Search results for "Landscape"

The role of landscape, topography, and geodiversity in explaining vascular plant species richness in a fragmented landscape

2016

We explained vascular plant species richness patterns in a 286 km(2) fragmented landscape with a notable human influence. The objective of this study was two-fold: to test the relative importance of landscape, topography and geodiversity measures, and to compare three different landscape-type variables in species richness modeling. Moreover, we tested if results differ when only native species are considered. We used generalized linear modeling based variation partitioning and generalized additive models with different explanatory variable sets. Landscape and topography explained the majority of the variation but the relative importance of topography and geodiversity was higher in explainin…

Contributo alla conoscenza della vegetazione e del paesaggio vegetale della Riserva Naturale “Monte Cofano” (Sicilia occidentale).

2008

It is here presented the results of a study of the phytosociological and plant landscape of Mount Cofano Natural Reserve (Custonaci, Trapani) together with a cartographic representation to a scale of 1:10000 (reduced to a scale of 1:20000). The studied area is localised along the western side of Sicily island and it is spread out for 537,5 ha, dominated by Mt. Cofano rocky promontory (659 mts.), regarded as one of the most interesting biotopes of the regional territory linked to its floristic, zoological and environmental features. From a geolithological point of view, the area is characterized by carbonathic substrata relative to Monte Sparacio-Monte Cofano and Monte Speziale-Monte Palatim…

Sistemi ambientali e Rete Natura 2000 della Regione Basilicata: scoprire e proteggere gli ambienti naturali e i paesaggi culturali della Lucania

2015

Managing a boreal forest landscape for providing timber, storing and sequestering carbon

2015

Human well-being highly depends on ecosystem services and this dependence is expected to increase in the future with increasing population and economic growth. Studies that investigate trade-offs between ecosystem services are urgently needed for informing policy-makers. We examine the trade-offs between a provisioning (revenues from timber selling) and regulating (carbon storage and sequestration) ecosystem services among seven alternative forest management regimes in a large boreal forest production landscape. First, we estimate the potential of the landscape to produce harvest revenues and store/sequester carbon across a 50-year time period. Then, we identify conflicts between harvest re…

Rapid growth of Atlantic salmon juveniles in captivity may indicate poor performance in nature

2011

Abstract The hatchery environment often favours completely different traits than natural selection in the wild. Consequently, hatchery-reared fish are usually larger and more aggressive than their wild counterparts. Increased growth rate and aggression are predicted to be beneficial in feeding competition in hatcheries, but not necessarily in nature, where food resources are spatially and temporally more variable. We compared the growth, condition and mortality of landlocked Atlantic salmon (Salmo salar L.) juveniles in a common hatchery environment and when feeding on natural prey in semi-natural channels. We found that the growth and survival probability of the fish in the hatchery was ne…

Woodland key habitats evaluated as part of a functional reserve network

2010

Abstract Woodland key habitats (WKHs) represent a potentially cost-efficient means to protect biodiversity in managed forests. The Forest Act of Finland defines 13 habitat types of WKHs, which enjoy legal protection. It has been argued that WKHs are too small-sized and scattered in occurrence to be actually important in the maintenance of forest biodiversity. However, from the species’ perspective, WKHs form a network together with nature reserves. We evaluated the value and role of WKHs as a part of the whole reserve network using a graph-theoretical connectivity approach in three areas (ca. 500 km 2 each) located in Central Finland. The networks were formed separately for different habita…

Low effective population sizes and limited connectivity inxerothermic beetles: implications for the conservation ofan endangered habita

2014

Fragmentation and isolation may have detrimental effects on the viability of populations. Xerothermic grasslands, which are extra-zonal analogues of steppes, are among Europe's most endangered natural environments. Information about connectivity between the remaining habitat patches is critical for effective conservation planning. However, very little is known about the actual levels of isolation of individual xerothermic patches at the inter-regional and local scale. In this study, 16 microsatellite loci were used to investigate genetic diversity, structuring, effective sizes (Ne), and connectivity among populations of the weevil Centricnemus leucogrammus at various geographic scales. Anal…

L’insondabile bellezza del “silenzio” nei paesaggi del domani

2023

Il contributo intende affrontare il tema del rapporto tra architettura e natura attraverso il ruolo strutturante che il paesaggio antropizzato svolge per quel tipo di progetto che fonda la sua essenza costitutiva sulla dimensione fisica e trascendente dei luoghi, nel senso della nozione kantiana di Stimmung. Una nozione sussunta all'interno di una condizione più ampia di tonalità emozionale che pervade il paesaggio inteso come scopo principale dell'architettura. Ovvero l'area privilegiata della riflessione teorica, della ricerca della poiesis, intesa come actio transiens, e della práxis, intesa come processo operativo che trova il senso del suo sviluppo all'interno dell'azione progettuale s…

Impact of land-use type and harvesting on population structure of a non-timber forest product-providing tree in a semi-arid savanna, West Africa

2011

Non-timber forest products (NTFPs) strongly contribute to livelihood security in the semi-arid tropics. Main factors determining the populations of NTFP-providing species are human activities. This study examined the impact of land-use, combined with rates and patterns of debarking and chopping on a NTFP-providing tree (Anogeissus leiocarpa) in Burkina Faso. We compared stands in a protected area (W National Park) with those of its surrounding communal area (fallows, croplands) in order to (i) obtain an indication on the status of the population, (ii) assess its harvesting tolerance, (iii) estimate the sustainability of present management, and (iv) derive which additional management strateg…

The Role of the Night & the Northern Lights in the Production of a New Touristic Imaginary of the North

2015

International audience; Our work is based on empirical observation: the development of a tourist offer proposing to observe the northern lights in some Nordic areas. We place these developments in a broader dynamic of changes in our relationship to the night. These changes find a translation in a tourism that takes the night and its environmental resources as objects. This communication focuses on a particular object of these tourist dynamics: the northern lights. We formulate the following hypothesis: the erosion by the urban lighting of the “natural” night and of the accessibility to its “environmental resources” (as the starry sky, for example) provides an opportunity for some areas of l…