Why does water’s high specific heat reduce temperature changes in inland waters?

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Inland water ecosystem Figure 1: Relationship between the density of pure water and temperature.

Water’s high specific heat means that a relatively large amount of heat energy is required to raise its temperature. Because of this property, water acts as a thermal buffer, resisting significant temperature changes as it gains or loses heat energy.12

In the context of inland water ecosystems, this capacity to absorb and release heat without undergoing rapid temperature shifts allows these bodies of water to moderate seasonal and daily (diurnal) temperature fluctuations. This thermal stability is a critical feature of the environment, as it helps maintain more consistent conditions within the aquatic ecosystem, which in turn influences the physiology and distribution of the organisms living there.13