the ecosystem vs wildlife

the ecosystem

wildlife

noun
  • Animals, plants, and fungi, not normally domesticated, often to the exclusion of plants, fungi, fish, insects and other invertebrates, and microscopic plants and animals; hence 

  • Wild animals (especially to the exclusion of fish). 

  • Members of a college fraternity 

How often have the words the ecosystem and wildlife occurred in a corpus of books? (source: Google Ngram Viewer )