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Physiological Characterization of the Coral Holobiont Using a New Micro-Respirometry Tool
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Published on: April 28, 2023

Trait-based functional shifts in seaweed community across a temperature gradient.

Océane Attlan1, Albert Pessarrodona1, Thomas Wernberg1,2

  • 1UWA Oceans Institute & School of Biological Sciences, The University of Western Australia, Perth, Western Australia 6009, Australia.

Annals of Botany
|May 12, 2026
PubMed
Summary

Climate change alters temperate seaweed forests, shifting carbon cycling and sediment dynamics. Rising temperatures reduce functional diversity, impacting ecosystem stability.

Keywords:
Kelp forestsfunctional ecologyfunctional groupmacroalgaeregime shiftstropicalisation

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Area of Science:

  • Marine ecology
  • Ecosystem functioning
  • Climate change impacts

Background:

  • Climate change causes species distribution shifts, impacting ecosystems.
  • Temperate seaweed forests provide vital ecosystem services but are reorganizing.
  • Understanding trait-based shifts in seaweed communities is crucial.

Purpose of the Study:

  • Investigate how climate-driven community shifts affect seaweed forest traits and functions.
  • Analyze functional trait variation along a latitudinal temperature gradient.
  • Predict future ecosystem functioning under environmental change.

Main Methods:

  • Employed a space-for-time substitution approach.
  • Utilized a trait-based framework to assess functional shifts.
  • Defined functional entities (FEs) based on trait combinations for 43 seaweed taxa.

Main Results:

  • Seaweed communities showed temperature-driven shifts in carbon cycling and sediment dynamics.
  • Warmer sites exhibited seasonal carbon dynamics, slower decomposition, and sediment accumulation.
  • Cool-water seaweeds displayed unique functional traits across ecosystem functions.

Conclusions:

  • Rising temperatures restructure seaweed forest functional composition.
  • Expect reduced functional diversity and altered ecosystem processes.
  • Temperate reef ecosystem stability may be compromised.