A Demographic Profile of the Fastest Growing Metazoan: A Strain of Brachionus calyciflorus (Rotifera)

Bennett, William N.; Boraas, Martin E.

doi:10.2307/3565596

Cited by 37 publications

(18 citation statements)

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“…750 days in continuous culture no signs of mixis (mictic females and males) remained. Boraas (1983) and Bennett & Boraas (1989) observed a similar loss of mictic reproduction over time in their B. calyciflorus flowthrough cultures. Boraas (1983) found ca.…”

Section: Discussionmentioning

confidence: 68%

Evolution as a critical component of plankton dynamics

Fussmann

Ellner

Hairston

2003

Proc. R. Soc. Lond. B

128

133

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Microevolution is typically ignored as a factor directly affecting ongoing population dynamics. We show here that density-dependent natural selection has a direct and measurable effect on a planktonic predatorprey interaction. We kept populations of Brachionus calyciflorus, a monogonont rotifer that exhibits cyclical parthenogenesis, in continuous flow-through cultures (chemostats) for more than 900 days. Initially, females frequently produced male offspring, especially at high population densities. We observed rapid evolution, however, towards low propensity to reproduce sexually, and by 750 days, reproduction had become entirely asexual. There was strong selection favouring asexual reproduction because, under the turbulent chemostat regime, males were unable to mate with females, produced no offspring, and so had zero fitness. In replicated chemostat experiments we found that this evolutionary process directly influenced the population dynamics. We observed very specific but reproducible plankton dynamics which are explained well by a mathematical model that explicitly includes evolution. This model accounts for both asexual and sexual reproduction and treats the propensity to reproduce sexually as a quantitative trait under selection. We suggest that a similar amalgam of ecological and evolutionary mechanisms may drive the dynamics of rapidly reproducing organisms in the wild.

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Section: Discussionmentioning

confidence: 68%

Evolution as a critical component of plankton dynamics

Fussmann

Ellner

Hairston

2003

Proc. R. Soc. Lond. B

128

133

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“…The maxima ranged from 1 to 2, but were mostly below 0 .9 . Values for the fastest growing strain of Brachionus calyciflorus (Bennett & Boraas, 1989) also fell within this range .…”

Section: Population Growthmentioning

confidence: 63%

Demography and population growth of Asplanchna girodi (Rotifera) as a function of prey (Anuraeopsis fissa) density

Dumont

Sarma

1995

Hydrobiologia

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Laboratory studies on population growth and life table demography of Asplanchna girodi were conducted at 25±1 °c using Anuraeopsis fissa as prey at four (250, 500, 1000 and 2000 ind ml -1 ) densities . A prey density of 100 ind ml -1 per predator per day did not support A . girodi, while at the highest prey concentration, A . girodi reached a peak of 115±7 ind ml -1 . The age distribution of A. girodi indicated that non-adults constituted about 2/3rd of the population at all prey concentrations . A decrease in prey availability resulted in increased mortality of non-adults . At the highest prey density, the rate of population increase (r) was 1 .51 d -1 . The significance of estimating mortality in population growth studies is discussed .Life table demography of A . girodi was also studied using the same prey at the same concentrations . None of the survivorship parameters (e .g . mean lifespan and mean survivorship) showed a significant relation to prey density . Net reproductive rate and generation time (but not rate of population increase) were affected by prey abundance .

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“…Analogous constraints have been suggested in Drosophila, where species with small body size and fast juvenile development tend to have smaller genomes (Gregory & Johnston, 2008). Monogonont rotifers are among the fastest growing Metazoans, in terms of the intrinsic rate of population increase (Bennett & Boraas, 1989), and rapid juvenile Table 1), except one value for B. plicatilis, which was taken from Welch & Meselson (1998). All genome sizes of Bdelloid rotifers were compiled from previous studies (Pagani et al, 1993;Welch & Meselson, 1998 and embryonic development are major components of this fast growth.…”

Section: Discussionmentioning

confidence: 83%

A first assessment of genome size diversity in Monogonont rotifers

Stelzer

2010

Hydrobiologia

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This study provides the first analysis of genome size diversity in Monogonont rotifers. Measurements were made using flow cytometry, with Drosophila melanogaster and chicken erythrocytes as internal standards. Nuclear DNA content (''2C''-assuming diploid genomes) in eight different species of four different genera ranged almost fourfold, from 0.12 to 0.46 pg. A comparison with previously published values for Bdelloid rotifers suggested that the genomes of Monogononts are significantly smaller than those of Bdelloids. When compared to other Metazoans, Monogonont rotifers seem to have relatively small genomes. For instance, the C-values of the two species with the smallest genomes, Brachionus dimidiatus and Synchaeta pectinata, were only 0.06 and 0.085 pg, respectively. Various explanations for genome size diversity within Monogononta are discussed.

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A Demographic Profile of the Fastest Growing Metazoan: A Strain of Brachionus calyciflorus (Rotifera)

Cited by 37 publications

References 0 publications

Evolution as a critical component of plankton dynamics

Evolution as a critical component of plankton dynamics

Demography and population growth of Asplanchna girodi (Rotifera) as a function of prey (Anuraeopsis fissa) density

A first assessment of genome size diversity in Monogonont rotifers

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