Functional space expansion driven by transitions between energetically advantageous traits in the deep sea

Area of Science:

• Marine Biology
• Deep-Sea Ecology
• Climate Change Impacts

Background:

• Global climate change alters energy availability, impacting marine biodiversity and ecosystem functioning.
• Functional diversity, defined by species' traits and niches, is crucial for understanding ecosystem responses to environmental shifts.

Purpose of the Study:

• To investigate functional diversity patterns, functional niches, and traits in deep Atlantic bivalve communities.
• To analyze how energy availability influences the distribution and expansion of functional niches and traits.

Main Methods:

• Defined functional space using traits: feeding type, tiering, and motility level.
• Characterized functional niches as unique combinations of these traits.
• Examined bivalve communities across an energy gradient in the deep Atlantic Ocean.

Main Results:

• Increased energy availability led to niche expansion and the addition of new species, rather than niche packing.
• Most functional niches occurred at intermediate energy levels, with few adapted to extreme energy conditions.
• Tradeoffs in traits at intermediate energy facilitated niche coexistence, driving a unimodal pattern of functional niches.

Conclusions:

• Deep-sea bivalve communities exhibit complex dynamics in functional niches influenced by energy availability.
• Energy-limited communities, particularly those with intermediate energy, may be vulnerable to future changes in food availability due to climate change.