Widespread coral-algae symbioses endured historical climate changes A community of Pocillopora corals on a reef in Palau with light micrograph insets of Cladocopium pacificum nov. (left) and Cladocopium latusorum sp. nov. (right), two dinoflagellate symbionts critical to these coral animals' health and growth. Image: Coral photo, Tom Bridge, James Cook University; algae photos, Kira Turnham, Penn State Widespread coral-algae symbioses endured historical climate changes May 24, 2021 UNIVERSITY PARK, Pa. — One of the most important and widespread reef-building corals, known as cauliflower c...