Predator–Prey Relationships
Predator and prey populations rise and fall in linked cycles.
About this topic
Predator and prey populations are linked in cycles. When prey is abundant, predators increase; more predators reduce prey; with less food predators decline; then prey recovers. The classic example is the Canadian lynx and snowshoe hare. The predator curve lags behind the prey curve.
Predators regulate prey numbers and keep ecosystems balanced, preventing herbivores from overgrazing. Prey animals have adaptations such as camouflage, speed, warning colours, mimicry, spines and herd behaviour, while predators evolve sharp senses, claws, speed and cooperative hunting. This ongoing evolutionary contest is often called an arms race.
Records of fur trapping in Canada showed hare numbers peaking roughly every ten years, with lynx peaks following a year or two later. When wolves were reintroduced to Yellowstone, elk numbers dropped, willows and aspens regrew along rivers, and beavers and birds returned. This knock-on effect is a trophic cascade.
Predator-prey data are plotted as two linked line graphs. Students often think predators simply eat all the prey, but real populations are limited by many factors, including food supply for the prey and disease. Predators are not always harmful to a species; they often keep the prey population healthier.
Key ideas
- Lynx and hare
- Prey peak first
- Feedback regulates numbers
Quick check
Use cases: where Predator–Prey Relationships helps
- Homework: review the key idea behind Predator–Prey Relationships before you start a problem set.
- Exam revision: use the quick check to test whether you can recall Predator–Prey Relationships without notes.
- Visual learning: play with the interactive lab to see how Predator–Prey Relationships changes when you adjust its inputs.
- Teaching a friend: explain Predator–Prey Relationships in your own words, then compare your version with the key ideas.
Biology underpins medicine, farming, conservation and biotechnology.
Frequently asked questions
What is Predator–Prey Relationships?
Predator and prey populations rise and fall in linked cycles.
What will I learn in Predator–Prey Relationships?
Lynx and hare. Prey peak first. Feedback regulates numbers.
Is Predator–Prey Relationships part of Biology?
Yes. It is one of 150 Biology topics on LearnViz HighSchoolEdu, with 3 key ideas, a live animation and a quick check.
Does the Predator–Prey Relationships lab work on a phone or tablet?
Yes. The animation resizes to fit your screen and supports touch, so you can drag, tap and slide with your finger.
How should I study Predator–Prey Relationships?
Read the summary and key ideas first, play with the interactive lab to see the idea in motion, then answer the quick check. If you get a question wrong, go back to the key idea it tests.
Do I need an account, and is my progress saved?
No account is needed. Marking a topic as learned is saved in your own browser, so it stays on that device and is not sent to a server.