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 | 9:30 AM - 9:45 AM | THIAMINE LIMITATION OF PERIPHYTON IN ADIRONDACK STREAMS | 330 B
THIAMINE LIMITATION OF PERIPHYTON IN ADIRONDACK STREAMS
Nutrient enrichment experiments were conducted in four Adirondack streams using nutrient diffusing substrates to evaluate the potential influence of thiamine (vitamin B1) on chlorophyll a accumulation by stream periphyton. This work was prompted by recent observations in marine ecosystems showing that the presence of thiamine regulates primary production. However, the specific role of thiamine was not explored in freshwaters. Contrasting treatments in our study included nutrient additions of thiamine (C12H17ClN4OS•HCl), nitrogen (NH4Cl), and phosphorus (NaH2PO4). Thiamine limitation was observed in 12 of 14 experiments conducted from June through October in 2015, 2016, and 2017. Nitrogen limitation was observed in eight experiments and phosphorus limitation in one experiment. Thiamine limitation did not change seasonally from spring through the fall, while N limitation appeared in spring and summer but not in the fall. The periphyton community structure was also influenced by nutritional availability. Among the periphyton communities growing on the substrates, the portion of Chlorophyta increased with the addition of thiamine and ammonium, especially for Scenedesmus and Ankistrodesmus, and the portion of Bacillariophyta increased with the addition of ammonium, especially for Synedra.
- Limitation
- Nutrients
- Algae
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Presenters/Authors
Binbin Wang
(), Cornell University, bw424@cornell.edu;
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