2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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5/23/2018 | 10:15 AM - 10:30 AM | TEMPERATURE-NUTRIENT INTERACTIONS REGULATE BIOFILM SPECIES COMPOSITION IN NITROGEN-POOR SYSTEMS | 330 B

TEMPERATURE-NUTRIENT INTERACTIONS REGULATE BIOFILM SPECIES COMPOSITION IN NITROGEN-POOR SYSTEMS

Key drivers of ecosystem structure and function including eutrophication and climate warming are altering watershed attributes in ways that fundamentally change stream biofilm species composition. For example, in N-poor ecosystems, N₂-fixing taxa can consist of palatable diatoms in the Rhopalodiaceae or less-palatable cyanobacteria such as Nostoc and Anabaena spp. Which taxa thrive under various temperature and nutrient (N and P availability) conditions can influence rates of nutrient cycling as well as larger-scale food web dynamics. We manipulated temperature as well as N and P availability in a streamside channel experiment in the Hengill region of Iceland to assess their interactive effects on biofilm structure. In N-poor channels, N₂-fixing cyanobacteria and/or diatoms generally dominated, although biofilms accrued little biomass and had more variable assemblage structure at the lowest temperatures. Rhopalodiaceae, especially Rhopalodia, increased under warmer, N-poor conditions, particularly with the addition of P. In contrast, with N addition, biofilm structure quickly shifted to non-N₂-fixing diatoms, including Melosira, while high P stimulated growth of green algae. Our results reinforce how among taxa variation in different modes of resource acquisition and demand drives ecosystem responses to eutrophication and warming.

Temperature
Nutrients
Climate Change

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Presenters/Authors

Paula Furey (), St. Catherine University, pcfurey@stkate.edu;