Unit 2 — October: Aquatic Ecosystems, Water Chemistry, and Natural Resource Management
Description
This unit focuses on aquatic ecosystems, particularly trout and their habitats. Students set up and maintain tanks, learning to test water chemistry (temperature, dissolved oxygen, pH, nitrates, ammonia, etc.) to ensure safe conditions for trout. They study trout reproduction and life cycles through flip books and potential hatchery visits. A major activity involves collecting macroinvertebrates using the Leaf Pack Network method, identifying indicator species, and weighing leaves to measure decomposition. Students examine population dynamics through graphs and carrying capacity models. The unit culminates in natural resource case studies where students propose solutions to real-world management problems and study how organizations communicate resource conservation to the public through various media outlets.
Essential Questions
- What are the physical and chemical conditions necessary for trout and other aquatic organisms to survive?
- How do we use data and indicator species to assess ecosystem health?
- What factors influence population dynamics, and how do ecosystems maintain balance?
- How can we effectively communicate the importance of natural resource management to others?
Learning Objectives
- Test and interpret water chemistry data to determine suitability for aquatic life.
- Identify macroinvertebrate species and use them as bioindicators of water quality.
- Understand trout reproduction, life cycles, and habitat requirements.
- Model and apply concepts of population dynamics and carrying capacity.
- Calculate feed amounts and manage daily feeding for aquatic organisms.
- Analyze case studies in natural resource management and propose evidence-based solutions.
- Evaluate different media strategies for communicating environmental messages.
Supplemental Resources
- Construction paper, markers, and colored pencils for flip books and water quality charts
- Graph paper and calculators for population dynamics and carrying capacity models
- Sticky notes and pocket folders for organizing macroinvertebrate identification data
- Printed word lists and identification guides for macroinvertebrate and water quality terms
Crosscutting Concepts
Disciplinary Core Ideas
Earth and Space Sciences
Engineering, Technology, and Applications of Science
Life Sciences
Science and Engineering Practices
Students read informational texts about agriculture, food systems, natural resources, and animal science, and produce written work including research reports, blog posts, portfolio updates, and writing assignments. Students engage in collaborative discussions, present findings to peers, and cite evidence from multiple sources to support claims across all units.
Students apply mathematical reasoning across units including calculating food costs, feed amounts, percent loss, square footage for coop design, lumber quantities, soil nutrient amounts, population graphs for carrying capacity, and data collection and graphing in macroinvertebrate and plant biodiversity studies.
Students conduct hands-on investigations aligned to life science, earth science, and engineering design standards. Topics include plant cell structure, photosynthesis, cellular respiration, genetics and heredity, animal systems, water chemistry, ecosystems, food webs, population dynamics, natural resource management, DNA extraction, and aquaponics and hydroponics system design.
Students examine the history of agriculture, Native American agricultural practices, the industrial revolution's impact on natural resources, global food production policies, cultural food practices, food insecurity and inequality, and the role of agriculture in economic development across time periods and regions.
Career readiness, financial literacy, and 21st century skills are embedded in every unit. Students explore agricultural careers, practice agribusiness skills including budgeting and record keeping, develop personal and professional skills through FFA activities, and investigate how education and training affect earning potential in agriculture and related fields.
Formative Assessments
- Observations of students conducting water chemistry tests and recording data accurately
- Pair-and-share activities identifying and classifying macroinvertebrates from collected samples
- Journals documenting observations of trout behavior and tank conditions
- Group discussions analyzing real natural resource management cases
Summative Assessment
Projects including water chemistry reports, macroinvertebrate identification portfolios, and blog posts or presentations comparing different media strategies for communicating resource management
Benchmark Assessment
— not configured —
Alternative Assessment
Students may demonstrate understanding of water chemistry through guided data collection with teacher support, verbal explanations of test results instead of written reports, or simplified data recording sheets with visual aids (e.g., color-coded pH scales, labeled diagrams). For macroinvertebrate identification, students may use pre-labeled specimen cards or sorting mats with images and may respond orally to classification questions. Students may present resource management solutions through pictures with captions, a recorded audio explanation, or a simplified poster with teacher-provided sentence frames instead of a written blog post or full presentation.
IEP (Individualized Education Program)
Students may benefit from graphic organizers that support the recording and interpretation of water chemistry data, reducing the cognitive load of tracking multiple variables at once. Providing visual reference charts that pair water quality parameters with images or color-coded ranges can support comprehension during tank monitoring and lab work. For written outputs such as journals or reports, allow oral responses, dictated entries, or partially completed templates so that students can demonstrate understanding of aquatic concepts without being limited by writing demands. Break multi-step processes like macroinvertebrate identification into numbered, visual step sequences, and check in frequently during hands-on work to provide feedback and redirect as needed.
Section 504
Students should be given extended time during water chemistry testing and data recording activities, as the multi-variable nature of the work can be demanding under time pressure. Preferential seating near demonstration areas during tank setup and macroinvertebrate collection activities ensures full access to visual and hands-on instruction. Providing a clean, printed copy of any data tables, identification guides, or directions — rather than requiring students to copy from the board — reduces barriers to participation in lab-based components of the unit.
ELL / MLL
Visual supports are especially important in this unit given the density of science-specific vocabulary; providing illustrated word walls or bilingual glossaries that include terms related to water chemistry, macroinvertebrates, and aquatic ecosystems will help students connect new vocabulary to meaning. Directions for hands-on tasks like water testing or leaf pack collection should be given in short, simple steps accompanied by visual demonstrations, and students should be asked to restate the task in their own words before beginning. Where possible, connect concepts such as water quality and conservation to students' home communities or cultural backgrounds to build relevance and prior knowledge.
At Risk (RTI)
Connecting the unit's concepts to familiar, real-world contexts — such as local waterways, fishing, or drinking water quality — can help students build engagement and activate prior knowledge before encountering more abstract content like carrying capacity or dissolved oxygen. Offering structured data recording templates with partially filled examples gives students a supported entry point into water chemistry work without requiring them to start from a blank page. Hands-on tasks like macroinvertebrate collection and tank maintenance are natural strengths of this unit and should be leveraged as primary learning experiences for students who benefit from concrete, activity-based instruction before moving to analysis or written tasks.
Gifted & Talented
Students can extend their understanding of water chemistry by investigating how multiple parameters interact — for example, exploring how temperature affects dissolved oxygen levels and what that means for trout survival during different seasons. In the natural resource management case studies, students should be encouraged to research real policy decisions, evaluate competing stakeholder perspectives using primary sources, and develop a well-reasoned proposal that addresses environmental, economic, and social trade-offs. The media analysis component offers an opportunity for students to independently investigate how different environmental organizations frame conservation messaging for different audiences, potentially creating their own media piece that applies those communication strategies to a local or regional resource issue.