Biology Professor (Twitter: @DrWhitneyHolden) describes the 3 classifications of bacteria based on pH preferences, including acidophiles, neutrophiles, and alkaliphiles. Examples are given of places where you might find each class.,
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Acidophiles are organisms that grow at an optimum pH below 3–4. These are a diverse group of organisms included in archaea, bacteria, fungi, algae, and protozoa growing in acidic conditions, reported from natural environments like solfataric fields, sulfuric pools, and geysers, and artificial environments like areas associated with human activities like mining of coal and metal ores.