But because these two species primarily affected horses, American scientists stopped working on them decades ago.

Such species affect many other organisms in an ecosystem and help to determine the types and numbers of various others species in a community.

Snell's research broadly examines how human activity and exotic species affect native species.

Electrolytes concentration and other dissolved species may affect cellular physiology.

Important host families and species economically affected include:

Introduced species could negatively affect the numbers of these birds.

In Taiwan this species only affects animals, not humans.

Other invasive species also have affected the Santa Ana River.

Various species of this genus of mite also affect a wide variety of mammals, including humans.

Alien species such as cats, dogs, rabbits, pigs, and rats affected a number of indigenous species.