1,721,188 research outputs found
Atti del convegno "Cambiamento climatico: analisi ed impatti su specie ed ecosistemi vegetali". Gruppo di Ecologia della Società Botanica Italiana
No full textIl volume comprende gli atti del convegno "Cambiamento climatico: analisi ed impatti su specie ed ecosistemi vegetali", organizzato il 18 Aprile 2012 presso l'Università dell'Insubria (Varese) dal Gruppo di Ecologia della Società Botanica Italiana. Nel volume sono riportati i riassunti di tutte le presentazioni, sia orali che poster, e dei riassunti estesi. I lavori si riferiscono ai più recenti risultati della ricerca scientifica italiana sugli impatti del cambiamento climatico su specie ed ecosistemi vegetali
Natural and human impact in Mediterranean landscapes: An intriguing puzzle or only a question of time?
Full text linkTime is a key factor to understand the effects of disturbance on natural communities or ecosystems. In Mediterranean landscapes, where nature and humans have been strongly intermingling since mid-Holocene, the relationships between plant ecology and palaeoecology and their role for the interpretation of natural and anthropogenic changes still needs to be clearly understood. Ecology and palaeoecology are both investigating such problems, but each of them cannot disentangle the specific role played by nature and by humans in shaping the present plant communities and landscapes. A new age of cooperation among researchers in ecology and palaeoecology is needed, and the integration of these closely related but separated research fields is necessary to explain the resulting dynamic puzzle. Plant ecologists should avoid the oversimplification of the actual causes as the exclusive drivers of plant communities and landscapes and force the exploitation of the available data to generate and test new hypotheses for past, present and future environmental reconstructions and management. Even when planning for the future biodiversity conservation, we need to properly use the existing information about millennia of human effects on the natural biotas, to properly set landscape management and conservation priorities
Hyerarchical analysis of species-environmental relationships: plant communities of remnant biancane field
No full textIron-deficiency anemia in premenopausal women: why not consider atrophic body gastritis and Helicobacter pylori role?
No full textDetection of the effects of restoration on community composition in a calcareous grassland: Does scale matter?
No full textThe importance of the scale of observation in vegetation science has long been recognized. We have evaluated the effect of grain (plot dimension) on the detection of changes induced by shrubs cutting on plant composition of a calcareous grassland in Southern Tuscany (Italy). We conducted a 2-year before 2-year after-control-impact (BACI) field sampling design. We collected the cover of vascular plants using nested square quadrats with 0.5, 1 and 2 m sides. Any deviation of the restored plots from the control was analyzed by using the principal response curve (PRC) technique. Differences between the control and the restored plots, in time, accounted for 4.5, 3.3 and 7.4 of the between-plot variation
in species composition, respectively for 0.25, 1 and 4 m2 plots, but only the first PRC component of the largest scale was statistically significant. The results showed that the ability to differentiate the control from the restored plots, changed with increasing grain size although we did not obtain a monotonic behavior of the variance explained by the multivariate model. Including the assessment of scale dependence in the monitoring project appears useful and necessary to correctly evaluate the effects of restoration actions in a consistent way
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