An evaluation and modification of World Conservation Union Red List criteria for classification of extinction risk in vascular plants

Article Abstract:

The World Conservation Union (IUCN) Red List criteria, a group of decision rules based on quantitative thresholds of population size and other factors, have been evaluated through use of data on 68 vascular plant taxa from southeastern Australia. It was found that what the criteria lacked could be overcome with changes that did not greatly change the structure of the rules. Distributional thresholds were made smaller to be appropriate to sessile organisms. Other changes were made, among them including qualitatively defined classes of threatening processes and a rule dealing with numbers of populations. Explicit schemes bring greater accuracy and precision in risk classification and are more easily defended when challenged. They define a strategy for data collection essential for continued assessment and management of threatened species.

Research, Methods, Australia, International aspects, Statistics, Endangered species, Environmental policy, Plant conservation, Biogeography, Plant populations, Ecological surveys, World Conservation Union

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Obstacles to protecting marine biodiversity through marine wilderness preservation: examples from the New England region

Article Abstract:

Biodiversity protection in the US through designation of no-take public wilderness is far greater than no-take protection offered to the nation's National Marine Sanctuary System. Commercial fishing is considered a major threat to marine biodiversity. Although much public support exists for conservation of the marine environment, no permanent reserve is protected from commercial fishing.

Fishing, Fishing (Recreation)

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Indices of grassland biodiversity in the Chihuahuan desert ecoregion derived from remote sensing

Article Abstract:

A simple and direct remote-sensing approach to determine biodiversity values in arid ecosystems to identify potential conservation sites is presented. The results suggest that areas of low-disturbance grasslands with greater nonruderal species abundance, higher litter accumulation, lower shrub encroachment and less exposed soil are good target areas for biodiversity conservation.

Mexico, Grassland ecology, Chihuahuan Desert

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