From Producers to Predators: Year 9 Dives into Ecosystems and Bioaccumulation

This past term, our Year 9 students took a deep dive into the fascinating world of ‘ecosystems’ and experienced first-hand how energy and substances move through food chains.

Students explored the relationships between producers (like plants and algae) and consumers (such as small fish and large predators) in a hands-on, interactive activity. Rather than just reading from a textbook, students became the food web! Each student took on the role of an organism, ranging from tiny phytoplankton all the way to the mighty shark and moved around the classroom to ‘feed’ on their prey.

But this wasn’t just a game of tag. The twist? Pesticides.

To simulate bioaccumulation, small tokens representing pesticides were passed along as students ‘ate’ one another in the food chain. At first, only a few producers carried pesticides but as the simulation continued, something powerful happened; those toxins built up. By the time the shark had finished its ‘meal’, it had collected all the pesticide tokens.

This demonstration showed students how toxins in an ecosystem, like mercury or pesticides accumulate more and more at each level of the food chain, especially in top predators. This real-world phenomenon, known as bioaccumulation, is a crucial concept in understanding environmental science and the impact of human activity on wildlife and our planet.

By actively participating in this simulation, students gained a deeper, more memorable understanding of how ecosystems work and why environmental responsibility is so important.

Mr Dean

Science Department

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