Question: What invaders are causing changes along the North American Atlantic coast?

Is Overall gamma diversity may be lowered because species are going extinct because of other causes, but even some of the most insidious invaders (e.g.: Dutch elm disease, emerald ash borer, chestnut blight in North America) have not caused their host species to become extinct. a good answer to this question?

Options are:
1). yes
2). no
2).