IPA: /ˌpeɪliˌoʊɪˈkɒlədʒɪkəl/
KK: /ˌpeɪliˈoʊɪˌkɒlədʒɪkəl/
Relating to the study of ancient ecosystems and environments from geological history.
The researchers published a paper on paleoecological changes during the last ice age.
Paleoecological → It is formed from "paleo-" (from Greek "palaios", meaning ancient) and "ecological" (from Greek "oikos", meaning house or environment, and "logia", meaning study). The word refers to the study of ancient environments and ecosystems.
Think of 'ancient' ('paleo-') environments and ecosystems ('ecological') to remember that paleoecological means the study of ancient ecological systems.