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The Antarctic climate-diversity-invasion hypothesis (ACDI) predicts that in Antarctic soil systems, climate change should lead to increases in the abundance and diversity of indigenous assemblages. Where biological invasions have occurred, however, invasive alien species should have negative effects on indigenous faunal assemblages. To assess these predictions, we provide the first systematic ecological survey of the Collembola assemblages of pristine, sub-Antarctic Heard Island (53.1°S, 73.5°E) and compare the results to similarly conducted surveys of three other sub-Antarctic islands (Marion, Prince Edward, and Macquarie), characterised by assemblages including invasive Collembola. In particular, we examine differences in densities of three indigenous species (Cryptopygus antarcticus, Mucrosomia caeca, Tullbergia bisetosa) shared between the invaded islands and Heard Island. On average, density of …