Dependence between Volumes of Protoplast and Lorica in Lugol-fixed Tintinnid Ciliates

Rychert, Krzysztof

doi:10.1016/j.protis.2010.05.004

Cited by 8 publications

(3 citation statements)

References 14 publications

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“…In cases where the volume was not measured in a study or provided by the authors, estimates were made based upon similar work (Supporting Information Table S1). In tintinnid ciliates, the cell volume was assumed to be 30% of the lorica volume when the former measurement was missing (Gilron and Lynn 1989;Rychert 2011). We used the conversion factor provided by Menden-Deuer and Lessard (2000) to calculate the cell volume from the ciliate carbon content.…”

Section: Data Collectionmentioning

confidence: 99%

Thermal performance of planktonic ciliates differs between marine and freshwaters: A case study providing guidance for climate change studies

Lukić

Limberger

Montagnes

et al. 2022

Limnol Oceanogr Letters

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Predicting the performance of aquatic organisms in a future warmer climate depends critically on understanding how current temperature regimes affect the organisms' growth rates. Using a meta‐analysis for the published experimental data, we calculated the activation energy (Ea) to parameterize the thermal sensitivity of marine and freshwater ciliates, major players in marine and freshwater food webs. We hypothesized that their growth rates increase with temperature but that ciliates dwelling in the immense, thermally stable ocean are closely adapted to their ambient temperature and have lower Ea than ciliates living in smaller, thermally more variable freshwater environments. The Ea was in the range known from other taxa but significantly lower for marine ciliates (0.390 ± 0.105 eV) than for freshwater ciliates (0.633 ± 0.060 eV), supporting our hypothesis. Accordingly, models aiming to predict the ciliate response to increasing water temperature should apply the environment‐specific activation energies provided in this study.

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Section: Data Collectionmentioning

confidence: 99%

Thermal performance of planktonic ciliates differs between marine and freshwaters: A case study providing guidance for climate change studies

Lukić

Limberger

Montagnes

et al. 2022

Limnol Oceanogr Letters

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“…If conversion of units was needed for ciliate cell volume, I used the cell carbon to volume ratio provided by Menden‐Deuer and Lessard (2000) (pg C cell −1 = 0.216 × volume 0.939 ). I converted lorica volume to cell volume for tintinnids, assuming that cells occupied 30% of the lorica (Gilron and Lynn 1989 a ; Rychert 2011). When neither volume, dimensions, or carbon content were reported, I searched the dataset or secondary literature for cell volume of the same species, using preferentially publications by the same authors.…”

Section: Methodsmentioning

confidence: 99%

Physiological mortality of planktonic ciliates: Estimates, causes, and consequences

Weisse

2024

Limnology & Oceanography

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Contrasting physiological mortality with predator‐induced mortality is of tremendous importance for the population dynamics of many organisms but is difficult to assess. This is especially true for tiny organisms, such as most protists, which do not leave any carcasses behind. I performed a meta‐analysis using planktonic ciliates as model organisms to estimate the maximum physiological mortality rates (δmax) across pelagic ecosystems in relation to environmental and biotic factors. The median δmax of planktonic ciliates was 0.62 d−1 and did not differ between marine and freshwater species. Maximum ciliate mortality rates were species‐specific and affected by their specific growth rates (rmax), cell volume, and ability to encyst. Cyst‐forming species had, on average, higher δmax than species unable to encyst. Maximum mortality rates were positively related to rmax, but, in contrast to the latter, δmax appeared unaffected by temperature. I conclude that (1) in the ocean, physiological mortality is more critical for controlling ciliate population size than ciliate losses imposed by microcrustacean predation, but (2) in many lakes, the opposite holds; (3) cyst formation is an effective ciliate trait to cope with the high mortality of motile cells upon starvation. The lack of a temperature effect on δmax deserves further study; if correct, planktonic ciliates may take advantage of rising ocean and lake temperatures, with important implications for the pelagic food web.

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“…Growth rate estimation for tintinnid ciliates (Tintinnidium sp.) was more complicated, because tintinnid loricae are built by protoplasts and the energy allocated for lorica construction has to be taken into account (Rychert 2011;Agatha et al 2013). First, the carbon content of a tintinnid ciliate (CC, pgC), both lorica and protoplast, was calculated from the volume of lorica using the coe cient 0.053 pgC µm -3 (Verity & Langdon 1984;Seuthe et al 2011).…”

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confidence: 99%

Growth rates of common pelagic ciliates in a highly eutrophic lake measured with a modified dilution method

Rychert

2016

Oceanological and Hydrobiological Studies

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The growth rates of ciliates estimated under natural conditions with the widely used size fractionation method are much lower than those observed in cultures. However, recent studies performed with a modified dilution method demonstrated that the size fractionation method underestimates the ciliate growth, because it does not remove predators of the same size as the organisms studied. Thus, it is still unresolved whether ciliates are food-limited in different systems and whether their growth rates are indeed lower than those in cultures. This study was conducted in highly eutrophic Lake Gardno using a modified dilution method. Each time, two dilution experiments were performed (around noon and around midnight). Four small, common ciliates from the genera

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Dependence between Volumes of Protoplast and Lorica in Lugol-fixed Tintinnid Ciliates

Cited by 8 publications

References 14 publications

Thermal performance of planktonic ciliates differs between marine and freshwaters: A case study providing guidance for climate change studies

Thermal performance of planktonic ciliates differs between marine and freshwaters: A case study providing guidance for climate change studies

Physiological mortality of planktonic ciliates: Estimates, causes, and consequences

Growth rates of common pelagic ciliates in a highly eutrophic lake measured with a modified dilution method

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