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Abstract
BackgroundThe IUCN Red List of Threatened Species is the most widely used information source on the extinction risk of species. One of the uses of the Red List is to evaluate and monitor the state of biodiversity and a possible approach for this purpose is the Red List Index (RLI). For many taxa, mainly hyperdiverse groups, it is not possible within available resources to assess all known species. In such cases, a random sample of species might be selected for assessment and the results derived from it extrapolated for the entire group - the Sampled Red List Index (SRLI). The current contribution is the final in four papers that will constitute the baseline of a future spider SRLI encompassing 200 species distributed across the world.New informationA sample of 200 species of spiders were randomly selected from the World Spider Catalogue, an updated global database containing all recognised species names for the group. The selected species were classified taxonomically at the family level and the familes were ordered alphabetically. In this publication, we present the conservation profiles of 50 species belonging to the families alphabetically arranged between Scytodidae and Zoropsidae, which encompassed Scytodidae, Selenopidae, Sicariidae, Sparassidae, Tetrablemmidae, Tetragnathidae, Theraphosidae, Theridiidae, Theridiosomatidae, Thomisidae, Trochanteriidae, Zodariidae and Zoropsidae.
Highlights
The IUCN Red List of Threatened Species is the most widely used information source on the extinction risk of species (Lamoreux et al 2003, Rodrigues et al 2006, Mace et al 2008 but see Cardoso et al 2011b, Cardoso et al 2012)
A random sample of species might be selected for assessment and the results derived from it extrapolated for the entire group - the Sampled Red List Index (SRLI)
For the remaining 137 species, the habitat quality trend could not be inferred and was classified as unknown (Fig. 3). This exercise provides a first glimpse into the general trends in the conservation status of spiders around the world
Summary
The IUCN Red List of Threatened Species is the most widely used information source on the extinction risk of species (Lamoreux et al 2003, Rodrigues et al 2006, Mace et al 2008 but see Cardoso et al 2011b, Cardoso et al 2012). It is based on a number of objective criteria, which are relatively easy to apply when adequate information is available (IUCN 2001).
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