Butterfly case study

Question 1

Why is an inability to spread into new areas a threat towards some species survival?

Answer 1

Many species are not shifting their distributions as fast as the rate at which the climate itself is changing.
This is particularly the case for habitat specialists and species with poor dispersal ability, for which human-dominated landscapes may present serious barriers to colonization.

Question 2

What has been proposed as a pragmatic and cost-effective conservation tool to facilitate the movement of certain species across landscapes?

Answer 2

Assisted colonization.