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Dispersal synchronizes giant kelp forests.

Miriam S Wanner1, Jonathan A Walter1,2, Daniel C Reuman3

  • 1Department of Environmental Sciences, University of Virginia, Charlottesville, Virginia, USA.

Ecology
|February 28, 2024
PubMed
Summary
This summary is machine-generated.

Dispersal significantly drives spatial synchrony in giant kelp populations, influencing ecosystem stability. This study links population dynamics to marine dispersal patterns for the first time.

Keywords:
Moran effectdemographic connectivitydispersalkelp forestmatrix regressionmetapopulationnutrientspopulation dynamicsremote sensingspatial synchronystabilitywave disturbance

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Area of Science:

  • Marine ecology
  • Population dynamics
  • Ecosystem stability

Background:

  • Spatial synchrony, or correlated population fluctuations across locations, is key to ecosystem stability but poorly understood.
  • The role of dispersal in driving this synchrony in natural populations remains challenging to quantify.

Purpose of the Study:

  • To determine how dispersal structures spatial synchrony in the foundation species, giant kelp (Macrocystis pyrifera).
  • To statistically link dispersal mechanisms to observed synchrony in a natural marine population.

Main Methods:

  • Quantified giant kelp synchrony and fecundity using satellite imagery over 11 years and 880 km of coastline.
  • Estimated propagule dispersal probabilities with a high-resolution ocean circulation model.
  • Employed matrix regression models, controlling for distance, resources, and disturbance, to assess dispersal's impact on synchrony.

Main Results:

  • Dispersal was identified as a significant driver of spatial synchrony in giant kelp populations.
  • Findings were robust across different dispersal metrics and mortality assumptions.
  • Dispersal and environmental factors created distinct geographic clusters with unique synchrony patterns.

Conclusions:

  • This research provides statistical evidence associating synchrony with dispersal in a natural marine population.
  • Dispersal and environmental conditions synchronize foundation species, potentially impacting broader biodiversity and ecosystem function.
  • The study advances understanding of synchrony mechanisms in marine ecosystems.