生態系

1. Origins, structure, and basic meaning

• Structure: 生態系 is a noun read せいたいけい, meaning an ecosystem formed by organisms and their interactions with the surrounding environment.
• Basic usage: It can be something protected in a particular habitat or a whole system affected by a single change.
  • 湿地の生態系を守る活動に参加した。 describes participating in an effort to protect a wetland ecosystem; 一つの変化が生態系全体に影響を与えることがある。 says that one change can sometimes affect an entire ecosystem.

2. Common pitfalls and similar expressions

• 生態系を守る
  • を marks the wetland ecosystem as the object of the protective effort.
• ことがある
  • This pattern expresses possibility and does not claim that every change always has such an effect.
• 生態系 and 環境
  • 環境 broadly denotes surrounding conditions, while 生態系 is the system of interactions among organisms and their environment.