At top, Anda Greeney 07 and Suzanne OConnell, associate professor of earth and environmental sciences, prepare to deploy a bathyphotometer, an instrument that measures bioluminescence, into a bay in Vieques, an island off Puerto Rico.At right, Tim Ku, assistant professor of earth and environmental sciences, shows students how to drill a core sample in a bay they are studying. Posted 07/28/06 Ten miles off the east coast of Puerto Rico, on the island of Vieques, three mangrove-lined bays are illuminated with unicellular marine life known as dinoflagellates. One of the bays has an unusually high abundance of these microscopic creatures…