How many Data Deficient amphibians are threatened?  IUCN Red List assessments for amphibian species previously classed as Data Deficient

AUTHORS HABEEBAH R. ISA; BENJAMIN TAPLEY; CHRISTOPHER J. MICHAELS
ABSTRACT At the time of our research in 2022; 16.4% of amphibian species on the IUCN Red List were assessed as Data Deficient (DD). There is minimal funding allocated to the research; reassessment of DD taxa; this prevents them from being prioritised for conservation. We identified 656 non-DD amphibian species that were previously assessed as DD; used their subsequent assessment trajectories to predict the extinction risk of remaining DD taxa. Assuming similarity of the distribution of these taxa between extinction risk categories to those of currently DD species; we compared this dataset with the risk category distribution of assessed amphibians that had never been assessed as DD. Previously DD amphibians; when compared to those that were never DD; were found to be more threatened (52.1% vs. 39.6%); less likely to be non-threatened (22.4% vs. 60.0%). When explored further at the level of Order; more previously DD amphibians in the Order Gymnophiona were reassessed as ‘Near Threatened’; more Caudata ‘Critically Endangered’ with fewer ‘Least Concern’; and more Anura ‘Vulnerable’; ‘Endangered’ with fewer ‘Least Concern’ than counterparts that were never assessed as DD. Based on these previously-DD amphibian data; we estimated that around half (49.6%; n = 592) of currently DD amphibians are likely threatened by extinction. Our approach arrives at similar conclusions to authors using other approaches; bolsters the argument that conservationists; funding organisations should implement recommendations to address concerns for DD amphibians; especially DD Caudata.

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AUTHORS: HABEEBAH R. ISA, BENJAMIN TAPLEY & CHRISTOPHER J. MICHAELS

ABSTRACT: At the time of our research in 2022, 16.4% of amphibian species on the IUCN Red List were assessed as Data Deficient (DD). There is minimal funding allocated to the research and reassessment of DD taxa, this prevents them from being prioritised for conservation. We identified 656 non-DD amphibian species that were previously assessed as DD and used their subsequent assessment trajectories to predict the extinction risk of remaining DD taxa. Assuming similarity of the distribution of these taxa between extinction risk categories to those of currently DD species, we compared this dataset with the risk category distribution of assessed amphibians that had never been assessed as DD. Previously DD amphibians, when compared to those that were never DD, were found to be more threatened (52.1% vs. 39.6%) and less likely to be non-threatened (22.4% vs. 60.0%). When explored further at the level of Order, more previously DD amphibians in the Order Gymnophiona were reassessed as ‘Near Threatened’, more Caudata ‘Critically Endangered’ with fewer ‘Least Concern’, and more Anura ‘Vulnerable’ and ‘Endangered’ with fewer ‘Least Concern’ than counterparts that were never assessed as DD. Based on these previously-DD amphibian data, we estimated that around half (49.6%, n = 592) of currently DD amphibians are likely threatened by extinction. Our approach arrives at similar conclusions to authors using other approaches and bolsters the argument that conservationists and funding organisations should implement recommendations to address concerns for DD amphibians, especially DD Caudata.