year, they have spread rapidly since. Interestingly, all introduced populations in North America are clonal, meaning they are all genetically identical females. New Zealand mud snail can currently be found in New York State in Lake Ontario and was likely introduced there by the ballast water of ships.This snail was first discovered in Idaho in 1987. Being that a single snail can produce approximately 230 young per
Populations of introduced New Zealand mud snail outcompete other native snail species, reducing biodiversity. Populations can persist at very high densities that alter nutrient flows and has the potential to befoul complex power and water facilities.
Very small, aquatic snail, elongate shell consists of 5 to 6 right-handed
whorls. The shell is light to dark brown. The average length is usually 4-6 mm in introduced locations but may reach 12 mm in its native range.
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