| Autor: |
Gillespie, Emily, Madsen-McQueen, Tesa, Eriksson, Torsten, Welz, Allison, Murrell, Zack |
| Předmět: |
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| Zdroj: |
Southeastern Biology; Jan-Dec2021, Vol. 68 Issue 1-4, p43-43, 1/3p |
| Abstrakt: |
Sand myrtle, Kalmia buxifolia (Bergius) Gift & Kron, exhibits a disjunct distribution in eastern North America, ranging from the NJ Pinelands (NJP) to the Sandhills/Cape Fear Arch (SCFA) and westward into the Southern Appalachian Mountains (SAM), with no present-day geographic connection between NJP and southern populations, and very little between the SAM and SCFA populations. This species exhibits considerable morphological variability, leading experts to recognize between one (current consensus) and three species historically. Here, we update efforts to understand the biogeographic history and genetic structure of this species within the context of southeastern biogeography. We developed microsatellite markers using populations from each of the three regions and then applied these markers to a total of 11 populations of Sand myrtle and its closest relative, Kalmia procumbens (L.) Gift, Kron & P. F. Stevens ex Galasso, Banf. & F. Conti and evaluated various measures of population diversity and divergence. We evaluated phylogenetic signal using both chloroplast and nuclear markers and compared this to signals within the microsatellite data. Our updated dataset continues to reveal striking inter-population divergence in the south. Our analyses provides support for the hypothesis that the Cape Fear Arch of the Carolinas was a glacial refugium, from which Sand myrtle migrated northwestward into the SAM and northward into the NJP. Intermittent genetic connectivity between the NJP and SCFA populations appears to have continued for some time, but SAM populations have diverged considerably during the same period, raising new questions about the mechanism of divergence in the mountain populations. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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