Limited impacts of experimental flow releases on water quality and macroinvertebrate community composition in an upland regulated river

River regulation following the construction of dams has affected the hydrology, water quality, and biology of watercourses across the globe. The term “environmental flows” has been used to describe measures that can be employed to return some lost elements of the natural flow regime. Their introduction has been suggested as a way to mitigate the impacts of river regulation throughout the world, but understanding of the effects of artificial high flows on water quality and biota is limited for many different river types. We report a field study that manipulated compensation flows from reservoirs in the Pennine uplands of northern England and measured changes in water quality and benthic macroinvertebrates using a before‐after‐control‐impact approach. These resulted in minor short‐term changes in water quality, but there was no evidence of immediate (within 48 hr) responses by the macroinvertebrate community to individual flow releases. However, a shift in macroinvertebrate community composition was found after multiple releases, characterized by reductions in Amphinemura sulcicollis (Plecoptera) and Baetis rhodani (Ephemeroptera) and changes in the density of all Diptera. The introduction of short‐term flow pulses in flashy regulated river systems is unlikely to yield significant changes in water quality and biota. Nevertheless, cumulative rather than single environmental flow events show promise for mitigating some of the impacts of river regulation. More widely, our findings indicate that environmental flow releases from reservoirs may have to go beyond occasional experimental high flow releases if these rivers are to more closely mimic unregulated river systems

Sociologists and "the Japanese model": a passing enthusiasm?

This article critiques the construction of `the Japanese model' of employment relations by sociologists in English language sociological research monographs, organization textbooks and introductory general textbooks. It demonstrates how marked differences emerged across the different genres and relates them to the different purposes of researchers and textbook writers.The article examines three particular puzzles. First, why did general textbooks adopt `the Japanese model' in the 1990s when media commentaries were announcing the demise of the Japanese model in Japan? Second, why did the 1990s textbooks use 1980s organization textbooks rather than research monographs for their sources? Third, why are general textbooks ready to distance themselves from the model in 2006 when researchers confirm continuing vitality in the Japanese model in large Japanese companies? Answering these questions reveals how sociological knowledge of Japanese employment has been generated, disseminated and used in research, teaching and policy debates