Dear Alan Kabat and Steve Rosenthal,
Thank you very much for sharing your knowledge. I understand it is a serious threat for land mollusk populations.
The infection on Bonaire is of a relatively recent date and the Dutch Government wants to develop an eradication program. We will try, although it will not be easy.
Kind regards,
Sylvia van Leeuwen
Van: Conchologists List [mailto:[log in to unmask]] Namens steve rosenthal
Verzonden: woensdag 10 april 2024 04:07
Aan: [log in to unmask]
Onderwerp: Re: [CONCH-L] Effect of New Guinea flatworm on molluscs
I know they've pretty much wiped out the Liguus populations at Castellow Hammock (a nature preserve) in Dade County, Florida (SE of Miami).
As of a couple of years ago they supposedly were not in Everglades National Park, but the general description of the places your friend saw decimated snail populations could certainly fit some of the places I see them there.
On Tue, Apr 9, 2024 at 9:20 PM Alan Kabat <[log in to unmask] <mailto:[log in to unmask]> > wrote:
From the Zoological Record, here are three recent papers about this invasive flatworm (and several other invasive species), from the Caribbean and Florida:
Lopez L., et al., 2022. Tree snails in South Florida: ongoing research and conservation concerns. Tentacle, 30: 17-19.
https://www.hawaii.edu/cowielab/Tentacle/Tentacle_30.pdf
Justine, J.-L., et al., 2021. Presence of the invasive land flatworm Platydemus manokwari (Platyhelminthes, Geoplanidae) in Guadeloupe, Martinique and Saint Martin (West Indies). Zootaxa, 4951(2): 381-390.
https://www.mapress.com/zt/article/view/zootaxa.4951.2.11/43386
Brown, M.-D. et al., 2022. First record of exotic terrestrial flatworms (Tricladida: Geoplanidae) Bipalium vagum Jones & Sterrer, 2005 and Dolichoplana striata Moseley, 1877 with confirmation of Platydemus manokwari de Beauchamp, 1963 in Jamaica. BioInvasions Records, 11(2): 373-382.
https://www.reabic.net/journals/bir/2022/2/BIR_2022_Brown_etal.pdf
These papers, and the sources cited, probably will be able to answer your questions -- although I doubt that there is currently any known way of eradicating them that would be effective as opposed to counterproductive.
--Alan Kabat
On Tuesday, April 9, 2024 at 08:18:00 PM EDT, Sylvia op facebook <[log in to unmask] <mailto:[log in to unmask]> > wrote:
Dear Listers,
I found the exotic New Guinean flatworm Platydemus manokwari on the Dutch Caribbean island Bonaire, and I worry because from literature is known that it did serious harm to indigenous terrestrial molluscs on several Pacific islands. Bonaire has a lot of endemic terrestrial species. The same flatworm is reported from Florida and has been occurring there for longer than on Bonaire. Someone visiting Florida recently told me that he found a lot of empty shells of “tree snails with nice colors” (I guess Liguus spec) along the ‘snail trail’ in Florida, filled with “worms” – and he saw nearly no live specimens of the snails. Also he told me that he saw numerous live tree snails only 2 years ago along the same trail. It is just one observation, but it sounds as something to worry about.
Does anyone know more about the effects of this flatworm on terrestrial mollusks in Florida? Are there any publications about this subject? And if they form a threat, is there a way to eradicate them?
I am also aware of the risks to human health, but that is not my question here.
Thank you very much for your help in advance,
Sylvia van Leeuwen
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