The Great Salt Lake is separated by a 20-mile (32-kilometer) causeway into a super-salty north arm and a less-salty south arm, with each hosting distinct communities of extremophiles. These organisms mingle at a gap in the causeway, designed to regulate salinity, that has provided microbiologists with an unusual and rich opportunity to study how human activities and weather disturbances affect microbial communities in extreme environments.

The Great Salt Lake is separated by a 20-mile (32-kilometer) causeway into a super-salty north arm and a less-salty south arm, with each hosting distinct communities of extremophiles. These organisms mingle at a gap in the causeway, designed to regulate salinity, that has provided microbiologists with an unusual and rich opportunity to study how human activities and weather disturbances affect microbial communities in extreme environments.

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