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Linking degradation status with ecosystem vulnerability to environmental change.

David G Angeler1, Didier L Baho, Craig R Allen

  • 1Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, PO Box 7050, 750 07, Uppsala, Sweden, david.angeler@slu.se.

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Ecosystem degradation does not necessarily increase vulnerability to environmental change. This study found similar resilience in acidified and circumneutral lakes, suggesting equal vulnerability to observed changes.

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Area of Science:

  • Ecology
  • Environmental Science
  • Freshwater Biology

Background:

  • Environmental changes can trigger ecosystem regime shifts, impacting vital ecosystem services.
  • The relationship between ecosystem degradation and vulnerability to environmental change remains unclear.
  • Understanding ecosystem resilience is crucial for predicting responses to environmental shifts.

Purpose of the Study:

  • To assess and compare the ecological resilience of acidified (degraded) and circumneutral (undegraded) lakes.
  • To determine if degradation status correlates with vulnerability to environmental change and the risk of regime shifts.
  • To evaluate invertebrate assemblages' temporal dynamics and functional feeding groups in relation to resilience.

Main Methods:

  • Utilized long-term data (1988-2012) from acidified and circumneutral lakes.
  • Applied time series modeling to identify temporal frequencies in invertebrate population dynamics.
  • Assessed functional feeding groups and species with stochastic dynamics for resilience attributes.

Main Results:

  • Identified three consistent patterns of invertebrate temporal dynamics across lakes.
  • Found no significant differences in functional richness, evenness, diversity, or redundancy between acidified and circumneutral lakes.
  • Observed similar resilience characteristics, indicating comparable vulnerability to environmental changes in both lake types.

Conclusions:

  • The degradation status of lakes did not correlate with differing vulnerability to the observed environmental changes.
  • The study's approach quantifies ecological resilience to assess systemic vulnerability across ecosystems.
  • Quantifying resilience aids in reducing uncertainty in predicting ecosystem responses to environmental change.