synecology

/S AY0 N AH0 K AA1 L AH0 JH IY0/
noun
  1. 1

    One of two broad subdivisions of ecology (the other being autecology), meaning the study of groups of organisms associated as a unit (essentially a biological community).

    1959:"In regard to subdivisions, ecology is commonly divided into autecology and synecology." — Odum

Source: https://en.wiktionary.org/wiki/synecology