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    THE NATURE OF EVOLUTIONARY RADIATIONS WITH A SPECIAL FOCUS ON DEVONIAN CALMONIID TRILOBITES

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    Abe_ku_0099D_11091_DATA_1.pdf (8.661Mb)
    Issue Date
    2010-07-22
    Author
    Abe, Francine Reiko
    Publisher
    University of Kansas
    Format
    124 pages
    Type
    Dissertation
    Degree Level
    Ph.D.
    Discipline
    Ecology & Evolutionary Biology
    Rights
    This item is protected by copyright and unless otherwise specified the copyright of this thesis/dissertation is held by the author.
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    Abstract
    Trilobites were a diverse group of arthropods that left an extensive fossil record which are today used today to study macroevolutionary patterns and processes. A new species and form of olenelloidea trilobites (Nevadella keelensis n. sp. and Esmeraldina rowei) are described from the lower Cambrian Sekwi Formation, Canada. One particular clade of trilobites, the Devonian calmoniid trilobites of the Malvinokaffric Realm, was hailed as a classic paleontological example of an adaptive radiation. Three aspects of the radiation were examined in detail: diversification rates, biogeography, and morphological change. The rates of speciation calculated from stratigraphy were highest when sea level was lowest suggesting causal effect of abiotic factors in speciation. A phylogenetic biogeographic analysis indicated a geographically complex area, and this geographic complexity created various opportunities for speciation via allopatry through sea level changes. The geometric morphometric analysis of morphological change during the radiation did not show a signal of ecological filling. Ultimately, adaptive radiations--including some classic cases--may be caused primarily by abiotic factors of speciation.
    URI
    http://hdl.handle.net/1808/6988
    Collections
    • Dissertations [4472]
    • Ecology & Evolutionary Biology Dissertations and Theses [351]

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    785-864-8983

    KU Libraries
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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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