 In the Spanish Pyrenees , recent studies have shown important losses in extent and volume of the glaciers of the Maladeta massif during the period 1981 – 2005 . These include a reduction in area of 35 @.@ 7 % , from 2 @.@ 41 km2 ( 600 acres ) to 0 @.@ 627 km2 ( 155 acres ) , a loss in total ice volume of 0 @.@ 0137 km3 ( 0 @.@ 0033 cu mi ) and an increase in the mean altitude of the glacial termini of 43 @.@ 5 m ( 143 ft ) . For the Pyrenees as a whole 50 – 60 % of the glaciated area has been lost since 1991 . The Balaitus , Perdigurero and La Munia glaciers have disappeared in this period . Monte Perdido Glacier has shrunk from 90 hectares to 40 hectares . 
