But as more land was cleared for crop production, so much of the woodland was cleared that the huarango's benefits were lost. The land was then exposed to floods from El Niño events and strong winds parched the land when it wasn't flooded.
Clearing the land of trees in order to grow crops had inadvertently and ironically made it impossible to grow crops.
Earlier residents of the valley had survived largely on land snails, along with sea urchins and mussels gathered from the Pacific coast, an eight-hour walk to the west. The researchers found no evidence of domesticated crops in the refuse heaps, called middens, left by these early inhabitants.
Things started to change around 100 B.C. Remains from crops, including pumpkins, maize, and manioc tubers, began appearing in the garbage heaps. Within a few hundred years there was more intensive agriculture. People added beans, peanuts, and chili peppers to their menus.
The feast didn't last long though. After about 500 years of agriculture, the domesticated crops disappeared. People once again survived on only snails and seafood with some wild plants.
In less than two thousand years, the people went full circle and ended up eating what their ancestors had, but without the huarango forests. To this day, the land is barren, with only the ghostly outlines of irrigation canals to suggest that the land once supported an agrarian society.
Further evidence of the change is found in the disappearance of the use of a blue dye from the indigofera shrub. The shrub grows only in the shelter of huarango trees along waterways. The peoples of the Ica Valley frequently sported clothes dyed a rich blue between 100 and 400 A.D. But as agriculture increased, the use of the dye decreased, suggesting the indigofera's habitat was also disappearing. Seeds from the shrub also became rare in the archeological record.
The indigofera eventually disappeared from the lower Ica Valley, but other plants became more common. Grasses that thrive in open areas became more common as the trees were cut down. Weeds that sprout in soil disturbed by agriculture also became more common.
The study of land use in the Ica Valley was recently published in the journal Vegetation History and Archaeobotany.
The peoples of the Ica Valley are not the only Peruvians to suffer from the effects of deforestation. The hills around Lima, Peru were once covered in huarango trees as well. The trees captured the fog from the ocean and fed local aquifers. But after the Spanish conquest, the trees were cut and the hills went dry.
IMAGE 1: The coastal desert of Peru. (Wikimedia Commons)
IMAGE 2: Photo STS109-730-80 from the STS-109 crew on March 9, 2002, showing layers of coastal Peruvian fog and stratus being progressively scoured away by brisk south to southeast winds. Remnants of the cloud deck banked against the larger, obstructing headlands like Peninsula Paracas and Isla Sangayan, giving the prominent "white comma" effect. Southerlies also produced ripples of internal gravity waves in the clouds offshore where warm, dry air aloft interacts with a thinning layer of cool, moist air near the sea surface on the outer edge of the remaining cloud bank. South of Peninsula Baracas, the small headlands channeled the clouds into streaks-local horizontal vortices caused by the headlands provided enough lift to give points of origin of the clouds in some bays. Besides the shelter of the peninsula, the Bahia de Pisco appears to be cloud-free due to a dry, offshore flow down the valley of the Rio Ica. Caption provided by NASA Earth Observatory; image provided by the Earth Sciences and Image Analysis Laboratory at Johnson Space Center.