I know every creature has its place in the ecosystem, even giant water bugs and mites. But water bugs bite me, and no ecosystem should have something like that. It doesn't help that this picture was taken less than an hour from my home.
So I'm rooting for the mites clinging to the back of this water bug. I'm hoping they aren't hanging on for a ride (phoresy), but that they're really drilling down into the meat of this predator and sucking its juices. I know they won't bring the beast down, but I admire their tenacity.