UNTAVI, Bolivia - Overturned fishing skiffs lie abandoned on the shores of what was Bolivia's second-largest lake. Beetles dine on bird carcasses and gulls fight for scraps under a glaring sun in what marshes remain.

Lake Poopo was officially declared evaporated last month. Hundreds, if not thousands, of people have lost their livelihoods and gone.

High on Bolivia's semiarid Andean plains at more than 12,000 feet and long subject to climatic whims, the shallow saline lake has essentially dried up before only to rebound to twice the area of Los Angeles.

But recovery may no longer be possible, scientists say.

"This is a picture of the future of climate change," said Dirk Hoffman, a German glaciologist who studies how rising temperatures from the burning of fossil fuels has accelerated glacial melting in Bolivia.

As Andean glaciers disappear, so do the sources of Poopo's water. But other factors are in play in the demise of Bolivia's second-largest body of water behind Lake Titicaca.

Drought caused by the recurrent El Niño meteorological phenomenon is considered the main driver. Authorities say another factor is the diversion of water from Poopo's tributaries, mostly for mining but also for agriculture.

More than 100 families have sold their sheep, llamas, and alpaca, set aside their fishing nets and quit the former lakeside village of Untavi over the past three years, draining it of well over half its population. Only the elderly remain.

"There's no future here," said 29-year-old Juvenal Gutierrez, who moved to a nearby town where he ekes by as a motorcycle taxi driver.

Record-keeping on the lake's history only goes back a century, and there is no good tally of the people displaced by its disappearance. At least 3,250 people have received humanitarian aid, the governor's office said.

Poopo is now down to 2 percent of its former water level, regional Gov. Victor Hugo Vasquez calculated. Its maximum depth once reached 16 feet. Field biologists say 75 species of birds are gone from the lake.

While Poopo has suffered El Nino-fueled droughts for millennia, its fragile ecosystem has experienced unprecedented stress in the past three decades. Temperatures have risen by about 1 degree Celsius while mining activity has pinched the flow of tributaries, increasing sediment.

Florida Institute of Technology biologist Mark B. Bush said the long-term trend of warming and drying threatens the entire Andean highlands.

A 2010 study he coauthored for the journal Global Change Biology says Bolivia's capital, La Paz, could face catastrophic drought this century. It predicted "inhospitable arid climates" would lessen available food and water this century for the more than three million inhabitants of Bolivia's highlands.

A study by the German consortium Gitec-Cobodes determined that Poopo received 161 billion fewer liters of water in 2013 than required to maintain equilibrium.

"Irreversible changes in ecosystems could occur, causing massive emigration and greater conflicts," said the study commissioned by Bolivia's government.