For those (few?) of you who are marine benthic ecologists, you may be familiar with the size-fractionated abundance-to-biomass conversion equations proposed by Graham Edgar for benthic/epifaunal invertebrates. Basically, he derived a general equation relating epifaunal abundance to biomass (in mg AFDM), and biomass to rates of secondary production (in ug AFDM per day). For those of you working with small benthic invertebrates, these equations can cut out a lot of work in having to ash each species, with the added benefit of being able to preserve and retain all specimens. However, it can be a tad unwieldy to implement, unless of course, you’re dealing with R!