EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
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;
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Jill Welter
(), St. Catherine University, jrwelter@stkate.edu;
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Delorianne Sander
(), St.Catherine University, drsander12@gmail.com;
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Lyndsie Collis
(), The Ohio State University, collis.21@buckeyemail.osu.edu;
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Jonathan Benstead
(), University of Alabama, jbenstead@ua.ed;
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Wyatt Cross
(), Montana State University, wyatt.cross@montana.edu ;
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Jim Hood
(), The Ohio State University, Hood.211@osu.edu;
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Alexander D. Huryn
(), The University of Alabama, huryn@ua.edu;
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Philip Johnson
(), University of Alabama, Pjohnson@eng.ua.edu;
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Jón Ólafsson
(), Marine and Freshwater Research Institute, josh@veidimal.is;
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Gisli Mar Gislason
(), University of Iceland, gmg@hi.is;
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