2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/26/2021 | 8:30 AM - 10:30 AM | PERIPHYTIC BIOFILM FATTY ACID PROFILES ALONG A NUTRIENT-ENRICHMENT GRADIENT IN SOUTHERN QUEBEC | Virtual Platform
PERIPHYTIC BIOFILM FATTY ACID PROFILES ALONG A NUTRIENT-ENRICHMENT GRADIENT IN SOUTHERN QUEBEC
There has been an increase in interest for the use of biofilm fatty acids (FAs) as a proxy for basal food resource quality and as a potential stream assessment tool. However, new knowledge is needed to support use of FAs in monitoring of human impacts such as those associated with eutrophication. Biofilm samples were collected from 45 streams representing a nutrient-enrichment gradient in southern Quebec (Canada). Among all the sampling sites, saturated FA (SFA) were generally the most abundant, accounting for 30% to 56%. The major SFA detected were C16:0 and C18:0, while the major monounsaturated (MUFA) were C16:1?7 and C18:1?9. The polyunsaturated FA (PUFA) detected at high proportions were C18:2?6 [LIN], C18:3?3 [ALA], and C20:5?3 [EPA]. Ordination based analyses showed marked difference in FA composition among stations, but relationships with nutrient concentrations and diatom-based assessment indices were not clear. Indeed, contrary to our hypothesis, certain nutrient-enriched streams located in heavily farmed areas showed high proportions of essential fatty acids suggesting high nutritional quality of the biofilms. Further study is needed to understand how FA composition of stream biofilms respond to nutrients.
- Nutrients
- Stream
- Stressor
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Presenters/Authors
Nicholas Kiulia
(), Institut National de la Recherche Scientique (INRS-ETE), Quebec, Canada, nicholas.kiulia@ete.inrs.ca;
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Mariem Fadhlaoui
(), Institut National de la Recherche Scientique (INRS-ETE), Quebec, Canada, mariem.fadhlaoui@ete.inrs.ca;
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Adam Yates
(), University of Waterloo, adam.yates@uwaterloo.ca;
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Isabelle Lavoie
(), Institut National de la Recherche Scientifique, Centre Eau Terre Environnement, isabelle.lavoie@ete.inrs.ca;
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