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Full-Text Articles in Life Sciences
A Biodiversity Survey Of The Soil Crusts Of The Geographically Isolated San Nicholas Island, California, Usa And Description Of Species In Three Genera (Atlanticothix, Pycnacronema, Konicacronema) Previously Restricted To Brazil Using A Polyphasic Approach To Cyanobacterial Taxonomy, Brian Jusko
Masters Theses
San Nicholas Island, California, USA is a geographically-isolated island that experiences a semiarid climate and exhibits significant topographic and geologic diversity. Access to the island is restricted to the public and, as a result, only one previous study has been done on the algal biodiversity of its biological soil crusts. The previous study used morphology as the sole basis of species identification, and it was the aim of this study to corroborate and expand upon the results by including molecular data. Using 16S rRNA and 16S–23S ITS sequences and phylogenetic analyses, a diverse set of taxa were identified and are …
Phylogeny And Taxonomy Of Synechococcus–Like Cyanobacteria, Jiri Komarek, Jeffrey R. Johansen, Jan Smarda, Otakar Strunecký
Phylogeny And Taxonomy Of Synechococcus–Like Cyanobacteria, Jiri Komarek, Jeffrey R. Johansen, Jan Smarda, Otakar Strunecký
2020 Faculty Bibliography
Unicellular cyanobacteria constitute a substantial, ecologically important part of freshwater and marine microflora. Solitary, elongated cyanobacterial cells without apparent slime envelopes and dividing in a single plane perpendicular to the longitudinal axis were traditionally classified into the genus Synechococcus. The type species originates from a freshwater benthic habitat while a number of other Synechococcus–like species were described from diverse environments. Morphologically similar, unicellular populations of “Synechococcus” belong to the most abundant oxygen evolving prokaryotes inhabiting freshwater and oceanic picoplanktic communities. Other species from extreme thermal habitats were described from temperatures over 70 °C. Recent molecular analyses, particularly the 16S rRNA …
Lagosinema Tenuis Gen. Et Sp. Nov. (Prochlorotrichaceae, Cyanobacteria): A New Brackish Water Genus From Tropical Africa, Sandra C. Akagha, Jeffrey R. Johansen, Dike I. Nwankwo, Kedong Yin
Lagosinema Tenuis Gen. Et Sp. Nov. (Prochlorotrichaceae, Cyanobacteria): A New Brackish Water Genus From Tropical Africa, Sandra C. Akagha, Jeffrey R. Johansen, Dike I. Nwankwo, Kedong Yin
2019 Faculty Bibliography
A novel filamentous, nonheterocytous cyanobacterium was isolated from Lagos Lagoon, Nigeria. The isolate was <3.0 μm wide, untapered, with small rounded polar bodies (aerotopes or cyanophycin granules) visible at the crosswalls, and consequently fit the morphological description of Limnothrix planctonica. Although morphologically inseparable from that species, it was molecularly distant from that taxon, with genetic identities between the two taxa ranging 90.73–92.49%, a degree of separation typical of different genera. Both taxa, as well as Limnothrix rosea, are phylogenetically in the Prochlorotrichaceae, distant from the type species of Limnothrix, L. redekei, which is in the Pseudanabaenaceae. The isolate is herein described as Lagosinema tenuis gen. et sp. nov.
Evaluation Of The Phylogenetic Relationships Of The Marine Rivulariaceae., Jose Alberto Martinez Yerena
Evaluation Of The Phylogenetic Relationships Of The Marine Rivulariaceae., Jose Alberto Martinez Yerena
Masters Theses
Historically, the Rivulariaceae family has grouped all heteropolar, tapered and heterocitous Cyanobacteria, however recent description of multiple cyanobacterial populations with this morphotype using 16S rRNA phylogenies have reported that the populations with this morphotype are polyphyletic, and many new and old tapered and heteropolar genera (Cyanomargarita, Gloeothrichia, Rohoaltiella, etc.) have been classified and reclassified to different families than the Rivulariaceae. This is also the case of the main genera of the family (Rivularia and Calothrix), which have been repeatedly reported as polyphyletic, and whose separation to different families has been called for. In this project I carried out the evaluation …
Komarekiella Atlantica Gen. Et Sp. Nov. (Nostocaceae, Cyanobacteria): A New Subaerial Taxon From The Atlantic Rainforest And Kauai, Hawaii, Jeffrey R. Johansen, Guilherme Scotta Hentschke, Nicole Pietrasiak, Janaina Rigonato, Marli F. Fiore, Célia Leite Sant’Anna
Komarekiella Atlantica Gen. Et Sp. Nov. (Nostocaceae, Cyanobacteria): A New Subaerial Taxon From The Atlantic Rainforest And Kauai, Hawaii, Jeffrey R. Johansen, Guilherme Scotta Hentschke, Nicole Pietrasiak, Janaina Rigonato, Marli F. Fiore, Célia Leite Sant’Anna
2017 Faculty Bibliography
Six strains of Cyanobacteria sampled in the Brazilian Atlantic rainforest and one strain from Kauai, Hawaii, were studied using morphological and molecular approaches, including 16S rRNA gene phylogenies and 16S–23S ITS secondary structures, and are herein described as Komarekilla atlantica gen. et sp. nov.. Morphologically they are similar to Nostoc, Desmonostoc, Halotia, and Mojavia and indistinguishable from Chlorogloeopsis. The parsimony and Bayesian phylogenies of the 16S rDNA show that these strains are close to nostocacean strains, in strongly supported clades and separated from all other genera. The secondary structures of the 16S–23S ITS were very consistent between strains of K. …