Topic
Frontonia
About: Frontonia is a research topic. Over the lifetime, 53 publications have been published within this topic receiving 817 citations.
Papers published on a yearly basis
Papers
TL;DR: It is concluded that the Subclass Peniculia should be divided into two orders, the Order Urocentrida and Order Peniculida, with the latter order having two suborders, the Suborder Frontoniina and PenicULina.
Abstract: Peniculine ciliates have been recognized as a distinct higher taxon of ciliates for almost 50 years. However, phylogenetic relationships within the Subclass Peniculia are still unsettled. To contribute to our understanding of their phylogeny and provide evidence for the position of Urocentrum turbo, we sequenced its small subunit (SS) rRNA gene and the SSrRNA genes from Lembadion bullinum, Frontonia sp., Paramecium caudatum, Paramecium multimicronucleatum, Paramecium putrinum, and Paramecium woodruffi. Urocentrum turbo was the only one of these species not to exhibit a shortened Helix E10_1, which we conclude characterizes the "higher" peniculines. Except for U. turbo, the peniculines are strongly supported as a monophyletic clade with Lembadion, Frontonia, and Paramecium species forming separate and strongly supported clades by bootstrap analysis using distance matrix, maximum parsimony, and maximum likelihood methods. Urocentrum turbo is associated with different lineages, depending upon the analysis used. The Paramecium species form at least four clades with the Paramecium aurelia subgroup being the most derived. We conclude that the Subclass Peniculia should be divided into two orders, the Order Urocentrida and Order Peniculida, with the latter order having two suborders, the Suborder Frontoniina and Peniculina. We place U. turbo with the peniculines because of shared morphological and stomatogenetic features.
84 citations
TL;DR: With the collapse of stratification, Euplotes and Frontonia returned to the sediment where they reverted to a heterotrophic nutrition although they retained some zoochlorellae and Stokesia disappeared, presumably because it encysted.
Abstract: . The spatial distributions of five zoochlorellae-bearing ciliate species (Euplotes daidaleos, Frontonia vernalis, Acaryophrya sp., Disematostoma butschlii, and Stokesia vernalis) were investigated in a productive freshwater pond. The vertical profiles of all species were compared to the levels of O2, CO2, light, temperature, dissolved inorganic nitrogen, and the availability of particulate food sources. In the stratified water column, Stokesia remained close to the water surface: all other species reached peak abundance close to the oxic-anoxic boundary. The latter behavior probably accommodated the ciliates’requirements for aerobic respiration and particulate food and their dependance on the essential resources of light and dissolved nutrients, which came from opposite directions. With the collapse of stratification, Euplotes and Frontonia returned to the sediment where they reverted to a heterotrophic nutrition although they retained some zoochlorellae. Acaryophrya and Disematostoma also became heterotrophic, but they remained evenly distributed in the water column and they lost their zoochlorellae. Stokesia disappeared, presumably because it encysted. There was some evidence for vertical spatial separation of the five species in the water column.
66 citations
TL;DR: Only the coastal infusorial fauna, for the most part mesopsammic, constitutes an extensive biomass with relatively few species, but some are characteristic (Planicoleps psammophilus n.sp).
42 citations
TL;DR: Some nomenclatural rectifications and new combinations in the phylum Ciliophora are suggested and a new species, Zoothamnium asellicola, is proposed for the Carchesium pygmeum Ehrenberg of D'Udekex (1864).
38 citations
TL;DR: The Vertical distributions of two pond-dwelling zoochlorellae-bearing ciliates were monitored over a 24-h period and the O2 tension appears to be the principal factor controlling the vertical distributions of both species.
Abstract: The vertical distributions of two pond-dwelling zoochlorellae-bearing ciliates (Euplotes daidaleos Diller & Kounaris, 1966 and Frontonia vernalis Ehrenberg, 1838) were monitored over a 24-h period. Both species maintained peak abundance at a low O2 level (usually 100, μE m-2 sec-1)- Frontonia suspended in water with a pO2 of 1% aggregated at a low light level (1 μE m-2 sec-1); peak daytime abundance in the pond occurred at about this light level. Frontonia vernalis tends to swim vertically upwards (anterior end up) when suspended in anoxic water. This apparent negative geotaxis compensates for the high sedimentation velocity (0.36 mm sec-1) of this large ciliate and facilitates its aggregation at the metalimnion. The O2 tension appears to be the principal factor controlling the vertical distributions of both species. Occasional, enhanced convection within the metalimnion has a secondary influence. Light influences the vertical profile only if it promotes photosynthesis and increases the intracellular pO2.
37 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 3 |
| 2020 | 1 |
| 2019 | 3 |
| 2018 | 2 |
| 2017 | 1 |
| 2016 | 1 |