Dissolved organic matter regulates nutrient limitation and growth of benthic algae in northern lakes through interacting effects on nutrient and light availability

• Published in: Limnology and Oceanography Letters
• Main Authors: Megan L. Fork, Jan Karlsson, Ryan A. Sponseller
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2020
• Subjects: Oceanography; GC1-1581; Northern Sweden
• Online Access: https://doi.org/10.1002/lol2.10166; https://doaj.org/article/d32fb3a9914f4123ba9f6b05cd1adcc0

Abstract Widespread increases in dissolved organic matter (DOM) concentration across northern lakes can alter rates of primary production by increasing nutrient availability and decreasing light availability. These dual effects of DOM generate a unimodal relationship in pelagic primary production and primary producer biomass among lakes over a gradient of DOM concentration. However, the responses of benthic algae to variation in DOM loading are less clear because of their potential to access sediment nutrients. We tested algal production and nutrient limitation along a DOM gradient in northern Sweden. Without added nutrients, benthic algal production showed a unimodal relationship with DOM, similar to reported pelagic responses. Nutrient addition revealed widespread nitrogen limitation, with decreasing severity in lakes with higher DOM. Because the majority of northern Swedish lakes currently fall below the inflection point in this unimodal relationship, moderate increases in DOM have the potential to increase benthic primary production, particularly for epilithic algae.