Resilience of Epilithic Algal Assemblages in Atmospherically and Experimentally Acidified Boreal Lakes

摘要: Algal assemblages can be highly responsive to environmental changes in recovering acidified lakes. We compared epilithic algal boreal lakes during chemical recovery from atmospheric (Killarney Park, Ontario) and experimental (Lake 302S, Experimental Lakes Area, acidification assess the impact of spatial temporal scale severe on taxonomic resilience (i.e. rate). Resilience was measured as distance traveled by ordination space pH based canonical correspondence analysis. relatively negligible Killarney lakes, suggesting that eight years Lake 302S had less biological than did decades regional acidification. Increases dissolved organic carbon, inorganic calcium best explained variance species abundances In contrasting trajectories resistance, i.e. displacement reference conditions following a perturbation, indicated ecological factors affecting epilithon differed at corresponding levels Our findings reveal modeling ecosystem must account for delay responses result differences between trajectories.