Parasites are important in keeping a balance among different life forms and in processing dead creatures into food for other creatures. Parasites comprise 80 % of the food web, and the majority of the biomass. One third of parasites could go extinct due to climate change. For an example, parasites cause crickets to jump into streams where they provide food for endangered trout.

https://www.democracynow.org/2017/9/11/the_sixth_extinction_climate_change_may