1,721,063 research outputs found
Schede per una Lista Rossa della Flora vascolare e crittogamica Italiana: Genista bocchierii Bacch., Brullo et Feoli Chiappella
No full textSchede per una Lista Rossa della Flora vascolare e crittogamica Italiana: Euphrasia nana (Rouy) Prain
No full textSchede per una lista rossa della flora vascolare e crittogamica italiana: Limonium pseudolaetum Arrigoni & Diana
No full textSchede per una Lista Rossa della Flora vascolare e crittogamica Italiana: Limonium pseudolaetum Arrigoni et Diana
No full textPhenological patterns, seed output and fruit parasitism of Dianthus morisianus Vals., a narrow endemic species of SW Sardinia
No full textPhenological patterns, seed output and fruit parasitim of Dianthus morisianus, a narrow endemic species of Sardinia
No full textReproductive biology of the narrow endemic Anchusa littorea Moris (Boraginaceae), an endangered coastal Mediterranean plant
No full textPhenological and reproductive patterns are fundamental life-history components in the life cycle of plants. In this study, we analyzed phenological and reproductive data at the plant and population levels of the narrow endemic Anchusa littorea Moris, an endangered annual plant species growing in a few small patches at the Is Arenas dune system (SW Sardinia, Italy). Individuals from the main 2 patches were evaluated during a 4-year study period: plants were monitored on a monthly basis in each reproductive phenophase. To assess phenological variability within and among populations, an approach based on the Shannon–Wiener diversity index and the Morisita–Horn similarity index was applied. The seed output and the soil seed bank were also investigated in order to analyze the reproductive capacity of this plant species. Anchusa littorea showed a long flowering season and a high flowering synchrony between patches, which contrasted with a low within-patch synchrony. The seed production per plant was low and the species did not create a soil seed bank. Population size was characterized by considerable annual fluctuations: a significant migration occurred for A. littorea plants inside the dune system over the years. These results demonstrate the importance of the phenological pattern on the knowledge of the reproductive ecology of endangered coastal plant species and will contribute to orient management and conservation efforts
Schede per una lista rossa della flora vascolare e crittogamica italiana: Herniaria latifolia Lapeyr. subsp. litardierei Gamisans
No full textSchede per una Lista Rossa della Flora vascolare e crittogamica Italiana: Herniaria litardierei (Gamisans) Greuter et Burdet
No full textAnalisi dello stato di conservazione di Dianthus morisianus Vals., endemita esclusivo dell’ecosistema dunale di Portixeddu (Sardegna sud-occidentale)
No full textHereby are presented the results of a detailed research carried out on Dianthus
morisianus Vals. (Caryophyllaceae), species included in the priority list of the 10 most
endangered taxa in Sardinia.
This species is particularly threatened by its habitat reduction and fragmentation,
mainly due to anthropic activities and to intrinsic factors related to its reproductive
biology. For these reasons, it is considered to be Critically Endangered according to the
IUCN protocols. Despite the many threats which insist on the population, there still have
not been taken any conservation actions or protection measures.
The aim of this study was to increase knowledge on the biology, ecology, structure
and evolutionary trends of such population, in order to identify appropriate conservation
strategies. The study has therefore provided the integration of in situ analysis concerning the
distribution of the species and its population and the ecological aspects and ex situ analysis
concerning the reproductive biology of such species and its germination ecophysiology.
The data obtained confirm the critical situation of D. morisianus due to anthropic
threats and to its reproductive difficulties. Therefore, it is vital to pursue and implement
studies to identify effective conservation actions for the species
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