Search results for "Danger"
showing 10 items of 264 documents
On the mend of bryophyte conservation in Spain: preparing a proposal for the inclusion of bryophytes in national species protection catalogues
2018
The Spanish bryoflora contains 1291 taxa, 272 of them included in the Spanish Red List under any threat category. Although bryophytes show a low rate of endemicity compared to vascular flora, Spanish administration’s responsibility for the conservation of these plants is very high, since the country has 63 exclusive or rare species on a European or world scale. However, the representation of this group of plants in the Spanish legislation on species conservation is merely anecdotal. Royal Decree 139/2011 of 4 February develops a list of wild protected species (LESRPE and CEEA, Spanish abbreviations) and includes only 10 species of bryophytes, all of them from the Directive Habitats and the …
Responsabilità per danno da farmaco tra gestione del rischio e ruolo delle informazioni
2022
Il contributo, dopo aver analizzato le conseguenze dell’inclusione della responsabilità per i danni da prodotti farmaceutici all’interno del regime della responsabilità del produttore da prodotto difettoso ovvero del paradigma di responsabilità da attività pericolose, indaga criticamente le più recenti decisioni sulla responsabilità del produttore farmaceutico, soffermandosi sulla valenza assunta dalle informazioni. In un contesto in cui le esigenze di protezione della persona richiedono un rafforzamento della tutela del consumatore, sarebbe opportuno, anche alla luce del principio di precauzione, tenere in conto il profilo della gestione del rischio e individuare nuove prospettive di tutel…
Pensar el riesgo. En diálogo con Luhmann
2010
RESUMEN La sociología del riesgo es una de las derivaciones más importantes de la teoría de sistemas de Luhmann. Riesgo no es una realidad sino un esquema de observación característico de nuestro tiempo. El concepto de riesgo es siempre parte de una dicotomía y Luhmann analiza dos posibilidades: riesgo-seguridad, riesgo-peligro. Esta última distinción es la que permite una gestión del riesgo capaz de asignar responsabilidades mediante el manejo de la noción de imputación. Hay una tendencia muy significativa a transformar peligros en riesgos. Los sistemas generan y trabajan con riesgos, que distribuyen y transforman. Aquí se analizan algunos de los riesgos del sistema jurídico. Los riesgos …
La sociedad del riesgo y el derecho de la sociedad
2010
Resumen Riesgo es la contingencia de un daño. Contingente es aquello que puede ser y puede no ser. Contingencia se opone a imposibilidad y necesidad, porque contingente es aquello que no es ni imposible ni necesario. De la misma manera, los antónimos de riesgo son seguridad y certeza. Estos binomios contingencia/necesidad y, sobre todo, riesgo/seguridad son los que elegiría cualquier jurista especializado para comenzar a hablar del derecho del riesgo en las sociedades contemporáneas. En este trabajo, sin embargo, nos apartaremos de este camino y seguiremos otro más arriesgado. Construiremos el concepto de riesgo a partir de la diferencia riesgo/peligro y después valoraremos que trascendenc…
Intestinal helminths of a landlocked ringed seal (Phoca hispida saimensis) population in eastern Finland.
2003
A small, landlocked, endangered ringed seal (Phoca hispida saimensis) population lives as a postglacial relict in Lake Saimaa in eastern Finland. In this study, the intestinal metazoans were examined from a total of 61 Saimaa seals found dead from 1981 to 2001. The helminth fauna was very depauperate. Only one acanthocephalan species, Corynosoma magdaleni, has been able to survive during isolation in the freshwater environment. In addition, only two cestode species were found: Diphyllobothrium ditretum and Schistocephalus sp. However, neither of these larvae developed in the ringed seals. As the newborn pups of Saimaa seals are nursed for about 2 months only one of them was infected by C. m…
Does Forest Fragmentation and Selective Logging Affect Seed Predators and Seed Predation Rates of Prunus africana (Rosaceae)?
2007
Forest fragmentation and selective logging can influence the life cycle of tropical tree species at several levels, e.g., by lowering pollination, by limiting seed dispersal, and by increasing seed predation. Understanding human-induced modifications in ecosystem processes such as seed predation is essential for conservation management of threatened species. We studied the impact of forest fragmentation and selective logging on seed predation of the endangered tree Prunus africana in the tropical rain forest of Kakamega, Kenya. We quantified the activity of seed predators in the main forest, forest fragments, and in sites of different logging intensity in the dry and rainy seasons of 2003 a…
Micropropagation of Endemic Endangered Taxa of the Italian Flora: Adenostyles alpina subsp. macrocephala (Asteraceae), as a Case Study
2023
The conservation of endangered, rare, and endemic plant species is based on in situ and ex situ conservation strategies. When in situ conservation alone is not sufficient to guarantee the survival of the species, ex situ techniques are adopted in support. This study aimed to develop an efficient micropropagation protocol for Adenostyles by evaluating the effect of different plant growth regulators on leaf explants. Adenostyles alpina subsp. macrocephala (Asterace) is a perennial herbaceous plant endemic to Calabria (Southern Italy). The genus Adenostyles includes three species confined to the mountains of the Mediterranean and southern Europe. For callus induction, media supplemented with d…
Combining ecological engineering and plant conservation on a Mediterranean islet
2012
This paper reports the results of a bioengineering intervention within the Mediterranean Basin carried out at Lampedusa Island (Strait of Sicily) on the “Spiaggia dei Conigli”, the only sand shore of all Sicilian territory where the sea turtle Caretta caretta lays its eggs every year. The erosion of the steep slope over the beach itself caused sensitive changes in the grain size of shore’s sediment and reduced the area of the beach with fine sand suitable for C. caretta oviposition. In order to reduce surface water flow and to stop erosion, several bioengineering options were adopted using only native plant species to preserve local botanical heritage and to prevent the local extinction of …
Seed germination in Abies nebrodensis (Pinaceae)
2019
Abies nebrodensis is a strict Sicilian endemic species, listed as “Critically Endangered” in the IUCN Red List of Threatened Species. Seed production highly varies annually and among specimens. The species is affected by a very low seed germination rate, mainly depending on the large number of empty seeds (from 68 to 96%). The embryo presence in seeds increases with increasing seed size and weight. Optimal germination rate (61%) was achieved at constant 5°C in the darkness. The low proportion of embryos in seeds is a relevant threat for A. nebrodensis conservation, as it affects the intrapopulation genetic diversity and reduces the potential genetic variability of seed accessions preserved …
Flower and fruit structure of the endangered species Petagnaea gussonei (Sprengel) Rauschert (Saniculoideae, Apiaceae) and implications for its repro…
2015
Petagnaea gussonei (Apiaceae) is an endangered species endemic to the Nebrodi mountains (north-eastern Sicily). Although an increasing number of studies have been performed on this species, its reproductive biology remains poorly understood. The aim of this study was to investigate in detail the structure of the flower and the fruit of Petagnaea, and the possible implications for its breeding system and seed dispersal mechanism. Results from fieldwork, light microscopy and scanning electron microscopy suggest (1) the presence of protandrous hermaphrodite flowers; (2) geitonogamy, autogamy, and allogamy as breeding system mechanisms of P. gussonei, even if asexual reproduction is preferred b…