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

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.