Ability to Respond Total:11 / 25Ability to Respond = ( Ease of Response + Tools in Place )
Confidence:Medium
Confidence Notes:
Impact
Spread
Notes
Score
Spread Rate
High local densities: 3 species of Nerodia have established a self-sustaning population in L.A., Folsom and Roseville, and possibly Berkeley.
3
Spread Amount
Nerodia survive in riparian and urban environments
3
Damage
Notes
Score
Ecological
Predators damage native ecosystems by decimating populations of native prey species, and introduced non-native species also compete with native species for food and habitat.
5
Agricultural
0
Infrastructure
0
Cultural
0
Health
0
Benefit
Notes
Score
Ecological
Nerodia preys on other undesirable invasives
1
Agricultural
0
Infrastructure
0
Cultural
0
Health
0
Total
10
Ability to Respond
Ease of Response
Notes
Score
Detection
Snake surveys require labor, skill and are moderately successful.
3
Control
Some difficulty due to limited control measures and negative public sentiment to control. Control methods include egg addling, relocation or killing and shooting of adult birds.
1
Tools in Place
Notes
Score
Entry
Prohibitions have been publicized and enforced by DFG
3
Control
Hand capture (w/tongs), mist nets, funnel traps, and cover boards captured/ delimited >100 at Folsom site.
3
Outreach
Low awareness of CA public. Herp trade releases likely cause of existent CA populations.
