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    A biogeographical profile of the sand cockroach Arenivaga floridensis and its bearing on origin hypotheses for Florida scrub biota

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    Author
    Lamb, Trip; Justice, Teresa C.; Brewer, Michael S.; Moler, Paul E.; Hopkins, Heidi; Bond, Jason E.
    Abstract
    Florida scrub is a xeric ecosystem associated with the peninsula’s sand ridges, whose intermittent Pliocene–Pleistocene isolation is considered key to scrub endemism. One scrub origin hypothesis posits endemics were sourced by the Pliocene dispersal of arid-adapted taxa from southwestern North America; a second invokes Pleistocene migration within eastern North America. Only one study to date has explicitly tested these competing hypotheses, supporting an eastern origin for certain scrub angiosperms. For further perspective, we conducted a genetic analysis of an endemic arthropod, the Florida sand cockroach (Arenivaga floridensis), with two aims: (1) to reconstruct the peninsular colonization and residence history of A. floridensis and (2) determine whether its biogeographic profile favors either origin hypothesis. We sequenced the cox2 mitochondrial gene for 237 specimens (65 populations) as well as additional loci (cox1, nuclear H3) for a subset of Florida roaches and congeners. Using Network and Bayesian inference methods, we identified three major lineages whose genetic differentiation and phylogeographical structure correspond with late Pliocene peninsula insularization, indicating Arenivaga was present and broadly distributed in Florida at that time. Stem and crown divergence estimates (6.36 Ma; 2.78 Ma) between A. floridensis and western sister taxa span a period of extensive dispersal by western biota along an arid Gulf Coast corridor. These phylogeographical and phylogenetic results yield a biogeographic profile consistent with the western origin hypothesis. Moreover, age estimates for the roach’s peninsular residence complement those of several other endemics, favoring a Pliocene (or earlier) inception of the scrub ecosystem. We argue that eastern versus western hypotheses are not mutually exclusive; rather, a composite history of colonization involving disparate biotas better explains the diverse endemism of Florida scrub.
    URI
    http://hdl.handle.net/10342/8374
    Subject
    Arenivaga, dispersal, endemism, Florida platform, Gulf Coast corridor
    Date
    2017-12-11
    Citation:
    APA:
    Lamb, Trip, & Justice, Teresa C., & Brewer, Michael S., & Moler, Paul E., & Hopkins, Heidi, & Bond, Jason E.. (December 2017). A biogeographical profile of the sand cockroach Arenivaga floridensis and its bearing on origin hypotheses for Florida scrub biota. Ecology and Evolution, (8:11), p.5254-5266. Retrieved from http://hdl.handle.net/10342/8374

    Display/Hide MLA, Chicago and APA citation formats.

    MLA:
    Lamb, Trip, and Justice, Teresa C., and Brewer, Michael S., and Moler, Paul E., and Hopkins, Heidi, and Bond, Jason E.. "A biogeographical profile of the sand cockroach Arenivaga floridensis and its bearing on origin hypotheses for Florida scrub biota". Ecology and Evolution. 8:11. (5254-5266.), December 2017. August 11, 2022. http://hdl.handle.net/10342/8374.
    Chicago:
    Lamb, Trip and Justice, Teresa C. and Brewer, Michael S. and Moler, Paul E. and Hopkins, Heidi and Bond, Jason E., "A biogeographical profile of the sand cockroach Arenivaga floridensis and its bearing on origin hypotheses for Florida scrub biota," Ecology and Evolution 8, no. 11 (December 2017), http://hdl.handle.net/10342/8374 (accessed August 11, 2022).
    AMA:
    Lamb, Trip, Justice, Teresa C., Brewer, Michael S., Moler, Paul E., Hopkins, Heidi, Bond, Jason E.. A biogeographical profile of the sand cockroach Arenivaga floridensis and its bearing on origin hypotheses for Florida scrub biota. Ecology and Evolution. December 2017; 8(11) 5254-5266. http://hdl.handle.net/10342/8374. Accessed August 11, 2022.
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