Percorrer por autor "Poponessi, Silvia"
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- Dataset on bryophyte species distribution across an elevational gradient on Flores IslandPublication . Gabriel, Rosalina; Nunes Morgado, Leila; Poponessi, Silvia; Henriques, Debora; Coelho, Márcia; Silveira, Gabriela; Pereira, Fernando; Borges, P.A.V.; Guerrero-Ramírez, NathalyABSTRACT: A bryophyte diversity survey was carried out from July 29 to 1 August 2013, in Santa Cruz das Flores, Flores Island (Azores) (39.471185 N Latitude; -31.184692 W Longitude), along an elevational gradient (70, 200, 400, 600 and 800 m a.s.l.). The study employed the Global Island Monitoring Scheme (GIMS) protocol for bryophytes. At each elevation level, three replicates of six substrates colonised by bryophytes (rock, soil, humus, dead wood, tree trunks, leaves) were collected. In total, 385 sampling events generated 1345 species occurrence records, representing 89 bryophyte species (37 mosses; 52 liverworts).
- Diversity and Distribution of Bryophytes Along an Altitudinal Gradient on Flores Island (Azores, Portugal)Publication . Gabriel, Rosalina; Nunes Morgado, Leila; Poponessi, Silvia; Henriques, Debora; Coelho, Márcia; Silveira, Gabriela; Borges, P.A.V.; Zechmeister, HaraldABSTRACT: Altitudinal gradients offer powerful natural frameworks to investigate how environmental factors shape biodiversity, especially on young oceanic volcanic islands where short spatial distances encompass sharp climatic transitions. This study documents bryophyte diversity and examines how elevation, substrate, and environmental variables influence the structure of bryophyte communities on Flores Island (Azores). Across five sites and 385 microplots, 89 species from 37 families were recorded, with liverworts predominating (liverwort-to-moss ratio of 1.41). Species richness and abundance followed a unimodal pattern, peaking at mid-elevations (400–600 m a.s.l.), where humid and thermally stable conditions favor the coexistence of lowland and montane taxa. Even modest altitudinal shifts corresponded to pronounced turnover in community composition, revealing strong ecological filtering along the gradient. Substrate type further influenced diversity patterns, with liverworts dominating epiphytic and lignicolous habitats, while mosses were more diverse on terricolous and rupicolous substrates. The presence of several Azorean and Macaronesian endemics, including threatened taxa, highlights the conservation importance of mid-elevation habitats. Overall, these results show that fine-scale altitudinal variation generates substantial ecological differentiation, underscoring the role of montane forests as refugia for hygrophilous and endemic bryophytes and as sensitive indicators of environmental change in island ecosystems.