Question

In an attempt to restore biodiversity, some regions in the U. S. have begun large-scale restoration experiments involving dam removal; since the mid-1980's, many aging dams are being considered for removal rather than replacement.

How would this strategy help to restore biodiversity in a region? Choose the one answer that does NOT apply.

Responses
A improved water qualityimproved water quality
B decrease in invasive fish speciesdecrease in invasive fish species
C renewed annual spawning migrationsrenewed annual spawning migrations
D restoration of naturally-fluctuating water levelsrestoration of naturally-fluctuating water levels
E decrease in the availability of water to all species in the area

Answer 1

E

Removing dams generally improves water quality (A), can reduce habitat favoring invasive reservoir species (B), restores migratory routes for spawning fish (C), and brings back natural flow regimes (D). It does not help by decreasing water availability to all species — that would harm biodiversity rather than restore it.