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Paleobiogeographic Analyses of Late Ordovician Faunal Migrations: Assessing Regional and Continental Pathways and Mechanisms

Lam, Adriane R.
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1428515661

Abstract Details

2015, Master of Science (MS), Ohio University, Geological Sciences (Arts and Sciences).
Late Ordovician strata of the Cincinnati Basin record an invasion during the Richmondian Age. Competing hypotheses exist in the literature about the origin and dispersal routes used by the invasive taxa. In this thesis, a suite of traditional and novel paleobiogeographic methods are used to (1) identify geographic source regions for the invasive taxa, (2) reconstruct dispersal paths used, and (3) analyze speciation patterns that influenced biogeographic evolution of taxa. Parsimony Analysis of Endemicity (PAE) applied to over 60 genera that participated in the invasion interval for the C1-C5 depositional sequences supported multiple dispersal routes within Laurentia and between Laurentia and Baltica. Larval type for invasive taxa was dominantly planktotrophic or planula larvae; both have high dispersal potential. Phylogenetic biogeographic analyses using parsimony and model-based approaches were applied to ten clades of Middle-Late Ordovician taxa to compare ancestral range reconstructions characterized speciation type and identify dispersal paths. Methods recovered similar patterns, but differed when interpreting speciation mode. Based on these analyses and a review of the literature, Richmondian invaders are determined to include taxa from multiple geographic areas. Local and global oceanic currents and changing tectonic factors, promoted the immigration of taxa with high larval dispersal potential into the Cincinnati basin.
Alycia Stigall (Advisor)
Damian Nance (Committee Member)
Dave Kidder (Committee Member)
Greg Springer (Committee Member)
322 p.
Earth; Geology; Paleoclimate Science; Paleoecology; Paleontology
Richmondian Invasion; larvae; dispersal; BioGeoBEARS; parsimony; Parsimony Analysis of Endemicity; Late Ordovician; Laurentia; Baltica

Recommended Citations

Citations

  • Lam, A. R. (2015). Paleobiogeographic Analyses of Late Ordovician Faunal Migrations: Assessing Regional and Continental Pathways and Mechanisms [Master's thesis, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1428515661

    APA Style (7th edition)

  • Lam, Adriane. Paleobiogeographic Analyses of Late Ordovician Faunal Migrations: Assessing Regional and Continental Pathways and Mechanisms. 2015. Ohio University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1428515661.

    MLA Style (8th edition)

  • Lam, Adriane. "Paleobiogeographic Analyses of Late Ordovician Faunal Migrations: Assessing Regional and Continental Pathways and Mechanisms." Master's thesis, Ohio University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1428515661

    Chicago Manual of Style (17th edition)

ohiou1428515661
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© 2015, all rights reserved.
This open access ETD is published by Ohio University and OhioLINK.