Biologists sized up an unlikely natural phenomenon: when parasitism actually causes the number of hosts to increase, an effect known as a hydra effect. A study of common water fleas and their fungal ...

The common water flea, Daphnia pulex, will be used as a model organism to study how genetic function is influenced by manmade environmental stress at a population level in a course on Environmental ...

Life for the common water flea Daphnia must be tough. As a favorite meal choice for aquatic predators, they may need to make some creative morphological or behavioral changes for survival. By ...

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Duluth, Minnesota — On a mild September morning on the aft deck of the research vessel Blue Heron, Donn Branstrator sniffed the contents of a sampling bottle that some graduate students had just ...

In Greek mythology, Hydra was a monstrous water serpent that lived in a swamp and terrorized nearby residents. When intrepid Hercules sliced off one of Hydra’s multiple heads, two more heads grew back ...