How would a giant structure in the sky affect life below it?

I am making a world with a gigantic structure the surface size of a smaller continent. This structure is suspended about a hundred meters above ground, and before the construction the area below was covered with meadows and forest, with animals living in them. My question is, what would the consequences, short- and long term(like 50 000-100 000 years), of this giant structure be for the vegetation and wildlife below it?

Edit: The structure is supposed to block sunlight from reaching the ground, so I'm asking how that would affect the life below, in small and large time scales. Another thing I'm wondering about is, what life could live below the structure, and what conditions, given that sunlight or similar is not available, would be necessary to allow that life to live there?

Edit: Suspended may not have been the correct word, as it's actually held up by lots and lots of large pillars.

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How would a giant structure in the sky affect life below it?

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