A study conducted by Haak et al. (2017) aimed to determine the effect of a Bellamya invasion in the reservoirs of the Salt Valley region of Nebraska, USA. The researchers developed dynamic models for 19 of the reservoirs to predict the effects of an invasion. Bellamya were introduced at a set density, (0.0003 t km-2) either with or without a biomass forcing function. The model lacking a forcing function showed a steady or decreasing population density of Bellamya. To contrast, the model including a forcing function found the …show more content…
(2009) studied the response of native snails to a co-invasion by rusty crayfish (Orconectes rusticus) and Bellamya. Outdoor mesocosms, with water chemistry which mirrored that of Sparkling Lake, Wisconsin, USA, were constructed. Over an 8-week period these mesocosms were randomly subjected to one of four treatments; only native snails, native snails and Bellamya, native snails and crayfish, or native snails with crayfish and Bellamya. The invaders were found to have negative effects on native snail abundance with the presence of Bellamya causing a 32% decrease in Lymnaea abundance, and the presence of crayfish causing a 90% decrease, when the invaders were together, the species went extinct. Despite this, the researchers were unsure how this experiment, and its observed effects, would match up to an entire lake ecosystem. Field surveys were recommended as a next step in understanding the invaders (Johnson et al.