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Home»Science»Australia’s pink lakes: The remnants of historical rivers now teeming with microbes that make rosy pigments
Science

Australia’s pink lakes: The remnants of historical rivers now teeming with microbes that make rosy pigments

VernoNewsBy VernoNewsAugust 1, 2025No Comments3 Mins Read
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Australia’s pink lakes: The remnants of historical rivers now teeming with microbes that make rosy pigments
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QUICK FACTS

Identify: Lake Hillier, Pink Lake and others

Location: Western Australia

Coordinates: -34.09487137998776, 123.20277096721424

Why it is unbelievable: Micro organism and microalgae flip these lakes bubblegum-pink.

Australia’s pink lakes are our bodies of water that harbor uncommon, pigment-producing microbes. The lakes are about 10 instances saltier than the ocean, attracting algae and micro organism that churn out beta-carotene — a red-orange pigment that additionally provides carrots, crayfish and flamingos their attribute colours.

Many of the nation’s pink lakes are present in Western Australia, which has round a dozen. The lakes are the remnants of rivers that flowed throughout the panorama greater than 15 million years in the past, which makes them hundreds of years outdated, in accordance with Nationwide Geographic.

As the traditional rivers dried up, pockets of water have been left over and partially evaporated over time, concentrating salt and attracting salt-loving microorganisms similar to Dunaliella salina and Salinibacter ruber — that are single-celled algae and pink micro organism, respectively. D. salina and S. ruber produce beta-carotene when uncovered to daylight, turning the lakes totally different shades of pink relying on salt ranges. Beta-carotene protects these microorganisms from ultraviolet rays and absorbs mild vitality, enabling them to thrive and reproduce, in accordance with Nationwide Geographic.


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However pink lakes are fragile as a result of adjustments in salinity can upset their common inhabitants. Heavy rainfall, for instance, can dilute the lakes’ salt content material to the extent that photosynthetic algae utterly substitute D. salina and S. ruber.

This not too long ago occurred at Lake Hillier on Western Australia’s Center Island, in accordance with ABC Information. Lake Hillier beforehand harbored a big selection of pigment-producing microbes, however excessive rainfall on account of local weather change in 2022 disturbed this group. Consequently, the lake turned from pink to blue-gray — however specialists assume it may recuperate inside the subsequent 10 years if salinity returns to its earlier ranges.

Associated: Lake Natron: The caustic, blood-red lake in Tanzania that turns animals to ‘stone’

Lake Hillier just isn’t the one pink lake to have misplaced its rosy tint. Pink Lake, located close to Esperance in Western Australia, turned blue-gray within the 2000s after a century of salt mining. Salt was extracted to make desk salt, salt licks for livestock, and preservatives for meat and hides, in accordance with Nationwide Geographic. By the early 2000s, there was not sufficient salt left in Pink Lake for species like D. salina and S. ruber to outlive. As photosynthetic algae took over, the change in colour was so dramatic that locals lobbied for the lake to be renamed.

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Not like Lake Hillier, specialists do not assume that Pink Lake will recuperate naturally any time quickly — however scientists have steered artificially pumping salt from close by salt lakes into Pink Lake to return it to pre-mining ranges.

Pink lakes are feeding grounds for nomadic and migratory birds, and so they host invertebrates like brine shrimp and salt lake snails, which makes them useful ecosystems. Excessive environments like pink lakes additionally assist scientists to know the potential for all times on Mars.

“They nonetheless produce among the hardest organisms on the planet,” Angus Lawrie, a conservation biologist and analysis affiliate at Curtin College in Australia, instructed Nationwide Geographic.


Uncover extra unbelievable locations, the place we spotlight the unbelievable historical past and science behind among the most dramatic landscapes on Earth.

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