The spiny water flea
was discovered in the Great Lakes in the mid-1980s, likely introduced as a result of a dumping freighter.
Some well-fed water fleas
were more infectious than others because they were able to survive for longer with the parasite, giving it more time to multiply.
Vanderploeg used sets of paired traps to capture Great Lakes water with similar concentrations of water fleas
and other zooplankters from several sites in Lake Huron.
Named for the insects they resemble, water fleas
are crustaceans that usually filter feed.
"The spiny water flea
, at the present time, wipes out most of the zooplankton in the lake to a depth of greater than five metres," he said.
A water flea
is getting tangled in a hydra's stinging tentacles (left).
Spiny water flea
spores have been identified in ballast-tank residue, and it's possible this is how this and other alien species have found their way into the lakes.
Washington, Feb 09 (ANI): Scientists have discovered that the near-microscopic freshwater crustacean Daphnia pulex, or water flea
is the animal with the most genes, about 31,000.
His team has also studied copper's effect on a tiny water flea
(Daphniapulav)--a crustacean about 2.5 millimeters long--that serves as the bottom rung on many lake-animal food ladders.
Last year, the spiny water flea
(Bythotrephes longimanus), was found in Great Sacandaga Lake in the southern Adirondacks--the first confirmation of this invasive species in a New York water body other than the Great Lakes.
The team saw that water flea
babies were born on schedule but were underdeveloped; some lacked appendages important for swimming, for instance.
In late 1998, for example, the fishhook water flea
(Cercopagis pengoi) appeared for the first time in Lake Ontario.