Population Dynamics
📋 What it is
Populations rise and fall based on food, predators, space, and disease — they rarely stay flat.
🗣️ Coach says
A population is all the members of one species in an area, and it’s always shifting. More food or fewer predators → it grows; less food, more disease, or crowding → it shrinks. Predator and prey numbers even chase each other up and down over time.
🧠 Memory hook
Populations rise and fall with food, predators, space, and disease. Never flat for long.
😂 Giggle
Why was the food chain so well-organized?
Because every link knew its place!
😲 Whoa!
When rabbits were introduced to Australia with no natural predators, their population exploded to the hundreds of millions in just decades.
✅ Quick check: If a predator disappears from an ecosystem, what likely happens to its prey population?
Say your answer out loud first — then reveal.
It tends to grow (at least at first) — with fewer hunters, more prey survive and reproduce.
Predators limit prey numbers; removing them usually lets prey increase.
🧪 Try it! (2 minutes)
Imagine wolves vanish from a forest. Trace what happens to deer, then to the plants the deer eat.