Suchergebnisse

The destruction and transformation of ecosystems by humans threatens biodiversity, ecosystem function, and vital ecosystem services. Ecological repair of ecosystems will be a major challenge over the next century and beyond. Restoration efforts to date have frequently been ad hoc, and site or situation specific. Although such small-scale efforts are vitally important, without large-scale visions and coordination, it is unlikely that large functioning ecosystems will ever be constructed by chance through the cumulative effects of small-scale projects. Although the problems of human-induced environmental degradation and the need for a solution are widely recognized, these issues have rarely been addressed on a sufficiently large-scale basis. There are numerous barriers that prevent large-scale ecological restoration projects from being proposed, initiated, or carried through. Common barriers include the "shifting baseline syndrome," the scale and complexity of restoration, the long-term and open-ended nature of restoration, funding challenges, and preemptive constraint of vision. Two potentially useful approaches that could help overcome these barriers are stretch goals and backcasting. Stretch goals are ambitious long-term goals used to inspire creativity and innovation to achieve outcomes that currently seem impossible. Backcasting is a technique where a desired end point is visualized, and then a pathway to that end point is worked out retrospectively. A case study from the Scottish Highlands is used to illustrate how stretch goals and backcasting could facilitate large-scale restoration. The combination of these approaches offers ways to evaluate and shape options for the future of ecosystems, rather than accepting that future ecosystems are victims of past and present political realities.

A spatially nested experimental design was used to survey reptiles in a sheep- and cattle-grazing landscape in southern New South Wales, Australia. Sixteen landscape units were chosen on the basis of their aspect, topography and amount of tree cover. Across these landscape units, 288 pitfall traps were established at 144 plots arranged in 48 sites. Each plot was searched for reptiles and pitfall-trapped in two separate survey periods. The four-fingered skink (Carlia tetradactyla) was the most commonly encountered reptile species, and detailed statistical habitat models were constructed for this species. The four-fingered skink responded to both landscape scale and microhabitat variables. The species was more likely to be detected in landscape units characterised by a high amount of tree cover. Adults were most likely to inhabit microhabitats dominated by box- or gum-type eucalypts, with a moderate amount of canopy cover and with a large number of spiders. Juveniles were most likely to inhabit microhabitats with a moderate amount of weed invasion where shrubs were present. Finally, the four-fingered skink was more likely to be found at sites with at least two other co-occurring small reptile species. Body condition and tail loss of adult skinks were not related to the habitat or microhabitat where a given individual was found. The results are discussed in relation to current herpetological research, and some long-term conservation implications are highlighted.

The destruction and transformation of ecosystems by humans threatens biodiversity, ecosystem function, and vital ecosystem services. Ecological repair of ecosystems will be a major challenge over the next century and beyond. Restoration efforts to date have frequently been ad hoc, and site or situation specific. Although such small-scale efforts are vitally important, without large-scale visions and coordination, it is unlikely that large functioning ecosystems will ever be constructed by chance through the cumulative effects of small-scale projects. Although the problems of human-induced environmental degradation and the need for a solution are widely recognized, these issues have rarely been addressed on a sufficiently large-scale basis. There are numerous barriers that prevent large-scale ecological restoration projects from being proposed, initiated, or carried through. Common barriers include the "shifting baseline syndrome," the scale and complexity of restoration, the long-term and open-ended nature of restoration, funding challenges, and preemptive constraint of vision. Two potentially useful approaches that could help overcome these barriers are stretch goals and backcasting. Stretch goals are ambitious long-term goals used to inspire creativity and innovation to achieve outcomes that currently seem impossible. Backcasting is a technique where a desired end point is visualized, and then a pathway to that end point is worked out retrospectively. A case study from the Scottish Highlands is used to illustrate how stretch goals and backcasting could facilitate large-scale restoration. The combination of these approaches offers ways to evaluate and shape options for the future of ecosystems, rather than accepting that future ecosystems are victims of past and present political realities.

Sustainability issues cannot be separated from their social and biophysical context, and collaborative governance responses to interdependent sustainability issues are inherently complex. Governance gaps emerge when responsible actors fail to recognize how multiple issues and actors are interlinked. Closing governance gaps is particularly challenging for sustainability issues that intersect several sectors of society, such as livelihoods, agriculture and biodiversity conservation. This study introduces a new quantitative empirical approach that conceptualizes how governance gaps emerge at the intersection of two networks that are usually studied separately: an actor network and a network of interdependent sustainability issues. We differentiate between (1) integrative gaps that arise when interdependent issues are managed in separation without recognizing their interdependencies, versus (2) collaborative gaps that arise when actors working on common issues do not collaborate. Using data on 60 actors and 38 sustainability issues in southwest Ethiopia, we found comprehensive collaboration networks around, for example, agricultural production and land-use issues, but large collaborative gaps for forest and wildlife issues. While actors actively managed interdependencies around national high-priority issues such as coffee export and family planning, integrative gaps were common for low-profile issues such as access provision of finance, transportation, schools, food and crop markets. In general, smaller specialized actors had a stronger tendency than larger generalist actors to focus their management capacity towards the closing of governance gaps. Surprisingly, greater system complexity did not per se cause governance gaps, except when system interactions were cross-sectoral. Furthermore, our data suggested that integrative system management and collaboration reinforced each other. In conclusion, our network framework advances how governance gaps can be understood and prioritized in different empirical contexts. It ...