Establishing IUCN Red List Criteria for Threatened Ecosystems

The potential for conservation of individual species has been greatly advanced by the International Union for Conservation of Nature\u27s (IUCN) development of objective, repeatable, and transparent criteria for assessing extinction risk that explicitly separate risk assessment from priority setting. At the IV World Conservation Congress in 2008, the process began to develop and implement comparable global standards for ecosystems. A working group established by the IUCN has begun formulating a system of quantitative categories and criteria, analogous to those used for species, for assigning levels of threat to ecosystems at local, regional, and global levels. A final system will require definitions of ecosystems; quantification of ecosystem status; identification of the stages of degradation and loss of ecosystems; proxy measures of risk (criteria); classification thresholds for these criteria; and standardized methods for performing assessments. The system will need to reflect the degree and rate of change in an ecosystem\u27s extent, composition, structure, and function, and have its conceptual roots in ecological theory and empirical research. On the basis of these requirements and the hypothesis that ecosystem risk is a function of the risk of its component species, we propose a set of four criteria: recent declines in distribution or ecological function, historical total loss in distribution or ecological function, small distribution combined with decline, or very small distribution. Most work has focused on terrestrial ecosystems, but comparable thresholds and criteria for freshwater and marine ecosystems are also needed. These are the first steps in an international consultation process that will lead to a unified proposal to be presented at the next World Conservation Congress in 2012

South Africa

South Africa has the second longest coastline on the African continent and spans two oceans. The confluence of the Benguela and Agulhas Currents off South Africa results in their dynamics being complex and often unpredictable, although it is these dynamic ocean systems that contribute to the high biodiversity and productivity of the South African coastal and marine ecosystems. There are 136 different habitat types ranging from subtropical coral reefs and mangroves on the north-east coast to temperate kelp forests and seamounts on the south and western coast. These habitats are under pressure from climate change as well as direct human impacts. Climate change is expected to influence the dynamic nature of the ocean systems through alterations of the currents, sea-level rise and increased water temperatures, ocean acidification, and storm events. Human activities such as fishing, overexploitation of marine resources, and coastal development have placed great pressures on marine and coastal habitats, biodiversity, and resources. Future threats include increased offshore mining activities in habitats that are not well studied or protected. Marine protection and management is achieved through the overarching National Environmental Management and Integrated Coastal Management Acts, which make provision for setting up marine protected areas (MPAs) and protection of individual species. Operation Phakisa is an exciting new initiative that has the potential to address the human resources capacity shortages, research requirements, and governance issues identified in this chapte