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Related Experiment Video

Updated: May 13, 2025

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Dissolved organic carbon and microplastics decrease the biodiversity effect on resource use efficiency of crustacean

Yongchao Peng1, Ninghui Xu1, Haojie Su2

  • 1Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-funded by Anhui Province and Ministry of Education of the People's Republic of China, School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China; Donghu Experimental Station of Lake Ecosystems, State key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.

Ecotoxicology and Environmental Safety
|May 10, 2025
PubMed
Summary

Increased dissolved organic carbon (DOC) boosted zooplankton biodiversity and resource use efficiency (RUE). However, DOC and microplastics weakened biodiversity

Keywords:
Body sizeCrustacean zooplanktonDissolved organic carbonMicroplasticsResource use efficiencySpecies richness

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Area of Science:

  • Ecology
  • Environmental Science
  • Aquatic Ecosystems

Background:

  • The link between biodiversity and ecosystem functioning is a key ecological concept.
  • Human activities like urbanization introduce dissolved organic carbon (DOC) and microplastics into lakes, impacting water quality and ecosystem services.
  • Limited understanding exists on how environmental changes affect the relationship between biodiversity and ecosystem functioning.

Purpose of the Study:

  • To investigate the effects of increased dissolved organic carbon (DOC) on crustacean zooplankton diversity and ecosystem functioning.
  • To assess how DOC and microplastic pollution alter the impact of biodiversity on trophic transfer efficiency.
  • To understand the implications for ecosystem services under global environmental change.

Main Methods:

  • A two-month mesocosm experiment was conducted.
  • The experiment manipulated dissolved organic carbon (DOC) concentrations.
  • Measurements included crustacean zooplankton taxonomic and functional richness, body size, resource use efficiency (RUE), and trophic transfer efficiency.

Main Results:

  • Increasing DOC concentration generally enhanced crustacean zooplankton taxonomic richness, functional richness, resource use efficiency (RUE), and body size.
  • Higher species richness, functional richness, and larger body size were positively correlated with zooplankton RUE.
  • The combined pressure of DOC and microplastics reduced the biodiversity effect on trophic transfer efficiency, particularly impacting the functional richness-RUE relationship.

Conclusions:

  • Biodiversity plays a crucial role in maintaining high ecosystem functions, with higher richness and larger body size essential for efficient resource use.
  • Environmental changes, including DOC and microplastic pollution, can diminish the positive effects of biodiversity on ecosystem functioning.
  • Current assessments may underestimate the negative impacts of diversity loss on ecosystem functions and services, highlighting the need for biodiversity conservation.