Search results for "Mediterranean"

Submerged macrophytes as key players in aquatic ecosystems under global change: a multiscale experimental approach

2020

El actual cambio global está causando alteraciones en los ecosistemas de todo el mundo a través de cambios interactivos en los principales factores ambientales (e.g. la temperatura, la concentración de nutrientes y la radiación ultravioleta). Los ecosistemas acuáticos continentales son altamente vulnerables ante estos cambios y, específicamente, en la región mediterránea, la situación es peor ya que la mayoría de estos sistemas son someros y están expuestos a las perturbaciones ambientales y antrópicas. Las praderas de macrófitos sumergidos y, particularmente, los carófitos, son un elemento conspicuo de estos sistemas con un papel fundamental en su funcionamiento. Estos organismos proveen d…

The controversial role of actors in Italian and Sicilian waterfront areas management and planning

2013

The paper investigates the relationship between planning tools and formal/informal subjects involved in Sicilian waterfront areas management and it focuses on the relation between port plans and other (local and regional) planning instruments and policies. This relationship is explored through an examination of some results of The “Waterfront” project (Water And Territorial policiEs for integRation oF multisectoRial develOpmeNT), developed under the PO 2007-2013 Italia-Malta, that aimed to explore the field of “waterfront” in a different sense from the simple concept of urban or peri-urban coastal areas. The waterfront, in the Project approach, takes a wider identity that refers to the comp…

SST Comparison of AVHRR and MODIS Time Series in the Western Mediterranean Sea

2020

La temperatura de la superficie del mar (SST) es un parámetro clave para comprender los procesos atmosféricos y oceánicos. Desde finales de la década de 1980, las imágenes de satélite infrarrojas se han utilizado para complementar los registros in situ para estudiar la variabilidad temporal y espacial de la SST. El radiómetro avanzado de muy alta resolución (AVHRR) del satélite de la Administración Nacional Oceánica y Atmosférica (NOAA) fue el primer sensor utilizado con éxito para calcular la SST después del desarrollo y validación del algoritmo de corrección atmosférica conocido como 'ventana dividida'. Más recientemente, el espectrorradiómetro de imágenes de resolución MODERADA (MODIS) a…

Pyrus pedrottiana (Rosaceae), a new species from the Nebrodi Mountains (N-E Sicily)

2022

A new species of Pyrus for the dendroflora of Sicily is here described. It is Pyrus pedrottiana, actually considered endemic to the Nebrodi Mountains, a territory which includes the largest wooded area of the island with a high forest biodiversity.In the same area, P. vallis-demonis and P. ciancioi have also been described in recent times. The authors report diagnostic characters to distinguish the new taxon from the other two sympatric species.

Regional metacommunities in two coastal systems: spatial structure and drivers of plant assemblages

2014

Aim Biogeographical patterns in metacommunities are still poorly understood, and different processes are expected to occur in different habitats. We analysed the regional plant metacommunities of coastal habitats to test whether (1) the influence of space and climate differs between two habitats differentiated along the seashore–inland gradient, and (2) regional variation in species composition of these habitats can be ascribed to different metacommunity paradigms. Location The entire coast of the Iberian Peninsula, south-western Europe. Methods We collected data on the plant species composition of coastal sites on sand dunes across 3000 km of coastline. The sites were classified into two h…

EFFETTI DELLA PROTEZIONE E DELLA COMPLESSITÀ TOPOGRAFICA SUI POPOLAMENTI BENTONICI DEI REEF A VERMETI

2009

Vermetid reef can be considered a key intertidal habitat of Mediterranean Sea and increasing knowledge about this natural system is important for its conservation. Aims of this study is to assess topography complexity, structure and composition of the benthic assemblages associated to reef formation in a marine protected area highlighting possible effects of the protection.

Holocene sea level change in Malta

2013

A multidisciplinary approach has been applied to study sea level changes along the coast of Malta using data collected from underwater archaeological remains. The elevation of archaeological markers have been compared with predicted sea level curves providing new bodies of evidence that outline the vertical tectonic behaviour of this region, allowing estimation of the relative sea level changes that occurred in this area of the Mediterranean since the Bronze Age. During the Roman Age, sea level was at −1.36 ± 0.1 m, while in the Midde Age it was at −0.56 ± 0.2 m, in agreement with previous estimations for the Mediterranean region. Data indicate that Malta was tectonically stable during the …

Välimeren itäosa

1577

A single tube PCR assay for detecting viruses and their recombinants that cause tomato yellow leaf curl disease in Mediterranean basin

2007

Tomato yellow leaf curl disease (TYLCD) is well known in Mediterranean countries, where it has been causing severe losses in tomato crops for decades. Until recently, two viruses (with several isolates) in the genus Begomovirus, family Geminiviridae, have been associated with the epidemics: Tomato yellow leaf curl virus (TYLCV) and Tomato yellow leaf curl Sardinia virus (TYLCSV). However, recombinants between these, such as Tomato yellow leaf curl Malaga virus (TYLCMalV), are spreading, and new methods for detecting all viruses present in the region are needed. By considering all DNA sequences available of viruses causing TYLCD in the Mediterranean basin, a PCR/RFLP protocol was developed t…

Shooting borders. Per una geogafia visuale delle migrazioni

2017

Our perceptions of events in the Mediterranean are strongly influenced by a range of visual practices that impact on both the emotional and the political. In this paper, I set out to critically explore the visual geographies underlying photographic images of contemporary migration flows across the Mediterranean Sea. I argue the need for a methodological shift from a content analysis approach to a critical investigation of the spatial interweaving of images, gazes and aesthetic regimes that governs both the production and reception of such photographs. Given these theoretical premises, I focus on three images of migrants being rescued in the Mediterranean to illustrate how photography can ac…