Which environmental change occurred due to European presence in the Americas?

Which environmental change occurred due to European presence in the Americas?

• A. Beavers were overhunted, leading to destruction of fish habitats.
• B. Beavers thrived thanks to new forests.
• C. Indigenous species increased due to European farming.
• D. European crops eliminated all native flora.

Answer: (A)

Arrival of Europeans altered ecosystems in the Americas, especially through the fur trade that hunted beavers. Beavers are ecosystem engineers: their dams create ponds and wetlands that provide rich habitats for fish and many other species. When beaver populations were heavily hunted for pelts, these dammed wetlands diminished, and water flow, sediment patterns, and habitat complexity changed. With fewer beavers, fish habitats suffered, making this environmental change a direct consequence of European presence and exploitation. The other ideas don’t fit as well. European farming did not magically increase native species or eliminate all native flora; it often disrupted ecosystems and introduced changes that could threaten native plants. The notion that beavers thrived because of new forests contradicts the historical impact of intense hunting and habitat alteration driven by European activity.

Arrival of Europeans altered ecosystems in the Americas, especially through the fur trade that hunted beavers. Beavers are ecosystem engineers: their dams create ponds and wetlands that provide rich habitats for fish and many other species. When beaver populations were heavily hunted for pelts, these dammed wetlands diminished, and water flow, sediment patterns, and habitat complexity changed. With fewer beavers, fish habitats suffered, making this environmental change a direct consequence of European presence and exploitation.

The other ideas don’t fit as well. European farming did not magically increase native species or eliminate all native flora; it often disrupted ecosystems and introduced changes that could threaten native plants. The notion that beavers thrived because of new forests contradicts the historical impact of intense hunting and habitat alteration driven by European activity.