Erica Bakker’s paper is now out in Freshwater Biology! Erica measured N fixation in cyanobacteria with and without midge symbionts and compared those rates to fixation rates in sediment heterotrophs. She found that the rates were comparable between all 3 groups despite assumptions that cyanobacteria are the dominant aquatic N fixers. Interestingly, she also found that the acetylene reduction assay grossly underestimated fixation, compared to direct measurements with 15N2.