Abstract
Within arthropods, ticks harbour among the highest diversity of heritable endosymbionts reported so far, encompassing at least ten different bacterial genera. While the function of these heritable endosymbionts has not been fully determined yet, they have the potential to deeply influence the ecology of ticks impacted by climate change. This chapter focuses on the impact of heritable endosymbionts on tick growth, reproduction, survival and adaptation under environmental changes caused by climate change.