Acknowledgements
This work was supported by the Ministerio de Economía y Competitividad of Spain (CGL2016-75255; CGL2016-80651; PID2019-103947GB, PID2019-105794GB) and the Comissió Interdepartamental de Recerca I Innovació Tecnològica of Catalonia, Spain (2017SGR83, 2017SGR1287). A.S.-G. is a Serra Húnter Fellow. P. E. was supported by an FPI grant (Ministerio de Economía y Competitividad of Spain, BES-2017-081740). We acknowledge the Garajonay National Parks for granting collection permits and helping with lodging and logistics during fieldwork.