Ecosystem sentinels for climate change? Evidence of wetland cover changes over the last 30 years in the tropical Andes.

However, we observed a barely significant increase in the top-quartile values of individual wetland surface area over time (slope = 0.8, R 2 = 0.32, p = 0.076; Fig 4B ).

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A review of climate changes in the 20 th century along the tropical Andes [ 34 ] reported 1) a decreasing trend in precipitation after the mid-20 th century in southern Peru and the Bolivian Altiplano [ 35 , 36 , 37 ]; 2) a rise of air temperature at an accelerated rate relative to the global average over recent decades.

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Over the (1984–2011) period, our data showed an increasing trend in the mean wetland total area and number, mainly related to the appearance of wet grassland patches during the wetter years.

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