This paper presents a systematic assessment of transboundary water treaties and their institutional evolution over time. While the majority of treaties tend to remain unchanged, others are renegotiated over time, either gradually by treaty amendment or abruptly by treaty replacement. This study examines the sources of treaty amendment, treaty replacement, and renegotiation. Treaty design features, such as conflict resolution mechanisms and duration mechanisms, make up the set of independent variables. Effects are also measured for a set of control variables including the geographical configuration of a basin, the number of signatories, a history of interstate militarized disputes, water variability, the basin’s climate zone, and past renegotiations. Conflict resolution appears as a significant design feature for determining treaty stability, aided by asymmetrical basin configurations and bilateralism. The absence of conflict resolution is the main trigger for gradual change. The presence of a duration clause and a history of interstate militarized disputes are found to trigger abrupt change. Renegotiations become more likely after the first round of renegotiation, suggesting a temporal effect of path dependence on treaty evolution. This study adds to the work of scholars mapping transboundary basins at risk and provides further arguments to negotiate better and more specific treaties from the start, which include conflict resolution features that enable dialogue and rule modification while avoiding the need for formal treaty renegotiation.
Abstract Water volume estimates of shallow desert lakes are the basis for water balance calculations, important both for water resource management and paleohydrology/climatology. Water volumes are typically inferred from bathymetry mapping; however, being shallow, ephemeral and remote, bathymetric surveys are scarce in such lakes. We propose a new, remote-sensing based, method to derive the bathymetry of such lakes using the relation between water occurrence, during \textgreater30-yr of optical satellite data, and accurate elevation measurements from the new Ice, Cloud, and Land Elevation Satellite-2 (ICESat-2). We demonstrate our method at three locations where we map bathymetries with \~0.3 m error. This method complements other remotely sensed, bathymetry-mapping methods as it can be applied to: (a) complex lake systems with sub-basins, (b) remote lakes with no in-situ records, and (c) flooded lakes. The proposed method can be easily implemented in other shallow lakes as it builds on publically accessible global data sets.
Typically, humans place themselves at a preferred distance from others. This distance is known to characterize human spatial behavior. Here, we focused on neurocognitive conditions that may affect interpersonal distances. The current study investigated whether neurocognitive deficiencies in numerical and spatial knowledge may affect social perception and modulate personal space.
Phytochromes are biological photoreceptors found in all kingdoms of life. Numerous physicochemical and spectroscopic studies of phytochromes have been carried out for many decades, both experimentally and computationally, with the main focus on the photoconversion mechanism involving a tetrapyrrole chromophore. In this computational work, we concentrate on the long-scale dynamic motion of the photosensory domain of Deinococcus radiodurans by means of classical all-atom molecular dynamics (MD) simulations. Conventional and accelerated MD methods in combination with two different force fields, CHARMM27 and AMBER ff14SB, are tested in long atomistic simulations to confront the dynamics of monomer and dimer forms. These calculations highlight dissimilar equilibrium conformations in aqueous solutions and, in turn, different large-scale dynamic behaviors of the monomer form vs the dimer form. While the phytochrome in a monomer form tends to close the cavity entailed between the GAF and PHY domains, the opposite trend is predicted for the phytochrome dimer, which opens up as a consequence of the formation of strong salt bridges between the PHY domains of two molecules in water.Phytochromes are biological photoreceptors found in all kingdoms of life. Numerous physicochemical and spectroscopic studies of phytochromes have been carried out for many decades, both experimentally and computationally, with the main focus on the photoconversion mechanism involving a tetrapyrrole chromophore. In this computational work, we concentrate on the long-scale dynamic motion of the photosensory domain of Deinococcus radiodurans by means of classical all-atom molecular dynamics (MD) simulations. Conventional and accelerated MD methods in combination with two different force fields, CHARMM27 and AMBER ff14SB, are tested in long atomistic simulations to confront the dynamics of monomer and dimer forms. These calculations highlight dissimilar equilibrium conformations in aqueous solutions and, in turn, different large-scale dynamic behaviors of the monomer form vs the dimer form. While the phytochrome in a monomer form tends to close the cavity entailed between the GAF and PHY domains, the opposite trend is predicted for the phytochrome dimer, which opens up as a consequence of the formation of strong salt bridges between the PHY domains of two molecules in water.
This paper explores the dynamics of (dis)trust among experts, journalists, and audiences through the case study of an inaccurate exit poll aired on a leading Israeli television channel. It combines empirical data from the Israeli April 2019 elections with a conceptual view of exit polls as both sources of information and national rituals to address public discourse on the polls and its underlying suspicions. A multi-method approach yielded a corpus consisting of focus groups meetings with citizens, in-depth semi-structured interviews with journalists, pollsters and experts, and qualitative textual analysis of news reports. Using inductive-qualitative analysis, we identified three types of public narratives, each casting blame for the erroneous exit poll projection on a different type of actor. The statistical and biased-media narratives tally with declining trust in the news media and assume misbehavior by pollsters and news creators respectively. The deception narrative, on the other hand, suggests that right-wing voters systematically sabotaged the exit poll projections. By extending trust beyond journalistic information, this narrative foregrounds the cultural meaning of election night rituals. Taken together, the narratives found in this study delineate (dis)trust as an interplay of active participants in the creation, reception, and interpretation of news. Our findings thus touch upon key attitudes towards both media and democracy and have implications for further studies on collective rituals and information evaluations in an era of eroding trust.
This paper explores the dynamics of (dis)trust among experts, journalists, and audiences through the case study of an inaccurate exit poll aired on a leading Israeli television channel. It combines empirical data from the Israeli April 2019 elections with a conceptual view of exit polls as both sources of information and national rituals to address public discourse on the polls and its underlying suspicions. A multi-method approach yielded a corpus consisting of focus groups with citizens, in-depth semi-structured interviews with journalists, pollsters and experts, and qualitative textual analysis of news reports. Using inductive-qualitative analysis, we identified three types of public narratives, each casting blame for the erroneous exit poll projection on a different type of actor. The statistical and biased-media narratives tally with declining trust in the news media and assume misbehavior by pollsters and news creators respectively. The deception narrative, on the other hand, suggests that right-wing voters systematically sabotaged the exit poll projections. By extending trust beyond journalistic information, this narrative foregrounds the cultural meaning of election night rituals. Taken together, the narratives found in this study delineate (dis)trust as an interplay of active participants in the creation, reception, and interpretation of news. Our findings thus touch upon key attitudes towards both media and democracy and have implications for further studies on collective rituals and information evaluations in an era of eroding trust.
Flood-fed aquifers along the sandy lower reach of the Kuiseb River sustain a 130-km-long green belt of lush oases across the hyperarid Namib desert. This oasis is a year-round source for water creating dense-tall woodland along the narrow corridor of the ephemeral river valley, which, in turn, supports human activity and fauna including during the long dry austral winters and multi-year droughts. Occasional floods, originating at the river's wetter headwaters, travel ∼280 km downstream, before recharging these aquifers. We analyzed the flood-aquifer-vegetation dynamics at-a-site and along the river, determining the relative impact of floods with diverse magnitude and frequency on downstream reaches. We find that flood discharge that feeds the alluvial aquifers also affects vegetation dynamics along the river. The downstream aquifers are fed only by the largest floods that allow the infrequent germination of plants; mean annual recharge volume is too low to support the aquifers level. These short-term vegetation cycles of green-up and then fast senescence in-between floods are easily detected by satellite-derived vegetation index. This index identifies historical floods and their magnitudes in arid and hyperarid regions; specifically, it determines occurrences of large floods in headwater-fed, ephemeral Namib streams as well as in other hyperarid regions. Our study reveals the importance of flood properties on the oasis life cycle, emphasizing the impact of drought and wet years on the Namib's riparian vegetation.
