1,720,985 research outputs found
Cambiamenti del paesaggio nel sito Natura 2000 “Murgia Alta" e frammentazione delle praterie aride
No full textThis research aimed at evaluating the effectiveness of the process of Natura 2000 implementation at the national and regional levels in avoiding the loss and fragmentation of dry grasslands in the SCI/SPA IT9120007 “Murgia Alta” (Apulia region, Italy).
Based on a comparison between Corine Land Cover maps for years 1990, 1999, 2006, historic habitat fragmentation was analysed for the whole site extent by means of identification and quantification of fragmentation geometries and size variation intervals of the remaining focal habitat patches. Based on a 2006-2007 high-resolution land-use map, the current level of habitat fragmentation was assessed in 8 transects by a quantitative analysis of the landscape pattern, and by integrating indexes representing both the global and the local approach to landscape pattern analysis. The results indicate that heavy habitat loss and fragmentation occurred during the 1990-1999 period, mostly due to conversion to arable land. This period approximately corresponds to a delay in transposing the UE “Habitats” Directive at the national and regional levels. Negligible changes can be detected, at this scale, for the 1999-2006 period, after Natura 2000 site selection and boundary definition had been approved. Natura 2000 boundary definition in the study area can be considered as appropriate, as a very small surface of the focal habitat is found outside of Natura 2000.
An analysis at a finer scale and the joint use of different indices highlight the spatial variability of the current fragmentation and provides indications of the pressure nearby the focal habitat.
Besides quantifying the recent change and the current status of dry grasslands in the study area, this analysis shows that the integration of complementary information derived from different approaches and the availability of maps at different spatial scales are necessary to monitoring habitat fragmentation, both within and outside Natura 2000, an essential element for assessing the effectiveness of conservation policies
Pre-evaluation and rank sampling
No full textDifferent kinds of approach to landscape configuration analysis were applied to a benchmark
landuse/land cover map. A pre-evaluation landscape pattern analysis (LPA), a morphological
spatial pattern analysis (MSPA) a landscape mosaic analysis and a landscape variation
analysis, were carried out. These analyses provide a site and scale specific composite set of
indices which can be used as a change biodiversity indicator set with reference to the CBDSEBI
focal areas: status and trends of the components of biological diversity, Ecosystem
integrity, and ecosystem goods and services.
Keywords Landscape pattern analysis, morphological spatial pattern analysis, landscape mosaic
analysis, landscape variation analysis habitat fragmentation, biodiversity, indicator
Pre-evaluation and rank sampling.BIO SOS Biodiversity Multisource Monitoring System: from Space TO Species (BIO SOS) Deliverable D6.3, pp57 http://www.biosos.wur.nl/UK/Deliverables/
No full textDifferent kinds of approach to landscape configuration analysis were applied to a benchmark
landuse/land cover map. A pre-evaluation landscape pattern analysis (LPA), a morphological
spatial pattern analysis (MSPA) a landscape mosaic analysis and a landscape variation
analysis, were carried out. These analyses provide a site and scale specific composite set of
indices which can be used as a change biodiversity indicator set with reference to the CBD/SEBI
focal areas: status and trends of the components of biological diversity, Ecosystem
integrity, and ecosystem goods and service
Selected bio-indicators. BIO SOS Biodiversity Multisource Monitoring System: from Space TO Species (BIO SOS) Deliverable D6.6, pp32 http://www.biosos.wur.nl/UK/Deliverables/ D6.6_Abstract
No full textTo identify appropriate bio-indicators species for BIO_SOS we
have used existing datasets (as indicated in D4.1) and we have
checked a recent scientific literature in order to provide a
scientific consistent selection of bio-indicator species. Our
choice is based on (i) the possibility to compare niche models
with and without GHCs; (ii) the usefulness for stakeholders; (iii)
the possibility to carry out comparison among different sites; and
(iv) the actual availability of the distributional data
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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