Qualla: Wallace's Dreampond: Lake Towuti and Its Living Archive

Wallace's Dreampond: Lake Towuti and Its Living Archive: Introduction

Thu, 02 Apr 2026 00:00:00 GMT

Photo credit European Space Agency, RXerself, CC BY-SA 3.0 igo. Somewhere in the mountains of South Sulawesi, a shrimp lives on a sponge. This is not, on its face, remarkable -- except that Caridina spongicola is one of only two known commensal freshwater shrimp species on Earth, and the lake it calls home has been running its own evolutionary experiment for more than a million years. Lake Towuti, the largest lake on the island of Sulawesi, is not a place most travelers could find on a map. But for biologists who study how new species are born, it is one of the most important bodies of water on the planet.

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Image: European Space Agency, RXerself | CC BY-SA 3.0 igo

Wallace's Dreampond: Lake Towuti and Its Living Archive: Five Lakes, One System

Thu, 02 Apr 2026 00:00:00 GMT

Photo credit Unknown author, CC BY-SA 3.0. Lake Towuti is the anchor of the Malili Lake system, a chain of five interconnected lakes in East Luwu Regency that together form one of the world's premier natural laboratories for studying speciation. The other four -- Matano, Mahalona, Masapi, and Lontoa -- are smaller, but ea...

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Image: Unknown author | CC BY-SA 3.0

Wallace's Dreampond: Lake Towuti and Its Living Archive: Creatures Found Nowhere Else

Thu, 02 Apr 2026 00:00:00 GMT

Photo credit European Space Agency, CC BY-SA 3.0 igo. The endemic species of Lake Towuti read like an inventory of evolutionary creativity. Telmatherinid sail-fin silversides flash iridescent flanks in the shallows -- fish so recently diverged that they challenge biologists to define where one species ends and another begins. Glosso...

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Image: European Space Agency | CC BY-SA 3.0 igo

Wallace's Dreampond: Lake Towuti and Its Living Archive: A Climate Record Written in Mud

Thu, 02 Apr 2026 00:00:00 GMT

Photo credit European Space Agency, CC BY-SA 3.0 igo. In 2015, the International Continental Scientific Drilling Program brought a drilling platform to Lake Towuti and extracted more than 1,018 meters of sediment core from eleven sites, reaching 175 meters below the lake floor. The cores represent the longest continuous lacustrine s...

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Image: European Space Agency | CC BY-SA 3.0 igo

Wallace's Dreampond: Lake Towuti and Its Living Archive: Under Siege

Thu, 02 Apr 2026 00:00:00 GMT

Photo credit Marwan Mohamad, CC BY-SA 4.0. The threats to Lake Towuti are converging faster than its species can adapt. Nickel mining operations in the surrounding watershed introduce sediment and pollutants whose full effects remain unstudied. Dams and gates along the Larona River have fragmented fish populations and dis...

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Image: Marwan Mohamad | CC BY-SA 4.0