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Trends in mean growth and stability in temperate vertebrate populations

Considerable controversy exists over the nature of the “Biodiversity Crisis.” While some studies suggest declining diversity, others suggest no loss on average. Population declines necessarily precede species loss and may therefore be a more sensitive metric. We examine trends in abundances to test the hypotheses: (1) losses are experienced disproportionately by some taxa, in particular amphibians; (2) positive trends in alien or unexploited species mask declines in native or exploited species, respectively; (3) populations are becoming more unstable, and variances of within‐population growth rates are increasing.