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An invasive clonal plant benefits from clonal integration more than a co-occurring native plant in nutrient-patchy and competitive environments.

You W, Fan S, Yu D, Xie D, Liu C - PLoS ONE (2014)

Bottom Line: Here, we hypothesize that clonal integration affect growth, photosynthetic performance, biomass allocation and thus competitive ability of invasive and native clonal plants, and invasive clonal plants benefit from clonal integration more than co-occurring native plants in heterogeneous habitats.Moreover, clonal integration increased A. philoxeroides's biomass allocation to roots without competition, but decreased it with competition, especially when the basal ramets were in nutrient-rich sections.These results supported our hypothesis that invasive clonal plants A. philoxeroides benefits from clonal integration more than co-occurring native J. repens, suggesting that the invasiveness of A. philoxeroides may be closely related to clonal integration in heterogeneous environments.

View Article: PubMed Central - PubMed

Affiliation: The National Field Station of Lake Ecosystem of Liangzi Lake, College of Life Science, Wuhan University, Wuhan, P.R. China.

ABSTRACT
Many notorious invasive plants are clonal, however, little is known about the different roles of clonal integration effects between invasive and native plants. Here, we hypothesize that clonal integration affect growth, photosynthetic performance, biomass allocation and thus competitive ability of invasive and native clonal plants, and invasive clonal plants benefit from clonal integration more than co-occurring native plants in heterogeneous habitats. To test these hypotheses, two stoloniferous clonal plants, Alternanthera philoxeroides (invasive), Jussiaea repens (native) were studied in China. The apical parts of both species were grown either with or without neighboring vegetation and the basal parts without competitors were in nutrient- rich or -poor habitats, with stolon connections were either severed or kept intact. Competition significantly reduced growth and photosynthetic performance of the apical ramets in both species, but not the biomass of neighboring vegetation. Without competition, clonal integration greatly improved the growth and photosynthetic performance of both species, especially when the basal parts were in nutrient-rich habitats. When grown with neighboring vegetation, growth of J. repens and photosynthetic performance of both species were significantly enhanced by clonal integration with the basal parts in both nutrient-rich and -poor habitats, while growth and relative neighbor effect (RNE) of A. philoxeroides were greatly improved by clonal integration only when the basal parts were in nutrient-rich habitats. Moreover, clonal integration increased A. philoxeroides's biomass allocation to roots without competition, but decreased it with competition, especially when the basal ramets were in nutrient-rich sections. Effects of clonal integration on biomass allocation of J. repens was similar to that of A. philoxeroides but with less significance. These results supported our hypothesis that invasive clonal plants A. philoxeroides benefits from clonal integration more than co-occurring native J. repens, suggesting that the invasiveness of A. philoxeroides may be closely related to clonal integration in heterogeneous environments.

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Effects of integration treatments on the relative neighbour effect (RNE) of the two clonal plants.The relative neighbour effect (RNE) of the invasive plant A. philoxeroides and native plant J. repens in the apical sections in three integration treatments. Data indicate the means ± SE. Bars sharing the same letter are not significantly different at P = 0.05.
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pone-0097246-g003: Effects of integration treatments on the relative neighbour effect (RNE) of the two clonal plants.The relative neighbour effect (RNE) of the invasive plant A. philoxeroides and native plant J. repens in the apical sections in three integration treatments. Data indicate the means ± SE. Bars sharing the same letter are not significantly different at P = 0.05.

Mentions: Integration treatments (severed, intact and nutrient) significantly affected the relative neighbor effect (RNE) of the two clonal species in the apical parts (F2,11 = 96.14, P<0.001 for A. philoxeroides; F2,11 = 6.24, P = 0.02 for J. repens). Clonal integration significantly decreased the RNE of A. philoxeroides but greatly increased that in nutrient treatment (Fig. 3). The RNE of J. repens had a decreasing trend with the stolon connection intact and an increasing trend in nutrient treatment but not significantly (Fig. 3).


An invasive clonal plant benefits from clonal integration more than a co-occurring native plant in nutrient-patchy and competitive environments.

You W, Fan S, Yu D, Xie D, Liu C - PLoS ONE (2014)

Effects of integration treatments on the relative neighbour effect (RNE) of the two clonal plants.The relative neighbour effect (RNE) of the invasive plant A. philoxeroides and native plant J. repens in the apical sections in three integration treatments. Data indicate the means ± SE. Bars sharing the same letter are not significantly different at P = 0.05.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4016286&req=5

pone-0097246-g003: Effects of integration treatments on the relative neighbour effect (RNE) of the two clonal plants.The relative neighbour effect (RNE) of the invasive plant A. philoxeroides and native plant J. repens in the apical sections in three integration treatments. Data indicate the means ± SE. Bars sharing the same letter are not significantly different at P = 0.05.
Mentions: Integration treatments (severed, intact and nutrient) significantly affected the relative neighbor effect (RNE) of the two clonal species in the apical parts (F2,11 = 96.14, P<0.001 for A. philoxeroides; F2,11 = 6.24, P = 0.02 for J. repens). Clonal integration significantly decreased the RNE of A. philoxeroides but greatly increased that in nutrient treatment (Fig. 3). The RNE of J. repens had a decreasing trend with the stolon connection intact and an increasing trend in nutrient treatment but not significantly (Fig. 3).

Bottom Line: Here, we hypothesize that clonal integration affect growth, photosynthetic performance, biomass allocation and thus competitive ability of invasive and native clonal plants, and invasive clonal plants benefit from clonal integration more than co-occurring native plants in heterogeneous habitats.Moreover, clonal integration increased A. philoxeroides's biomass allocation to roots without competition, but decreased it with competition, especially when the basal ramets were in nutrient-rich sections.These results supported our hypothesis that invasive clonal plants A. philoxeroides benefits from clonal integration more than co-occurring native J. repens, suggesting that the invasiveness of A. philoxeroides may be closely related to clonal integration in heterogeneous environments.

View Article: PubMed Central - PubMed

Affiliation: The National Field Station of Lake Ecosystem of Liangzi Lake, College of Life Science, Wuhan University, Wuhan, P.R. China.

ABSTRACT
Many notorious invasive plants are clonal, however, little is known about the different roles of clonal integration effects between invasive and native plants. Here, we hypothesize that clonal integration affect growth, photosynthetic performance, biomass allocation and thus competitive ability of invasive and native clonal plants, and invasive clonal plants benefit from clonal integration more than co-occurring native plants in heterogeneous habitats. To test these hypotheses, two stoloniferous clonal plants, Alternanthera philoxeroides (invasive), Jussiaea repens (native) were studied in China. The apical parts of both species were grown either with or without neighboring vegetation and the basal parts without competitors were in nutrient- rich or -poor habitats, with stolon connections were either severed or kept intact. Competition significantly reduced growth and photosynthetic performance of the apical ramets in both species, but not the biomass of neighboring vegetation. Without competition, clonal integration greatly improved the growth and photosynthetic performance of both species, especially when the basal parts were in nutrient-rich habitats. When grown with neighboring vegetation, growth of J. repens and photosynthetic performance of both species were significantly enhanced by clonal integration with the basal parts in both nutrient-rich and -poor habitats, while growth and relative neighbor effect (RNE) of A. philoxeroides were greatly improved by clonal integration only when the basal parts were in nutrient-rich habitats. Moreover, clonal integration increased A. philoxeroides's biomass allocation to roots without competition, but decreased it with competition, especially when the basal ramets were in nutrient-rich sections. Effects of clonal integration on biomass allocation of J. repens was similar to that of A. philoxeroides but with less significance. These results supported our hypothesis that invasive clonal plants A. philoxeroides benefits from clonal integration more than co-occurring native J. repens, suggesting that the invasiveness of A. philoxeroides may be closely related to clonal integration in heterogeneous environments.

Show MeSH
Related in: MedlinePlus