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Cascading impacts of changes in subsidy quality on recipient ecosystem functioning.

Stephen E Osakpolor1, Alessandro Manfrin1, Shawn J Leroux2

  • 1Institute for Environmental Sciences, RPTU University of Kaiserslautern-Landau, Landau, Germany.

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|March 9, 2023
PubMed
Summary

This study introduces a new model to predict how subsidy quality, like fatty acids, affects ecosystem functions. High-quality subsidies significantly boost ecosystem functioning, especially recycling.

Keywords:
allochthonous inputaquatic-terrestrial linkagesecosystem functionmeta-ecosystemmodelpolyunsaturated fatty acidsrecipient ecosystemtheory

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Area of Science:

  • Ecology
  • Ecosystem Science
  • Environmental Science

Background:

  • Adjacent ecosystems exchange resources (subsidies), impacting each other's functioning.
  • Global environmental change alters subsidy quantity and quality, but models primarily address quantity.
  • Lack of models predicting subsidy quality's impact on recipient ecosystem functioning.

Purpose of the Study:

  • Develop a novel model to predict the effects of subsidy quality on recipient ecosystem biomass, recycling, production, and efficiency.
  • Analyze how changes in subsidy quality (e.g., PUFAs) affect riparian ecosystem dynamics.
  • Unify the subsidy and food quality hypotheses to understand ecosystem connections.

Main Methods:

  • Developed a novel predictive model for subsidy quality impacts.
  • Parameterized the model using a case study of a riparian ecosystem subsidized by aquatic insects.
  • Focused on long-chain polyunsaturated fatty acids (PUFAs) as a measure of subsidy quality.
  • Conducted a global sensitivity analysis to identify key drivers.

Main Results:

  • Subsidy quality significantly enhanced recipient ecosystem functioning.
  • Recycling increased more than production per unit increase in subsidy quality, indicating a threshold effect.
  • Model predictions were most sensitive to basal nutrient input in the recipient ecosystem.
  • Aquatic-terrestrial ecotones relying on high-quality subsidies are sensitive to changes in these connections.

Conclusions:

  • The novel model successfully predicts the impact of subsidy quality on ecosystem functioning.
  • Recipient ecosystem nutrient levels are crucial for understanding subsidy impacts.
  • High-quality subsidies are vital for certain ecosystems, making them vulnerable to altered connections.
  • The model offers testable predictions for ecosystem connections under global change.