Can niche plasticity mediate species persistence under ocean acidification?

Area of Science:

• Marine ecology
• Climate change biology
• Ecosystem dynamics

Background:

• Global change stressors, including ocean acidification, alter species' ecological niches and interactions.
• Species with high niche plasticity may benefit from rapidly changing environments.

Purpose of the Study:

• To investigate the effects of ocean acidification on the niche modifications of a temperate rocky reef fish assemblage using natural CO2 vents.
• To quantify niche traits (overlap, shift, breadth) across trophic, habitat, and behavioral dimensions.

Main Methods:

• Utilized natural CO2 vents as a proxy for ocean acidification.
• Quantified ecological niche traits (overlap, shift, breadth) across trophic, habitat, and behavioral dimensions for fish species.
• Assessed fish density and competitive interactions.

Main Results:

• One species significantly increased its niche width (trophic, behavioral) and shifted its habitat niche, experiencing a doubling in density.
• Other species showed limited niche width increases (habitat niche only) with minor density changes.
• The dominant species expanded its niche, increasing overlap with other species and potentially reducing their abundances.

Conclusions:

• Niche plasticity across multiple dimensions may be a key adaptation for fish in high-CO2 environments.
• Habitat simplification under ocean acidification drives niche modifications.
• Competitive interactions are altered, favoring species with greater niche plasticity.