Corrigendum to "Development of a novel metric for evaluating diatom assemblages in rivers using DNA metabarcoding" [Ecol. Indic. (2020) 106725]. (December 2020) - Kelly, M.G.; Juggins, S.; Mann, D.G.; Sato, S.; Glover, R.; Boonham, N.; Sapp, M.; Lewis, E.; Hany, U.; Kille, P.; Jones, T.; Walsh, K.