Lake Diatom Responses to Warming Reviewing the Evidence
Highly branched isoprenoids: a novel tracer of diatom-based energy pathways in freshwater nutrient webs
Sydney Wilkinson
A C , Thomas Brownish B and Bailey C. McMeans A + Author Affiliations
- Author Affiliations
A University of Toronto Mississauga, 3359 Mississauga Road, Mississauga, ON, L5L 1C6, Canada.
B Scottish Association for Marine Science, Oban, Argyll, PA37 1QA, UK.
C Corresponding author. Email: wilkinson.syd@gmail.com
Marine and Freshwater Research - https://doi.org/x.1071/MF20059
Submitted: 24 February 2020 Accepted: ane July 2020 Published online: 12 Baronial 2020
Abstract
In complex food webs, it is often difficult to classify all trophic interactions, especially when the number of potential energy sources and interacting species tin be high. Biochemical markers (biomarkers) can help trace energy-menses pathways from basal sources up to acme predators, merely can suffer from poor resolution when multiple sources all produce the same biomarker (e.g. many algae produce long-chain unsaturated fatty acids). Highly branched isoprenoids (HBIs) are unique lipids produced past diatoms, which have been successfully practical as biomarkers of diatom-derived energy pathways through marine food webs. Withal, currently, the beingness and trophic transfer of HBIs has not been explored in freshwater nutrient webs. Here, we confirm, for the outset time, the presence of two HBI isomers (IIb and IIc) across 2 temperate-lake food webs, from lower basal sources upwardly to higher trophic-position consumers (predatory fishes). Lake ecosystems are facing multiple interacting threats that could influence nutrient-web structure and function in circuitous means. HBIs could provide a novel method for tracing the result of contradistinct temperature, nutrient loading and water clarity on loftier-quality, diatom-derived energy pathways through freshwater food webs.
Keywords: algae, biomarker, consumer, diatom, freshwater, nutrient web, highly branched isoprenoids, trophic-level.
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