Responses of benthic algae to nutrient enrichment in a shallow lake: Linking community production, biomass, and composition

• Published in: Freshwater Biology
• Main Authors: McCormick, Amanda R., Phillips, Joseph S., Ives, Anthony R.
• Other Authors: Division of Environmental Biology
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2019
• Subjects: Mývatn; Iceland; Subarctic
• Online Access: http://dx.doi.org/10.1111/fwb.13375; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Ffwb.13375; https://onlinelibrary.wiley.com/doi/pdf/10.1111/fwb.13375; https://onlinelibrary.wiley.com/doi/full-xml/10.1111/fwb.13375; https://onlinelibrary.wiley.com/doi/am-pdf/10.1111/fwb.13375

Abstract Understanding how nutrient limitation affects algal biomass and production is a long‐standing interest in aquatic ecology. Nutrients can influence these whole‐community characteristics through several mechanisms, including shifting community composition. Therefore, incorporating the joint responses of biomass, taxonomic composition, and production of algal communities, and relationships among them, is important for understanding effects of nutrient enrichment. In shallow subarctic Lake Mývatn, Iceland, benthic algae compose a majority of whole‐lake primary production, support high secondary production, and influence nutrient cycling. Given the importance of these ecosystem processes, the factors that limit benthic algae have a large effect on the function and dynamics of the Mývatn system. In a 33‐day nutrient enrichment experiment conducted in Lake Mývatn, we measured the joint responses of benthic algal biomass, primary production, and composition to nitrogen (N) and phosphorus (P) supplementation. We enriched N and P using nutrient‐diffusing agar overlain by sediment, with three levels of N and P that were crossed in a factorial design. We found little evidence of community‐wide nutrient limitation, as chlorophyll‐ a concentrations showed a negligible response to nutrients. Gross primary production ( GPP ) was unaffected by P and inhibited by N enrichment after 10 days, although the inhibitory effect of N diminished by day 33. In contrast to biomass and primary production, community composition was strongly affected by N and marginally affected by P, with some algal groups increasing and others decreasing with enrichment. The taxa with the most negative and positive responses to N enrichment were Fragilariaceae and Scenedesmus , respectively. The abundances of particular algal groups, based on standardised cell counts, were related to GPP measured at the end of the experiment. Oocystis was negatively associated with GPP but was unaffected by N or P, while Fragilariaceae and Scenedesmus were ...