Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Effects of nutrient availability and Ochromonas sp predation on size and composition of a simplified aquatic bacterial community |
| Abstract | Predation and competition are two main factors that determine the size and composition of aquatic bacterial populations. Using a simplified bacterial community, composed of three strains characterized by different responses to predation, a short-term laboratory experiment was performed to evaluate adaptations and relative success in communities with experimentally controlled levels of predation and nutrient availability. A strain with a short generation time (Pseudomonas putida), one with high plasticity in cell morphology (Flectobacillus sp. GC5), and one that develops microcolonies (Pseudomonas sp. CM10), were selected. The voracious flagellate Ochromonas sp. was chosen as a predator. To describe adaptations against grazing and starvation, abundance, biomass and relative heterogeneity of bacteria were measured. On the whole, the strains in the predation-free cultures exhibited unicellular growth, and P. putida represented the largest group. The presence of Ochromonas strongly reduced bacterial abundance, but not always the total biomass. The activity of grazers changed the morphological composition of the bacterial communities. Under grazing pressure the relative composition of the community depended on the substrate availability. In the presence of predators, P. putida abundance declined in both high and low nutrient treatments, and Pseudomonas CM10 developed colonies. Flectobacillus was only numerically codominant in the nutrient-rich environments. |
| Source | FEMS microbiology, ecology (print) 58 (3), pp. 354–363 |
| Keywords | grazing on bacteriaprey-predator interactionphenotypic adaptationfilamentmicrocolony |
| Journal | FEMS microbiology, ecology (print) |
| Editor | Elsevier, Amsterdam, Paesi Bassi |
| Year | 2006 |
| Type | Articolo in rivista |
| DOI | 10.1111/j.1574-6941.2006.00185.x |
| Authors | Corno, Gianluca |
| Text | 407743 2006 10.1111/j.1574 6941.2006.00185.x ISI Web of Science WOS 000242016000005 grazing on bacteria prey predator interaction phenotypic adaptation filament microcolony Effects of nutrient availability and Ochromonas sp predation on size and composition of a simplified aquatic bacterial community Corno, Gianluca CNR; Max Planck Inst Limnol Predation and competition are two main factors that determine the size and composition of aquatic bacterial populations. Using a simplified bacterial community, composed of three strains characterized by different responses to predation, a short term laboratory experiment was performed to evaluate adaptations and relative success in communities with experimentally controlled levels of predation and nutrient availability. A strain with a short generation time Pseudomonas putida , one with high plasticity in cell morphology Flectobacillus sp. GC5 , and one that develops microcolonies Pseudomonas sp. CM10 , were selected. The voracious flagellate Ochromonas sp. was chosen as a predator. To describe adaptations against grazing and starvation, abundance, biomass and relative heterogeneity of bacteria were measured. On the whole, the strains in the predation free cultures exhibited unicellular growth, and P. putida represented the largest group. The presence of Ochromonas strongly reduced bacterial abundance, but not always the total biomass. The activity of grazers changed the morphological composition of the bacterial communities. Under grazing pressure the relative composition of the community depended on the substrate availability. In the presence of predators, P. putida abundance declined in both high and low nutrient treatments, and Pseudomonas CM10 developed colonies. Flectobacillus was only numerically codominant in the nutrient rich environments. 58 Published version Articolo in rivista Elsevier 0168 6496 FEMS microbiology, ecology print FEMS microbiology, ecology print FEMS microbiol. ecol. print FEMS microbiology, ecology. print Federation of European Microbiological Societies microbiology, ecology print gianluca.corno CORNO GIANLUCA |