Che cosa significa the intervening century and a half ?

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@nakamabuchi Does your sentence come from this article?

https://www.caryinstitute.org/news-insights/def...

In this context, "intervening" means "to come or occur between two times or events"

Example: Twenty years intervened between their first and last meetings. Meaning 20 years passed between their 1st and last meetings.

Source of definition:
https://www.merriam-webster.com/dictionary/inte...

So in the case of the article about ecology, "the intervening century and a half" refers to the century and a half (150 years) that passed between the mid-19th century (when ecology was defined around 1850) and the modern day when the article was written (the 2000s).

Let me know if it doesn't answer your question or if it's not clear.