Search results for "sistematica"

The check-list of fungi in Sicily (southern Italy): current survey status

2011

A number of checklists are currently available in several continents, European and extra European countries (Holland, Switzerland, France, United Kingdom, North America, Argentina, Brazil, Uruguay, Venezuela, Bulgaria, Greece, Italy, Norway, Poland, Portugal, Spain, Romania, Russia, Africa, Iran, Oman, Turkey, Asia). The checklists are modern tools for evaluation of fungal biodiversity and precious documents to obtain ecological data and information for management and exploitation of protected areas, agro- and forest ecosystems. A checklist of Sicilian fungi was edited by Venturella (1991), followed, in 2009, by a new report (Gargano et al., 2009). At that time the number of macrofungi from…

Fatty acid composition of the seed lipids ofChamaerops humilisL. natural populations and its relation with the environment

2014

Seed lipids composition is a tool to discriminate among plant taxa and is related to phylogeny and biogeographic distribution. Aim of the present study was to evaluate the fatty acid (FA) composition of the seed lipids from nine natural Chamaerops humilis L. population and its relation with the climatic traits of the collection sites. The average seed lipids content was 54.8 g kg21 and the most represented FAs were oleic (478 g kg21 oil) and linoleic (230 g kg21 oil), with significant differences among the accessions. Most of the lipid traits significantly correlated with climatic traits. In particular, oleic acid negatively correlated with year potential evapotranspiration. These relations…

Reports (1815-1816), in: Kamari G, Blanché C, Silijak-Yakovlev S (eds.) Mediterranean chromosome number reports - 23.

2013

Responses of macroalgal community to environmental changes

2009

Species of Cystoseira (Ochrophyta, Fucales) seem to be sensitive to a variety of environmental changes, as a consequence of which, they are now used in ecological status assessment. On the contrary, invasive species tend to be more resilient to disturbances than Cystoseira species, and thus environmental changes to allow them to out-compete these species. All these evidences lead to consider Cystoseira species, as well as invasive species, as biological indicators of environmental changes. Therefore, the effects of environmental changes can be measured through: (1) the assessment of the current state of the popu- lations of Cystoseira species and of invasive species, (2) the comparison of i…

Convergent Morphological Evolution in Silene Sect. Italicae (Caryophyllaceae) in the Mediterranean Basin

2022

Recent divergence can obscure species boundaries among closely related taxa. Silene section Italicae (Caryophyllaceae) has been taxonomically controversial, with about 30 species described. We investigate species delimitation within this section using 500 specimens sequenced for one nuclear and two plastid markers. Despite the use of a small number of genes, the large number of sequenced samples allowed confident delimitation of 50% of the species. The delimitation of other species (e.g., Silene nemoralis, S. nodulosa and S. andryalifolia) was more challenging. We confirmed that seven of the ten chasmophyte species in the section are not related to each other but are, instead, genetically c…

Risposte agli stress ambientali in CYSTOSEIRA (C. AGARDH): effetti della temperatura sul contenuto dei composti fenolici

2012

Phenolic compounds are secondary metabolites involved in different protection mechanisms as, for example, against grazers, epiphytes and UV radiation. Seasonal variations of phenolic content in C. amentacea were analysed and laboratory experiments, in which C. amentacea was exposed to an increase of temperature (258C and 308C), were performed. Total phenolic content (TPC) was determined colorimetrically with the Folin–Ciocalteu reagent. In C. amentacea, a seasonal pattern in TPC was observed, with a maximum value in winter-spring. C. amentacea responded significantly to the temperature treatments with a consistent decrease in TPC after 48 h.

The RIBES strategy for ex situ conservation: conventional and modern techniques for seed conservation

2022

The Italian seed bank network (RIBES) aims to improve the quality and safety of the germplasm reserves of native plant species in Italy to ensure the long-term conservation of endangered and/or endemic flora. The strategy includes traditional methods to secure seed conservation. A comprehensive priority list for seed collection is being defined, it was prepared by crossing data of various checklists (red lists, endemics) and will soon be cross-referenced with an updated list of accessions of the whole network. A safety-backup program of duplicates will quickly be implemented to secure the conservation of the most threatened species in at least two seed banks of the network. On the other han…

Contributions for a vascular flora of Tuscany. XIV (874-958)

2022

New localities and/or confirmations concerning 85 specific and subspecific plant taxa of Tuscan vascular flora, belonging to 68 genera and 36 families are presented: Amaranthus (Amaranthaceae); Allium (Amaryllidaceae); Bifora, Bupleurum (Apiaceae); Arisarum (Araceae); Maianthemum, Ruscus (Asparagaceae); Bidens, Crepis, Galinsoga, Senecio, Taraxacum, Tolpis (Asteraceae); Anchusa, Cerinthe (Boraginaceae); Cakile, Cardamine (Brassicaceae); Butomus (Butomaceae); Campanula (Campanulaceae); Polycarpon, Silene, Stellaria (Caryophyllaceae); Convolvulus (Convolvulaceae); Phedimus (Crassulaceae); Carex, Cyperus, Schoenus (Cyperaceae); Chrozophora, Euphorbia (Euphorbiaceae); Lotus, Medicago, Ononis, T…

Notas taxonómicas y distributivas sobre Serapias lingua subsp. tunetana (Orchidaceae), una rara espècie endémica de Túnez

2019

Serapias lingua subsp. tunetana, a rare endemic orchid confined to Tunis, northern of Tunisia, has been rediscovered far away from its type locality nearly after 22 years. Since its first finding in 1996 and its description published in 2005, the subspecies has not been found again, and was presumed to be extinct, or the taxon was erroneously identified. A detailed description of the subspecies justifying an amendment to its description, a map of its current distribution and colour photographs are also provided. The affinities to the related taxa within the S. lingua group occurring in Tunisia are here presented. The global IUCN status for this taxon is evaluated. Serapias lingua subsp. tun…

Species–area relationships in continuous vegetation: Evidence from Palaearctic grasslands

2019

Aim Species-area relationships (SARs) are fundamental scaling laws in ecology although their shape is still disputed. At larger areas, power laws best represent SARs. Yet, it remains unclear whether SARs follow other shapes at finer spatial grains in continuous vegetation. We asked which function describes SARs best at small grains and explored how sampling methodology or the environment influence SAR shape. Location Palaearctic grasslands and other non-forested habitats. Taxa Vascular plants, bryophytes and lichens. Methods We used the GrassPlot database, containing standardized vegetation-plot data from vascular plants, bryophytes and lichens spanning a wide range of grassland types throu…