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Can marine reserves restore lost ecosystem functioning? A global synthesis.

Brian S Cheng1,2,3, Andrew H Altieri4,5, Mark E Torchin4

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Summary

Marine protected areas (MPAs) boost animal predation but not herbivory. MPAs increase predator abundance, raising predation risk significantly, but fail to alter herbivory rates on plants.

Keywords:
consumerecosystem functionfunctional redundancyherbivorymarine protected areameta-analysispredation

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Area of Science:

  • Marine ecology
  • Conservation science
  • Ecosystem function

Background:

  • Marine protected areas (MPAs) are widely used for biodiversity conservation and fisheries enhancement.
  • Previous assessments focused on MPAs' impact on community structure, neglecting their effects on ecological processes.
  • Understanding MPA effects on ecosystem functions like predation and herbivory is crucial for evaluating their ecological role.

Purpose of the Study:

  • To assess the impact of MPAs on ecological processes, specifically predation and herbivory rates.
  • To synthesize existing data through meta-analysis to evaluate MPA effectiveness on ecosystem functions.
  • To identify factors influencing predation risk and herbivory within MPAs.

Main Methods:

  • Conducted meta-analyses comparing predation and herbivory rates across 30 MPAs globally.
  • Synthesized data from 15,225 field experiment assays involving 32 species.
  • Quantified predation risk based on predator abundance, biomass, and sea-surface temperature.

Main Results:

  • MPAs significantly increased predation intensity on animals but showed no significant effect on herbivory rates.
  • Predation risk in MPAs was strongly correlated with increased predator abundance and biomass.
  • Predation risk decreased with rising sea-surface temperature; herbivory changes were minimal, possibly due to functional redundancy.

Conclusions:

  • MPAs can effectively restore critical ecosystem functions, such as predation, influencing energy flow and community assembly.
  • The study highlights a significant gap in research on MPA impacts on ecosystem functions, despite their widespread implementation.
  • Current marine predation levels may be a fraction of historical baselines due to human exploitation.