Do invasive species cause more damage to aquatic ecosystems or terrestrial ecosystems?

Question

Do invasive species cause more damage to aquatic ecosystems or terrestrial ecosystems?

Answer 1

They cause damage to both, but because they could be spread by flowing water (as seeds or vegetative parts which could propagate) faster and further than by wind or most animals (migrating birds would be comparable to water), I'd say the ones in water are more of a threat to a larger portion of the ecosystem.

Water could even spread seeds of more terrestrial invasives to new locations in localized flooding.

There's really no easy answer, since there are variables - water movement and depth, how the seeds are dispersed (and by what, if an animal), and how the damage is caused (shading smaller plants, toxins produced through the roots, strangulation by vines, accelerated streambank erosion) that would have to be considered.

Answer 2

Invasive species cause damage to both aquatic and terrestrial ecosystems.

Aquatic ecosystems are damage by invasive aquatic species such as Salvinia, a water fern; Golden Snail (Pila luzonica). They usually cause imbalance on the natural flow of resources in the system. Algal bloom and Red tide are good examples of imbalance system that caused by too much invasion. Water in that place usually is depleted of oxygen, and nutrients.

Terrestrial ecosystems are also damage by invasive species. The damage that I best know is about on the allelopathic effect of these invasive species that kills the other plants that live near to them thus clearing the soil and made it available only for them.