Host-symbiont stress response to lack-of-sulfide in the giant ciliate mutualism
Fig 4
Symbiont response to sulfide starvation applying SEM.
Microzooid from colony freshly collected from the environment (A), and several colonies after 48 h in oxic seawater (B-G); (B) overview of colony covered in part with mucus; (C-G) microzooids with symbionts fully covering the host, and with gradually less and less symbiont coverage; arrows point to very long rods most likely not symbionts.