Ciliophora

Lynn, Denis H.

doi:10.1007/978-3-319-28149-0_23

Cited by 16 publications

(15 citation statements)

References 116 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ciliates have also previously been detected as a dominant group in sediment core archives from a few lakes (Capo et al 2016, 2017, 2019). Likewise, ciliophora species abundance, diversity and composition have previously been used to indicate and evaluate aquatic ecosystem quality (reviewed in Lynn 2017).…”

Section: Discussionmentioning

confidence: 99%

Evaluating the congruence between DNA‐based and morphological taxonomic approaches in water and sediment trap samples: Analyses of a 36‐month time series from a temperate monomictic lake

Gauthier

Walsh

Selbie

et al. 2021

Limnology & Oceanography

View full text Add to dashboard Cite

Paleolimnological studies are central for identifying long-term changes, yet many studies rely on bioindicators that deposit detectable subfossils in sediments, such as diatoms and cladocerans. Emerging DNA-based approaches are expanding the taxonomic diversity that can be investigated. However, as sedimentary DNA-based approaches are expanding rapidly, calibration work is required to determine the advantages and limitations of these techniques. In this study, we assessed the congruence between morphological and DNA-based approaches applied to sediment trap samples for diatoms and crustaceans using both intracellular and extracellular DNA. We also evaluated which taxa are deposited in sediment traps from the water column to identify potential paleolimnological bioindicators of environmental variations. Based on 18S rRNA gene amplicons, we developed and analyzed a micro-eukaryotic, monthly time series that spanned 3 years and was comprised of paired water column and sediment trap samples from Cultus Lake, British Columbia, Canada. Comparisons of assemblages derived from our genetic and morphological analyses using RV coefficients revealed significant correlations for diatoms, but weaker correlations for crustaceans. Intracellular DNA reads correlated more strongly with diatom morphology, while extracellular DNA reads correlated more strongly with crustacean morphology. Additional analyses of amplicon sequence variants shared between water and sediment trap samples revealed a wide diversity of taxa to study in paleolimnology, including Ciliophora, Dinoflagellata, Chytridiomycota, Chrysophyceae, and Cryptophyceae. Partial RDAs identified significant environmental predictors of these shared assemblages. Overall, our study demonstrates the effectiveness of DNA-based approaches to track community dynamics from sediment samples, an essential step for successful paleolimnological studies.

show abstract

Section: Discussionmentioning

confidence: 99%

Evaluating the congruence between DNA‐based and morphological taxonomic approaches in water and sediment trap samples: Analyses of a 36‐month time series from a temperate monomictic lake

Gauthier

Walsh

Selbie

et al. 2021

Limnology & Oceanography

View full text Add to dashboard Cite

show abstract

“…record which along with 19 other ASVs grouped within the class Oligohymenophorea, a species‐rich but undersequenced group of ciliates (Sun et al ., 2021). To the best of our knowledge, there are no records of cave endemic Tetrahymena , Choreotrichia , or Peritrichia but their lifestyles and physiology (Lynn, 2017) would be suitable to life in a lightless environment as long as there are sufficient numbers of prokaryotic and microeukaryotic prey available…”

Section: Resultsmentioning

confidence: 99%

Alveolates (dinoflagellates, ciliates and apicomplexans) and Rhizarians are the most common microbial eukaryotes in temperate Appalachian karst caves

Cahoon

VanGundy

2022

Environ Microbiol Rep

View full text Add to dashboard Cite

The purpose of this study was to survey the eukaryotic microbiome of two karst caves in the Valley and Ridge physiographic region of the Appalachian Mountains. Caves are known to harbour eukaryotic microbes but their very low densities and small cell size make them difficult to collect and identify. Microeukaryotes were surveyed using two methodologies, filtering water and submerging glass microscope slides mounted in periphytometers in cave pools. The periphyton sampling yielded 13.5 times more unique amplicon sequence variants (ASVs) than filtered water. The most abundant protist supergroup was Alveolata with large proportions of the ASVs belonging to dinoflagellate, ciliate and apicomplexan clades. The next most abundant were Rhizarians followed by Stramenopiles (diatoms and chrysophytes) and Ameobozoans. Very few of the ASVs, 1.5%, matched curated protist sequences with greater than 99% identity and only 2.5% could be identified from surface plankton samples collected in the same region. The overall composition of the eukaryotic microbiome appears to be a combination of bacterial grazers and parasitic species that could possibly survive underground as well as cells, cysts and spores probably transported from the surface.

show abstract

“…The fact that the monokinetids have the same structure than the posterior dikinetidal basal bodies further strengthens the kinetid transformation hypothesis established by Agatha and Strüder‐Kypke (2014). The overlapping postciliary ribbons of tintinnids differ from the ‘true’ postciliodesmata in the Postciliodesmatophora as defined by Lynn (2008, 2017) due to the absence of microtubules linking the particular ribbons.…”

Section: Discussionmentioning

confidence: 96%

“…The ultrastructure of somatic kinetids is generally considered a rather conservative feature in ciliates allowing the characterisation of higher systematic ranks (Lynn, 1981; Lynn & Small, 2000; Small & Lynn, 1981, 1985); molecular phylogenies actually confirmed most of these taxa (Lynn, 2017). According to Adl et al (2019), the spirotrich ciliates comprise the licnophorids, kiitrichids, euplotids, hypotrichs, oligotrichids, and choreotrichids; the latter three taxa are united in the Perilemmaphora based on the shared possession of a perilemma, an additional membranous structure embracing the cell.…”

Section: Taxon Kinetid Structure Referencesmentioning

confidence: 99%

“…The oligotrichids and choreotrichids are adelphotaxa, and the latter contain the monophyletic lorica‐forming tintinnids besides aloricate forms; the phylogenetic placement of the enigmatic species Lynnella semiglobulosa is currently uncertain. The sparse ultrastructural data on spirotrichs, however, contradict the structural conservatism of the somatic kinetids (Table 1; Lynn, 2008, 2017). The recent findings on the tintinnid Schmidingerella meunieri even enhanced the previously reported diversity: the somatic kinetids of this ciliate display besides the plesiomorphic features (kinetodesmal fibril, postciliary ribbon, and transverse ribbon) surprising apomorphies, that is, overlapping postciliary ribbons and three extraordinary microtubular ribbons (Gruber et al, 2018).…”

Section: Taxon Kinetid Structure Referencesmentioning

confidence: 99%

See 1 more Smart Citation

Somatic infraciliature in tintinnid ciliates (Alveolata, Ciliophora, Spirotricha): An ultrastructural comparison*

Gruber¹,

Bartel

Weißenbacher

2022

J Eukaryotic Microbiology

View full text Add to dashboard Cite

A recent ultrastructural study on the tintinnid ciliate Schmidingerella meunieri displayed unique types of somatic kinetids. The dikinetids (paired basal bodies) have, besides kinetodesmal fibrils and transverse ribbons, some special features, that is, overlapping postciliary ribbons and three extraordinary microtubular ribbons, which together form a conspicuous network in the ciliated anterior cell portion. The distribution of this feature among tintinnids is studied in chemically fixed and ultrathin‐sectioned specimens from six genera and five families collected in European coastal waters. The taxa are scattered across the molecular tree. Actually, the somatic kinetids of these six genera share the special features discovered in S. meunieri. Accordingly, the overlapping postciliary ribbons and the three extraordinary ribbons were already present in the early stages of tintinnid evolution, namely in the last common ancestor of tintinnids with hard loricae. Owing to the lack of ultrastructural data in the basally branching Tintinnidiidae with their soft loricae and in aloricate choreotrichids other than the aberrant strobilidiids, the first appearance of the structures is still uncertain. The related oligotrichids do not possess overlapping postciliary ribbons, but show electron‐dense material at the sites where the ribbons I–III originate in tintinnids. None of these features is found in any other spirotrich ciliate.

show abstract

Ciliophora

Cited by 16 publications

References 116 publications

Evaluating the congruence between DNA‐based and morphological taxonomic approaches in water and sediment trap samples: Analyses of a 36‐month time series from a temperate monomictic lake

Evaluating the congruence between DNA‐based and morphological taxonomic approaches in water and sediment trap samples: Analyses of a 36‐month time series from a temperate monomictic lake

Alveolates (dinoflagellates, ciliates and apicomplexans) and Rhizarians are the most common microbial eukaryotes in temperate Appalachian karst caves

Somatic infraciliature in tintinnid ciliates (Alveolata, Ciliophora, Spirotricha): An ultrastructural comparison*

Contact Info

Product

Resources

About