An All New Episode of "When Protists Attack!"

Students will define coevolution and explain how it defines the parasite-host relationship.  They will compare it to the Cold War Arms Race.  Perkinsus will be discussed in more detail and it's spread will be mapped.  Students will graph real data on the prevalence of Perkinsus in the Chesapeake and the decline of the oyster population.

Objectives
Students will be able to relate parasite-host coevolution to an arms race in order to describe how Perkinsus marinus has affected the oyster population in the Chesapeake Bay.
Materials
~An introductory video clip or reading on the cold war and the arms race that resulted.
~Perkinsus fact sheets
~ a map of the Chesapeake Bay with room for a key (to map the spread of Perkinsus)
~colored pencils
~data detailing the spread of Perkinsus in the Chesapeake Bay
~ data (over the same time period) about the size of the oyster population in the Chesapeake Bay
~graph paper
Procedure
1.  Show the students a video clip about the Cold War and resulting arms race.  Discuss what an arms race is.  Reintroduce Perkinsus and use the facts sheet to introduce the idea that Perkinsus is on an ongoing evolutionary quest to out-smart the oyster's defenses and kill the oyster.
 
2.  Use Perkinsus prevalance data to map the spread of Dermo disease in the Chesapeake Bay.  Have students color code different areas to indicate the year that Perkinsus was first noticed in that location.
 
3.  Use Perkinsus prevalence data and data documenting the decline of the oyster in the Chesapeake Bay to create a double line graph.  Have students analyze the graph to determine the relationship between the two trends.
References
State Standards
1.1.2- The student will modify or affirm scientific ideas according to accumulated evidence.
1.2.7- The student will use relationships discovered in the lab to explain phenomena observed outside the laboratory.
1.4.1- The student will organize data appropriately using techniques such as tables, graphs, and webs (for graphs: axes labeled with appropriate quantities, appropriate units on axes, axes labeled with appropriate intervals, independent and dependent variables on correct axes, appropriate title).
1.4.2- The student will analyze data to make predictions, decisions, or draw conclusions.
1.4.6- The student will describe trends revealed by data.
1.4.9- The student will use analyzed data to confirm, modify, or reject an hypothesis.
1.5.1- The student will demonstrate the ability to summarize data (measurements/observations).
1.5.4- The student will use tables, graphs, and displays to support arguments and claims in both written and oral communication.
3.5.2- The student will analyze the interrelationships and interdependencies among different organisms and explain how these relationships contribute to the stabilty of the ecosystem.
3.5.3- The student will investigate how natural and man-made changes in environmental conditions will affect individual organisms and the dynamics of populations.
Lesson Resources