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Mutualism-disrupting allelopathic invader drives carbon stress and vital rate decline in a forest perennial herb.

Brouwer NL, Hale AN, Kalisz S - AoB Plants (2015)

Bottom Line: Over a single growing season, the loss of RFS could reduce a plant's photosynthetic physiology and carbon storage.Alliaria-treated plants exhibit significant overall reductions in total non-structural carbohydrates and have 17 % less storage carbohydrates relative to controls.Together, our results are consistent with the hypothesis that disruption of a ubiquitous mutualism following species invasion creates symptoms of carbon stress for species dependent on RFS.

View Article: PubMed Central - PubMed

Affiliation: Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260, USA brouwern@gmail.com.

No MeSH data available.


Related in: MedlinePlus

Effect size of Alliaria removal on the frequency of prolonged vegetative dormancy in Maianthemum before (2003–06; yellow) and after the treatment began (2007–13; black). Calculated with mark-recapture models; error bars represent ± 95 % CIs. Asterisk indicates a significant effect of Alliaria removal (P < 0.05).
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PLV014F5: Effect size of Alliaria removal on the frequency of prolonged vegetative dormancy in Maianthemum before (2003–06; yellow) and after the treatment began (2007–13; black). Calculated with mark-recapture models; error bars represent ± 95 % CIs. Asterisk indicates a significant effect of Alliaria removal (P < 0.05).

Mentions: Dormancy rates were highly variable between years, ranging from <10 to >30 %, but estimated to be lower in the Alliaria removal treatment in six out of 7 years [see Supporting Information—Table S2]. For years prior to the implementation of the Alliaria removal treatment (2003–06) the best-ranked model contains only a year effect (Table 1) while for models of post-treatment years (2007–13) and the entire dataset (2003–13) the best models contain an effect of Alliaria removal, indicating that dormancy rates were typically lower in this treatment. There was an initially large difference in dormancy rates between plots that would be allocated to the two treatments in the first year of the study [see Supporting Information—Table S2], potentially resulting in the model of the pre-treatment years containing an Alliaria removal effect (AICc = 454.6) ranked almost as high as a year-only model (AICc = 452.8). However, since the year-only model has a lower AICc and fewer parameters, the larger model is not considered competitive (Arnold 2010). Moreover, in the other two pre-treatment years (2004 and 2005), there is no difference between dormancy estimates [see Supporting Information—Table S2]. The results of model selection are reinforced by the calculation of average effect sizes for the period prior to Alliaria removal and after removal (Fig. 5). Prior to removal there is no significant difference between dormancy rates (ES = −0.05, CI95% = −0.13–0.03) but after removal dormancy rates are ∼7 % lower than in the Alliaria-ambient treatments (ES = −0.069, CI95% = −0.12 to −0.2).Table 1.


Mutualism-disrupting allelopathic invader drives carbon stress and vital rate decline in a forest perennial herb.

Brouwer NL, Hale AN, Kalisz S - AoB Plants (2015)

Effect size of Alliaria removal on the frequency of prolonged vegetative dormancy in Maianthemum before (2003–06; yellow) and after the treatment began (2007–13; black). Calculated with mark-recapture models; error bars represent ± 95 % CIs. Asterisk indicates a significant effect of Alliaria removal (P < 0.05).
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4374104&req=5

PLV014F5: Effect size of Alliaria removal on the frequency of prolonged vegetative dormancy in Maianthemum before (2003–06; yellow) and after the treatment began (2007–13; black). Calculated with mark-recapture models; error bars represent ± 95 % CIs. Asterisk indicates a significant effect of Alliaria removal (P < 0.05).
Mentions: Dormancy rates were highly variable between years, ranging from <10 to >30 %, but estimated to be lower in the Alliaria removal treatment in six out of 7 years [see Supporting Information—Table S2]. For years prior to the implementation of the Alliaria removal treatment (2003–06) the best-ranked model contains only a year effect (Table 1) while for models of post-treatment years (2007–13) and the entire dataset (2003–13) the best models contain an effect of Alliaria removal, indicating that dormancy rates were typically lower in this treatment. There was an initially large difference in dormancy rates between plots that would be allocated to the two treatments in the first year of the study [see Supporting Information—Table S2], potentially resulting in the model of the pre-treatment years containing an Alliaria removal effect (AICc = 454.6) ranked almost as high as a year-only model (AICc = 452.8). However, since the year-only model has a lower AICc and fewer parameters, the larger model is not considered competitive (Arnold 2010). Moreover, in the other two pre-treatment years (2004 and 2005), there is no difference between dormancy estimates [see Supporting Information—Table S2]. The results of model selection are reinforced by the calculation of average effect sizes for the period prior to Alliaria removal and after removal (Fig. 5). Prior to removal there is no significant difference between dormancy rates (ES = −0.05, CI95% = −0.13–0.03) but after removal dormancy rates are ∼7 % lower than in the Alliaria-ambient treatments (ES = −0.069, CI95% = −0.12 to −0.2).Table 1.

Bottom Line: Over a single growing season, the loss of RFS could reduce a plant's photosynthetic physiology and carbon storage.Alliaria-treated plants exhibit significant overall reductions in total non-structural carbohydrates and have 17 % less storage carbohydrates relative to controls.Together, our results are consistent with the hypothesis that disruption of a ubiquitous mutualism following species invasion creates symptoms of carbon stress for species dependent on RFS.

View Article: PubMed Central - PubMed

Affiliation: Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260, USA brouwern@gmail.com.

No MeSH data available.


Related in: MedlinePlus