How to say "ecosystem" in Japanese

• 生態系せいたいけいCommon
  nounThe usual word for an ecosystem in the biological sense: the community of organisms and their environment. Use it for ecological, environmental, and nature-related contexts.
  地球ちきゅうの生態系せいたいけいはある程度ていど自己じこ修正しゅうせいされるもので、その結果けっかが他ほかの変化へんかによって隠かくされているという可能性かのうせいもある。↗

  The earth's ecosystem is to some extent self-correcting, so it is also possible that the effects are being masked by other changes.
• エコシステム
  nounA katakana rendering of 'ecosystem' covering the same ground as 生態系, especially in technical or business writing. It is less common, and 生態系 is usually the word you want for the ecological sense.
• 経済圏けいざいけん
  nounNot the ecological sense; this means an 'ecosystem' of services, goods, and the like within a company or consortium. It is a marginal match for English 'ecosystem' and suits only business or economic contexts.

For the ecological sense use 生態系, the common word; 「エコシステム」 is a rarer katakana alternative; 経済圏 covers business 'ecosystems' of services and goods within companies or consortia.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 生態系せいたいけいecosystem
• エコシステムecosystem
• 経済圏けいざいけんecosystem (of services, goods, etc. within a company or consortium)