Impact of anthropogenic disturbances on beetle communities of French Mediterranean coastal dunes

In coastal dunes, influenced by anthropogenic activities such as tourism, it is important to determine the relative influence of environmental factors at different spatial scales to evaluate the sensitivity of local communities to disturbances. We analyzed beetle communities of 14 dunes of the French Mediterranean coast: four in the relatively preserved Camargue area, and ten in the Var department, where tourism is intensive. Beetle communities were studied three times in early spring using sand sampling. Species-environment relationships were evaluated at the regional, landscape and local scale using redundancy analysis (RDA) and variability partitioning. About 28 species were identified, of which 15 were sand-specialist species, which accounted for more than 93% of total abundance. The beetle communities of Camargue were significantly different from those of the Var department owing to the pullulation of a Tenebrionid species (Trachyscelis aphodioides Latr.) in the Var, except for one restored dune where the community was very similar to those of Camargue. Our results showed no longitudinal gradient between the two regions. Local factors (dune height, preservation and disturbance index) significantly explained most of the variation in the dominance of T. aphodioides, while some other local factors were important for other psammophilous species. This study also suggests that dune beetle communities are strongly affected on beaches intensively managed for tourism, but beetles are still abundant in much disturbed sites

Continental-scale patterns in diel flight timing of high-altitude migratory insects

This is the final version. Available on open access from the Royal Society via the DOI in this recordData accessibility: The proportional migratory insect intensity and traffic data are available from the Zenodo repository: https://doi.org/10.5281/zenodo.10626690 [50].Many insects depend on high-altitude, migratory movements during part of their life cycle. The daily timing of these migratory movements is not random, e.g. many insect species show peak migratory flight activity at dawn, noon or dusk. These insects provide essential ecosystem services such as pollination but also contribute to crop damage. Quantifying the diel timing of their migratory flight and its geographical and seasonal variation, are hence key towards effective conservation and pest management. Vertical-looking radars provide continuous and automated measurements of insect migration, but large-scale application has not been possible because of limited availability of suitable devices. Here, we quantify patterns in diel flight periodicity of migratory insects between 50 and 500 m above ground level during March-October 2021 using a network of 17 vertical-looking radars across Europe. Independent of the overall daily migratory movements and location, peak migratory movements occur around noon, during crepuscular evening and occasionally the morning. Relative daily proportions of insect migration intensity and traffic during the diel phases of crepuscular-morning, day, crepuscular-evening and night remain largely equal throughout May-September and across Europe. These findings highlight, extend, and generalize previous regional-scale findings on diel migratory insect movement patterns to the whole of temperate Europe

Prosumer and Product Design Through Digital Tools

Currently, the growing interest of users and consumers in the participation of the creative process has led to the typical “maker culture” practices. Consequently, there is an increasing number of prosumers - users who produce what they consume - who want to be part of the design and transformation process of the products. In order to achieve it, prosumers have begun to use digital tools that greatly facilitate this task. These tools could vary depending on the number of users involved in the process and the freedom of participation that they have on the product. It has been presented a number of qualitative classification of cases involving the end user, individually or collectively, that has influenced as a prosumer in the product design process. The objective is to study the use of digital tools in the creative phase within the design process according to their different levels of participation with respect to the final product. The cases are shown in four tables according to the number of users involved in the process and their level of participation. In these tables, other important aspects related to the study of digital tools such as the type of contribution of the prosumer to the product or the design phase in which he participates will be identified. In conclusion, this work will show if there is a pattern in the use of digital tools according to the number of users involved in the process and the freedom of participation that they have and which are the reasons for their use

The Information Economy and the Labor Theory of Value

This article discusses aspects of the labor theory of value in the context of the information industries. First, taking the Temporal Single-System Interpretation (TSSI) of Marx’s labor theory of value as methodology, the paper calculates economic demographics at the level of socially necessary labor time and prices of an example case. Second, the paper questions the assumption that the labor theory of value cannot be applied to the information industries. This paper tests this hypothesis with an analysis of the development of labor productivity in six countries. The paper concludes that the labor theory of value is an important tool for understanding the information economy and the peculiarities of the information commodity

Gaming-playing on social media: using the psychoanalytic concept of ‘playing’ to theorize user labour on Facebook

Political economists have argued that user activity on corporate social media is regarded as labour that appears playful and fun but is exploited and sold to advertisers for profit maximization. This article begins with the working assumption that such user labour on social media constitutes a form of playing. It is theorized through a psychoanalytic perspective on the term as developed by D. W. Winnicott and André Green. The notion of gaming–playing is put forward to account for set interface structures on Facebook that resemble a game as well as free-flowing dimensions more akin to playing. Some user discourses on Facebook are analysed through this prism. A psychoanalytic conceptualization of user labour as playing allows one to analyse both positive discourses that emphasize Facebook as a space for creativity, exploration and the unknown, as well as negative discourses that critique the platform with regard to lacking privacy controls or data ownership. Both discourses are conducted in a playful manner that creatively utilize a sense of user agency in relation to others and Facebook itself, but often remain without consequences

‘Contextualizing and Critiquing the Fantastic Prosumer: Power, Alienation and Hegemony’

Abstract The ‘prosumer’ has emerged to become a central figure in contemporary culture. Through the melding of production with consumption, both mainstream and progressive analysts conceptualize prosumption to be a liberating, empowering and, for some, a prospectively revolutionary institution. In this article, these fantastic associations are critically assessed using an approach that situates prosumption activities, including contemporary online applications often referred to as ‘cocreation’, in three social-historical contexts: capitalism as a political economy dominated by mediated abstractions; capitalist society as a hierarchical order; and alienation as a pervasive norm. Among other conclusions, we find that prosumption (particularly its Web 2.0 iterations), constitutes an emerging hegemonic institution; one that effectively frames and contains truly radical imaginations while also tapping into existing predilections for commodity-focused forms of self-realization

Cold oxidation of hydrogen in a final nuclear repository

A material was developed to absorb hydrogen during its production in a final repository. The absorption material consists of electrolytically prepared MnO$_{2}$ catalytically activated by Ag$_{2}$O. The preparation technique of the material was optimized. The kinetics of hydrogen absorption was investigated. The capacity of the material was found to be 0.2 m$^{3}_{STP}$ H$_{2}$/kg MnO$_{2}$. The applicability of the material was shown by a demonstration test simulating the conditions in a rock salt repository

Extraction of uranyl nitrate, sulphate and chloride with tri-n-octyl amine (TOA) from aqueous solutions

Extraction of uranyl nitrate, chloride and sulphate with tri-n-octyl amine (TOA) in benzene as a function of the TOA concentration has been studied. The concentration based extraction equilibrium constants were calculated from the distribution data of the uranyl salts, fitting the parameters of a chemical model to the experimentally obtained extraction isotherms. The calculated equilibrium constants are 46.5, 89.4 and 4.2·104 for uranyl nitrate, chloride and sulphate, respectively. These values are in good agreement with the previously reported extraction equilibrium constants calculated by the inflection point method