The importance of periodic droughts for maintaining diversity in the freshwater environment

Whereas some species may rely on periodic drought conditions for part of their life histories, or have life strategies suited to exploiting the habitat or changed environmental conditions that are created by drought, for other organisms it is a time of stress. Periodic drought conditions therefore generate a series of waves of colonization and extinctions. Studies on lowland wet grassland, in winterbournes and in the toiche zone of both ponds and rivers, also demonstrate that different organisms are competitively favoured with changing hydrological conditions, and that this process prevents any one species from overwhelming its competitors. Competitive impacts may be inter- and intraspecific. It is therefore apparent that the death of organisms such as adult fish during severe drought conditions, though traumatic for human onlookers and commercial interests, may be merely a regular occurrence to which the ecosystem is adapted. The variability of climatic conditions thereby provides a direct influence on the maintenance of biological diversity, and it is this very biodiversity that provides the ecosystem with the resilience to respond to environmental changes in both the short and the longer term

Water quality objectives as a management tool for sustainability

The aim of this paper is to explore the potential role that quality objectives, particularly when backed by statutory force, may play in the sustainable management of river water quality. Economic valuation techniques are discussed, as well as the theory of "critical natural capital". A brief history of water quality legislation includes the implementation of the National Water Council classification in 1979, and the statutory water quality objectives introduced under the Water Resources Act 1991

Aquatic ecology, economy and society: the place of aquatic ecology in the sustainability agenda

This article explores aspects of sustainability and the importance of sustainable development, including the place of the crucially important resource of fresh water and of freshwater ecosystems. It examines the treatment of natural resources by the economic system that underpins global business, outlines some progress towards more sustainable approaches to business, and recommends steps to re-establish science as the driver of wise policies that contribute to sustainable development

Investing in our rivers

This article makes the case for investment in the natural infrastructure of rivers, highlighting the societal benefits that would flow from it yet their substantial externalisation from current economic thinking with associated deterioration of social and economic opportunit

Rebirthing the landscape

An account of the community-based groundwater recharge activities of the NGO Tarun Bharat Sangh in semi-arid north Rajastha

The converging world: The social and environmental impact of convergence

This 96-page report undertakes an ecosystem service analysis of SROI (social report on investment from linked investment in renewable energy and forest restoration in Tamil Nadu, India, as a strategic approach to low-carbon development in an international partnership between south west England and India

The pros and cons of the hot summer on our rivers

West Country naturalist and scientist Dr Mark Everard looks at the effects on our rivers of the UK’s hot, dry summe

Community-based groundwater and ecosystem restoration in semi-arid north Rajasthan (1): Socio-economic progress and lessons for groundwater-dependentareas

Groundwater is a vital resource in arid and semi-arid regions, increasingly relied upon for year-round access, though lack of both study and regulation contribute to unsustainable pressures potentially contributing to a negative spiral of ecological, social and economic decline. Using field visits, interviews with locals and experts, and literature reviews, we explored a successful programme of community-based groundwater recharge in three adjacent catchments (the Arvari, Sarsa and Baghani) in semi-arid north Rajasthan, India, led by the NGO Tarun Bharat Sangh (TBS) in order to determine how successes were achieved and could be replicated. TBS-led initiatives rebuilt traditional village governance structures and participation in community-designed and maintained water harvesting structures (WHSs), which were efficient both economically and in technical design using indigenous knowledge. Enhanced seasonal groundwater recharge enabled by WHSs regenerated aquatic, farmed and natural ecosystems, underpinning a positive cycle of interdependent social and economic regeneration. Locally appropriate, integrated social and technical solutions maintaining this positive cycle have increased the quality of ecosystems and the wellbeing of local people. We used the STEEP (Social, Technological, Economic, Environmental, Political) framework to stratify outcomes, exploring principles underpinning successful local and catchment-scale regeneration and drawing out lessons transferrable to similarly water-stressed regions

Developing payment of ecosystem services mechanisms for Sanjay Gandhi National Park – A revenue generating model

This report details the ecosystems of Sanjay Gandhi National Park, Mumbai, the range of ecosystem services that it provides, and possible PES (Payments for ecosystem services) opportunities