Morphological changes during the growth cycle of axenic and monoxenic <i>Tetrahymena pyriformis</i>

Taylor, William D.; Gates, Michael A.; Berger, Jacques

doi:10.1139/z76-232

Cited by 15 publications

(5 citation statements)

References 22 publications

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“…1). A number of authors have shown similar high correlations between biovolume and biomass for the algae Euglena [8], Selenastrum and Chlorella [37], and protozoa Tetrahymena [4,32] and Colpidium [31 ]. Drake and Tsuchiya [11 ] established the accuracy of electronic techniques for counting mixed populations of microorganisms and applied their procedures to differential counting of mixed cultures of bacteria and protozoa, bacteria and yeast, and large and small bacteria.…”

Section: Discussionmentioning

confidence: 99%

Experimental and modeling studies of a four-trophic level predator-prey system

Graham

Canale

1982

Microb Ecol

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Experimental studies of a microbial food chain involving organic carbon substrates,Enterobacter aerogenes, and ciliate protozoansParamecium primaurelia andDldinium nasutum were conducted in stirred, aerated batch cultures. Quantitative measurements were made of organic carbon levels and of cell numbers, mean cell volumes, and total biovolumes for all three microbial populations. A mathematical model based on Monod kinetics was developed to describe this four-trophic level predator-prey system. The model was formulated in terms of biovolume, which is the product of cell numbers and mean cell size, and includes terms for bio-volume decay. Batch culture data were used to derive parameter values, and model simulations were compared to experimental results. Despite the significance ofParamecium-Didinium studies in ecological literature, the entire food chain has not been previously studied or modeled.

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Section: Discussionmentioning

confidence: 99%

Experimental and modeling studies of a four-trophic level predator-prey system

Graham

Canale

1982

Microb Ecol

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“…This seven‐days period ensures that genotypes all reached the stationary phase of their logistic growth. The normalization of measurements at the same phase is important because the morphology of cells changes along the growth cycle in axenic Tetrahymena cultures (Taylor et al 1976). The ‘after' measurement was used to quantify traits at the exact time of dispersal.…”

Section: Methodsmentioning

confidence: 99%

Transgenerational plasticity of dispersal‐related traits in a ciliate: genotype‐dependency and fitness consequences

Cayuela

Jacob

Schtickzelle

et al. 2022

Oikos

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Phenotypic plasticity, the ability of one genotype to produce different phenotypes in different environments, plays a central role in species' response to environmental changes. Transgenerational plasticity (TGP) allows the transmission of this environmentally-induced phenotypic variation across generations, and can influence adaptation. To date, the genetic control of TGP, its long-term stability, and its potential costs remain largely unknown, mostly because empirical demonstrations of TGP across many generations in several genetic backgrounds are scarce. Here, we examined how genotype determines the TGP of phenotypic traits related to dispersal, a fundamental process in ecology and evolution. We used an experimental approach in Tetrahymena thermophila, a ciliate model-species, to determine if and how phenotypic changes expressed following a dispersal treatment are inherited over multiple generations. Our results show that morphological and movement traits associated with dispersal are plastic, and that these modifications are inherited over at least 35 generations. The fitness costs and benefits associated with these plastic changes are also transmitted to further generations. We highlight that the genotype modulates the expression and reversibility of transgenerational plasticity of dispersal-related traits and its fitness outcomes. Our study thus suggests that genotype-dependent TGP could play an important role in eco-evolutionary dynamics as dispersal determines gene flow and the long-term persistence of natural populations.

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“…The possibility always exists that under different culture conditions higher growth rates could be attained. This error is magnified by r/L because ciliates in balanced growth at less than their maximal rate are smaller than when they are growing more rapidly (Curds and Cockburn, 1971 ;Taylor et al, 1976). The bacterial species used as food in this study, A. aerogenes, has been widely used as a food for ciliates with few reported cases of toxicity.…”

Section: The Reliability Of the Maximum Growth Rate Estimatesmentioning

confidence: 99%

Maximum growth rate, size and commonness in a community of bactivorous ciliates

Taylor

1978

Oecologia

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Adaptions which confer competitive ability or resistance to predation are thought to be evolved with a resultant loss in intrinsic rate of increase (r ). Therefore species which are opportunistic should retain high values of r, whereas competitively superior species which employ a strategy of persistance will have low values of r . Whether a ciliate species is slow or fast-growing can be judged by comparison with the empirically derived equation relating growth rate and size given by Fenchel (1968).This hypothesis was tested on a group of eleven species of bactivorous ciliates inhabiting a small pond. Species' measured and predicted r'S [Formula: see text] were compared with their commonness in the field. The prediction that species with high values of [Formula: see text] would be less common, as measured by the number of samples in which they are found, was satisfied by the data. The implications of the data for the ciliate community studied and the potential of [Formula: see text] as a predictor of ecological characteristics of species are discussed.

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Morphological changes during the growth cycle of axenic and monoxenic Tetrahymena pyriformis

Cited by 15 publications

References 22 publications

Experimental and modeling studies of a four-trophic level predator-prey system

Experimental and modeling studies of a four-trophic level predator-prey system

Transgenerational plasticity of dispersal‐related traits in a ciliate: genotype‐dependency and fitness consequences

Maximum growth rate, size and commonness in a community of bactivorous ciliates

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