1,721,032 research outputs found
Conservazione ex situ e in situ della biodiversità vegetale dell’Area Marina Protetta di Capo Carbonara (Sardegna sud-orientale)
No full textThe 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 checklist of the Sardinian alien flora: an update
No full textAlien plants colonization, due to the fast spreading of highly invasive taxa, is more and more a serious source of concerns for habitat and species conservation. Apart direct in situ intervention, it is of major importance to acquire the best and up to date knowledge about alien taxa that currently threaten the integrity of wild and valuable environments. In this light, here is presented the update to the checklist of alien vascular flora of the island of Sardinia (Italy) on the basis of the new findings, nomenclatural adjustments, and revision of diffusion status of alien taxa. The checklist at present, consists of 541 taxa (84 doubtful) which represent 17% of the whole flora of the island; 22 taxa are new to the island and 7 of them for Italy. Neophytes represent the majority of the whole alien flora (301, 66% of the total) and, in confront to archaeophytes, gather nearly all invasive taxa (54 vs 4). The new findings are all neophytes. Phanerophytes (42%) are the most representative biological form and Americas represents the region that mostly contributes to the Sardinian alien flora (33%). Further analysis highlights that, in terms of number of taxa, highly anthropically impacted environments such as synanthropic (36%) and agricultural (23%) are the eligible habitats for most of the alien species in Sardinia while coastal areas and wetlands, beyond hosting a lower number of taxa, are characterized by the relative highest number of invasives
Catálogo de la flora exótica de Cerdeña (Italia)
No full textThis paper provides a checklist of exotic flora on the island of Sardinia
(Italy) with a total of 482 taxa which represent 18% of the flora of the island; 29
taxa are new to the island and 9 of them for Italy. Most of these taxa (289, which represent
62% of the total) are neophytes and 173 (38%) are archeophytes, while new
events are all related to neophytes. Among all neophytes, 44% are naturalized, 39%
casual and 17% invasive. The archeophytes include a 55% of naturalized taxa, 44%
casual and 1% invasive. The category of invasive accounts 11% of the total alien flora.
The analysis of the checklist confirms phanerophytes as the most represented biological
form (40%), with the American origin prevalent among all species (30%). Further
analysis have been conducted in order to verify the impact on different ecosystems and
the most vulnerable habitats to the phenomena of neocolonization are agricultural
(32%) and sinanthropic (28%), followed by wetlands (11%) and coastal (10%)
Seed germination, salt stress tolerance and seedling growth of Opuntia ficus-indica (Cactaceae), invasive species in the Mediterranean Basin
No full textThe present study, focuses on seed germination ecology and seedling growth of Opuntia ficus-indica (Cactaceae), a native species of arid and semi-arid regions of Mexico and invasive in the Mediterranean Basin. Shortly after collecting seeds in December 2014, scarification as well as the intra-specific variability in the responses of germination to light, temperature, salt stress and germination recovery were evaluated among three naturalized populations of this species in the Mediterranean. Moreover, seedling biomass production and the growth rate were measured. The most suitable method of scarification resulted the nail-clippers chipping. For all the populations, the germination trend was similar under light and darkness, but higher values of germination occurred under light. The highest germination occurred, for all the tested populations, at temperatures of 20 and 25 °C. Opuntia ficus-indica seeds were able to germinate up to 500 mM NaCl, but inter-population differences were observed. Nevertheless, seeds from all provenances showed a low ability to recover their germination after NaCl exposure. Biomass production of seedlings was similar for Sardinian and Sicilian populations, but not compared with the Spanish population. The growth rate of the Spanish population was, like the seedling biomass, different from those of Sardinia and Sicily. This study confirmed the presence of physical dormancy in O. ficus-indica seeds, due to lignified teguments in the seed testa and a secondary dormancy induced by the exposition to salinity. Even if many naturalized populations occur in the Mediterranean ecosystems, it seems this species has not acquired the Mediterranean germination syndrome. The ability of the seeds to germinate at high NaCl concentrations reveals a potential growth of O. ficus-indica in close coastline areas and in soils with high salt concentrations. These results could be important to predict where this species will spread in the Mediterranean Basin, threatening the biodiversity of coastal ecosystems, especially in islands
Comparison of the invasive alien flora in continental islands: Sardinia (Italy) and Balearic Islands (Spain)
No full textThis article provides a comparison of the invasive vascular flora of Sardinia
and that of the Balearic Islands. The study has recorded 53 invasive taxa in Sardinia (12%
of the alien flora) while 48 (14%) in the Balearic Islands, 19 of them common for both
territories. The invasive flora of Sardinia is included in 18 families; Asteraceae is the
richest in taxa, followed by Amaranthaceae, while in the Balearic Islands in 19 families,
with a predominance of Poaceae and Asteraceae. The comparison of the biological
spectrum reveals that in Sardinia therophytes and phanerophytes are the most represented,
as well as therophytes and hemicryptophytes are in the Balearic Islands. Neophytes are
clearly dominant comparing to archaeophytes. A study of the geographical origin shows
supremacy of the American element. The majority of invasive taxa is a result of intentional
human introductions, mainly for ornamental use. The most occupied habitats in both
territories are the semi-natural, agricultural and synanthropic for both territories, followed by natural habitats as coastal ones in Sardinia and wetlands in the Balearic Islands. An
important part of the work deals with the environmental, economic and human-health
impact
Invasive Alien Flora on Coastal Mediterranean Habitats
No full textThe Mediterranean Basin is one of the biodiversity mega-hotspots of biodiversity, but it is also considered as one of the most disturbed areas, due to a legendary human occupation, mostly concentrated in coastal areas. These factors, together with a mild climate, explain the high impact of invasive alien plants in the Mediterranean coastline. The habitats subjected to saline influence are especially interesting and have been widely studied as species living there have developed, along evolution, special adaptations that make them unique and very valuable. This study aims to present how alien plant species behave when becoming invasive in coastal habitats of the Mediterranean Basin. Some alien invasive species outstand for their specificity regarding the habitat and pose a major challenge for environmental managers. Coming to understand their behavior can help to mitigate their impact and prepare for future invasions. The document focuses on making a comprehensive characterization, with special emphasis on germination behavior of this flora, that has become one of the most important threats for biodiversity in the Mediterranean context
Territory defence throughout conservation of the plant diversity: the project of the Protected Sea Area of Capo Carbonara (South eastern Sardinia)
No full textContents, activities in progress and results achieved of a project on the conservation of the plant diversity of the Protected Sea Area of Capo Carbonara, funded in 2005 by the Ministry of Environment and Territory Protection are illustrated
Weed risk assessment of Acacia saligna in Sardinian coastland habitats through ex situ germination study and in situ monitoring.
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