Unraveling ecosystem functioning in intertidal soft sediments: the role of density-driven interactions

Area of Science:

• Marine Ecology
• Benthic Ecology
• Ecosystem Functioning

Background:

• Coastal habitats, particularly tidal flats, are highly productive yet threatened by human activities.
• Benthic communities in tidal flats are often structured by overlapping species distributions in transition zones.
• Understanding species interactions in these transition zones is crucial for ecosystem function assessment.

Purpose of the Study:

• To investigate the ecological consequences of species interactions in tidal flat transition zones.
• To quantify the drivers of biogeochemical fluxes and overall ecosystem functioning.
• To evaluate the predictive power of species abundance and biogenic features on ecosystem function.

Main Methods:

• A multi-site mensurative experiment was conducted to study spatial transitions in benthic communities.
• The study focused on the interaction of multiple factors influencing ecosystem function.
• Measurements included biogeochemical fluxes and the abundance of key species and their biogenic structures.

Main Results:

• Transition areas between habitats exhibited non-linear effects on biogeochemical fluxes.
• The abundance of two large, functionally different species, rather than overall biodiversity, significantly drove ecosystem function.
• Biogenic features created by infaunal species were better predictors of ecosystem functioning than species density alone.

Conclusions:

• Species interactions and habitat structure in transition zones play a critical role in coastal ecosystem functioning.
• Biogenic features offer a promising metric for large-scale monitoring of ecosystem health.
• Future research should focus on the role of specific species and their habitat modifications in driving ecosystem processes.