Chapter 17

Question 1

Pragmatic approach to managing species

Answer 1

PEC

1. Prevention
2. Eradication
3. Control

Question 2

Evolutionary imbalance hypothesis

Answer 2

Invasive species are good competitors because they had a history of competition in their native lands. In new areas with less competition they will out-compete other species.

Question 3

Natural enemy hypothesis

Answer 3

Species have natural enemies in their native lands that will keep the population in control, but if you put a species in a new area without these enemies the species will experience faster population growth.

Question 4

Darwin’s naturalization hypothesis

Answer 4

introduced species are less likely to become established in a new area if a species of the same genus already lives in that area.

Question 5

biotic resistance hypothesis

Answer 5

stable and diverse communities have lower invasability than unstable communities

Question 6

biotic acceptance hypothesis

Answer 6

whatever conditions are good for native biodiversity will be good for nonnative biodiversity

Question 7

propagule pressure

Answer 7

the frequency and quantity of organisms introduced to a sight

Question 8

Tens rule

Answer 8

10% of imported species escape control, 10% establish self sustaining populations, and 10% of that become problematic or damaging invaders

Question 9

Why is the tens rule a false comfort?

Answer 9

MTV

1. volume of introductions is really big so success can be considerable
2. long time lags between importation and establishment of sustaining populations
3. more than 10% can become problematic