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How do alien plants fit in the space-phylogeny matrix?

Procheş Ş, Forest F, Jose S, De Dominicis M, Ramdhani S, Wiggill T - PLoS ONE (2015)

Bottom Line: Recent advances in the field of plant community phylogenetics and invasion phylogenetics are mostly based on plot-level data, which do not take into consideration the spatial arrangement of individual plants within the plot.Here we use within-plot plant coordinates to investigate the link between the physical distance separating plants, and their phylogenetic relatedness.There is no significant relationship between the proportion of alien plants in the plots and the strength of the physical-phylogenetic distance relationship, suggesting that alien plants are well integrated in the local spatial-phylogenetic landscape.

View Article: PubMed Central - PubMed

Affiliation: Discipline of Geography, University of KwaZulu-Natal, Westville Campus, Private Bag X54001, Durban, South Africa.

ABSTRACT
Recent advances in the field of plant community phylogenetics and invasion phylogenetics are mostly based on plot-level data, which do not take into consideration the spatial arrangement of individual plants within the plot. Here we use within-plot plant coordinates to investigate the link between the physical distance separating plants, and their phylogenetic relatedness. We look at two vegetation types (forest and grassland, similar in species richness and in the proportion of alien invasive plants) in subtropical coastal KwaZulu-Natal, South Africa. The relationship between phylogenetic distance and physical distance is weak in grassland (characterised by higher plant densities and low phylogenetic diversity), and varies substantially in forest vegetation (variable plant density, higher phylogenetic diversity). There is no significant relationship between the proportion of alien plants in the plots and the strength of the physical-phylogenetic distance relationship, suggesting that alien plants are well integrated in the local spatial-phylogenetic landscape.

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Forest-grassland comparisons.The two vegetation types are compared in terms of number of plant species, phylogenetic diversity, representation of alien species, and Mantel test r values (box-and-whisker plots).
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pone.0123238.g001: Forest-grassland comparisons.The two vegetation types are compared in terms of number of plant species, phylogenetic diversity, representation of alien species, and Mantel test r values (box-and-whisker plots).

Mentions: Phylogenetic diversity values range from 1341 Ma to 2321 Ma for forest plots and from 925 Ma to 1528 Ma for grassland plots. There was no difference between the two vegetation types in terms of species numbers per plot (F = 2.220, P>0.1), but phylogenetic diversity was higher in forest (F = 18.969, P<0.0001); plant density was higher in grassland (F = 14.802, P = 0.001), and there was no difference in the percentage of plants belonging to alien species (F = 2.424, P>0.1) (Fig 1). The randomization procedure identified eight of the ten grasslands plots as clustered. None of the forest plots was clustered, but one of them had higher phylogenetic diversity than expected by chance (over-dispersed). Removing alien species resulted in virtually the same results (one additional grassland plot became clustered), whereas removing grasses had a more substantial effect—in this case several of the otherwise clustered grassland plots were no longer clustered (but four such plots remained), and one forest plot became clustered.


How do alien plants fit in the space-phylogeny matrix?

Procheş Ş, Forest F, Jose S, De Dominicis M, Ramdhani S, Wiggill T - PLoS ONE (2015)

Forest-grassland comparisons.The two vegetation types are compared in terms of number of plant species, phylogenetic diversity, representation of alien species, and Mantel test r values (box-and-whisker plots).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4403803&req=5

pone.0123238.g001: Forest-grassland comparisons.The two vegetation types are compared in terms of number of plant species, phylogenetic diversity, representation of alien species, and Mantel test r values (box-and-whisker plots).
Mentions: Phylogenetic diversity values range from 1341 Ma to 2321 Ma for forest plots and from 925 Ma to 1528 Ma for grassland plots. There was no difference between the two vegetation types in terms of species numbers per plot (F = 2.220, P>0.1), but phylogenetic diversity was higher in forest (F = 18.969, P<0.0001); plant density was higher in grassland (F = 14.802, P = 0.001), and there was no difference in the percentage of plants belonging to alien species (F = 2.424, P>0.1) (Fig 1). The randomization procedure identified eight of the ten grasslands plots as clustered. None of the forest plots was clustered, but one of them had higher phylogenetic diversity than expected by chance (over-dispersed). Removing alien species resulted in virtually the same results (one additional grassland plot became clustered), whereas removing grasses had a more substantial effect—in this case several of the otherwise clustered grassland plots were no longer clustered (but four such plots remained), and one forest plot became clustered.

Bottom Line: Recent advances in the field of plant community phylogenetics and invasion phylogenetics are mostly based on plot-level data, which do not take into consideration the spatial arrangement of individual plants within the plot.Here we use within-plot plant coordinates to investigate the link between the physical distance separating plants, and their phylogenetic relatedness.There is no significant relationship between the proportion of alien plants in the plots and the strength of the physical-phylogenetic distance relationship, suggesting that alien plants are well integrated in the local spatial-phylogenetic landscape.

View Article: PubMed Central - PubMed

Affiliation: Discipline of Geography, University of KwaZulu-Natal, Westville Campus, Private Bag X54001, Durban, South Africa.

ABSTRACT
Recent advances in the field of plant community phylogenetics and invasion phylogenetics are mostly based on plot-level data, which do not take into consideration the spatial arrangement of individual plants within the plot. Here we use within-plot plant coordinates to investigate the link between the physical distance separating plants, and their phylogenetic relatedness. We look at two vegetation types (forest and grassland, similar in species richness and in the proportion of alien invasive plants) in subtropical coastal KwaZulu-Natal, South Africa. The relationship between phylogenetic distance and physical distance is weak in grassland (characterised by higher plant densities and low phylogenetic diversity), and varies substantially in forest vegetation (variable plant density, higher phylogenetic diversity). There is no significant relationship between the proportion of alien plants in the plots and the strength of the physical-phylogenetic distance relationship, suggesting that alien plants are well integrated in the local spatial-phylogenetic landscape.

Show MeSH
Related in: MedlinePlus