na-adjective
Used to describe things related to ecology or the environment, often in academic or formal contexts.
生態的な問題について議論する。
We discuss ecological issues.
この地域の生態的なバランスは崩れている。
The ecological balance of this region is disrupted.
環境的 means 'environmental' in a broader sense, while 生態的 specifically refers to ecological relationships among organisms.
Derived from 生態 (ecology) + 的 (adjectival suffix).