We’ve got a number of papers on different aspects of biodiversity in this issue, amongst these there is an estimate of global seafloor biomass (about 100 megatons), how plankton may form specialised regional sub-species, and how diversity decreases under climatic stress (on this occasion the cooling of the poles). We’ll start, however, with a nice bit of kit that looks quite buildable for anyone wanting to take a look underwater without having to dive…

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