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Full text release has been delayed at the author's request until June 01, 2027

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New Molecular Tools Provide Insights Into Freshwater Red Algae With a Focus on Batrachospermum gelatinosum (Batrachospermales, Rhodophyta)

Crowell, Roseanna M
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1731614679794135

Abstract Details

2024, Doctor of Philosophy (PhD), Ohio University, Plant Biology (Arts and Sciences).
Rapid advancements in genetic methods and bioinformatic tools are leading to broader applications across various organisms and research questions, often becoming more cost effective for non-model species. In this dissertation, I utilize these current genetic resources to achieve three overall goals: (i) test the utility of chloroplast genomic data to infer phylogenetic relationships to fully resolve relationships among genera and add to the growing information about the chloroplast genome characteristics in the Batrachospermales, (ii) assess the genetic variation of across fiver major drainage basins in eastern North America and determine the origin of dispersal of Batrachospermum gelatinosum following the Pleistocene glaciation and (iii) document the bacterial community diversity and composition of Batrachospermum gelatinosum across spatial and temporal scales. Adding eight new chloroplast genomes to the Batrachospermales, I established that chloroplast genomic data provided strong support for relationships among a clade of seven genera. My phylogeographic study of Batrachospermum gelatinosum revealed genetic partitioning among five major drainage basins, with no admixture detected within basins; unexpectedly, genetic diversity did not show a geographic pattern and varied widely across sites, likely due to intragametophytic selfing contributing to reduced genetic diversity in some streams. I found that the origin for B. gelatinosum following the Pleistocene glaciation was likely the Mid-Atlantic, though more sampling is needed to clarify these patterns as intragametophytic selfing likely eroded genetic diversity following these dispersal events, complicating demographic history analysis. Finally, I determined the diversity and composition of the bacterial community associated with B. gelatinosum varied across both spatial and temporal scales. However, much of this variation remains could not be explained by physical and chemical stream conditions measured. Overall, this work provides new insights into the relationships among seven orders Batrachospermales and the population biology and associated bacterial community of B. gelatinosum.
Morgan Vis (Advisor)
Stacy Krueger-Hadfield (Committee Member)
Shawn Kuchta (Committee Member)
John Schenk (Committee Member)
Harvey Ballard (Committee Member)
176 p.
Biology; Freshwater Ecology; Plant Biology
Rhodophyta, algae, freshwater, phylogeography, phylogenomics, bacterial communities

Recommended Citations

Citations

  • Crowell, R. M. (2024). New Molecular Tools Provide Insights Into Freshwater Red Algae With a Focus on Batrachospermum gelatinosum (Batrachospermales, Rhodophyta) [Doctoral dissertation, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1731614679794135

    APA Style (7th edition)

  • Crowell, Roseanna. New Molecular Tools Provide Insights Into Freshwater Red Algae With a Focus on Batrachospermum gelatinosum (Batrachospermales, Rhodophyta). 2024. Ohio University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1731614679794135.

    MLA Style (8th edition)

  • Crowell, Roseanna. "New Molecular Tools Provide Insights Into Freshwater Red Algae With a Focus on Batrachospermum gelatinosum (Batrachospermales, Rhodophyta)." Doctoral dissertation, Ohio University, 2024. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1731614679794135

    Chicago Manual of Style (17th edition)

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© 2024, all rights reserved.
This open access ETD is published by Ohio University and OhioLINK.