Assessing conservation status and trends for the world’s butterflies: the Sampled Red List Index approach

Red List Indices provide a method for assessing global trends in species’ conservation status, and for monitoring progress towards achieving conservation targets (for example, commitments under the Convention on Biological Diversity). Red List Indices are based on categorization of taxa in terms of their threat status using information on, for example, current and projected abundances, distributions, and threats. Global assessments have now been...