Search results for "Espècies amenaçades"
showing 7 items of 7 documents
Plant micro-reserves in Valencia (E. Spain): A model to preserve threatened flora in China?
2017
The Valencian Community (eastern Spain) was the pioneer territory establishing plant micro-reserves (PMRs). Its model to protect small sites for endemic and endangered plants has been exported to several countries around the globe. This paper highlights 1) the role of PMRs to complement the protection provided by large protected areas, 2) how the establishment of PMRs fosters the increase of floristic knowledge, and 3) the fact that continuous monitoring of PMRs also yields new records of endangered species found within the same PMRs. The flexibility of the PMR approach -it can be adapted to other national and regional legislations- allows its transfer to other rich-biodiversity regions and…
New populations of the threatened fern Equisetum moorei Newman in the Valencian Community (Spain)
2020
Se aportan nuevas citas del helecho amenazado Equisetum moorei en la Comunidad Valenciana, donde solo se conocían previamente seis localidades con presencia actual de la especie. Una de las nuevas poblaciones amplía notablemente el área de distribución conocida en esta región, ya que la mayor parte de las localidades conocidas se concentraban en el macizo del Peñagolosa (provincia de Castellón). Se describen las características ecológicas y demográficas de las nuevas localidades en el contexto de las poblaciones previamente conocidas en la región valenciana.
The conservation status of the world's freshwater molluscs
2021
With the biodiversity crisis continuing unchecked, we need to establish levels and drivers of extinction risk, and reassessments over time, to effectively allocate conservation resources and track progress towards global conservation targets. Given that threat appears particularly high in freshwaters, we assessed the extinction risk of 1428 randomly selected freshwater molluscs using the IUCN Red List Categories and Criteria, as part of the Sampled Red List Index project. We show that close to one-third of species in our sample are estimated to be threatened with extinction, with highest levels of threat in the Nearctic, Palearctic and Australasia and among gastropods. Threat levels were hi…
Situación de las poblaciones del Galápago europeo (Emys orbicularis, L., 1758) y el Galápago leproso (Mauremys leprosa, Schweigger, 1812) en la provi…
2000
Se analiza la situación actual de las poblaciones de Emys orbicularis y Mauremys leprosa en Castellón, aportando datos sobre su distribución en cuadrículas UTM de 10 km de lado. E. orbicularis está presente en 11 localidades, todas ellas de la franja litoral. En cambio, M. leprosa es exclusiva de ríos del interior de la provincia, estando presente al menos en seis puntos. La presencia de esta especie fue independiente de los valores de pH, conductividad o salinidad, mientras que E. orbicularis aparece asociada a aguas salobres y de conductividad elevada. Se estudió igualmente la distribución de Trachemys scripta como especie competidora, confirmándose la presencia en cuatro localidades. -- …
The European Union can afford greater ambition in the conservation of its threatened plants
2021
The importance of Natura 2000 network for the conservation of natural habitats, wild flora and fauna at European level is undeniable. However, it may not have reached its full potential since the loss of biodiversity continues to increase year on year. Further on, a third of the plant species listed in the Habitats Directive to guide the declaration of European Union Natura 2000 network of protected areas is not threatened and there is broad agreement on the need to review and update the species list. Here, the effectiveness of Natura 2000 in the conservation of Spanish bryophytes and vascular plants included in the Habitats Directive Annex II is analysed and compared with the one offered t…
On the synonymization of Acaulon longifolium Herrnst. & Heyn with Acaulon fontiquerianum Casas & Sérgio (Pottiaceae)
2021
During bryological work conducted in the Sharon plane region (Israel), a colony of Acaulon Müll. Hal. was discovered. The plants showed morphological affinities both to A. longifolium Herrnst. & Heyn and A. fontiquerianum Casas & Sérgio depending on the floras used for their identification which challenged their recognition as separate species. In order to solve this taxonomic dilemma, we conducted a detailed morphological characterization of the two species based on representative samples. The micromorphological study of vegetative, sporophytic and spore traits revealed the large overlap of range values between both species. Both species showed the characteristic combination of morphologic…
Reforzamientos poblacionales de Otanthus maritimus (L.) Hoffmanns. & Link (Compositae) en la Comunidad Valenciana (E de España)
2007
Otanthus maritimus (Compositae) es un taxon presente en escasas playas de la Comunidad Valenciana y amenazado por el turismo y urbanismo. A lo largo de varios años se han venido realizando repoblaciones y reforzamientos poblacionales en diversos tramos costeros utilizando diferentes métodos. Asimismo, se han llevado a cabo pruebas de viabilidad de las semillas. El presente artículo ofrece los resultados de unos y otros trabajos. -- Abstract: Otanthus maritimus (Compositae) is a taxon found only in few beaches of the Comunidad Valenciana and is therefore threatened by tourism and urbanism. During the last years, the authors have made seed viability tests as well as dune refforestations and r…