Maintaining biodiversity and ecosystem services

Standards Alignment

• MS-LS2-5 primary
  Evaluate competing design solutions for maintaining biodiversity and ecosystem services.*

Lesson Overview

This Grade 7 science lesson focuses on evaluating competing design solutions for maintaining biodiversity and ecosystem services. Students engage with models, investigations, and evidence analysis to understand how biodiversity supports ecosystem services such as water purification, nutrient recycling, and soil erosion prevention. The lesson emphasizes scientific reasoning, evaluating trade-offs, and justifying claims based on empirical evidence within the context of interdependent relationships in ecosystems.

Learning Objectives

• Evaluate different design solutions aimed at maintaining biodiversity and ecosystem services by analyzing their scientific, economic, and social considerations.
• Use evidence and scientific reasoning to compare and justify which design solutions best support ecosystem health and human needs.
• Develop and refine explanations about how biodiversity changes affect ecosystem services and human resources.
• Construct arguments supported by data and models regarding the effectiveness of various biodiversity maintenance strategies.

Success Criteria

• Students can identify and describe multiple design solutions for maintaining biodiversity and ecosystem services.
• Students can analyze and compare the benefits and limitations of competing solutions using scientific evidence.
• Students can explain how biodiversity influences ecosystem services and human resources.
• Students can communicate their evaluations clearly, supporting their claims with appropriate evidence and reasoning.

Prerequisite Knowledge

Students should understand basic ecosystem components, including organisms, abiotic factors, and the concept of biodiversity. They should be familiar with ecosystem services and the idea that organisms interact in complex ways that affect ecosystem health.

Key Vocabulary

• Biodiversity
• Ecosystem services
• Design solution
• Evaluation
• Trade-offs
• Water purification
• Nutrient recycling
• Soil erosion prevention
• Scientific reasoning
• Empirical evidence

Materials and Resources

• Data sets or case studies on biodiversity and ecosystem services
• Diagrams or models of ecosystems
• Chart paper or digital tools for organizing information
• Materials for a simple investigation or simulation (optional)

Teacher Preparation

• Review NGSS standard MS-LS2-5 and related performance expectations.
• Prepare or select data sets or case studies illustrating different design solutions for maintaining biodiversity.
• Prepare guiding questions that prompt evaluation of scientific, economic, and social factors.
• Arrange materials for any demonstrations or simulations planned.

Detailed Lesson Notes

Understanding Biodiversity and Ecosystem Services

Biodiversity refers to the variety of living organisms in an ecosystem, including different species, genetic variation, and ecosystems themselves. Ecosystem services are benefits humans receive from ecosystems, such as water purification, nutrient recycling, and soil erosion prevention. Maintaining biodiversity is crucial because it supports these services, which in turn sustain human resources like food, energy, and medicines.

Evaluating Design Solutions

Design solutions to maintain biodiversity can include protected areas, restoration projects, pollution controls, and sustainable resource management. Each solution has constraints and trade-offs that must be considered, including scientific effectiveness, economic costs, and social impacts. Evaluating these solutions involves comparing how well they maintain biodiversity and ecosystem services while considering these constraints.

Scientific Reasoning and Evidence

Students learn to distinguish between facts, reasoned judgments based on research, and speculation. They analyze data and models to assess the effectiveness of different solutions. This includes interpreting patterns, identifying cause-and-effect relationships, and using evidence to support or refute claims about ecosystem health and service maintenance.

Interdependent Relationships in Ecosystems

Ecosystems consist of living organisms interacting with each other and with abiotic factors. Changes in one component can affect others, influencing biodiversity and ecosystem services. Understanding these interdependencies helps students evaluate how design solutions might impact the whole ecosystem and human well-being.

Systematic Evaluation Process

Students apply a systematic process to evaluate competing design solutions: defining criteria and constraints, gathering evidence, modeling outcomes, and making reasoned judgments. This process mirrors scientific and engineering practices and helps students develop critical thinking skills relevant to real-world environmental challenges.

Worked Examples

Classroom Activity

Work in small groups to analyze the data, identify the goals of each design solution, and note any constraints or trade-offs mentioned.

Guided Practice

Independent Practice

1. Foundational: What is biodiversity, and why is it important for ecosystems?
2. Developing: Name two ecosystem services that depend on biodiversity.
3. Application: Describe one design solution that could help maintain biodiversity and explain one possible trade-off of that solution.
4. Analysis: Compare two design solutions for maintaining biodiversity and explain how scientific, economic, and social factors influence their effectiveness.
5. Challenge: Evaluate a design solution that promotes biodiversity but negatively impacts local communities economically. How would you balance these competing needs?

Independent Practice Teacher Answer Key

1. 1. Biodiversity is the variety of living organisms in an ecosystem. It is important because it supports ecosystem health and services like clean water and soil stability.
2. 2. Water purification and nutrient recycling are two ecosystem services that depend on biodiversity.
3. 3. Creating protected wildlife reserves helps maintain biodiversity by limiting human disturbance, but a trade-off could be economic costs or limiting land use for people.
4. 4. One solution might be habitat restoration, which is scientifically effective but costly, while another might be sustainable farming, which balances ecology and economics but may be less protective. Social acceptance affects which solutions can be implemented successfully.
5. 5. Balancing requires considering alternative solutions that support biodiversity while providing economic benefits, involving community input, and possibly combining conservation with sustainable development to meet both ecological and social needs.

Guiding Questions

• What is biodiversity and why is it important?
• How do different design solutions maintain biodiversity?
• What are the trade-offs of each solution?
• How does biodiversity support ecosystem services?
• How can we use evidence to evaluate solutions?

Common Misconceptions

• Biodiversity only means having many different animals, ignoring plants and microorganisms.
• Ecosystem services are always obvious and do not depend on biodiversity.
• One design solution can perfectly solve biodiversity loss without any trade-offs.
• Scientific knowledge alone dictates which design solution should be chosen, ignoring social and economic factors.
• All changes to ecosystems are bad and should be prevented regardless of context.

Differentiation

Assessment

• Observe student participation in group discussions evaluating design solutions.
• Review students' written explanations for use of evidence and reasoning.
• Use questioning during class discussions to probe understanding of trade-offs and ecosystem services.
• Explain one design solution for maintaining biodiversity and one trade-off associated with it.
• Describe how biodiversity supports an ecosystem service important to humans.
• Write an essay evaluating two competing design solutions for maintaining biodiversity, including scientific, economic, and social considerations.
• Create a presentation that argues for the best design solution to maintain ecosystem services in a local ecosystem.

Answer Guide

• What is biodiversity, and why is it important?
  Answer: Biodiversity is the variety of living organisms in an ecosystem, important because it supports ecosystem health and services.
• Name two ecosystem services that depend on biodiversity.
  Answer: Water purification and nutrient recycling.
• Describe one design solution and a trade-off.
  Answer: Protected reserves limit human access to protect biodiversity but may have economic and social costs.
• Compare two design solutions considering scientific, economic, and social factors.
  Answer: Habitat restoration is effective but costly; sustainable farming balances ecology and economics; social acceptance influences success.
• Evaluate a solution that harms local economies but promotes biodiversity.
  Answer: Balance by seeking solutions that support both biodiversity and economic needs, involving community input and sustainable development.

Real-Life Application

Students interview family members or community members about local environmental issues and discuss how biodiversity and ecosystem services might be affected, bringing their findings to class for discussion.

Homework or Home Connection

• Students interview family members or community members about local environmental issues and discuss how biodiversity and ecosystem services might be affected, bringing their findings to class for discussion.

Lesson Summary

In this lesson, students explored the importance of biodiversity and ecosystem services and learned to evaluate competing design solutions for maintaining them. They practiced using scientific evidence and reasoning to compare solutions, considering scientific, economic, and social factors. This process helps students understand the complexity of environmental challenges and prepares them to make informed decisions about ecosystem management.

Teacher Notes

Use the exact standards alignment and retrieved-source provenance stored with this enrichment.

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