Oyster Behavior in the Larval Stage
5E For This Lesson Plan
This activity captures the students' attention, stimulates their thinking, and helps them to access prior knowledge.
1. To use and recognize the value of historical texts as a source of qualitative data. 2. To visualize and gain an understanding of the extraordinary productivity of the Chesapeake Bay ecosystem and its oyster population prior to the modern period. 3. To compare the current decline in the Bay's biodiversity and collapse of oyster populations to historical conditions.
In this section students are given time to think, plan, investigate, collect and organize information.
1. Synthesize various informational sources to understand the current state of the Chesapeake Bay's oyster population (reading for information.)
2. Explore the causes for the collapse of the Bay's oyster population (eg., disease, sedimentation, poor water quality, and overharvesting.) EXTENSION: Higher Level Objectives
3. Explain the consequences of the decline of oyster populations (e.g., economic loss, decreased water-filtering capacity, and an overall decline in biodiversity.)
4. Identify possible solutions.
Students are now involved in an analysis of their own explorations. Their understanding is clarified and modified because of the reflective nature of the activities.
1. Understand the basic stages of development in the oyster's life cycle, from larvae to adult.
2. Identify the names of important larval stages, sizes in microns, and key features of each stage.
3. Analyze information and search for trends in data.
4. See clear diagrams, photographs, and computer images of microscopic larvae.
This section gives students an opportunity to expand and solidify their understanding of the concepts and to apply them in a real-world context.
1. Make qualitative observations of the "swimming behavior" of oyster larvae using authentic laboratory research data.
2. Emphasize the complexity of behavior in microscopic zooplankton.
3. Improve observational skills with repeated trials and interpretive materials (i.e.,"Behavioral Checklist.")
4. Communicate observations in written and diagramatic form.
5. Identify patterns in data and summarize observations.
1. Make quantitative observations of larval behavior using metric units (mm, cm).
2. Calculate "swimming speed" of oyster larvae using the formula for velocity [V = d/t].
3. Identify patterns in data and the influence of variables.
1. To provide a general overview of major oyster studies.
2. To show scientific methods and apparatus -- particularly the Desk-Top Column set-up for the larval behavior studies.
This performance-based activity helps students to connect all of the pieces of information involved in these lessons.
1. To integrate learning and demonstrate understanding of current ecological issues.
2. To argue an issue based on scientific principles and not belief.
3. To apply scientific knowledge to social and economic issues.