Ecophysiology of Aquatic Ciliates
Summary
Aquatic ciliates are single-celled eukaryotes whose diverse feeding modes and rapid physiological responses underpin key processes in both marine and freshwater ecosystems. Ecophysiology examines how environmental factors—such as temperature, food availability, chemical stressors and predation—govern ciliate metabolism, growth and survival. These protists act as pivotal links in microbial food webs, transferring energy from bacteria and small algae to higher trophic levels while regulating nutrient cycling. Their numerical responses to prey concentrations, clearance rates and thermal performance curves provide quantitative insight into how populations expand or decline under fluctuating conditions. Ciliate traits such as encystment enable survival during adverse periods, whereas mixotrophic species further modulate carbon flow by combining photosynthesis with phagotrophy. Understanding the interplay of bottom-up drivers (nutrient and prey supply) and top-down controls (grazing and parasitism) is essential for predicting how ciliates will influence ecosystem resilience in a changing climate.
Research from Nature Portfolio
Recent work has highlighted the differential strength of consumer control on ciliate populations in lakes versus the open ocean. Experimental comparisons of microcrustacean grazing revealed that cladocerans in freshwaters exert more intense top-down pressure on ciliates than copepods in marine systems. Meta-analyses showed that ingestion and clearance rates vary with predator feeding mode and ciliate cell size, leading to a stronger predator–prey coupling in lakes. These findings emphasise that spatial variation in top-down control shapes ciliate abundance and community composition, with implications for nutrient recycling and food-web dynamics across aquatic biomes.
Ecophysiology of Aquatic Ciliates publication trend
The graph below shows the total number of articles in ecophysiology of aquatic ciliates across all publications each year (not limited to Nature Index journals).
Technical terms
Clearance rate: Volume of water cleared of prey by a ciliate per unit time, reflecting feeding efficiency.
Numerical response: Relationship between prey concentration and ciliate population growth rate.
Thermal performance curve: Graphical representation of a physiological rate (e.g. growth) across a temperature gradient.
Top-down control: Regulation of ciliate abundance by predators or parasites.
Bottom-up control: Influence of prey availability and nutrient supply on ciliate growth and reproduction.
Encystment: Process by which a ciliate forms a dormant, resistant cyst to survive unfavourable conditions.
References
- Top-down control of planktonic ciliates by microcrustacean predators is stronger in lakes than in the ocean. Scientific Reports (2022).
- Effect of microplastic particles on the population growth rate and clearance rate of selected ciliates (Protista, Ciliophora). Environmental Science and Pollution Research (2023).
- Numerical and Thermal Response of the Bacterivorous Ciliate Colpidium kleini, a Species Potentially at Risk of Extinction by Rising Water Temperatures. Microbial Ecology (2024).
- Physiological mortality of planktonic ciliates: Estimates, causes, and consequences. Limnology and Oceanography (2024).
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