Search results for "Threat"
showing 10 items of 318 documents
Seed germination reports for five species of the genus Silene (Caryophyllaceae)
2022
In this contribution, new germination data for five Silene taxa coming from the natural habitats of Sicily and Calabria are given. The investigated taxa are: the threatened endemic S. calabra and S. crassiuscula, together with S. colorata, S. fruticosa, and S. nicaeensis from Sicilian sites. Seed germinations were tested at the Catania Germplasm Bank (BGS-CT), at constant temperatures (from 5 to 30°C), under both light (12/12h photoperiod) and total darkness conditions. The results emphasized a high germination ability and rate in all examined species.
Building the jigsaw puzzle of the critically endangered Pleurotus nebrodensis: historical collection sites and an emended description
2011
Historical collection sites of the critically endangered Pleurotus nebrodensis were retraced in Sicily (southern Italy) using recently rediscovered documents and through interviews with local people. These localities were visited in 2009 and checked for the presence of this rare mushroom, confirming a continuing decline in fruiting. An emended description of the taxon is provided based on observations on abundant recently collected material. The need for more incisive action to safeguard this valuable mushroom by the University of Palermo, Regional Park of Madonie Administration and policy makers is emphasized.
LO STROBILO DI ABETE DELLE MADONIE (ABIES NEBRODENSIS) IN UN DISEGNO INEDITO DI ANGELINA DAMIANI LANZA
2017
The cone of Abies nebrodensis (Pinaceae) in an unreleased watercolored drawing by Angelina Damiani Lanza. – A watercolored drawing of the Abies nebrodensis cone, the endemic fir tree of the Madonie Mountains, in Sicily, for a long time considered extinct, is presented and commented on. Made by Angelina Damiani, daughter of architect Giuseppe Damiani Almeyda and husband of Domenico Lanza, the first Sicilian botanist who is interested in protecting the threatened tree species. The de- sign, donated by the daughter of the authoress, Maria Filippina Lanza Sangiuliano, and since 2006 exhibited in the small museum of the Palermo Botanical Garden, highlights the historical and scientific importanc…
CONSERVATION STATUS ASSESSMENT OF THE ENDEMIC HIERACIUM S. STR. (ASTERACEAE) OCCURRING IN SICILY
2022
The current status of the majority of apomictic taxa, and therefore their priorities for conservation, are poorly known, and consequently, they are neglected by conservationists. In Sicily 8 species and 4 subspecies of Hieracium s. str. occurs. Eleven taxa are endemic to the area, one has a wider distribution. These taxa were not evaluated within the recent project “Red List assessment of plants and fungi in Italy” because collectively considered with insufficient and unreliable distribution data. The global conservation status of the endemic Hieracium s. str. taxa occurring in Sicily was assessed here using the IUCN categories and criteria, on the basis of the data collected during field s…
Stable isotope analysis of trophic niche in two co-occurring native and invasive terrapins, Emys orbicularis and Trachemys scripta elegans
2016
A trophic niche overlap in native and alien turtle species can lead to competitive interactions whereby allochthonous turtles may outcompete autochthonous individuals and eventually affect viability of natural populations. The European pond turtle (Emys orbicularis) is an autochthonous species threatened by habitat encroachment and competition with the red-eared slider (Trachemys scripta elegans). The latter is an invasive species introduced in Europe from midwestern United States as a pet and now widespread in the natural habitats of E. orbicularis. The extent of trophic competition between E. orbicularis and T. s. elegans in northern Italy was assessed by nitrogen and carbon stable isotop…
Integrating functional traits into correlative species distribution models to investigate the vulnerability of marine human activities to climate cha…
2021
Climate change and particularly warming are significantly impacting marine ecosystems and the services they provided. Temperature, as the main factor driving all biological processes, may influence ectotherms metabolism, thermal tolerance limits and distribution species patterns. The joining action of climate change and local stressors (including the increasing human marine use) may facilitate the spread of non-indigenous and native outbreak forming species, leading to associated economic consequences for marine coastal economies. Marine aquaculture is one among the most economic anthropogenic activities threatened by multiple stressors and in turn, by increasing hard artificial substrates …
A century of fishery data documenting the collapse of smooth-hounds (Mustelusspp.) in the Mediterranean Sea
2017
Conservation and management of shark populations is increasingly becoming important in many marine regions, since there is a growing body of evidence showing that several species are threatened and continuing to decline because of unregulated fishing. Quantifying the extent of sharks' decline, the risk of species extinction, and the consequences for marine ecosystems have been challenging and controversial, mostly due to data limitations. In this study, more than one century of multiple-sources of bibliographic records on presence and frequency of occurrence of three species of commercial sharks, the smooth-hounds Mustelus spp., in the Mediterranean Sea were compiled and analysed. Generaliz…
The detrimental consequences for seagrass of ineffective marine park management related to boat anchoring.
2014
Posidonia oceanica (L.) Delile meadows are recognized as priority habitat for conservation by the EU Habitats Directive. The La Maddalena Archipelago National Park (Mediterranean Sea) P. oceanica meadow. , the dominant coastal habitat of the area, is mostly threatened by boat anchoring. 12. years after the establishment of mooring fields and anchoring restrictions, a study was conducted to measure their effectiveness on the conservation of seagrass and the mitigation of anchoring damage. We found that: (i) the condition of P. oceanica was disturbed, both in the mooring fields and in control locations; (ii) mooring fields and anchoring restrictions did not show to be an efficient system for …
Predicting the current and future global distribution of the invasive freshwater hydrozoan Craspedacusta sowerbii
2021
AbstractThe freshwater jellyfish Craspedacusta sowerbii is one of the most widespread invasive species, but its global distribution remains uncertain due to ephemeral appearances and general lack of information in various aquatic environments. The aim of this study was to map current and future distributions (2050 and 2100) using Species Distribution Models allowing to visualize the habitat suitability and make projections of its changes under potential climate change scenarios. Except in Oceania where the range decreased, an expansion of C. sowerbii was projected during the next century under modeled future scenarios being most intensive during the first half of the century. The present st…
Personalità, minaccia e autoritarismo di destra.
2011
In un campione di 318 studenti di psicologia, abbiamo analizzato le relazioni fra «Big Five», minaccia sociale percepita proveniente dalla microcriminalità e dal terrorismo e autoritarismo di destra (RWA). Per entrambe le forme di minaccia, coerentemente con le nostre ipotesi, l'Apertura ha influenzato l'RWA, sia direttamente sia indirettamente, attraverso la mediazione della minaccia percepita, mentre la Coscienziosità ha influenzato l'RWA solo direttamente. L'interazione fra Apertura e minaccia proveniente dalla microcriminalità, ma non quella terroristica, ha influenzato significativamente l'RWA. L'articolo si conclude con una proposta di interpretazione di questo mancato effetto e il su…