Changes of traits in a bacterial population associated with protozoal predation

Shikano, Shuichi; Luckinbill, Leo S.; Kurihara, Yasushi

doi:10.1007/bf02543868

Cited by 60 publications

(47 citation statements)

References 11 publications

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“…Filaments can be used to anchor colonies in place efficiently while allowing maximal contact with the surrounding environment along each cell's surface, a property that is likely to be useful for nutrient exchange in both aquatic and terrestrial habitats (Niklas 2000). Filaments would also serve as protection against grazing predators by being too large to ingest, an idea that has been tested experimentally with filamentous bacteria (Güde 1979;Shikano et al 1990). A third advantage of filaments is their utility for nutrient foraging because they direct growth along a vector that maximizes exploration of surrounding space.…”

Section: Filamentous Growth and Cytokinesismentioning

confidence: 99%

Green Algae and the Origins of Multicellularity in the Plant Kingdom

Umen

2014

Cold Spring Harbor Perspectives in Biology

114

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The green lineage of chlorophyte algae and streptophytes form a large and diverse clade with multiple independent transitions to produce multicellular and/or macroscopically complex organization. In this review, I focus on two of the best-studied multicellular groups of green algae: charophytes and volvocines. Charophyte algae are the closest relatives of land plants and encompass the transition from unicellularity to simple multicellularity. Many of the innovations present in land plants have their roots in the cell and developmental biology of charophyte algae. Volvocine algae evolved an independent route to multicellularity that is captured by a graded series of increasing cell-type specialization and developmental complexity. The study of volvocine algae has provided unprecedented insights into the innovations required to achieve multicellularity.

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Section: Filamentous Growth and Cytokinesismentioning

confidence: 99%

Green Algae and the Origins of Multicellularity in the Plant Kingdom

Umen

2014

Cold Spring Harbor Perspectives in Biology

114

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“…Protozoan grazing is an important key factor in shaping bacterial community composition in soils (Rønn et al, 2002), freshwater ecosystems (Ju¨rgens et al, 1999) and activated sludge (Gu¨de, 1979). Bacterial properties such as size, shape and cell wall composition play a role in protozoan selection of specific bacterial prey (Singh, 1942;Bianchi, 1989;Shikano et al, 1990;Gonza´lez et al, 1990;Gurijala and Alexander, 1990;Jezbera et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Molecular comparison of cultivable protozoa from a pristine and a polycyclic aromatic hydrocarbon polluted site

Lara

Berney

Ekelund

et al. 2007

Soil Biology and Biochemistry

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We compared the abundance and diversity of cultivable protozoa (flagellates and amoebae) in a polycyclic aromatic hydrocarbon (PAH) polluted soil and an unpolluted control, by isolating and cultivating clonal strains. The number of cultivable protozoa was higher in the polluted soil; however, the polluted soil displayed an impoverished community, dominated by certain taxa, such as Acanthamoeba sp. We isolated a total of 31 protozoan strains to characterize them morphologically and by 18S rRNA gene sequence analysis. This approach, i.e. combining morphological and molecular information had the advantage of providing quantitative data, information on morphology but also an accurate positioning of the isolates in 18S rRNA trees.

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“…Bacteria developed several grazing-defence strategies in order to decrease vulnerability or to avoid grazing induced mortality. Some bacterial strains show a high phenotypic plasticity and can outgrow the optimal food size range of the predator [13,34,36]. Another strategy depends on an increase of growth rate to compensate for cell losses [20,23].…”

Section: Introductionmentioning

confidence: 99%

Size Selective Feeding in Cyclidium glaucoma (Ciliophora, Scuticociliatida) and Its Effects on Bacterial Community Structure: A Study from a Continuous Cultivation System

et al. 2001

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A B S T R A C TThree aspects of size selective feeding by the scuticociliate Cyclidium glaucoma were studied in continuous cultivation systems. Firstly, grazing-induced changes in abundance, biomass, and size structure of a bacterial community were investigated. Secondly, we studied possible grazingprotection mechanisms of bacteria as a response to permanent presence of the predator. And finally, we were looking for potential feedback mechanisms within this predator-prey relationship, i.e., how the ciliate population reacted to a changed, more grazing-protected bacterial community. The first stage of the cultivation system consisted of the alga Cryptomonas sp. and the accompanying mixed bacterial community. These organisms were transferred to two second stage vessels, a control stage without ciliates and a second one inoculated with C. glaucoma. After the first week, the abundance of bacteria in the latter decreased by 60% and remained stable until the end of the experiment (65 d), whereas bacterial biomass was less affected (393 µg C L −1 during days 0-7, 281 µg C L −1 afterwards). The mean bacterial cell volume doubled from 0.089 µm 3 to 0.167 µm 3 , which was mainly due to increasing cell widths. During the whole investigation period formation of colonies or filaments was not observed, but we found a clear feedback of ciliates on bacterial size. An increase in bacterial cell volume was always followed by a decline of the predator population, resulting in a yet undescribed type of microbial predator-prey relation. Literature and our own data on the optimal food size range grazed by C. glaucoma showed that bacterial cell width rather than length was responsible for that observed phenomenon. Finally, we suggest that uptake rates of spherical latex beads give only limited information on truly ingestible prey volumes and that prey geometry should be considered in future studies on size selective feeding of protists.

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Changes of traits in a bacterial population associated with protozoal predation

Cited by 60 publications

References 11 publications

Green Algae and the Origins of Multicellularity in the Plant Kingdom

Green Algae and the Origins of Multicellularity in the Plant Kingdom

Molecular comparison of cultivable protozoa from a pristine and a polycyclic aromatic hydrocarbon polluted site

Size Selective Feeding in Cyclidium glaucoma (Ciliophora, Scuticociliatida) and Its Effects on Bacterial Community Structure: A Study from a Continuous Cultivation System

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