INVASIVE SPECIES

Question 1

Why study invasions? (4)

Answer 1

• significant threat to native ecosystem
• biodiversity and function
• economic impacts
• experiments of opportunity

Question 2

non-indigenous

Answer 2

not from that area. non-endemic. NIS (non-indigeonus species)

Question 3

naturalized

Answer 3

been here for so long that it is a part of the ecosystem. ie: pacific oyster

Question 4

cryptogenic

Answer 4

dont know if its an indigenous species or not

Question 5

intoduced

Answer 5

intentionally/accidentally placed into the ecosystem

Question 6

invader

Answer 6

to spread over or into, to enter for conquest

Question 7

invasive

Answer 7

tending to spread prolifically and undesirably or harmfully.

Question 8

what are the four stages of invasion?

Answer 8

introduction, establishment, dispersal, invasion impact

Question 9

in what facets does invasive species affect regional characteristics?

Answer 9

shipping, recreation, aquaculture

Question 10

Establishment: species characteristics (5)

Answer 10

• wide environmental tolerance
• broad diet
• fast growth, high survival
• fast sexual maturity, high fercundity
• predator refute

Question 11

Establishment: regional characteristics (3)

Answer 11

• high disturbance
• low spp. diversity
• abundant habitat

Question 12

Dispersal: species characteristics (4)

Answer 12

• planktonic larvae
• high dispersal phase
• tolerant larvae
• long planktonic duration

Question 13

Dispersal: regional characteristics (1)

Answer 13

-oceanographic currents conducive to range expansion

Question 14

Invasion impact: species characteristics (2)

Answer 14

• predador resistance/avoidance

- high densities

Question 15

invasion impact: regional characteristics (2)

Answer 15

• highly disturbed habitats

- low spp. diversity

Question 16

what area is included for invasion in ‘pacific northwest’?

Answer 16

• broad spectrum: california-alaska

- local: N. Washington, V. island, Southern BC

Question 17

NIS

Answer 17

non-indigenous species

Question 18

5 modes of introduction

Answer 18

• aquaculture
• ballast water and shipping
• live seafood and fish
• plant nurseries and aquarium trade
• research and teaching

Question 19

name 5 invasive species

Answer 19

• japanese oyster drill
• eastern oyster drill
• green crab
• club tunicate
• crochet blanket tunicate**
• chain sea squirt**

Question 20

3 controls on ballast water and shipping regulations

Answer 20

• Vancouver Port Authority mandatory mid-ocean ballast water exchange
• anti-fouling paint on ship hulls
• mooring line rodent barriers

Question 21

Controls: import régulations (3)

Answer 21

• live seafood and fish import
• plant nursaries and aquaria
• research and teaching

Question 22

2 methods of control/eradication of NIS

Answer 22

• trapping and FW emersion of oysters

- physical removal (i.e.: cleaning/shucking on land)