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Articles 1 - 8 of 8
Full-Text Articles in Life Sciences
Monitoring Photosynthetic Activity Using In Vivo Chlorophyll A Fluorescence In Microalgae And Cyanobacteria Biofilms In The Nerja Cave (Malaga, Spain), Yolanda Del Rosal, Juan Muñoz-Fernández, Paula S.M. Celis-Plá, Mariona Hernández-Mariné, Félix Álvarez-Gómez, Salvador Merino, Félix L. Figueroa
Monitoring Photosynthetic Activity Using In Vivo Chlorophyll A Fluorescence In Microalgae And Cyanobacteria Biofilms In The Nerja Cave (Malaga, Spain), Yolanda Del Rosal, Juan Muñoz-Fernández, Paula S.M. Celis-Plá, Mariona Hernández-Mariné, Félix Álvarez-Gómez, Salvador Merino, Félix L. Figueroa
International Journal of Speleology
The characterization of the most common photosynthetic biofilms in the Nerja Cave by the continuous monitoring of the in vivo chlorophyll a (Chl a) fluorescence and the incorporation of the irradiance as a new environmental variable related to previous studies in the cave, have allowed us to improve our knowledge about the photosynthetic pattern of the biofilms of the cave. Effective quantum yield (ΔF/Fm′) and relative electron transport rate (rETR) were determined during periods of the light, whereas the maximal quantum yield (Fv /Fm) was determined during dark periods. Increases in …
Environmental Studies Of Cyanobacterial Harmful Algal Blooms Should Include Interactions With The Dynamic Microbiome, Helena L. Pound, Robbie M. Martin, Cody S. Sheik, Morgan M. Steffen, Silvia E. Newell, Gregory J. Dick, R. Michael L. Mckay, George S. Bullerjahn, Steven W. Wilhelm
Environmental Studies Of Cyanobacterial Harmful Algal Blooms Should Include Interactions With The Dynamic Microbiome, Helena L. Pound, Robbie M. Martin, Cody S. Sheik, Morgan M. Steffen, Silvia E. Newell, Gregory J. Dick, R. Michael L. Mckay, George S. Bullerjahn, Steven W. Wilhelm
Great Lakes Institute for Environmental Research Publications
No abstract provided.
Environmental Factors Affecting Chytrid (Chytridiomycota) Infection Rates On Planktothrix Agardhii, Katelyn M. Mckindles, Makayla A. Manes, R. Michael Mckay, Timothy W. Davis, George S. Bullerjahn
Environmental Factors Affecting Chytrid (Chytridiomycota) Infection Rates On Planktothrix Agardhii, Katelyn M. Mckindles, Makayla A. Manes, R. Michael Mckay, Timothy W. Davis, George S. Bullerjahn
Great Lakes Institute for Environmental Research Publications
Planktothrix agardhii dominates the cyanobacterial harmful algal bloom biomass in Sandusky Bay, Lake Erie (USA) from May until September. This filamentous cyanobacterium known parasites including the chytrid fungal species Rhizophydium sp. C02, which was previously isolated from this region. The purpose of our work has been to establish how parasitic interactions affect Planktothrix population dynamics during a bloom event. Samples analyzed from the 2015 to 2019 bloom seasons using quantitative PCR investigate the spatial and temporal prevalence of chytrid infections. Abiotic factors examined in lab include manipulating temperature (17-31°C), conductivity (0.226-1.225 mS/cm) and turbulence. Planktothrix-specific chytrids are present throughout the …
A Stable-Isotope Probing Approach To Modeling Bidirectional Nutrient Exchange In The Microcystis Phycosphere, Malia Gardner
A Stable-Isotope Probing Approach To Modeling Bidirectional Nutrient Exchange In The Microcystis Phycosphere, Malia Gardner
Masters Theses, 2020-current
Cyanobacterial harmful algal blooms (cHABs) plague freshwater systems worldwide and are projected to increase in intensity in the coming decades. cHABs damage aquatic ecosystems by blocking light penetration into the water column, creating hypoxic conditions, and releasing toxins. One of the most prolific cHAB formers is the cosmopolitan genus of cyanobacteria Microcystis. Global climate change and anthropogenic loading of nutrients such as nitrogen (N) and phosphorus (P) fuel Microcystis bloom formation. Increasing global temperatures favor Microcystis because of its high optimal growth temperature. N input is of particular importance for Microcystis because it is unable to fix atmospheric N, …
Ecophysiology Of Toxic Bloom-Forming Cyanobacteria And Their Symbionts, Dominique J. Lockwood
Ecophysiology Of Toxic Bloom-Forming Cyanobacteria And Their Symbionts, Dominique J. Lockwood
Masters Theses, 2020-current
Currently, there is a pernicious microbe in the genus Microcystis that is putting the world’s freshwater resources at risk. A member of the phylum Cyanobacteria, otherwise referred to as blue-green algae, Microcystis forms massive algal blooms in lakes and has the potential to produce a toxin, which does not only harm humans, but also pets, livestock, and aquatic life. As recently as 2016, in the city of Toledo, Ohio, nearly 1 million residents went without clean drinking water for an entire weekend due to one of these Microcystis blooms. However, Microcystis does not only bloom in Ohio. In fact, …
Isolation And Characterization Of Rhizophydiales (Chytridiomycota), Obligate Parasites Of Planktothrix Agardhii In A Laurentian Great Lakes Embayment, Katelyn M. Mckindles, Alejandro N. Jorge, R. Michael Mckay, Timothy W. Davis, George S. Bullerjahna
Isolation And Characterization Of Rhizophydiales (Chytridiomycota), Obligate Parasites Of Planktothrix Agardhii In A Laurentian Great Lakes Embayment, Katelyn M. Mckindles, Alejandro N. Jorge, R. Michael Mckay, Timothy W. Davis, George S. Bullerjahna
Great Lakes Institute for Environmental Research Publications
Planktothrix agardhii dominates the cyanobacterial harmful algal bloom community in Sandusky Bay, Lake Erie (USA), from May through September. This filamentous cyanobacterium is host to a known obligate parasite, the chytrid Rhizophydium sp. During the 2018 bloom season, by utilizing dilution and single-filament isolation techniques, 7 chytrid and 12 P. agardhii strains were isolated from Sandusky Bay. These 7 chytrids and a selection of P. agardhii hosts were then characterized with respect to infection rates. Infections by the isolated chytrids were specific to Planktothrix planktonic species and were not found on other filamentous cyanobacterial taxa present in the bay (Aphanizomenon …
Phylogenetic Placement Of Seven Strains Of Synechococcales (Cyanobacteria) Isolated From Desert Soils In Zion National Park., Kevin Houk
Senior Honors Projects
Seven strains of cyanobacteria of the order Synechococcales were isolated from the sandstone derived soil of Zion National Park. These strains were analyzed using 16S rRNA and 16S-23S phylogenetic analysis, percent dissimilarity of the ITS sequence, morphology, and the similarity of the 16S rRNA sequence. One strain was placed within the genus Plectolyngbya, but the Bayesian inference and 16S rRNA similarity analysis support the conclusion that Plectolyngbya should not considered a valid genus, and that it should be integrated into the taxonomically prioritized Leptolybya. Two of the strains were found to be similar to Phormidesmus morphologically, but the …
When Will Taxonomic Saturation Be Achieved? A Case Study In Nunduva And Kyrtuthrix (Rivulariaceae, Cyanobacteria)1, Jeffrey R. Johansen, Laura Gonzalez-Resendiz, Viviana Escobar-Sanchez, Claudia Segal-Kischinevzky, Jose Martınez-Yerena, Joaquin Hernandez-Sanchez, Gariela Hernandez-Perez, Hilda Leon-Tejera
When Will Taxonomic Saturation Be Achieved? A Case Study In Nunduva And Kyrtuthrix (Rivulariaceae, Cyanobacteria)1, Jeffrey R. Johansen, Laura Gonzalez-Resendiz, Viviana Escobar-Sanchez, Claudia Segal-Kischinevzky, Jose Martınez-Yerena, Joaquin Hernandez-Sanchez, Gariela Hernandez-Perez, Hilda Leon-Tejera
2021 Faculty Bibliography
A number of heterocytous, mat-forming, tapering cyanobacteria in Rivulariaceae have recently been observed in both the Atlantic and Pacific coasts in the rocky intertidal and supratidal zones. These belong to the genera Nunduva, Kyrtuthrix, and Phyllonema and have been the subject of several recent studies. Herein, two new species of Nunduva (N. komarkovae and N. sanagustinensis) and two new species of Kyrtuthrix (K. munecosensis and K. totonaca) are characterized and described from the coasts of Mexico. Genetic separation based on the 16S-23S ITS region was pronounced (>10% in all comparisons). Morphological differences between all existing species in these two …