J. paleolimnol. J. paleolimnol. Climate changes and human activities recorded in the sediments of Lake Estanya (NE Spain) during the Medieval Warm Period and Little Ice Age Morellón Mario Valero-Garcés Blas González-Sampériz Penélope Vegas-Vilarrúbia Teresa Rubio Esther Rieradevall Maria Delgado-Huertas Antonio Mata Pilar Romero Óscar Engstrom Daniel R. López-Vicente Manuel Navas Ana Universidad de Zaragoza Soto Jesús 2011 research-article