1,721,000 research outputs found
Vegetation classification and conservation aspects of Atlantic dune pine forests in the southwest of the Iberian Peninsula
Full text linkThis study refines the classification framework for Portuguese dune pine forests included in the alliance Coremato albi-Pinion pinastri at the association level after the syntaxonomic revision of Mediterranean pine forests of the class Pinetea halepensis. We collected 61 original vegetation plots between 2017 and 2022 in the southwestern Iberian Peninsula, analysing them through Principal Coordinate Analysis (PCoA) and UPGMA clustering. Numerical analysis identified four associations within the alliance Coremato albi-Pinion pinastri, specific to the sandy Atlantic coast of the Iberian Peninsula. Of these, three associations are newly described (Cytiso grandiflori-Pinetum pinastri, Aristolochio baeticae-Pinetum pineae, and Ulici australis-Pinetum pineae). Our study classified pine forests on sand in southwestern Iberia and identifies conservation-significant species in their understory. The floristic diversity in these psammophilous pine forests is enhanced by numerous endemics and relic species from the Tertiary period, shaped by past climatic refugia and multiple floristic migration routes, including Atlantic, Mediterranean, and North African pathways. This has resulted in a unique blend of thermophilic, oceanic, and xeric species with high conservation value. Our study contributes to the understanding of Atlantic dune pine forest ecology and inform habitat conservation efforts
TDV-optimization: A novel numerical method for phytosociological tabulation
No full textVolume: 6Start Page: 99End Page: 12
Distribution maps of vegetation alliances in Europe
No full textAbstract Aim The first comprehensive checklist of European phytosociological alliances, orders and classes (EuroVegChecklist) was published by Mucina et al. (2016, Applied Vegetation Science , 19 (Suppl. 1), 3–264). However, this checklist did not contain detailed information on the distribution of individual vegetation types. Here we provide the first maps of all alliances in Europe. Location Europe, Greenland, Canary Islands, Madeira, Azores, Cyprus and the Caucasus countries. Methods We collected data on the occurrence of phytosociological alliances in European countries and regions from literature and vegetation‐plot databases. We interpreted and complemented these data using the expert knowledge of an international team of vegetation scientists and matched all the previously reported alliance names and concepts with those of the EuroVegChecklist. We then mapped the occurrence of the EuroVegChecklist alliances in 82 territorial units corresponding to countries, large islands, archipelagos and peninsulas. We subdivided the mainland parts of large or biogeographically heterogeneous countries based on the European biogeographical regions. Specialized alliances of coastal habitats were mapped only for the coastal section of each territorial unit. Results Distribution maps were prepared for 1,105 alliances of vascular‐plant dominated vegetation reported in the EuroVegChecklist. For each territorial unit, three levels of occurrence probability were plotted on the maps: (a) verified occurrence; (b) uncertain occurrence; and (c) absence. The maps of individual alliances were complemented by summary maps of the number of alliances and the alliance–area relationship. Distribution data are also provided in a spreadsheet. Conclusions The new map series represents the first attempt to characterize the distribution of all vegetation types at the alliance level across Europe. There are still many knowledge gaps, partly due to a lack of data for some regions and partly due to uncertainties in the definition of some alliances. The maps presented here provide a basis for future research aimed at filling these gaps.European Social Fund https://doi.org/10.13039/501100004895Latvijas Universitate https://doi.org/10.13039/501100005414Fundação para a Ciência e a Tecnologia https://doi.org/10.13039/501100001871Grantová Agentura České Republiky https://doi.org/10.13039/501100001824Javna Agencija za Raziskovalno Dejavnost RS https://doi.org/10.13039/50110000432
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
Environmental and landscape rehabilitation plans : the case of Foz de Tua dam
Full text linkThe construction of Foz de Tua dam caused a severe environmental change at local level,
producing a considerable visual impact that must be remedied and the disturbed area must be
rehabilitated and recovered, approaching to the previous landscape before the dam construction.
The affected area is close to the Alto Douro Vinhateiro World Heritage, what means special care
is needed, considering at same time the humanized landscape and also the natural characteristics
present in the area, namely for the vegetation.
With this work, several interventions were proposed, aiming to reduce the visual impact
caused namely by slope excavation, but also by vegetation removing, needed for the Foz Tua
dam construction. For vegetation recovery, natural vegetation was identified and a recovery plan
were developed, aiming to reproduce the previous landscape configuration by planting and
seedling, considering both natural vegetation and cultivated areas structures. For exposed rocks
we started some assays with the purpose of find a treatment for fresh cutted granite that could be
used as a general rock treatment for visual impact of fresh excavated rocks. Some organic
mixtures were tried, using also autochthonous lichens and moss, as well as chemical treatments,
like acid or paint. Granite blocks were selected and five different treatments were applied to
cover the fresh granitic blocks and trigger their colonization and aging. The experiment has been
established on two groups of blocks, one submitted to irrigation three times a week and the other
group does not. Each treatment had two repetitions per group. Two blocks for control were also
established in each group to interpret the gaps of variation in comparison to the treated blocks.
All the stone blocks were maintained in a greenhouse, with controlled temperature and humidity.
The monitoring of the treatment was by taking pictures every 20 days, that were analyzed using
RGB color characteristics and parameters that shows the evolution of pigmentation of the blocks.
The results of this study show that three or at least two from the five experimented treatments are
recommended to use in the disturbed area. The irrigation can be recommended also for the two to
three first weeks after treatments establishment.A construção da barragem de Foz de Tua causou uma grave mudança ambiental a nível
local, produzindo um impacto visual considerável que deve ser corrigida e a área perturbada deve
ser reabilitada no sentido de repor, tanto quanto possível, da paisagem anterior à obra. A área
afetada está próxima do Alto Douro Vinhateiro Património Mundial, o que exige um cuidado
especial, considerando ao mesmo tempo a paisagem humanizada e também as características
naturais presentes na área, nomeadamente para a vegetação.
Com este trabalho, foram propostas várias intervenções, com o objetivo de reduzir o
impacto visual causado, nomeadamente pela escavação das encostas, mas também pela remoção
da vegetação, necessária à construção da barragem de Foz Tua. Para a recuperação da vegetação,
foi preparado um plano de plantação, com o objetivo de reproduzir a configuração da paisagem
anterior à construção, considerando também a estrutura da vegetação das áreas cultivadas. Para
rochas expostas, iniciamos alguns ensaios com o propósito de encontrar um tratamento para
granito cortado fresco com o intuito de reduzir o impacto visual da rocha recentemente cortada.
Algumas misturas orgânicas foram testadas, usando líquenes e musgo autóctones, bem como
tratamentos químicos, como ácido ou tinta. O ensaio foi estabelecido em blocos graníticos
cortados frescos, mantendo-se dois grupos de blocos, um recebendo irrigação três vezes por
semana e o outro grupo não. Cada tratamento teve uma repetição por grupo. Dois blocos de
controle também foram estabelecidos em cada grupo para interpretar as lacunas de variação em
comparação com os blocos tratados. Todos os blocos foram mantidos em estufa com temperatura
e humidade controlados. Foi efetuada a recolha de fotos a cada 20 dias e analisada a evolução das
intensidades e parâmetros de luz RGB dos blocks de rocha tratados e respetiva pigmentação. Os
resultados mostraram que três dos tratamentos resultaram em alteração da cor da rocha, podendo
ser recomendados para uso na área perturbada
Variations 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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Environmental and landscape rehabilitation plans : the case of Foz de Tua dam
Full text linkThe construction of Foz de Tua dam caused a severe environmental change at local level,
producing a considerable visual impact that must be remedied and the disturbed area must be
rehabilitated and recovered, approaching to the previous landscape before the dam construction.
The affected area is close to the Alto Douro Vinhateiro World Heritage, what means special care
is needed, considering at same time the humanized landscape and also the natural characteristics
present in the area, namely for the vegetation.
With this work, several interventions were proposed, aiming to reduce the visual impact
caused namely by slope excavation, but also by vegetation removing, needed for the Foz Tua
dam construction. For vegetation recovery, natural vegetation was identified and a recovery plan
were developed, aiming to reproduce the previous landscape configuration by planting and
seedling, considering both natural vegetation and cultivated areas structures. For exposed rocks
we started some assays with the purpose of find a treatment for fresh cutted granite that could be
used as a general rock treatment for visual impact of fresh excavated rocks. Some organic
mixtures were tried, using also autochthonous lichens and moss, as well as chemical treatments,
like acid or paint. Granite blocks were selected and five different treatments were applied to
cover the fresh granitic blocks and trigger their colonization and aging. The experiment has been
established on two groups of blocks, one submitted to irrigation three times a week and the other
group does not. Each treatment had two repetitions per group. Two blocks for control were also
established in each group to interpret the gaps of variation in comparison to the treated blocks.
All the stone blocks were maintained in a greenhouse, with controlled temperature and humidity.
The monitoring of the treatment was by taking pictures every 20 days, that were analyzed using
RGB color characteristics and parameters that shows the evolution of pigmentation of the blocks.
The results of this study show that three or at least two from the five experimented treatments are
recommended to use in the disturbed area. The irrigation can be recommended also for the two to
three first weeks after treatments establishment.A construção da barragem de Foz de Tua causou uma grave mudança ambiental a nível
local, produzindo um impacto visual considerável que deve ser corrigida e a área perturbada deve
ser reabilitada no sentido de repor, tanto quanto possível, da paisagem anterior à obra. A área
afetada está próxima do Alto Douro Vinhateiro Património Mundial, o que exige um cuidado
especial, considerando ao mesmo tempo a paisagem humanizada e também as características
naturais presentes na área, nomeadamente para a vegetação.
Com este trabalho, foram propostas várias intervenções, com o objetivo de reduzir o
impacto visual causado, nomeadamente pela escavação das encostas, mas também pela remoção
da vegetação, necessária à construção da barragem de Foz Tua. Para a recuperação da vegetação,
foi preparado um plano de plantação, com o objetivo de reproduzir a configuração da paisagem
anterior à construção, considerando também a estrutura da vegetação das áreas cultivadas. Para
rochas expostas, iniciamos alguns ensaios com o propósito de encontrar um tratamento para
granito cortado fresco com o intuito de reduzir o impacto visual da rocha recentemente cortada.
Algumas misturas orgânicas foram testadas, usando líquenes e musgo autóctones, bem como
tratamentos químicos, como ácido ou tinta. O ensaio foi estabelecido em blocos graníticos
cortados frescos, mantendo-se dois grupos de blocos, um recebendo irrigação três vezes por
semana e o outro grupo não. Cada tratamento teve uma repetição por grupo. Dois blocos de
controle também foram estabelecidos em cada grupo para interpretar as lacunas de variação em
comparação com os blocos tratados. Todos os blocos foram mantidos em estufa com temperatura
e humidade controlados. Foi efetuada a recolha de fotos a cada 20 dias e analisada a evolução das
intensidades e parâmetros de luz RGB dos blocks de rocha tratados e respetiva pigmentação. Os
resultados mostraram que três dos tratamentos resultaram em alteração da cor da rocha, podendo
ser recomendados para uso na área perturbada
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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