Leslie Massey
Western Australia is home to several pink bodies of water, including the famous Lake Hillier, which is known for its bubblegum pink hue. This unique colour is a result of microorganisms such as Dunaliella salina, a type of algae that thrives in high salt concentrations, and Halobacteria, an extremophile that emits a red pigment. While Lake Hillier is the most well-known, there are other pink lakes in Western Australia, such as Pink Lake (formerly known as Lake Spencer) near Esperance, which has lost its pink colour due to human activity, and other rainbow-hued lakes in the region. These pink lakes are a fascinating natural wonder, attracting tourists and scientists alike to Western Australia.
| Characteristics | Values |
|---|---|
| Number of pink bodies of water in Western Australia | Dozens, around a dozen, or 29 pink lakes around the world |
| Reason for pink colour | Microorganisms such as Dunaliella salina, Salinibacter ruber, Halobacterium cutirubrum, and brine prawn |
| Specific location | Esperance, Middle Island, Cape Arid, Goldfields-Esperance region, Recherche Archipelago |
| Accessibility | Air tours, boat cruises, and road trips |
| Other colours | Pastel pink, sparkling orange, deep red |
| Best time to visit | June to January |
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What You'll Learn
Lake Hillier
The pink colour of Lake Hillier is believed to be due to the presence of the organism Dunaliella salina, a type of red algae that thrives in salty environments. This algae produces beta carotene, a red-orange pigment also found in carrots, crayfish and flamingos, which gives the lake its distinctive hue. In addition to Dunaliella salina, the lake also contains halophilic bacteria, which may be another explanation for its unique colour. These bacteria produce a red dye, which reacts with the salt and sodium bicarbonate in the water to create the pink tint.
In recent years, Lake Hillier's iconic pink colour has noticeably faded, partially due to a high volume of rainfall diluting the lake's salt levels. Climate change and other human threats are killing the pigment-producing microbes that give the lake its distinctive colour. However, scientists believe that the change in appearance is only temporary, and the pink colour is expected to return as water levels decrease. Scenic tours of Lake Hillier are available via aeroplane and boat, but there are no regular services that allow direct access to the lake.
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Esperance's Pink Lake
Esperance, a gorgeous beach town in Western Australia, is home to dozens of vibrantly coloured lakes, ranging from pastel pink to sparkling orange and deep red. Esperance's Pink Lake, formerly known as Lake Spencer, is one of these lakes. While the lake has lost its famous pink hue, it remains a popular tourist attraction.
The unique colour of Pink Lake was the result of a combination of factors, including the presence of the green alga Dunaliella salina, the halobacterium Halobacterium cutirubrum, and a high concentration of brine prawn. The salinity of the lake, which is influenced by external changes and weather conditions, plays a crucial role in its pink colouration. However, due to salinity changes caused by human activity, such as the construction of the South Coast Highway and a rail line, the lake's colour has shifted from pink to a milky white shade.
Despite no longer being pink, Esperance's Pink Lake continues to captivate travellers and locals alike. The lake is located just 2.5 kilometres west of Esperance and is easily accessible from the South Coast Highway. The surrounding area has adopted the name "Pink Lake", with local businesses and accommodation options reflecting this theme. Esperance Pink Lake Tourist Park offers a range of cabin accommodations and sites to suit different traveller needs, making it a convenient base for exploring the lake and other local attractions.
Scenic flights, such as those offered by Fly Esperance, provide a unique perspective of the lake and the surrounding area. These flights allow visitors to witness the striking contrast of the lake's current hue against the crisp white sand and rich blue coastline of Cape Le Grand National Park. The best time to visit Esperance's pink lakes is during the spring, as the dry conditions allow the lakes to fill up with water, creating the ideal environment for the algae to turn pink. However, it is important to note that the lakes may not always appear pink, and the colour can vary depending on the season, time of day, and cloud coverage.
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Why pink lakes occur
There are dozens of pink lakes in Western Australia, ranging from pastel pink to sparkling orange and deep, moody red. The most well-known one is Lake Hillier, located on Middle Island in the Recherche Archipelago off the coast of Esperance.
Pink lakes are a phenomenon that occurs due to a combination of environmental factors, primarily the presence of specific algal and bacterial microorganisms that thrive in high-salinity environments. These microorganisms produce pigments that act as a protective mechanism against the harsh conditions of their habitat. The exact colour of the lake depends on the balance of these organisms, with salt concentration having a direct impact.
The most common type of algae found in pink lakes is Dunaliella salina, which can grow in salinity as high as 35% NaCl (seawater contains around 3% NaCl). This algae accumulates the red carotenoid pigment, beta-carotene, as salinity, temperature, and light increase. The beta-carotene protects the algae from damage by coating the green chlorophyll and giving it an orange/red colour.
In addition to Dunaliella salina, several species of halophilic bacteria have been found in pink lakes, including Halobacterium salinarum (formerly known as Halobacterium cutirubrum). These bacteria are pink in colour and generally grow within the salt crust on the bottom of the lake. While Dunaliella salina was once thought to be the primary cause of pink lakes, recent research has suggested that the red bacterium Salinibacter ruber may be more significant, as it forms a larger percentage of the DNA recovered from the lakes.
The formation and colour of pink lakes are also influenced by external changes and weather conditions, such as climate and hydrology. Warmer weather and lower rainfall can contribute to the pink hue as water evaporates, increasing salinity. However, salinity is not the only factor; sediment and other organisms living in the lake also affect its colour. The delicate organic chemical balance that creates pink lakes may be at risk due to climate change, which can alter precipitation patterns and evaporation rates, impacting salinity levels and the abundance of microorganisms.
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Other pink lakes globally
There are 29 pink lakes discovered around the world, outside of Western Australia. These lakes are scattered across the globe, from Africa to Europe and the Americas. Here are some notable examples:
Lake Retba, Senegal
Lake Retba, located in West Africa, is known for its vibrant pink hue. This lake is often referred to as the "Lake Retba in Senegal" and is home to endangered James flamingos that bask in its pinkish glow. The unique colour of this lake is attributed to the presence of the bacterium Salinibacter ruber, which produces a pigment called bacterioruberin. This pigment aids the bacterium in trapping and utilising light for energy during photosynthesis.
Salinas de Torrevieja, Spain
The Salinas de Torrevieja in Spain is another well-known pink lake. This lake is surrounded by stunning sand dunes and offers a unique visual experience with its contrasting colours.
Pekelmeer, Bonaire
On the Caribbean island of Bonaire, you will find Pekelmeer, a pink lake that provides a beautiful backdrop for nature enthusiasts and photographers alike.
Caño Cristales, Colombia
Although not a pink lake, Colombia's Caño Cristales river deserves an honourable mention. Nicknamed the "Liquid Rainbow" and the "River of Five Colours," this river showcases a profusion of vibrant seasonal hues stemming from its aquatic plant life.
These lakes, along with many others, showcase the diverse and colourful natural wonders found around the globe. Each lake has its unique characteristics, and the pink hue is often a result of a combination of factors, including the presence of specific microorganisms, salinity levels, climate, and hydrology.
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Human threats to pink lakes
Western Australia is home to many pink lakes, including the famous Lake Hillier, which is known for its bright pink hue. However, human activities pose significant threats to these unique ecosystems, endangering the fragile balance that gives rise to their distinctive colouration.
One of the primary human threats to pink lakes is the alteration of water flow and subsequent changes in salinity levels. The construction of infrastructure, such as the South Coast Highway and a rail line near Esperance's Pink Lake, has been linked to reduced water flow into the lake. This, in turn, has affected the lake's salinity, causing it to lose its pink colour. Salt mining has also contributed to the decline in salinity, as seen in the case of Pink Lake, where excessive salt extraction left insufficient salt for the survival of crucial species like D. salina and S. ruber.
Climate change, driven by human activities, is another indirect threat to pink lakes. As global temperatures rise, weather patterns become more erratic, impacting the delicate microbiomes of these lakes. Changes in precipitation and evaporation rates can alter salinity levels, affecting the abundance and distribution of pigment-producing microorganisms. For example, heavy rainfall can dilute salt content, leading to the dominance of photosynthetic algae over D. salina and S. ruber, as observed at Lake Hillier.
Pollution from chemical and industrial waste is another human-induced threat to pink lakes. The discharge of pollutants into the lakes can contaminate the water, disrupting the natural balance of microorganisms and potentially altering the lakes' colouration. Additionally, agricultural runoff containing pesticides and fertilisers can contribute to the pollution of these fragile ecosystems.
The extraction of salt from pink lakes for various industrial and commercial purposes has also been a concern. While salt harvesting may not directly impact the colour of the lakes, it can affect the availability of salt for the microorganisms that thrive in these environments. This, in turn, can disrupt the natural balance and impact the overall health of the ecosystem.
Furthermore, human activities that contribute to soil erosion can indirectly affect pink lakes. Increased sedimentation rates can alter the lakes' water clarity and quality, influencing light availability and potentially impacting the ability of pigment-producing microorganisms to photosynthesize effectively.
To address these human threats, conservation efforts and sustainable practices are essential. Protecting and restoring the delicate balance of these ecosystems requires the implementation of measures to mitigate the impacts of infrastructure development, climate change, pollution, and overexploitation of natural resources. By recognising the interconnectedness between human activities and the natural world, we can work towards preserving the unique beauty and ecological significance of pink lakes.
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Frequently asked questions
There are around a dozen pink lakes in Western Australia.
The pink colour is caused by a combination of factors, including the presence of salt-tolerant algae and bacteria, as well as the level of salinity and climate conditions.
Some of the well-known pink lakes in Western Australia include Lake Hillier on Middle Island, Pink Lake (previously known as Lake Spencer) near Esperance, and Lake Eyre in the outback of South Australia.
