Planning for sustainability at the local government level

While the primary objective of the 1992 Earth Summit was to generate new commitments from national governments on global environmental issues, one of the most tangible outcomes of the summit was to focus international attention on the role of cities as central actors in the Earth's ecosystem. As a result, the recent UN Conference on Human Settlements (Habitat II) extended its focus, originally on housing only, to sustainable human settlements. The final product of the meeting, the Habitat Agenda, provides the greatest recognition ever offered by the United Nations to the role of local governments in the sustainable development process. The success of the Habitat Agenda will be defined by the ability of local governments to effectively adopt its recommendations.This article is a “report from the field” on local adaptations of environmental assessment andplanning procedures in order to implement the various components of the sustainable development mandate.     

Is there a method in our measurement? The use of indicators in local sustainable development planning

'Sustainability indicators' are being used in local communities to serve multiple and sometimes vague or contradictory objectives. This can add to confusion about sustainable development among the public and policy makers. The case of Seattle, USA is used to illustrate how a set of well-developed indicators can fail to meet their objectives if they are unrelated to a methodical planning process. The cases of the State of Oregon, USA and Santa Monica, USA are then presented to demonstrate how indicators can be used effectively in sustainable development planning to measure performance and to promote positive change. The author concludes that, at the local level, indicators are ideally suited for performance measurement. Indicators are a sub-optimal tool for technical assessment and even public education. Applications of indicators for these two purposes can compromise the performance measurement function.     

The dilemma of pest suppression in the conservation of endangered species

In the conservation of endangered species, suppression of a population of one native species to benefit another poses challenges. Examples include predator control and nest parasite reduction. Less obvious is the control of blood-feeding arthropods. We conducted a case study of the effect of native black flies (Simulium spp.) on reintroduced Whooping Cranes (Grus americana). Our intent was to provide a science-driven approach for determining the effects of blood-feeding arthropods on endangered vertebrates and identifying optimal management actions for managers faced with competing objectives. A multiyear experiment demonstrated that black flies reduce nest success in cranes by driving incubating birds off their nests. We used a decision-analytic approach to develop creative management alternatives and evaluate trade-offs among competing objectives. We identified 4 management objectives: establish a self-sustaining crane population, improve crane well-being, maintain native black flies as functional components of the ecosystem, and minimize costs. We next identified potential management alternatives: do nothing, suppress black flies, force crane renesting to occur after the activity period of black flies, relocate releases of cranes, suppress black flies and relocate releases, or force crane renesting and relocate releases. We then developed predictions on constructed scales of 0 (worst-performing alternative) to 1 (best-performing alternative) to indicate how alternative actions performed in terms of management objectives. The optimal action depended on the relative importance of each objective to a decision maker. Only relocating releases was a dominated alternative, indicating that it was not optimal regardless of the relative importance of objectives. A rational decision maker could choose any other management alternative we considered. Recognizing that decisions involve trade-offs that must be weighed by decision makers is crucial to identifying alternatives that best balance multiple management objectives. Given uncertainty about the population dynamics of blood-feeding arthropods, an adaptive management approach could offer substantial benefits.     

Comparing the Community Composition of European and Eastern Chinese Waterbirds and the Influence of Human Factors on the China Waterbird Community

We compared the European and eastern Chinese waterbird assemblages and checked whether the effects of human disturbance could be detected in the assemblages’ composition. For the different Chinese provinces, we expected to find a negative effect of economic development on the mean bird species mass and on the proportion of bentivorous, piscivorous and insectivorous bird species. We also expected to find relatively fewer large species in the Chinese assemblage. Species rank–abundance curves were relatively similar, but China had significantly more species with smaller body masses. The China assemblage was characterized by relatively higher abundance of heavy-bodied species, contrary to our expectations. Mean bird body mass decreased in China with increasing disturbance and increasing gross domestic product (GDP). For coastal provinces in China the percentage of bentivorous, piscivorous and insectivorous bird species declined with increasing GDP, maybe through the increased use of pesticides or fertilizer.