Ecosystems-based adaptation: Are we being conned? Evidence from Mexico

This paper scrutinises claims made about the promise and efficacy of ecosystems-based adaptation (EBA), through an exploration of EBA-relevant interventions in two fieldsites in Mexico. Our data starts to fill important gaps in current global debates about EBA. We find evidence of the important contribution of interventions relevant to EBA objectives at a small scale and under very specific conditions. However, the viability of similar interventions is substantially reduced, and arguably rendered null, as an incentive for conservation in a more populous fieldsites. Furthermore, evidence suggests that other adaptation options risked being overlooked if the context were viewed solely through the lens of EBA. We conclude that EBA needs to: a) engage with and address the trade-offs which characterised earlier attempts to integrate conservation and development, and; b) acknowledge the implications for its objectives of a globally predominant, neoliberal political economy

An assessment of the risk of Bt-cowpea to non-target organisms in West Africa

Cowpea (Vigna unguiculata Walp.) is the most economically important legume crop in arid regions of sub-Saharan Africa. Cowpea is grown primarily by subsistence farmers who consume the leaves, pods and grain on farm or sell grain in local markets. Processed cowpea foods such as akara (a deep-fat fried fritter) are popular in the rapidly expanding urban areas. Demand far exceeds production due, in part, to a variety of insect pests including, in particular, the lepidopteran legume pod borer (LPB) Maruca vitrata. Genetically engineered Bt-cowpea, based on cry1Ab (Event 709) and cry2Ab transgenes, is being developed for use in sub-Saharan Africa to address losses from the LBP. Before environmental release of transgenic cowpeas, the Bt Cry proteins they express need to be assessed for potential effects on non-target organisms, particularly arthropods. Presented here is an assessment of the potential effects of those Cry proteins expressed in cowpea for control of LPB. Based on the history of safe use of Bt proteins, as well as the fauna associated with cultivated and wild cowpea in sub-Saharan Africa results indicate negligible effects on non-target organisms

Scenarios of large mammal loss in Europe for the 21st century

Distributions and populations of large mammals are declining globally, leading to an increase intheir extinction risk. We forecasted the distribution of extant European large mammals (17 carnivores and10 ungulates) based on 2 Rio+20 scenarios of socioeconomic development: business as usual and reducedimpact through changes in human consumption of natural resources. These scenarios are linked to scenariosof land-use change and climate change through the spatial allocation of land conversion up to 2050. We useda hierarchical framework to forecast the extent and distribution of mammal habitat based on species’ habitatpreferences (as described in the International Union for Conservation of Nature Red List database) withina suitable climatic space fitted to the species’ current geographic range. We analyzed the geographic andtaxonomic variation of habitat loss for large mammals and the potential effect of the reduced impact policyon loss mitigation. Averaging across scenarios, European large mammals were predicted to lose 10% of theirhabitat by 2050 (25% in the worst-case scenario). Predicted loss was much higher for species in northwesternEurope, where habitat is expected to be lost due to climate and land-use change. Change in human consumptionpatterns was predicted to substantially improve the conservation of habitat for European large mammals,but not enough to reduce extinction risk if species cannot adapt locally to climate change or disperse

Population and geographic range dynamics: implications for conservation planning

Continuing downward trends in the population sizes of many species, in the conservation status of threatened species, and in the quality, extent and connectedness of habitats are of increasing concern. Identifying the attributes of declining populations will help predict how biodiversity will be impacted and guide conservation actions. However, the drivers of biodiversity declines have changed over time and average trends in abundance or distributional change hide significant variation among species. While some populations are declining rapidly, the majority remain relatively stable and others are increasing. Here we dissect out some of the changing drivers of population and geographic range change, and identify biological and geographical correlates of winners and losers in two large datasets covering local population sizes of vertebrates since 1970 and the distributions of Galliform birds over the last two centuries. We find weak evidence for ecological and biological traits being predictors of local decline in range or abundance, but stronger evidence for the role of local anthropogenic threats and environmental change. An improved understanding of the dynamics of threat processes and how they may affect different species will help to guide better conservation planning in a continuously changing world