Effects of light and nutrients on periphyton and the fatty acid composition and somatic growth of invertebrate grazers in subtropical streams

Oecologia
Fen GuoStuart E Bunn

Abstract

Algal polyunsaturated fatty acids (PUFA), essential for somatic growth and reproduction of aquatic animals, are influenced by ambient environmental conditions, including light and nutrients. Few studies have addressed the extent to which changes in algal PUFA can influence stream herbivore PUFA profiles and the implications for stream food webs. We manipulated subtropical stream periphyton by applying two light levels (open and shaded canopy) and two nutrient regimes (ambient and enriched) to investigate the response of PUFA and somatic growth in stream herbivores. After 6 weeks, the relative content of periphyton PUFA (%) changed distinctly and differed among treatments. Periphyton in the control treatment with open canopy showed a decline in eicosapentaenoic acid (EPA) relative to initial conditions, whereas shading increased EPA and total highly unsaturated FA (HUFA), but decreased α-linolenic acid (ALA), linoleic acid and total C18 PUFA. The interaction of open canopy and added nutrients increased periphyton ALA compared with initial conditions, while the combined effects of shading and added nutrients led to greater total HUFA. FA similarity between stream grazers (the mayfly Austrophlebioides and caddisfly Helicopsyche) a...Continue Reading

References

Jan 1, 2004·Nature·Dörthe C Müller-NavarraCharles R Goldman
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Citations

Aug 27, 2019·Freshwater Biology·Sarah B WhorleyJohn D Wehr
May 6, 2020·Environmental Toxicology and Chemistry·Mariem FadhlaouiClaude Fortin
Feb 2, 2021·Ecology and Evolution·Adam D Canning, Russell G Death
Dec 24, 2021·The Science of the Total Environment·Fen GuoMartin J Kainz

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