1,721,060 research outputs found

    Ecologia della germinazione di Phleum sardoum (Hackel) Hackel (Poaceae), microfita psammofila endemica della Sardegna

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    Phleum sardoum (Hackel) Hackel (Poaceae) è una microfita psammofila, endemica della Sardegna (Fig. 1), che si rinviene sugli ambienti dunali, in sole due stazioni [Is Arenas – Arbus (MD) e Rena Majore – Aglientu (OT)] (Camarda, 1980; Pignatti, 1982). La scarsità di informazioni relative alla biologia riproduttiva di questa specie hanno determinato l‘avvio di una serie di ricerche al fine di migliorare le conoscenze relative all‘ ecologia della germinazione. L‘obiettivo del nostro studio è stato valutare gli effetti della rimozione di lemma e palea dai semi, di un periodo di dry after-ripening (90 giorni a 25°C in silica gel), di un range di temperature costanti (5, 10, 15, 20, 25 °C) ed alternate (25/10 °C) e della luce (fotoperiodo di 12/12 e buio, 0/24) sulla germinazione di questa specie. Si è potuto constatare che la rimozione delle glumette dai semi determina una maggiore capacità germinativa finale degli stessi, correlata ad una maggiore velocità di germinazione, come già evidenziato da Kew Gardens (Royal Botanic Gardens Kew, 2008). Il periodo di dry after-ripening ha consentito di aumentare le percentuali di germinazione alle temperature prossime a quella ottimale (10°C), mentre la luce non ha dimostrato di influire significativamente. La germinazione ha mostrato un notevole decremento a temperature superiori ai 15°C. I nostri risultati forniscono nuove informazioni circa l‘ecologia di questa specie, evidenziando una strategia riproduttiva tipica delle piante costiere mediterranee con una germinazione nei mesi più freddi (autunno-inverno) quando la disponibilità idrica è elevata

    Conservazione ex situ e in situ della biodiversità vegetale dell’Area Marina Protetta di Capo Carbonara (Sardegna sud-orientale)

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    The first results of the project “Plant Biodiversity Conservation in the Protected Marine Area of Capo Carbonara (PMA)” are illustrated. This initiative, promoted by the CCB and the Municipality of Villasimius (CA), was funded for three-year period (2005/07) by the Ministry of the Environment and Territory protection. The project provides the study, monitoring and conservation of the coastal habitat, principally on all the Sites of Communitary Importance (pSIC) of the Villasimius Municipality territory, in order to plan a harmonic development between coastal and sea areas unifying the environmental protection secured by the PMA with that relatives to the Natura 2000 network. During the first year there were started ecological, floristic-sociological and chorological studies, in order to value the actual state of conservation and have a possibility to propose adequate measures for a sustainable management. In order to guarantee the effective plant biodiversity conservation, the following ex situ actions have been made: collection, study and conservation for a long time of the seed of selected species in the structures of the Sardinian Seed Bank (BG-SAR), according to international procedures and protocols. At the end of the first year the seed harvest was completed relatively to all the species with a greater risk of extinction. The project provides also actions directed to sensitize the population, local and non, on the thematics of the conservation and the sustainable development of the territory

    The endemic vascular flora of Supramontes: a priority plant conservation area in Sardinia

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    The main aim of this work is to present a checklist of the endemic vascular flora of the Supramontes region (Central Eastern Sardinia) in order to classify this area in the Sardinian biogeographic subprovince and to better assess its conservation priorities. It is one of the most interesting regions of the Island and spreads for 335 km2 from the inland limestone massif to the Orosei gulf. This work was based on bibliographic and herbarium studies, integrated by several field surveys carried out from 2004 to 2009. In this study 138 endemic taxa, belonging to 98 genera and 42 families, have been found, with 92 of which being species, 40 subspecies, 5 varieties and 1 hybrid. The analysis of biologic and chorologic data highlighted the peculiarities of this territory. Due to the relatively high number of Supramontes exclusive endemics and to the geologic and geomorphologic peculiarities, it is here proposed a biogeographic classification for these territories and the identification of an autonomous biogeographic sector divided in two distinct subsectors. According to the recent conservation policies at local level, we propose the definition of micro hotspots for this sector, which hold ca. the 40% of the endemic flora of Sardinia, and the concept of nano hotspots for three narrows areas with an exceptional concentration of endemic species, which represent less than 1% of the whole sector surface and whose in situ protection may allow conserving of more than 80% of the vascular endemic flora of this sector
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