1 / 17

Risk Assessment For Invasive Aquatic Plants

Risk Assessment For Invasive Aquatic Plants. Reuben Keller & David Lodge. Presentation to: Invasive Plant Species Assessment Working Group Indianapolis, Nov. 30, 2004. Overview. Invasive aquatic plants in Indiana Impacts Sources Regulations Reducing the impacts

luce
Download Presentation

Risk Assessment For Invasive Aquatic Plants

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Risk Assessment For Invasive Aquatic Plants Reuben Keller & David Lodge Presentation to: Invasive Plant Species Assessment Working Group Indianapolis, Nov. 30, 2004

  2. Overview • Invasive aquatic plants in Indiana • Impacts • Sources • Regulations • Reducing the impacts • Species available through watergarden and aquarium trades • Statistical risk assessment for invasive aquatic plants in the Midwest

  3. Invasion Process Species Elsewhere In Pathway e.g. imported for trade Introduced Reproducing Established Ecological &/or Economic impacts Invasive

  4. Invasive Aquatic Plants In Indiana Purple loosestrife (Lythrum salicaria) is established across IN Eurasian watermilfoil (Myriophyllum spicatum) is established in 175 lakes and reservoirs, and many waterways Curly-leafed pondweed (Potamogeton crispus) ~$803,000 spent each year just on herbicide control More spent on biocontrol Value of lost opportunities (boating, fishing etc.) not estimated

  5. Sources • Watergardening (e.g. purple loosestrife) • Aquariums (e.g. Eurasian watermilfoil, curly-leafed pondweed) • Landscaping, erosion control (e.g. reed canary-grass Phalaris arundinacea)

  6. IN Regulations • Federal noxious weed list (19 species) + Lythrum • Azolla pinnata (mosquito fern) • Caulerpa taxifolia (Mediterranean clone) • Eichornia azurea (anchored waterhyacinth) • Hydrilla verticillata • Hygrophila polysperma (Miramar weed) • Ipomoea aquatica (water spinach) • Lagarosiphon major (Moss) • Limnophila sessiflora (ambulia) • Melaleuca quenquinervia • Monachoria hastata • Monochoria vaginalis • Ottelia alismoides • Sagittaria sagittifolia (arrowhead) • Salvinia auriculata (giant salvinia) • Salvinia biloba (giant salvinia) • Salvinia herzogii (giant salvinia) • Salvinia molesta (giant salvinia) • Solanum tampicense (wetland nightshade) • Sparganium erectum (exotic bur-reed)

  7. Reducing The Impacts Invasion Steps Options Effective? Species Elsewhere × Prevention – exclude species of concern Yes Introduced Insure no propagules can escape cultivation Unlikely Established Unlikely – requires surveys and funds on hand Rapid response - eliminate populations while small Invasive Mitigate damage, control spread, eradicate if possible Eradication usually impossible, control is expensive

  8. Reducing The Impacts Invasion Steps Options Effective? Species Elsewhere Prevention – exclude species of concern Yes Introduced × Insure no propagules can escape cultivation Unlikely Established Unlikely – requires surveys and funds on hand Rapid response - eliminate populations while small Invasive Mitigate damage, control spread, eradicate if possible Eradication usually impossible, control is expensive

  9. Reducing The Impacts Invasion Steps Options Effective? Species Elsewhere Prevention – exclude species of concern Yes Introduced Insure no propagules can escape cultivation Unlikely Established × Unlikely – requires surveys and funds on hand Rapid response - eliminate populations while small Invasive Mitigate damage, control spread, eradicate if possible Eradication usually impossible, control is expensive

  10. Reducing The Impacts Invasion Steps Options Effective? Species Elsewhere Prevention – exclude species of concern Yes Introduced Insure no propagules can escape cultivation Unlikely Established Unlikely – requires surveys and funds on hand Rapid response - eliminate populations while small Invasive Mitigate damage, control spread, eradicate if possible Eradication usually impossible, control is expensive

  11. Summary: Part 1 • Invasive aquatic plants have significant ecological and economic impacts in Indiana • Most are intentionally introduced • Current regulations are inadequate • Preventing introduction is the best way to prevent future impacts

  12. 2. Species Available • What species are available? • Buy and identify organisms • What risks are posed? • Spread of known invaders • Introduction of new invaders

  13. Organisms Purchased

  14. Risks Posed - Plants • Availability of known invasives • 45% of US restricted plants available over web • Eurasian watermilfoil, curly-leafed pondweed, water chestnut and many more invasive, or potentially invasive, species • Misidentifications • 40% of Linnean names incorrect • Ambiguous common names

  15. Contaminants • 5 snail species • 1 crustacean species • 2 insect species • duckweed (Lemna sp.)

  16. Summary: Species Available • Watergarden and aquarium trades are spreading potential and known invaders • Plants are often incorrectly identified by vendors • Plant trade is a vector for the transfer of many contaminant species

  17. Overall Conclusions • Invasive aquatic plant species are a significant economic and ecological problem in Indiana • Preventing introduction is the best way to stop further damages • Many actually or potentially invasive species are being spread through trades • Risk assessment is possible and accurate

More Related