Limits...
Genetic admixture and lineage separation in a southern Andean plant

View Article: PubMed Central - PubMed

ABSTRACT

Mountain orogeny has been a major factor in plant evolution in all continents by changing the landscape and climate, creating new habitats and ecological opportunities. In this study we found that diversity in two southern Andean Escallonia species is geographically structured and there is a deep divergence between infraspecific groups that could be associated with ancient evolutionary events like orogeny. We also found evidence of admixture, likely the result of hybridization at the margins of the parental species' distribution range.

No MeSH data available.


(A) Scatter plot of PCs one and two from geometric morphometrics analysis using Elliptic Fourier descriptors for leaves of E. alpina var. alpina (green) and E. alpina var. carmelitana (red). Figures in the background show reconstructions of leaf shape according to each position in the PCs space. (B) Mean shape of leaves assigned to E. alpina var. E. alpina (green) and alpina var. carmelitana (red) according to Elliptic Fourier analysis.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4940511&req=5

plw034-F5: (A) Scatter plot of PCs one and two from geometric morphometrics analysis using Elliptic Fourier descriptors for leaves of E. alpina var. alpina (green) and E. alpina var. carmelitana (red). Figures in the background show reconstructions of leaf shape according to each position in the PCs space. (B) Mean shape of leaves assigned to E. alpina var. E. alpina (green) and alpina var. carmelitana (red) according to Elliptic Fourier analysis.

Mentions: Geometric morphometry further reinforces these observations (Fig. 5A and B); the PCA of the Elliptic Fourier descriptors shows two groups of leaves that correspond to E. alpina var. alpina and E. alpina var. carmelitana, although they are partially overlapped (Fig. 5A). The first two PCs retained 89.7 % of total variation. As seen from the reconstruction of the shapes along the first axis, the major source of leaf outline variation is anisotropy (length to width ratio). The mean leaf shape for each group is shown in Figure 5B. Cross-validation performed over LDA values (using the first nine PCs) was highly successful for both varieties, as 93 % of all leaves was well classified (E. alpina var. alpina 94.4 % and E. alpina var. carmelitana 91.7 %). A MANOVA test also showed significant differences between the two varieties (P < 0.001).Figure 5.


Genetic admixture and lineage separation in a southern Andean plant
(A) Scatter plot of PCs one and two from geometric morphometrics analysis using Elliptic Fourier descriptors for leaves of E. alpina var. alpina (green) and E. alpina var. carmelitana (red). Figures in the background show reconstructions of leaf shape according to each position in the PCs space. (B) Mean shape of leaves assigned to E. alpina var. E. alpina (green) and alpina var. carmelitana (red) according to Elliptic Fourier analysis.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4940511&req=5

plw034-F5: (A) Scatter plot of PCs one and two from geometric morphometrics analysis using Elliptic Fourier descriptors for leaves of E. alpina var. alpina (green) and E. alpina var. carmelitana (red). Figures in the background show reconstructions of leaf shape according to each position in the PCs space. (B) Mean shape of leaves assigned to E. alpina var. E. alpina (green) and alpina var. carmelitana (red) according to Elliptic Fourier analysis.
Mentions: Geometric morphometry further reinforces these observations (Fig. 5A and B); the PCA of the Elliptic Fourier descriptors shows two groups of leaves that correspond to E. alpina var. alpina and E. alpina var. carmelitana, although they are partially overlapped (Fig. 5A). The first two PCs retained 89.7 % of total variation. As seen from the reconstruction of the shapes along the first axis, the major source of leaf outline variation is anisotropy (length to width ratio). The mean leaf shape for each group is shown in Figure 5B. Cross-validation performed over LDA values (using the first nine PCs) was highly successful for both varieties, as 93 % of all leaves was well classified (E. alpina var. alpina 94.4 % and E. alpina var. carmelitana 91.7 %). A MANOVA test also showed significant differences between the two varieties (P < 0.001).Figure 5.

View Article: PubMed Central - PubMed

ABSTRACT

Mountain orogeny has been a major factor in plant evolution in all continents by changing the landscape and climate, creating new habitats and ecological opportunities. In this study we found that diversity in two southern Andean Escallonia species is geographically structured and there is a deep divergence between infraspecific groups that could be associated with ancient evolutionary events like orogeny. We also found evidence of admixture, likely the result of hybridization at the margins of the parental species' distribution range.

No MeSH data available.