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Kelp-forest dynamics controlled by substrate complexity.

Zachary Randell1, Michael Kenner2, Joseph Tomoleoni2

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|February 19, 2022
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Summary
This summary is machine-generated.

Ecosystems shift states abruptly. Substrate complexity in kelp forests influences the number of states and shift speed, promoting kelp-urchin coexistence in complex habitats.

Keywords:
alternative stable stateecosystem stabilitykelp forestspotential analysisresilience

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Area of Science:

  • Marine ecology
  • Ecosystem dynamics
  • Conservation science

Background:

  • Kelp forests globally exhibit abrupt shifts to urchin-dominated states.
  • The mechanisms driving these ecosystem state shifts remain poorly understood.
  • Understanding these dynamics is crucial for effective management and conservation.

Purpose of the Study:

  • To investigate the role of substrate complexity in kelp forest ecosystem state shifts.
  • To analyze long-term data to identify factors controlling kelp forest dynamics.
  • To inform management and restoration strategies for kelp forests.

Main Methods:

  • Analysis of four decades of biannual monitoring data from San Nicolas Island, CA.
  • Superposition of community dynamics with reconstructed system stability landscapes.
  • Examination of spatial scales from island-wide to small (<10 m) areas.

Main Results:

  • Substrate complexity was found to control the number of alternative ecosystem states.
  • Higher substrate complexity leads to a single, resilient state of kelp-urchin coexistence.
  • Low-complexity sites experience abrupt, high-velocity state shifts initiated by pulse perturbations.

Conclusions:

  • Substrate complexity is a key factor influencing kelp forest stability and dynamics.
  • Complexity affects both top-down and bottom-up regulatory processes.
  • Findings offer valuable insights for holistic kelp forest management and conservation efforts.