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Predicting the stability of multitrophic communities in a variable world.

Mallarie E Yeager1, Tarik C Gouhier1, A Randall Hughes1

  • 1Marine and Environmental Science, Marine Science Center, Northeastern University, Nahant, Massachusetts, 01908, USA.

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Local ecosystem size and dispersal limitation directly impact community stability, not just species richness. Understanding these factors is key for predicting ecological changes in a variable world.

Keywords:
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Area of Science:

  • Ecology
  • Environmental Science
  • Community Ecology

Background:

  • Identifying factors that destabilize ecological communities is crucial for predicting environmental change impacts.
  • While ecosystem size and dispersal are known to influence biodiversity, their direct effects on community stability are less understood.

Purpose of the Study:

  • To investigate the direct and indirect effects of local ecosystem size and regional dispersal on multitrophic community stability.
  • To determine if species richness mediates the relationship between ecosystem size, dispersal, and community stability.

Main Methods:

  • Studied invertebrate and fish communities in coastal ponds.
  • Assessed community instability in relation to local pond size and distance to the ocean (dispersal proxy).

Main Results:

  • Community instability was negatively correlated with local pond size.
  • Community instability was positively correlated with distance to the ocean, indicating dispersal limitation.
  • These effects were direct, not mediated by species richness.

Conclusions:

  • The diversity-stability relationship may be an epiphenomenon in these systems.
  • Local and regional factors, historically linked to species richness, can directly predict multitrophic community stability.
  • These findings offer a more direct approach to predicting community stability in changing environments.