Every few days, the crew of the Challenger would dredge the ocean floor for sediment and specimens. Courtesy of The Trustees of the Natural History Museum. The H.M.S. Challenger spent just over three ...

Plankton are a collection of tiny organisms that live at and beneath the surface of lakes, rivers, ponds, and oceans across the planet. They’re named for the Greek word planktos, meaning to drift or ...

Results from a 2016 research cruise show ocean acidification has interfered with shell development of zooplankton that are a critical part of the marine food web. Shelled pteropods, microscopic ...