Question

When an Alien species (plant or animal) that does not belong to an ecosystem is introduced. It spreads and competes with the native plants for space and nutrients and becomes problematic in the absence of natural enemies. These intruders are called invasive alien species.

What are the I'll effects of an invasive species like water hyacinth?
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Answer 1

In fact, introduced species are considered a greater threat to native biodiversity than pollution, harvest, and disease combined. Invasive species threaten biodiversity by (1) causing disease, (2) acting as predators or parasites, (3) acting as competitors, (4) altering habitat, or (5) hybridizing with local species.