Tag Archives: errors

Polar bear numbers, margins of error, & consequences for conservation status

Large margins of error in polar bear population estimates means the conservation status threshold of a 30% decline (real or predicted) used by the US Endangered Species Act and the IUCN Red List is probably not valid for this species.

Polar_Bear_Biologist_USFWS_working_with_a_Bear_Oct 24 2001 Amstrup photo

Several recent subpopulation estimates have shown an increase between one estimate and another of greater than 30% yet deemed not to be statistically significant due to large margins of error. How can such estimates be used to assess whether population numbers have declined enough to warrant IUCN Red List or ESA protection?

What do polar bear population numbers mean for conservation status, if anything?

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Correction notice for Harvey et al. BioScience paper retracted due to error

You just have to laugh: the promised miniscule changes were finally made to the embarrassing Harvey et al. 2018 BioScience paper last week but today were retracted.

Retraction Watch headline 3 April 2018

The corrigendum was erroneously published 28 March 2018 at the journal Neurosurgery. And that blunder attracted the attention of the folks at Retraction Watch.

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