Figure 1.
Map depicting the range of pitcher plant bogs and Exyra semicrocea across the southeastern United States Coastal Plain.
Shaded regions represent historical range while hash marks indicate areas that no longer possess contemporary pitcher plant bog habitats. Sampling locations of Exyra semicrocea populations examined in this study are indicated by stars. The three localities west of the Mississippi River are Angelina National Forest (AN), Big Thicket Nature Preserve (BT), and Kisatchie National Forest (KN). Localities sampled across the eastern portion of the range are Abita Creek Flatwoods Preserve (AC), Grand Bay National Estuarine Research Reserve Site/National Wildlife Refuge (GB), Weeks Bay National Estuarine Research Reserve Site (WB), Conecuh National Forest (CF), Apalachicola National Estuarine Research Reserve Site/National Forest (AP), Okefenokee National Wildlife Preserve (OF), Francis Marion National Forest (FM), and Green Swamp Preserve (GS). Bogs at Centre, Eller Seep, Prattville, and Reed Branch were visited, but no E. semicrocea were located.
Figure 2.
Map and corresponding haplotype networks for the western and eastern lineages of Exyra semicrocea across the southeastern United States Coastal Plain.
Each circle in a network represents a unique mitochondrial DNA (mtDNA) cytochrome c oxidase subunit I (COI) haplotype, with circle size corresponding to haplotype frequency. Rectangles represent the inferred ancestral haplotype or the haplotype with the highest outgroup probability according to the tcs analyses. Each branch, in spite of length, represents one mutational difference between haplotypes, with black circles indicating unsampled (i.e., missing) haplotypes. Colors represent localities designated by matching stars, which correspond to sampling sites specified in Figure 1.
Table 1.
Genetic diversity and neutrality tests for Exyra semicrocea populations across the southeastern United States Coastal Plain.
Table 2.
Measures of genetic differentiation for western populations of Exyra semicrocea in Texas and western Louisiana as estimated by Snn (upper right triangle) and pairwise ΦST (lower triangle) statistics.
Table 3.
Measures of genetic differentiation for eastern populations of Exyra semicrocea as estimated by Snn (upper right triangle) and pairwise ΦST (lower triangle) statistics.
Table 4.
Analyses of molecular variance (AMOVAs) for Exyra semicrocea populations across the southeastern United States Coastal Plain.
Figure 3.
Posterior probability distributions of ongoing migration (M) for Exyra semicrocea populations in the southeastern United States Coastal Plain.
Presented distributions are an average of three independent runs utilizing identical starting conditions but different random seeds from the program mdiv (Nielsen and Wakeley 2001). Migration (M) estimates for pairwise comparisons between A) Weeks Bay (WB) and B) Apalachicola (AP) relative to all other eastern E. semicrocea populations. Colors correspond to those utilized in locality designations of Figure 2.