A serial community is like a storybook where each chapter builds upon the previous one. In nature, it's a little like that too!
Imagine that there is a big field with lots of different plants growing in it. These plants don't all grow at the same time - some might start growing in the spring, and others might start growing in the summer.
So when the spring plants start growing, they provide food and shelter for insects and animals that come to live in the field. Then when the summer plants start growing, they provide even more food and shelter for those insects and animals.
This creates a chain reaction, where each new group of plants and animals comes into the community and depends on the things that came before them. So the field starts to change over time, with new plants and animals coming and going as the seasons pass.
Just like a storybook, each chapter of the community depends on the chapters that came before it. And just like a good story, there's always something new and exciting happening in a serial community!