Sites of Community Importance as stipulated by the European Commission Habitats Directive, which, together with their sensitivity to global climate change stemming from their limited synchorology, underlines their threatened status and the need for conservation policy.
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