Hot Deserts: Biodiversity & Adaptations

Life in a hot desert might seem impossible, but many plants and animals have evolved extraordinary adaptations to survive the extreme heat, minimal water, and intense solar radiation. For AQA GCSE Geography, you need to understand how species have adapted to these conditions and how they interact within the desert ecosystem.

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Biodiversity in Hot Deserts

Compared to tropical rainforests, hot deserts have very low biodiversity. This is because the extreme abiotic conditions — intense heat, minimal rainfall, poor soils — make it extremely difficult for organisms to survive.

Factor	Effect on Biodiversity
Very low rainfall	Water is the most limiting factor; only drought-resistant species survive
Extreme temperatures	Organisms must cope with 50°C+ days and near-freezing nights
Poor, thin soils	Limited nutrients and organic matter to support plant growth
High evaporation rates	Any available water evaporates quickly, intensifying drought stress
Intense solar radiation	UV exposure is very high; organisms need protection from sunburn and overheating