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Related Experiment Video

Updated: May 7, 2025

Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter
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Does periphyton turn less palatable under grazing pressure?

Feng Zhu1,2, Xiang Tan1,3, Xingzhong Wang4

  • 1Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, P.R. China.

ISME Communications
|January 6, 2025
PubMed
Summary
This summary is machine-generated.

Grazing by snails like Bellamya aeruginosa reduced high-quality periphyton, decreasing food quality. This shift impacts stream food webs by altering essential fatty acid content and gene expression in periphyton communities.

Keywords:
biofilmfatty acidsfood qualityfood webstop-downtranscriptome analysis

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Area of Science:

  • Aquatic ecology
  • Stream ecosystem dynamics
  • Primary production and food webs

Background:

  • Periphyton is a key primary producer in stream food webs, influenced by both bottom-up and top-down grazing pressures.
  • The specific mechanisms driving these interactions and their impact on periphyton food quality remain incompletely understood.

Purpose of the Study:

  • To investigate the response of periphyton to grazing pressure from the freshwater snail Bellamya aeruginosa.
  • To assess changes in periphyton food quality, focusing on polyunsaturated fatty acid (PUFA) biomarkers.
  • To elucidate the compositional, chemical, and molecular underpinnings of grazing effects on stream food webs.

Main Methods:

  • A mesocosm experiment was conducted to simulate grazing pressure on periphyton communities.
  • Analysis of periphyton composition, focusing on shifts in Bacillariophyta, Cyanophyta, and Chlorophyta.
  • Biomarker analysis of essential polyunsaturated fatty acids (PUFAs), including eicosapentaenoic acid (20:5n3) and docosahexaenoic acid (22:6n3).
  • Gene expression analysis related to lipid metabolism, unsaturated fatty acid biosynthesis, and energy metabolism.

Main Results:

  • Grazing pressure by Bellamya aeruginosa led to a decrease in Bacillariophyta, a group rich in essential long-chain PUFAs.
  • An increase in Cyanophyta and Chlorophyta was observed, which are characterized by shorter-chain PUFAs.
  • Upregulation of genes involved in lipid, alpha-linolenic acid, and glycerophospholipid metabolism was detected, indicating periphyton's adaptive responses.
  • Overall periphyton food quality, indicated by PUFA content, decreased under grazing pressure.

Conclusions:

  • Grazing by freshwater snails significantly alters periphyton community structure and reduces food quality by decreasing essential PUFA content.
  • The study reveals molecular mechanisms, including gene expression changes in lipid metabolism, by which periphyton responds to grazing.
  • These findings clarify the interactive bottom-up and top-down effects structuring stream food webs, highlighting the importance of food quality.