2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/25/2021 | 2:00 PM - 3:30 PM | ARE ALL N2-FIXING TAXA EQUAL?: TAXON-SPECIFIC NITROGEN-FIXATION RATES OF BENTHIC CYANOBACTERIA AND DIATOMS UNDER DIFFERENT ENVIRONMENTAL CONDITIONS | Virtual Platform
ARE ALL N2-FIXING TAXA EQUAL?: TAXON-SPECIFIC NITROGEN-FIXATION RATES OF BENTHIC CYANOBACTERIA AND DIATOMS UNDER DIFFERENT ENVIRONMENTAL CONDITIONS
In nitrogen-poor streams or under nitrogen-limiting conditions, algae and cyanobacteria that fix atmospheric nitrogen can have a competitive advantage over other taxa. However, as an energetically costly process, nitrogen fixation can be constrained by light availability and temperature levels. Environmental preferences of different N2-fixing species can further shape distribution patterns over time and space. The abundance and species composition of N2-fixing taxa, and their rates of N2-fixation can determine how, where, and under what conditions nitrogen enters the ecosystem and where it goes from there. From nitrogen-poor streams in Iceland and California, we compared N2-fixation rates for cyanobacteria (e.g., Anabaena, several Nostoc species, Rivularia) and Epithemia species (diatoms with cyanobacteria endosymbionts) under different light and temperature conditions. N2-fixation rates varied by genus and species, though light and temperature preferences complicated taxon-specific comparisons. N2-fixation rates generally increased with temperature but varied by taxon. Results highlighted areas needing further research. Knowledge of taxon-specific N2-fixation rates under varied environmental conditions will strengthen our ability to scale up predictions of nitrogen cycling and to predict biofilm response to our warming, nutrient-rich world.
- Nutrient cycling
- Stream
- Biogeochemistry
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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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