Assessing the allelopathic effect of invasive phragmites australis on sida hermaphrodita and ammannia robusta; two species at risk in Southern Ontario | The BCIT cIRcuit

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Assessing the allelopathic effect of invasive phragmites australis on sida hermaphrodita and ammannia robusta; two species at risk in Southern Ontario

Stuckless, B. C. (2019). Assessing the allelopathic effect of invasive phragmites australis on sida hermaphrodita and ammannia robusta; two species at risk in Southern Ontario.
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Description

In Ontario, invasive Phragmites australis threatens to displace many species including the endangered species Sida hermaphrodita and Ammannia robusta. Germination and growth assays measured the effect of P. australis aqueous extracts from the leaves, rhizomes, and roots on S. hermaphrodita and A. robusta. Germination was inhibited by some of the treatments, but growth was not. The tissues inhibited germination differently for S. hermaphrodita (leaf> rhizome> root) compared to A. robusta (root> rhizome> leaf) indicating that the allelopathic effect was species-specific. However, the laboratory results show that allelopathic effects are weak. This result is consistent to the field study results showing an increase in S. hermaphrodita area and density over time. Results from this project inform management options by indicating which part of the plant needs to be targeted. In this case, all the tissues had some phytotoxic effects, indicating that biomass may need to be removed or long-term management implemented., Invasive Species, Species at Risk, Seed Germination, Seedling Growth, Allelopathy