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What makes an ecosystem less stable
- geography
- intermediate
- 11-13
Students pick every change that would reduce the stability of a named ecosystem, from a list mixing three destabilising changes with three stabilising ones. The five variants move round the world's biome bands.
Sample question
Ecologists studying the **Arctic tundra** of northern Canada and Siberia record that **snowy owls** are **down by a half** after an unusually warm summer. <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 420 96" width="420" height="96" role="img" aria-label="Key to the biome band colours"><title>Key to the biome bands</title><rect x="10" y="12" width="26" height="14" fill="#BFDBFE" stroke="currentColor" stroke-width="1"/><text x="44" y="24" font-size="12" fill="currentColor">tundra and ice</text><rect x="10" y="40" width="26" height="14" fill="#86EFAC" stroke="currentColor" stroke-width="1"/><text x="44" y="52" font-size="12" fill="currentColor">temperate forest and grassland</text><rect x="10" y="68" width="26" height="14" fill="#15803D" stroke="currentColor" stroke-width="1"/><text x="44" y="80" font-size="12" fill="currentColor">tropical rainforest</text><rect x="230" y="12" width="26" height="14" fill="#FDE68A" stroke="currentColor" stroke-width="1"/><text x="264" y="24" font-size="12" fill="currentColor">savanna</text><rect x="230" y="40" width="26" height="14" fill="#FCD34D" stroke="currentColor" stroke-width="1"/><text x="264" y="52" font-size="12" fill="currentColor">hot desert</text><rect x="230" y="68" width="26" height="14" fill="none" stroke="#B45309" stroke-width="3"/><text x="264" y="80" font-size="12" fill="currentColor">the biome in this question</text></svg> Select **all** the changes that would make this ecosystem **less** stable.