Microbial activity usually increases with increase in temperature. In temperate climate, almost no degradation is observed in environments at low temperatures that are typical of the winter season. Little or no degradation is also observed at the beginning and at the end of winter season. In a tropical environment, however, typically the temperature does not fluctuate much and the degradation of toxic chemicals is not much affected. However, in tropical coastal marine environment the microorganisms have shown little tolerance for temperature fluctuations. In frozen soils, the toxic chemical persists for long periods due to low metabolic activity of microorganisms.
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