Lesson 3 — Food Webs, Decomposers and a Changing Ecosystem 1 / 6

Last time we made single food chains. But in real life, animals eat lots of different foods! Today we join chains together into a food web.

🌿🔗🐛🔗🐦🔗🦊

Step 1: Most animals eat more than one food, and are eaten by more than one animal.

When we join lots of food chains together, we get a food web — a much more accurate picture of nature.

Step 2: Meet the decomposers — nature's clean-up crew! 🍄🪱

Fungi, worms and bacteria break down dead plants and animals and return their nutrients to the soil.

Producers then use those nutrients to grow — so nothing is wasted.

Step 3: Energy and nutrients keep going around, like a loop.

Producer Consumer Decomposer nutrients return to the soil

Step 4: Some animals belong here (native) and some were brought here by people (introduced).

Native 🦘
numbat, quenda, bobtail, emu

Introduced 🐈
fox, cat, rabbit, cane toad

Introduced animals can break a food web by eating or crowding out native animals.

Your turn! 🕸️

  1. Play the string food-web game — hold the string and feel the web connect.
  2. Sort the native and introduced species cards.
  3. Complete the Food Webs and Decomposers worksheet.

Remember: decomposers return nutrients to the soil, and a web is stronger than a single chain.