Physiological Ecology of Suspension-Feeding Bivalves

Suspension-feeding bivalves—clams, mussels, oysters and deep-sea species—play a central role in aquatic ecosystems by filtering particulate organic matter, mediating biogeochemical cycles and providing ecosystem services such as water clarification and nutrient recycling. The physiological ecology of these organisms encompasses gill morphology and ciliary function, clearance and filtration dynamics, metabolic rate adjustments, energy budgeting and stress responses. Key metrics include clearance rate (the volume of water cleared of particles), filtration rate (mass of particles processed) and scope for growth (net energy allocation to somatic growth and reproduction after maintenance costs). Environmental drivers such as temperature, oxygen availability and seston characteristics shape feeding efficiency, metabolic demand and cellular integrity, often in combination. Many species exhibit physiological plasticity, adjusting digestive absorption, enzyme activity and behavioural feeding to cope with fluctuating food loads or stressors. However, thresholds exist beyond which stressors—such as warming, acidification or sediment pollution—overwhelm compensatory mechanisms, leading to reduced growth, reproductive output or increased mortality. Understanding these integrated responses underpins fisheries management, aquaculture optimisation and the prediction of bivalve resilience in a changing climate.

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Physiological Ecology of Suspension-Feeding Bivalves publication trend

The graph below shows the total number of articles in physiological ecology of suspension-feeding bivalves across all publications each year (not limited to Nature Index journals).

Technical terms

Clearance rate: Volume of water cleared of particles by the bivalve per unit time, indicative of feeding capacity.

Filtration rate: Mass or volume of particulate matter processed by the gill and digestive system over time.

Scope for growth: Net energy available for growth and reproduction after accounting for metabolic maintenance costs.

Seston: Suspended particulate organic and inorganic matter in the water column serving as potential food.

Lysosomal membrane stability: Measure of cellular stress reflecting integrity of digestive organelles under adverse conditions.

Transcriptomics: Analysis of the full suite of RNA transcripts to assess gene-expression patterns and regulatory pathways.

References

1. The long-lived deep-sea bivalve Acesta excavata is sensitive to the dual stressors of sediment and warming. Marine Pollution Bulletin (2024).
2. Comparative transcriptomics identifies genes underlying growth performance of the Pacific black-lipped pearl oyster Pinctada margaritifera. BMC Genomics (2024).
3. Interacting climate change effects on mussels (Mytilus edulis and M. galloprovincialis) and oysters (Crassostrea gigas and Ostrea edulis): experiments for bivalve individual growth models. Aquatic Living Resources (2022).