>When you say that the snails may be at risk from Marisa, what exactly do you mean. I know Marisa are herbivores, do you mean they will crowd out the other herbivores?<
Marisa does not always know that it is a herbivore. It will eat eggs and snails, though it does not seem very skilled as a predator. It also poses a threat as a competitor and might carry parasites that could cause problems for native species.
Dr. David Campbell
Old Seashells
University of Alabama
Biodiversity & Systematics
Dept. Biological Sciences
Box 870345
Tuscaloosa, AL 35487-0345 USA
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That is Uncle Joe, taken in the masonic regalia of a Grand Exalted Periwinkle of the Mystic Order of Whelks-P.G. Wodehouse, Romance at Droitgate Spa