Author Contributions
This study represent a revised version of the MSc thesis of LRT. LRT,
ET, LM, AB and HK designed the research and LRT, ET, LM and HK conducted
fieldwork. LRT, LM, ET, SM and LN did lab work and LRT, LM, SM and SB
analysed the data. LRT wrote the manuscript in collaboration with HK and
ET and all other co-authors edited and commented.