Educator Materials Browse by Topic: Eutrophication   Educator Materials Browse by Topic: Over-harvesting   Educator Materials Browse by Type: Data Analysis   OLogy Card 179 estuaries Estuaries are places where a river meets the sea. This ever-changing ecosystem is bursting with life. Saltwater from the sea, brought... Educator Materials Browse by Type: Worksheets   Educator Materials The Chesapeake Bay Today With Large-scale Fishing Students analyze the food web of today’s Chesapeake Bay with large-scale fishing. Educator Materials Graphing Analysis of Algae and Oysters: Comparing Historic to Modern Day Levels Students graph the oyster and floating algae to sea floor algae ratio levels, and analyze their results on a worksheet. Educator Materials Summary of Activity Worksheet Students summarize what they learned from analyzing historic and present day food webs and data on historic and present day oyster... Blog Post A Historical Tour of Aphrodisiacs with Francine Segan Join Francine Segan on a fascinating tour of aphrodisiacs through history, uncovering cultural and culinary connections. February 1, 2012 Educator Materials Chesapeake Bay Disrupted Food Webs: Exploring the relationship between overfishing and dead zones in the Chesapeake Bay. Educator Materials Videos and Seafood Consumption Choices Students watch two videos about ocean ecosystems, and discuss seafood choices. Video A Message from Mr. Tree Trees provide humans and other animals with oxygen, food, and shelter.