1,721,015 research outputs found
The floristic composition of Venetian relic woods: Quality and conservation status
No full textThe aim of the study was to collect up-to-date data on the floristic composition of fragments of relic woods in Venetian Po plain. For each forest a check list of the flora has been compiled. The floristic originality of woods has been confirmed: thanks to their geographic position they show the co-occurrence of Temperate-Continental species, Mediterranean and Balkanian elements. In order to evaluate the floristic quality, species were clustered in 7 ecological groups, on the basis of similar ecology and similar role inside the community. The group assignment was based on phytosociological affinity. Quality of the plant communities didn't show a gradual change from larger to smaller patches, with larger patches being characterised by a higher proportion of quality species, and both larger and smaller patches hosted rare and threatened forest species depending on their inner quality
Valutazione della funzionalità dei boschi planiziali relitti della pianura veneta orientale nella conservazione delle specie nemorli erbacee
No full textLa componente floristica dei relitti boscati della pianura veneta orientale: qualità e grado di conservazione
Full text linkThe floristic composition of venetian relic woods: quality and conservation status. The aim of the study was to collect up-to-date data on the floristic composition of fragments of relic woods in venetian Po plain. For each forest a check list of the flora has been compiled. The floristic originality of woods has been confirmed: thanks to their geographic position they show the co-occurrence of Temperate-Continental species, Mediterranean and Balkanian elements. In order to evaluate the floristic quality, species were clustered in 7 ecological groups, on the basis of similar ecology and similar role inside the community. The group assignment was based on phytosociological affinity.
Quality of the plant communities didn’t show a gradual change from larger to smaller patches, with larger patches being characterised by a higher proportion of quality species, and both larger and smaller patches hosted rare and threatened forest species depending on their inner quality
Valutazione della funzionalità dei boschi planiziali relitti della pianura veneta orientale per la conservazione delle specie nemorali erbacee.
Full text linkThe effects of fragmentation as a driver affecting environmental condition, habitat integrity and, consequently, the possibility of a long-term persistence of ancient forest species populations were evaluated.
A check list of the flora was compiled for each forest. Repeated samplings have been surveyed in spring and in late summer-autumn following a stratified random design. 80 permanent plot (25m x 25m) were fixed, randomly and proportionately to the correspondent surface, on the two woodland habitat types: 1) the “edge habitat”, that is the concentric zone up to 50 meters from woods
boundary and 2) the “core area”, the interior and protected zone.
Species were clustered in 7 ecological groups, on the basis of similar ecology and similar role inside the community. The group assignment was based on phytosociological affinity.
Binary data on occurrence of species in the 80 plots were used to perform Principal Coordinates Analysis (Sörensen Index).
For each woods we defined richness, structure (on the basis of ecological groups) and an index of floristic quality (FQAI). Species richness and FQAI have been related to environmental variables (area and age, that is time from last fragmentation event) using a linear regression approach.
Data analysis pointed out that three main indipendent variables affect habitat quality: surface, surrounding matrix and age.
Our data confirm woodlands patches are experiencing the “relaxation time”, namely the time taken for a community to reach a new equilibrium after an environmental disturbance. After fragmentation, woodlands have lost their typical structure and, at present, they
seem unable to assure a long-term conservation of herbaceous nemoral species
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
La componente floristica dei relitti boscati della pianura veneta: qualità e grado di conservazione
No full textVariations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
- …
