Boiga irregularis Scorecard

Species:  Boiga irregularis

Common Name:  Brown treesnake

Scorecard created on
Last Updated on

Results

Impact Total:27 / 35Impact = ( Spread + Damage - Benefit )

Ability to Respond Total:11 / 25Ability to Respond = ( Ease of Response + Tools in Place )

Confidence:High

Confidence Notes:

Impact

SpreadNotesScore
Spread RateResponsible for exterminating "10 of 13 native bird species, 6 of 12 native lizard species, and 2 of 3 bat species on the island of Guam (www.invasivespecies.gov)."5
Spread AmountUnprecedented high populations have contributed to further dispersal to other islands5
DamageNotesScore
EcologicalColonization of Guam has resulted in the loss of at least 17 vertebrates from the island over last 40 years (www.invasivespecies.gov)."5
AgriculturalSubsistence agriculture damage, esp. poultry3
Infrastructure3
CulturalBrowntree snakes bites on children mildly venomous3
HealthOver 50% infant <4yrs snakebites on Guam3
BenefitNotesScore
Ecological0
Agricultural0
Infrastructure0
Cultural0
Health0
Total27

Ability to Respond

Ease of ResponseNotesScore
DetectionAdults can be trapped reliably, but visual search can detect all individuals in a population regardless of size.3
ControlControl prohibitively expensive after established, hence prevention through screening1
Tools in PlaceNotesScore
EntryProhibitions have been publicized and enforced by DFG; Sec. 671, Title 14, Calif. Code of Regulations): it is unlawful to import, transport, or possess Boiga spp. in CA.3
Control3
OutreachLow awareness of CA public. Herp trade releases likely cause of existent CA populations..1
Total11

References