THE MONARCH BUTTERFLY FALLS INTO EXTINCTION.

 


The migratory monarch butterfly (Danaus plexippus plexippus), known for its spectacular annual journey of up to 4,000 kilometres across the Americas, has entered the IUCN Red List of Threatened SpeciesTM as Endangered, threatened by habitat destruction and climate change. All surviving sturgeon species – also migratory, found across the northern hemisphere – are now at risk of extinction due to dams and poaching, pushing the world’s most Critically Endangered group of animals yet closer to the brink. Yet these Monarch butterflies, once a familiar sight, are plummeting toward extinction due to landscape-scale threats from pesticides, development and climate change. That's why the Center is working hard to win them protection under the U.S. Endangered Species Act. Monarchs have declined 85% in two decades.

Species categorized as Endangered (EN).

The methods for calculating the global RLI are described in Butchart et al. 2007 and here, with the methods for calculating confidence intervals to reflect uncertainty (including that introduced by Data Deficient species) and the methods for aggregating the RLI across multiple taxonomic groups described Butchart et al. 2010. The R code for calculating and plotting thematic, regional and national RLIs is available from a Code Repository. The IUCN and the Red List Partnership are actively working to expand the taxonomic coverage of the Red List Index (RLI) (in particular for plants and invertebrates) and its representivity in marine and freshwater ecosystems, and have set out an ambitious strategy to achieve this. As a contribution towards this a sampled approach to Red Listing and the production of RLIs has been developed for taxonomic groups with many species, with baseline RLI values available for reptiles, dragonflies, fishes, monocot plants, dicot plants, ferns and their relatives, and mosses.



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