Teacher Monitoring Guide
Grade 8 · Cycle 4 · Week 4 — Food Web Complexity & Stability

Learning Goal

Students will analyze food web diagrams and data to explain how food web complexity relates to ecosystem stability, and construct arguments about the role of redundancy in buffering ecosystems against species loss.

Station Checkpoints

Station 1 — Hook & Phenomenon
Look for: Students connecting the phenomenon to prior knowledge and generating testable questions
Common misconception: More complex food webs are always more stable — introduce the relationship between connectance and stability; very highly connected webs can be more fragile because disturbances spread faster
Station 2 — Investigation / Data Collection
Look for: Accurate data recording and identification of emerging patterns in the evidence
Common misconception: Species at the top of food chains are most important — revisit keystone species concept; basal species (primary producers) and decomposers underpin all other trophic levels
Station 3 — Sense-Making
Look for: Students revising their model based on evidence collected during investigation
Common misconception: Stable ecosystems do not change — distinguish between resistance (buffering disturbance) and resilience (recovering after disturbance) as two dimensions of stability

Exit Ticket Monitoring

Score Range Interpretation Next Step
18–23 pts Meeting target Extend with synthesis question
10–17 pts Developing Small group re-teach at day start
0–9 pts Needs support 1:1 intervention before next station

MTSS Tier 2 Supports

For students scoring below 10 pts on the exit ticket: use the sentence frames below during the next class's hook.