An abiotic factor is a non-living part of an ecosystem that shapes its environment. In a terrestrial ecosystem, examples might include temperature, light, and water. In a marine ecosystem, abiotic factors would include salinity and ocean currents. Abiotic and biotic factors work together to create a unique ecosystem.
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Answer: The VDP ( Vapour Pressure Deficit) of the lizard is lower at night because lower nighttime lizard surface temperatures indicates that there is a lower saturation vapour pressure.
This lower saturation vapour pressure simply implies that there is a lower lizard to air vapour pressure Deficit.(VPD).
So assuming the surface temperature of the lizard is the same as its surrounding air temperature,this means that the rate of water loss from the lizard would be much lower during night because the vapour pressure deficit of the lizard is lower at night.