Special Issue "Integrated Taxonomy of Protists: Morphology, Genes and Symbionts"

A special issue of Diversity (ISSN 1424-2818). This special issue belongs to the section "Phylogeny and Evolution".

Deadline for manuscript submissions: 30 September 2021.

Special Issue Editors

Dr. Martina Schrallhammer
E-Mail Website
Guest Editor
Albert-Ludwigs Universität Freiburg, Freiburg im Breisgau, Germany
Interests: prokaryotic and eukaryotic symbionts of ciliates; microbial ecology; adaptation; evolution; intracellular bacteria; Paramecium; Rickettsia; Holospora; Caedibacter; Megaira
Special Issues and Collections in MDPI journals
Dr. Alexey Potekhin
E-Mail Website
Guest Editor
Department of Microbiology, Faculty of Biology, Saint Petersburg State University, Saint Petersburg, Russia
Interests: ciliates; Parameciu; protists; symbiosis; bacterial symbionts; microbiomes; mating types; speciation mechanisms; the species concept

Special Issue Information

Dear Colleagues,

We would like to invite you to contribute to this Special Issue of Diversity, entitled “Integrated Taxonomy of Protists: Morphology, Genes, and Symbionts”. Protists, unicellular eukaryotes, are an extremely broad group of organisms revealing the vast diversity of life on our planet. The taxonomy and systematics of protists are, probably, among the most discussed and quickly evolving fields in biology. The species concept in protistology is very complex, and there are no straightforward approaches to solving the numerous problems of taxonomy for different groups of protists. Nowadays, taxonomy cannot be based only on a comparison of the morphology of organisms, neither it is sufficient to establish new taxa only from sequences of marker genes. Modern taxonomy integrates morphological, ultrastructural, and molecular phylogenetic analyses, and also benefits from genomic data. Another way to upgrade the taxonomic sciences would, probably, be the characterization of symbiotic systems. Nowadays, it is broadly accepted that all organisms have symbionts, whether obligatory or occasional. The impact of specific symbionts or microbial consortia (i.e., microbiomes) on the morphology, physiology, development, and ecology of the hosts sometimes may define the specificity and uniqueness of the organisms and drive their evolution. Protists host a great variety of eukaryotic and prokaryotic symbionts, and such associations between unicellular organisms are highly fine-tuned and adaptive. Methodological improvements may facilitate a better understanding of host–symbiont interactions, thus helping us to elucidate basic concepts of Life.

This Special Issue aims to highlight the studies that address the diversity of protists from ecologically peculiar habitats, provide integrative characterization of protist species, or describe symbiotic associations in which protists are involved.

Dr. Martina Schrallhammer
Dr. Alexey Potekhin
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Diversity is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (1 paper)

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Effect of Cothurnia variabilis and Epistylis gammari (Ciliophora: Peritrichia) on Metabolic Rate of the Crayfish Cambarellus (Cambarellus) montezumae
Diversity 2021, 13(7), 333; https://doi.org/10.3390/d13070333 - 19 Jul 2021
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Peritrichs usually settle on the external surface and gills of crustaceans. However, their physiological effect on the host has not been studied. Respiratory rate is a susceptible index for some factors that affect an organism. To test if ciliates attached to the crustacean [...] Read more.
Peritrichs usually settle on the external surface and gills of crustaceans. However, their physiological effect on the host has not been studied. Respiratory rate is a susceptible index for some factors that affect an organism. To test if ciliates attached to the crustacean gills have a physiological effect, we measured crustacean oxygen consumption in a closed system. Crayfish Cambarellus (Cambarellus) montezumae were collected in Lago Xochimilco in Mexico City and were isolated in chambers. Two peritrich species, Cothurnia variabilis (32.5%) and Epistylis gammari (67.5%), were observed on the gills. The metabolic rate was evaluated by oxygen consumption with a polarimetric oximeter. Statistical analyses demonstrated that a density of ciliates attached to the gills of the crayfish above ~50 individuals increased oxygen consumption with a positive correlation to epibiont density. We conclude that C. variabilis and E. gammari ciliate epibionts attached to the gill of the crayfish Cambarellus (Cambarellus) montezumae cause an increase in metabolic rate. Full article
(This article belongs to the Special Issue Integrated Taxonomy of Protists: Morphology, Genes and Symbionts)
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