Search results for "Alien"
showing 10 items of 553 documents
Feature selection for distance-based regression: An umbrella review and a one-shot wrapper
2023
Feature selection (FS) may improve the performance, cost-efficiency, and understandability of supervised machine learning models. In this paper, FS for the recently introduced distance-based supervised machine learning model is considered for regression problems. The study is contextualized by first providing an umbrella review (review of reviews) of recent development in the research field. We then propose a saliency-based one-shot wrapper algorithm for FS, which is called MAS-FS. The algorithm is compared with a set of other popular FS algorithms, using a versatile set of simulated and benchmark datasets. Finally, experimental results underline the usefulness of FS for regression, confirm…
Exotic Ants (Hymenoptera, Formicidae) Invading Mediterranean Europe: a Brief Summary over About 200 Years of Documented Introductions
2019
Exotic ants have emerged as a relevant topic worldwide because of their remarkable impacts on native ecosystems and human activities. A first regional overview is given on the dozens of exotic ant species recorded in Mediterranean Europe since the end of the 19th century. About 39 exotic ant species, belonging to 17 genera and originating from 5 different biogeographical realms, are currently believed to be established in this region. The genera Nylanderia and Tetramorium are those hosting the larger proportion of species, while the Afrotropical realm is the prevalent source of taxa. According to the available data, France, Greece, Italy and Spain all host a high number of exotic species, w…
An unidentified harvestman Leiobunum sp. alarmingly invading Europe (Arachnida: Opiliones)
2007
Etwa seit dem Jahr 2000 breitet sich eine bisher nicht identifizierte Art der Gattung Leiobunum C. L. Koch, 1839 schnell in Mitteleuropa aus. Nachweise ab dem Jahr 2004 sind aus den Niederlanden (wahrscheinlich dem Land des ersten Auftretens in Europa), Deutschland, Österreich und der Schweiz bekannt. Die wahrscheinlich eingeschleppte Art besiedelt bisher lediglich Wände von Gebäuden und seltener felsähnliche Biotope in Wäldern. Adulte Individuen ruhen tagsüber selten einzeln oder in eng geklumpten Gruppen aus Dutzenden bis Hunderten von Individuen an leicht abgedunkelten Stellen in Mauerwinkeln, an glatten Hauswänden und überhängenden Dachtraufen. Jungtiere leben am Boden. Diese Art verfüg…
On the presence of the alien exotic sap beetle Phenolia (Lasiodites) picta (Macleay, 1825) (Coleoptera Nitidulidae) in Italy
2020
The exotic sap beetle Phenolia (Lasiodites) picta (W.S. Macleay, 1825) (Coleoptera Nitidulidae) is an alien species recently recorded in Europe (Spain, France, and Greece), and Turkey. For Italy, only a single record of P. cf. picta is reported from Sicily. In this paper, we studied this specimen confirming the presence of P. picta in Italy.
The invasion history of Elodea canadensis and E. nuttallii (Hydrocharitaceae) in Italy from herbarium accessions, field records and historical litera…
2022
AbstractWe analysed the invasion history of two North American macrophytes (Elodea canadensis and E. nuttallii) in Italy, through an accurate census of all available herbarium and field records, dating between 1850 and 2019, and a rich literature collection describing the initial introduction and naturalisation phase that supports the results obtained by the occurrence records. Elodea canadensis arrived in Italy before 1866 and had two invasion phases, between the 1890s and 1920s and between the 1990s and 2000s; E. nuttallii, probably arrived in the 1970s, started invading in 2000 and the invasion is still ongoing. Botanical gardens and fish farming played a crucial role in dispersal and na…
New Data on Native and Alien Vascular Flora of Sicily (Italy): New Findings and Updates
2023
In this paper, based on fieldwork and herbaria surveys, new data concerning the presence of 32 native and alien vascular species for Sicily (Italy) are provided. Among the native species, the occurrence of the following taxa is reported for the first time or confirmed after many decades of non-observation: Aira multiculmis, Arum maculatum, Carex flacca subsp. flacca, Mentha longifolia, Oxybasis chenopodioides, Najas minor and Xiphion junceum. Furthermore, we document the presence of three native species (Cornus mas, Juncus foliosus and Limonium avei) that, despite being repeatedly observed in Sicily and reported in the literature, are inexplicably omitted by the most recent authoritative ch…
Policy Alienation in Frontline Social Work – A Study of Social Workers’ Responses to a Major Anticipated Social and Health Care Reform in Finland
2021
Change in the policy and ideology governing social and health care has been much debated in the Western welfare states, including in Finland, where the public sector has witnessed a shift towards a market and managerial ideology in a climate of austerity. These changes affect organisations as well as individual workers. Social workers implement social policies in their daily work, and are thus positioned in between policies and clients. This may expose them to feelings of unease in the implementation of certain policies. In this study, we apply the policy alienation framework of Tummers and colleagues (2009. “Policy Alienation of Public Professionals: Application in a new Public Management …
Economic conditions and populist radical right voting: The role of issue salience
2021
Contains fulltext : 245174.pdf (Publisher’s version ) (Open Access) In this article, we show with the European Election Study from nine Western European countries that issue salience of the economy and immigration contributes to our understanding of the puzzling relation between economic conditions and populist radical right support. In countries with relatively weak or worsening economic conditions, the economy is considered more salient, whereas immigration loses salience – also compared to other issues. Voters who perceive the economy as most important problem are less likely to opt for the populist radical right than people who perceive immigration or even other issues as most important…
Differentiated Integration and Disintegration in the EU after Brexit : Risks versus Opportunities
2019
Differentiation is becoming an increasingly salient feature of European integration. The multi‐faceted European crisis and the subsequent Brexit vote (paving the way for a ground‐breaking case of differentiated disintegration) have led scholars and practitioners to think about the consequences of differentiated integration. This article draws on five well‐established models of differentiation experienced by countries both inside and outside the Union: the EEA model; the Danish model of (quasi‐)permanent differentiation; the Swedish model of de facto differentiation; the instrumental model; and the British model of differentiated disintegration. It addresses the different risks and opportuni…
Performative Regional (dis)Integration: Transnational Markets, Mobile Commodities, and Bordered North–South Differences
2011
Being implicated in an ambivalent play of both border crossing and drawing, global commodity chains are an ideal organizational field to analyze the fundamental paradox of global connectivity. Approaching the contingency of borders from a perspective informed by the performativity approach to markets, this paper starts from the assumption that this paradox is particularly salient in the context of commodity chains which connect the Global South with the Global North. Taking the example of one single agrocommodity, the tomato, and two border regions (Morocco–EU and Mexico–USA), we follow the links and heterogeneous associations which stretch from the border to the fields, supermarket shelves…