AI Article Synopsis
- A study measured predation rates of two strains of Acanthamoeba castellanii on different strains of Pseudomonas putida, linking these rates to the size of the prey cells.
- Pseudomonas species were isolated from both pristine and metal-contaminated rivers to see how environmental conditions affected their metabolic responses to cadmium stress.
- The contaminated strain was quicker to regain metabolic activity under cadmium stress but was less efficient in resource use, and A. castellanii preferred to prey on this strain under high cadmium levels.
Article Abstract
Predation rates were measured for two Acanthamoeba castellanii strains feeding on metal-tolerant and metal-sensitive strains of Pseudomonas putida and compared with cellular thermodynamic data. Predation rates by A. castellanii strain ATCC 30010 correlated with cell volume of the prey. To explore whether this observation could be environmentally relevant, pseudomonad species were isolated from a pristine and a metal-contaminated river and were paired based on phylogenetic and physiological relatedness. Then, cellular thermodynamics and predation rates were measured on the most similar pseudomonad pair. Under cadmium stress, the strain from contaminated river sediments, Pseudomonas sp. CF150, exited metabolic dormancy faster than its pair from pristine sediments, Pseudomonas sp. N9, but consumed available resources less efficiently (more energy was lost as heat). Predation rates by both strains of ameba were greater on Pseudomonas sp. CF150 than on Pseudomonas sp. N9 at the highest cadmium concentration.
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| http://dx.doi.org/10.1111/1574-6968.12226 | DOI Listing |
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