Bibliographical noteFunding Information:
Acknowledgments The 2004 field expedition would not have been possible without the cooperation of the Department of Geology and Geophysics, and the Limnological Research Center, University of Minnesota. We are forever grateful to Doug Schnurrenberger, Mark Shapley and Anders Noren for making the expedition possible. Numerous Spanish scientists participated in the coring of the lakes and their help and enthusiasm are greatly appreciated. Financial support for the fieldwork and subsequent analyses came from different projects of the Spanish Ministry of Science and Innovation (CLIVAR, LIMNOCLIBER, CALIBRE, GLOBALKARST, GRACCIE-CONSOLIDER). Finally, we thank the referees who reviewed the papers and JOPL editor Mark Brenner.
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