1,721,039 research outputs found
A new decision tool to achieve GIS-based conservation strategies for habitats of the European Natura 2000 network
No full textGli effetti dei cambiamenti climatici sulle specie vascolari degli ambienti di alta quota: i casi-studio delle Alpi Retiche e dell'Appennino Settentrionale
No full textManuale per la gestione e il monitoraggio dei Siti della Rete Natura 2000 con particolare riferimento a Flora e Habitat
No full textLo stato di conservazione dell'habitat prioritario 6230* (nardeti ricchi di specie) nel SIC IT2040027 - Valle del Bitto di Gerola (Sondrio) e strategie di gestione
No full textMonitoraggio a scopo conservazionistico di specie vegetali relitte nell'Appennino Tosco-Emiliano
No full textIl clima cambia: e la flora alpina? Un mondo in estinzione? Mutamenti in Alta Val Malenco.
No full textUpward migration of vascular plants following a climate warming trend in the Alps
No full textThe aim of this study was to understand (1) whether warmer climatic conditions affected the vascular plant species composition, (2) the magnitude and rate of altitudinal changes in species distributions, and (3) whether an upward migration of alpine plants is connected to wind dispersal of diaspores. We compared historical records (1954–1958) with results from recent plant surveys (2003–2005) from alpine to nival ecosystems in the Rhaetian Alps, N-Italy. The presence of all vascular plant species and their maximum altitude were recorded along a continuous altitudinal transect of 730 m. An increase in species richness from 153 to 166 species was observed. Moreover, 52 species were
recorded from altitudes 30–430m higher than their 1950s limits, which corresponds to a median migration rate of 23.9 m/decade. In order to explain the observed migrations, the species wind-dispersal ability (diaspore weight and morphology) and the air temperature variation from 1926 to 2003 were considered. Species with more pronounced altitudinal shifts possess lighter diaspores. The highest increase in species richness was found between 2800 and 3100ma.s.l.; this appears to be related to an estimated shift of the permafrost limit by +240m during the last 50 years.
The mean air temperature in the region rose by +1.6 1C in summer and by +1.1 1C in winter within this period.
Climate warming is therefore considered as a primary cause of the observed upward migration of high mountain plants. Calculated altitudinal migration rates, however, varied remarkably among species. This would imply differential abilities of species to persist in an increasingly warmer climate. Species-specific conservation measures, including ex situ conservation, may therefore be required
Nuove segnalazioni di orchidee per l’Appennino pavese (Lombardia, Italia). (New orchid records from Northern Apennines, Lombardy, Italy)
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