Adaptive Management of Riverine Socio-ecological Systems

If ongoing change in ecosystems and society can render inflexible policies obsolete, then management must dynamically adapt as a counter to perennial uncertainty. This chapter describes a general synthesis of how to make decision-making more adaptive and then explores the barriers to learning in management. We then describe how one such process, known as adaptive management (AM), has been applied in different river basins, on which basis we discuss AM’s strengths and limitations in various resource management contexts

Identification of a new European rabbit IgA with a serine-rich hinge region

<div><p>In mammals, the most striking IgA system belongs to Lagomorpha. Indeed, 14 IgA subclasses have been identified in European rabbits, 11 of which are expressed. In contrast, most other mammals have only one IgA, or in the case of hominoids, two IgA subclasses. Characteristic features of the mammalian IgA subclasses are the length and amino acid sequence of their hinge regions, which are often rich in Pro, Ser and Thr residues and may also carry Cys residues. Here, we describe a new IgA that was expressed in New Zealand White domestic rabbits of <i>IGHV</i>a1 allotype. This IgA has an extended hinge region containing an intriguing stretch of nine consecutive Ser residues and no Pro or Thr residues, a motif exclusive to this new rabbit IgA. Considering the amino acid properties, this hinge motif may present some advantage over the common IgA hinge by affording novel functional capabilities. We also sequenced for the first time the IgA14 CH2 and CH3 domains and showed that IgA14 and IgA3 are expressed.</p></div

Groundwater-surface water interactions and phosphorus biogeochemistry in river floodplains

In many European lowland rivers, floodplains have been disconnected from adjacent channel systems. Consequently, the groundwater – surface water interface is largely restricted to near bed and bank sediments. However, if the river-floodplain system remains hydrologically connected, then the groundwater – surface water mixing zone may extend for hundreds of metres away from the main channel and into the floodplain. Biogeochemical processes, coupled with advective water and solute transport, indicate that floodplain groundwater may exert a strong control on surface water chemical quality. We examined the processes controlling the release of soluble phosphorus to floodplain groundwater, and the subsequent export of phosphorus from the floodplain to the river channel.We show that the release of phosphorus in submerged floodplain sediments is controlled by redox thresholds. The reductive-dissolution of phosphorus complexed at the surface of ferric hydroxide in these sediments can lead to a rapid and sustained release of phosphorus to solution. Concentrations of phosphorus in groundwater and surface water can reach several milligrams per litre. The form of phosphorus released is dominated by the readily bioavailable orthophosphate ion, indicating a potential for rapid uptake by bacteria and algae. Our research indicates that the timing of phosphorus release is inversely related to the nitrate-nitrogen concentration in river water, posing significant challenges to the integrated management of floodplains for multi-nutrient attenuation. Further hydrological and hydrochemical data show that advective transport in groundwater can export phosphorus from the floodplain to adjacent surface water bodies

Evaluating the quality of hydraulic conductivity estimates from piezometer slug tests in peat.

Although widely used in wetland hydrological studies, hydraulic conductivity (K) estimates from piezometer slug tests are often of questionable validity. Frequently, this is because insufficient attention is paid to the details of the test procedure. Further, in a potentially heterogeneous and anisotropic medium such as peat, the use of slug tests is prone to error. In this paper we address some of the methodological issues surrounding piezometer slug tests in peat. We compare slug test data with laboratory determinations of vertical and horizontal K obtained using a new method. Piezometers were installed at three depths in a floodplain fen peat in Norfolk, UK. Slug tests were initiated by both slug insertion and slug withdrawal, and repeat tests were conducted to examine the robustness of our K estimates. Most of the tests displayed departures from the log-linear model of Hvorslev, the form of departure being consistent with compressible soil behaviour. The results suggest that insertion tests gave similar results to those initiated by withdrawal. Repeat testing showed that withdrawal data, in particular, gave highly reproducible normalized responses that were independent of the initial head. Values for K estimated using the slug tests were in the range 1 × 10−4 to 1·6 × 10−3 cm s−1, which is towards the upper end of the range reported for peats generally. Laboratory tests yielded similar values of K to those obtained from the slug tests. Although the laboratory tests showed that the peat was anisotropic, the K values generated by slug testing proved relatively good estimates of both vertical and horizontal K

Democratic Deficit or the Europeanisation of Secession? Explaining the Devolution Referendums in Scotland

This article deals with the variation in the demand for self-government in Scotland – as measured by the vote in the two referendums – between 1979, when devolution was rejected, and 1997, when devolution was endorsed. The existing literature mainly deals with each of the two referendums in isolation and does not offer an explicitly comparative analysis of them. However, implicit comparisons contained in analyses of the 1997 referendum tend to identify as the main cause of the variation the 'democratic deficit' created by Conservative rule between 1979 and 1997, which was consistently rejected in Scotland. I take issue with this explanation on theoretical and empirical grounds and advances an alternative account grounded in an explicit comparison of the two referendums. Based on a rationalist approach, the analysis presented here identifies three key elements in the voting dynamics at the two points in time – a gap between support for self-government and the actual vote in the referendum; an interaction effect between attitudes to devolution and to independence; and the role of the European context in shaping perceptions of independence. I argue that significant change in these three variables (rather than a 'democratic deficit') appear to have been the most important determinants of the different results of the two referendums