Biological Invasions - (maybe watch recording)

Question 1

non-native species definition

Answer 1

species introduced to a region outside of its natural range (where it evolved)

Question 2

biological invasion

Answer 2

the spread and establishment (self-sustaining) of a species into a region beyond its natural range

Question 3

processes of a biological invasion

Answer 3

introduction –> establishment –> geographic spread d

population expands, then repeat

Question 4

invasive species

Answer 4

spreads rapidly, highly successful
adverse ecological or economic effects

Question 5

species are being moved long distances to regions that they could never reach without human assistance

Answer 5

true, even at the poles

Question 6

invasions are now occurring at unprecedented rates

Answer 6

true, way above background rate of extinction
and will continue to rise exponentially

Question 7

how are species transported

Answer 7

stowaways
ship hulls
ballast water from ships

Question 8

invasive species are a major threat to native biodiversity

Answer 8

true, one can cause dozens of extinctions (snake, nile perch)
60% of all animal extinctions had invasions as a factor

Question 9

Non-native consumers cause more damage to prey populations than do native consumers

Answer 9

true, ex cats
cause extinctions more often on islands (no native cats) than on mainland sites

both herbivores and omnivores (goats and rats)

Question 10

ecological distinctiveness hypothesis

Answer 10

largest impacts are caused by species invading systems where no similar species exist

Question 11

invasions can disrupt ecosystems, often in unpredictable ways ***

Answer 11

peacock cichlid, rats, malarial mosquitoes

Question 12

invasions degrade ecosystem services and cause a broad range of socioeconomic impacts

Answer 12

true, crop pests, bats, insects

Question 13

what should be done about invasions (4)

Answer 13

1. create systems of early detections + rapid response
2. better risk assessment methods for identifying and prioritizing high-risk invaders
3. identify and control emerging vectors and pathways
4. tighten regulations concerning trade in live organisms