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Rapid divergence of ecotypes of an invasive plant.

Ray A, Ray R - AoB Plants (2014)

Bottom Line: We found multiple genetic clusters that were non-randomly distributed across space.In addition, we obtained evidence of inhibitory effects of selection on gene flow, i.e. isolation by environmental distance.Based on a non-random distribution of clusters, unequal gene flow among them and different bioclimatic niche requirements, we concluded that the emergence of ecotypes represented by two genetic clusters is underway.

View Article: PubMed Central - PubMed

Affiliation: National Centre for Biological Sciences, Tata Institute of Fundamental Research, GKVK Campus, Bellary Road, Bangalore 560065, India Present address: Ashoka Trust for Research in Ecology and the Environment (ATREE), Royal Enclave, Sriramapura, Jakkur Post, Bangalore 560064, India, and Center for Interdisciplinary Studies (CIS), Basudha, Kolkata 700078, India avik.ray.kol@gmail.com avik.ray@atree.org.

No MeSH data available.


Maxent predictions of Lantana distributions for (A) the full dataset, (B) Cluster 1 and (C) Cluster 2. The binary distribution has been generated by using a minimum training presence value for the Lantana population (grey shaded areas are suitable for species growth). The niches were modelled using the 10 bioclimatic and five environmental variables.
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PLU052F5: Maxent predictions of Lantana distributions for (A) the full dataset, (B) Cluster 1 and (C) Cluster 2. The binary distribution has been generated by using a minimum training presence value for the Lantana population (grey shaded areas are suitable for species growth). The niches were modelled using the 10 bioclimatic and five environmental variables.

Mentions: The overall niche model has shown Lantana's country-wide distribution, especially in the plain lands, i.e. the Gangetic plains, the foothills of Himalayas, the western and eastern coasts, southern and north-east India. Similarly, the binary distribution map based on minimum training presence values has shown the potential distribution area across the country except for the western desert and the high altitude zones in the Himalayas (Fig. 5A). The AUC of the test data was 0.869, indicating a good fitting of the modelled and current distribution records [see Supporting Information], and model residuals showed weak spatial autocorrelation (Moran's I = 0.0752). The important variables were land cover, altitude and temperature seasonality (as per the jackknife plot for training gain, test gain and AUC). Models based on the genetic cluster data have shown slightly different distribution patterns. The Cluster 1 model (avg. train AUC = 0.965 ± 0.102, Moran's I = −0.1; see Supporting Information) shows high preference towards coastal areas, north-east India and the western Himalayan foothills (Fig. 5B). For the Cluster 2 model (avg. train AUC = 0.924 ± 0.131, Moran's I = −0.125; see Supporting Information), the central and eastern Indian plains were found to be moderate-to-highly suitable (Fig. 5C). However, distribution maps of genetic clusters show high niche similarity (I = 0.9701, D = 0.8108) indicating a near identical distribution pattern.Figure 5.


Rapid divergence of ecotypes of an invasive plant.

Ray A, Ray R - AoB Plants (2014)

Maxent predictions of Lantana distributions for (A) the full dataset, (B) Cluster 1 and (C) Cluster 2. The binary distribution has been generated by using a minimum training presence value for the Lantana population (grey shaded areas are suitable for species growth). The niches were modelled using the 10 bioclimatic and five environmental variables.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4215188&req=5

PLU052F5: Maxent predictions of Lantana distributions for (A) the full dataset, (B) Cluster 1 and (C) Cluster 2. The binary distribution has been generated by using a minimum training presence value for the Lantana population (grey shaded areas are suitable for species growth). The niches were modelled using the 10 bioclimatic and five environmental variables.
Mentions: The overall niche model has shown Lantana's country-wide distribution, especially in the plain lands, i.e. the Gangetic plains, the foothills of Himalayas, the western and eastern coasts, southern and north-east India. Similarly, the binary distribution map based on minimum training presence values has shown the potential distribution area across the country except for the western desert and the high altitude zones in the Himalayas (Fig. 5A). The AUC of the test data was 0.869, indicating a good fitting of the modelled and current distribution records [see Supporting Information], and model residuals showed weak spatial autocorrelation (Moran's I = 0.0752). The important variables were land cover, altitude and temperature seasonality (as per the jackknife plot for training gain, test gain and AUC). Models based on the genetic cluster data have shown slightly different distribution patterns. The Cluster 1 model (avg. train AUC = 0.965 ± 0.102, Moran's I = −0.1; see Supporting Information) shows high preference towards coastal areas, north-east India and the western Himalayan foothills (Fig. 5B). For the Cluster 2 model (avg. train AUC = 0.924 ± 0.131, Moran's I = −0.125; see Supporting Information), the central and eastern Indian plains were found to be moderate-to-highly suitable (Fig. 5C). However, distribution maps of genetic clusters show high niche similarity (I = 0.9701, D = 0.8108) indicating a near identical distribution pattern.Figure 5.

Bottom Line: We found multiple genetic clusters that were non-randomly distributed across space.In addition, we obtained evidence of inhibitory effects of selection on gene flow, i.e. isolation by environmental distance.Based on a non-random distribution of clusters, unequal gene flow among them and different bioclimatic niche requirements, we concluded that the emergence of ecotypes represented by two genetic clusters is underway.

View Article: PubMed Central - PubMed

Affiliation: National Centre for Biological Sciences, Tata Institute of Fundamental Research, GKVK Campus, Bellary Road, Bangalore 560065, India Present address: Ashoka Trust for Research in Ecology and the Environment (ATREE), Royal Enclave, Sriramapura, Jakkur Post, Bangalore 560064, India, and Center for Interdisciplinary Studies (CIS), Basudha, Kolkata 700078, India avik.ray.kol@gmail.com avik.ray@atree.org.

No MeSH data available.