I would like to thank my supervisor Jordi Altimiras for the opportunity to travel to Bolivia and participate in this project and for all the help and valuable input throughout the study. I also would like to thank all the people at the Universidad Mayor de San Andrés for the hospitality in providing with the study subjects and for helping out during the experiments. A special thanks to Alvaro Garitano-Zavala which allowed us to work with the “pisaccas” at the university and also to Ernesto who aided in obtaining wild specimen for the tissue analysis.