this time an aquatic snail is making a big splash out west. After the initial
find in the Grand Canyon in 2002, a subsequent survey found them throughout
most of the Grand Canyon. Although the
snails were identified in California in 2001, older samples from as far back
as 1997 where found to have them but had been misidentified initially as a
native snail. Researchers at Montana State University seem to be finding this
snail nearly everywhere. They have
reported densities as high as 750,000/m2.
Changes since the mudsnails arrival include a decrease in algae
biomass and decrease in caddis flies and mayflies with an increase in
amphipods in one measured site. There are native snails in the region that
most likely will be impacted to some degree by the NZMS.