Introduction : life at water's edge

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Conclusion : Confluences and distributaries in delta life

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Environmental management as situated practice

We propose an analysis of environmental management (EM) as work and as practical activity. This approach enables empirical studies of the diverse ways in which professionals, scientists, NGO staffers, and activists achieve the partial manageability of specific “environments”. In this introduction, we sketch the debates in Human Geography, Management Studies, Science and Technology Studies to which this special issue contributes. We identify the limits of understanding EM though the framework of ecological modernization, and show how political ecology and work- place studies provide important departures towards a more critical approach. Developing these further, into a cosmopolitical direction, we propose studying EM as sets of socially and materially situated practices. This enables a shift away from established approaches which treat EM either as a toolbox whose efficiency has to be assessed, or as simply the implementation of dominant projects and the materialisation of hegemonic discourse. Such a shift renders EM as always messy practices of engagement, critique and improvisation. We conclude that studying the distributed and situated managing agencies, actors and their practices allows to imagine new forms of critical interventions

On the Combination of Event Calculus and Empirical Semantic Drifts

The encoding and exploitation of semantics has been gaining popularity, as exemplified by the uptake of digital ontologies and knowledge graphs. However, the semantics of domain objects usually do not reflect how they evolved over time, i.e., which events their dynamic transitions are based on. While a number of methods have been proposed to trace events and their impacts on a domain, there is a paucity of approaches to effectively join them. Thus, we combine event calculus as an analytical approach for modeling causal relationships between events and effects with semantic drifts as an empirical approach for quantifying the impact of domain updates. We demonstrate how their respective weaknesses can be addressed and how their interaction can improve the representation of semantic transitions

Social Water

We encounter water every day. It is a vital substance biologically as much as socially. We may notice this in art exhibitions and university courses communicating submersed and subversive facts about water; the rhythms of floods and tides resonating with fishing techniques and conflict patterns; inundations carrying moral and political weight as much as water and pollution; and particular mixtures of water and land generating wealth, anxieties and memories. In short, wherever people deal with water, they are involved not only with a physical element, but also with social relations. In fact, whenever we pretend that water is foremost the molecule H2O, we ignore all the political, economic, infrastructural, emotional and legal aspects of this element without which water would not be what it is for us today. This issue explores some of the ways in which water is profoundly social, both in the sense of being co-produced by social life, and by being a core constituent of it. Some contributions to this issue do this through the examples listed above. Others illustrate the way water positions people and their perspectives. A few show how large water infrastructures reshuffle social lives. And some suggest that water may sometimes be better imagined as a word in the plural, rather than a singular, universal substance

A Solid Fluids Lexicon

In our discussions around the theme of solid fluids, we often had resort to everyday words, many of them of ancient derivation and rich in association. We decided to make a list of some of the words that came up most often – barring those that already figured as the principal characters of individual contributions – and to distribute among ourselves the task of writing a sort of mini-biography for each. The resulting lexicon with nineteen entries, ranging from ‘cloud’ and ‘concrete’ to ‘wave’ and ‘wood’, serves as a conclusion to the collection as a whole

Travel-associated Rabies in Austrian Man

Rabies developed in an Austrian man after he was bitten by a dog in Agadir, Morocco. Diagnosis was confirmed by reverse transcription–polymerase chain reaction and immunohistochemistry. The patient's girlfriend was bitten by the same dog, but she did not become ill

Effects of cold winters and roost site stability on population development of non-native Asian ring-necked parakeets (Alexandrinus manillensis) in temperate Central Europe – Results of a 16-year census

Asian ring-necked parakeets (Alexandrinus manillensis, formerly Psittacula krameri, hereafter RNP) first bred in Germany in 1969. Since then, RNP numbers increased in all three major German subpopulations (Rhineland, Rhine-Main, Rhine-Neckar) over the period 2003–2018. In the Rhine-Neckar region, the population increased to more than fivefold within only 15 years. Interestingly, there was no significant breeding range expansion of  RNP in the period 2010–2018. In 2018, the total number of RNP in Germany amounted to >16,200 birds. Differences in RNP censuses between years were evident. Surprisingly, cold winters (extreme value, −13.7 °C) and cold weather conditions in the breeding season (coldest month average, −1.36 °C) were not able to explain between-year variation. This finding suggests that in general winter mortality is low – with exceptions for winters 2008/2009 and 2009/2010, and a population-relevant loss of broods is low in our study population. Surprisingly, the social behaviour in terms of spatio-temporal stability of roost sites could well explain positive and negative population trends. Years of spatially stable and regularly used roost sites seem to correlate with increasing population sizes. In contrast, known shifts of RNP among different roost sites or the formations of new roost sites by split are related to population stagnation or a decrease in numbers. Climate change may lead to further range expansion as cities not suitable yet for RNP may become so in the near future.