© MARÍA EUGENIA FARÍASIt looks peaceful, but Laguna del Diamante's waters are deadly.
Argentinian investigators have found flamingos and mysterious microbes living in an alkaline lagoon nestled inside a volcano in the Andes. The organisms, exposed to arsenic and poisonous gases, could shed light on how life began on Earth, and their hardiness to extreme conditions may hold the key to new scientific applications.
In 2009, a team led by María Eugenia Farías, a microbiologist at the National Scientific and Technical Research Council in Tucumán, Argentina, discovered living stromatolites in the Socompa and Tolar Grande lagoons high in the Andes (see
'High window on the past'). Stromatolites - collections of photosynthetic microorganisms and calcareous concretions - are thought to have been common more than 3.5 billion years ago.
After that discovery, scientists in Argentina decided to look at lakes and lagoons in the Puna de Atacama, a desert plateau that sits more than 4,000 metres above sea level, in an attempt to understand what life might have looked like on the early Earth.
