Skip to content


Sign of the Times

Sign of the Times

July 30, 2013

A sign stands sentinel in Nauset Estuary on Cape Cod, warning that the estuary is closed because of red tide. Annual springtime red tides, a type of harmful algal bloom, develop in the estuary from the germination of algal cysts found in the sediments. Shellfish consume the algae and accumulate a toxin in their tissues that can sicken people who consume them. WHOI biologist Don Anderson and others in his lab are studying whether cycts buried by re-suspended sediments are less likely to germinate, lessening the severity of the blooms. (Photo by Dave Kulis, Woods Hole Oceanographic Institution)

Image and Visual Licensing

WHOI copyright digital assets (stills and video) contained on this website can be licensed for non-commercial use upon request and approval. Please contact WHOI Digital Assets at or (508) 289-2647.