When transplanted to the fertile environment of the Hudson, exotic and invasive species from other lands often have few predators and spread rapidly. 2). Schmidt, K.A. According to the Daily Freeman, Esopus town supervisor John Coutant really, really doesn't like the Eurasian water chestnut: It causes damage to aquatic environments by shading out native plants, and decreasing the level of oxygen in water. Fellowship Reports of the Hudson River National Estuarine Sanctuary Program, 1985. ‘…the plant community became a virtual monoculture of Trapa (Groth et al 1996)’. See also: Invasive Plant Fact Sheets for plant species (trees, shrubs, vines, herbs and aquatic plants) that have impacted the state's natural lands 1986. The native range of T. natans is from western Europe and Africa to northeast Asia, including eastern Russia and China, and southeast Asia to Indonesia. Currently this invader persists in the Great Lakes basin in Lake Ontario, the southern stretches of Lake Champlain, and numerous countries surrounding the Adirondack Park, like St. Lawrence and Saratoga. Water chestnut (Trapa natans L.) (Fig. The Estuary’s Most [un]Wanted Plant is Under Water Lily Pad? Photo via the Rhode Island Natural History Survey.The town of Esopus has fixed its brand-new water-chestnut-harvesting machine, and is ready to play grim reaper to the ever-present invasive plant that chokes the shallow waters of the Hudson. Credit Andrew C. Revkin The topsy-turvy nature of “nature” in the age of man (a.k.a. Water chestnut can be composted away from the water body. is a fierce competitor in shallow (<5m) waters with soft, muddy bottoms. P. V-1 to V-38 in J.C. Cooper, ed. In: Van Driesche, R., et al., 2002, Biological Control of Invasive Plants in the Eastern United States, USDA Forest Service Publication FHTET-2002-04, 413 p. Pest Status of Weed. Mechanical harvesters are efficient for removing large infestations of water chestnut. The life history of the chrysomelid beetle Pyrrhalta nymphaeae (Galerucinae) on water chestnut, Trapa natans (Hydrocaryaceae), in Tivoli South Bay, Hudson River, NY. Invasive Plants in Pennsylvania: European Water Chestnut (PDF | 107 KB) Pennsylvania Department of Conservation and Natural Resources. water-chestnut This plant can be weedy or invasive according to the authoritative sources noted below.This plant may be known by one or more common names in … 30. Slow-moving sections of the lower Sudbury River (Fairhaven Bay) and Concord River (North Billerica impoundment) do not have as heavy algal and duckweed growth as in the Assabet, but have sections that are overgrown with invasive water chestnut. In the Hudson River, for instance, the plant has replaced water celery (Vallisneria americana ), clasping pondweed (Potamogeton perfoliatus .) However, this method can be quite expensive. Water chestnut is considered an invasive, destructive species, and has been implicated in the loss of many other plant and animal species. By Judy Preston Photography by Jody Dole. Guess Again. It cost the state of Vermont approximately $500,000 to remove water chestnut in 2000. Impact of Introduction: Trapa natans. Great Lakes Nonindigenous Occurrences:. Eurasian water chestnut. A fierce competitor in shallow water, out competing native species (ISSG 2005) and documented as replacing several indigenous submergent species in the Hudson River, USA (Hummel & Kiviat 2004). It’s the Invasive Water Chestnut. Water chestnut can grow in any freshwater setting, from intertidal waters to 12 feet deep, although it prefers nutrient-rich lakes and rivers. Invasive Species in the Hudson River Estuary. ). The aquatic plant known as Trapa natans has the unfortunate common name of water chestnut, leading people who are first hearing about it to think that it may well be a bonus source of that good appetizer, with a strip of bacon wrapped around it. “Devil’s Heads” some people call them, but more properly, they are the fruit of Trapa natans, a plant that has the common name water chestnut. nonindigenous Eurasian watermilfoil (Myriophyllum spicatum . Uncontrolled, it creates nearly impenetrable mats across wide areas of water (Winne 1950; Kiviat 1993). The water chestnut was first introduced to North America in the 1870s, where it is known to have been grown in a botanical garden at Harvard University in 1877. 1), also known as horned water chestnut or water caltrop, is an aquatic weed of the northeastern United States that can dominate ponds, shallow lakes, and river margins (Fig. Mode(s) of Introduction: The water chestnut was intentionally introduced into several ponds at the Cambridge Botanical Garden in Cambridge, Massachusetts by a gardener. An invasive water chestnut taken from the Hudson River has a hitchhiking invasive zebra mussel clinging to a spine (closeup view). European Water Chestnut (Trapa natans) is a floating aquatic annual which is native to Europe, Asia, and tropical Africa.It was introduced to North America as a garden specimen. The plant can grow up to sixteen feet and forms thick mats. Water chestnut has also invaded sections of the Assabet River. 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