Key Takeaways
- The invasive lionfish (Pterois volitans) has population densities exceeding 400 individuals per acre in some invaded reefs of the Atlantic
- Kudzu (Pueraria montana) covers approximately 7 million acres in the southeastern United States, spreading at a rate of 2,500 acres per day
- The brown tree snake (Boiga irregularis) has caused the extinction of 12 native bird species on Guam since 1940s introduction
- European starlings (Sturnus vulgaris) cause over $800 million in annual agricultural damage in the US by consuming crops and contaminating feed
- The emerald ash borer (Agrilus planipennis) has killed tens of millions of ash trees across 35 US states, leading to $10-30 billion in urban tree replacement costs
- The economic impact of invasive weeds in the US rangelands totals $2 billion annually in lost forage production
- Burmese pythons in the Florida Everglades have reduced small mammal populations by up to 99% in some areas since their establishment in the 1990s
- Asian carp (multiple species) make up over 90% of the biomass in some sections of the Illinois River, displacing native fish species
- In Hawaii, invasive rats consume 85-100% of the seeds of native plants in some forests, preventing regeneration
- Lionfish off North Carolina coasts have increased 700% since 2010, with densities up to 10 times natural levels
- Over 6,500 non-native species established in the US, with 42% causing economic or ecological harm
- Invasive signal crayfish (Pacifastacus leniusculus) occupy 95% of UK freshwater sites, hybridizing with natives
- US national parks spend $15 million yearly on invasive plant control, covering 1.5 million acres treated
- Biological control agents have been released against 230 invasive weeds in the US, with 50% success in suppression
- Early detection rapid response programs in the US prevent $100 million in annual invasive species damages
Invasive species cause severe environmental and economic damage worldwide.
Ecological Impacts
- Burmese pythons in the Florida Everglades have reduced small mammal populations by up to 99% in some areas since their establishment in the 1990s
- Asian carp (multiple species) make up over 90% of the biomass in some sections of the Illinois River, displacing native fish species
- In Hawaii, invasive rats consume 85-100% of the seeds of native plants in some forests, preventing regeneration
- Zebra mussels (Dreissena polymorpha) filter up to 1 liter of water per mussel per day, clearing entire lakes of phytoplankton and altering food webs
- In New Zealand, invasive possums (Trichosurus vulpecula) defoliate 20,000 tons of native vegetation per night across forests
- In the Great Lakes, sea lamprey (Petromyzon marinus) invasions led to 90% declines in lake trout populations before control measures
- Cane toads (Rhinella marina) in Australia poison native predators with bufotoxin, causing 30-50% mortality in some snake populations
- Global invasive species cause 40% of all animal and plant extinctions recorded since 1500
- In South Africa, invasive pines cover 2 million hectares, consuming 7% of national water supply
- Invasions of Varroa destructor mites have caused 30-50% annual honeybee colony losses in the US since 1987
- Invasive Nile perch (Lates niloticus) in Lake Victoria caused extinction of 200+ cichlid species since 1950s
- Invasive earthworms alter 20% of North American forests, reducing native seedling survival by 50%
- Laurel wilt disease, vectored by redbay ambrosia beetle, killed 90% of redbay trees in southeast US
- Over 50% of US endangered species are threatened by invasives
- Invasives alter fire regimes, increasing wildfire intensity by 20-50% in invaded shrublands
- 37% of US fish at risk from invasive species introductions
- Invasive ants displace 90% of native ants in Hawaiian ecosystems
- Invasives hybridize with natives in 15% of endangered plant cases
- Spiny water fleas (Bythotrephes longimanus) reduce zooplankton by 65% in invaded lakes
- 60% of New Zealand's threatened birds impacted by invasives
- Phosphorus release from dead invasive plants increases algal blooms by 20%
Ecological Impacts Interpretation
Economic Impacts
- European starlings (Sturnus vulgaris) cause over $800 million in annual agricultural damage in the US by consuming crops and contaminating feed
- The emerald ash borer (Agrilus planipennis) has killed tens of millions of ash trees across 35 US states, leading to $10-30 billion in urban tree replacement costs
- The economic impact of invasive weeds in the US rangelands totals $2 billion annually in lost forage production
- Feral hogs (Sus scrofa) in the US destroy $2.5 billion worth of agricultural crops and property each year through rooting and feeding
- Nutria (Myocastor coypus) cause $1 million in annual damage to Louisiana wetlands by consuming vegetation at rates of 25% of their body weight daily
- The US spends $120 billion annually on managing invasive species impacts across all sectors
- In California, yellow starthistle (Centaurea solstitialis) infests 15 million acres, reducing grazing capacity by 50%
- Japanese knotweed (Fallopia japonica) infests 10% of UK riparian zones, costing £165 million annually in control
- The Mediterranean fruit fly (Ceratitis capitata) causes $2 billion in global fruit crop losses yearly
- Invasive apple snails (Pomacea canaliculata) destroyed 20% of rice paddies in the Philippines in 2012 outbreaks
- US forests lose $4.5 billion annually to invasive pests like bark beetles and pathogens
- In the UK, Japanese knotweed remediation costs average £10,000 per property
- Invasives reduce US GDP by 0.1-0.5% yearly through lost productivity
- The US has 250 established non-native aquatic plants, impacting recreation $1 billion/year
- Invasive mussels cost US power plants $3.4 billion in maintenance since 1989
- Golden apple snail invasions cost Asia $1.4 billion in rice losses over decade
- US invasive plant control market valued at $1.2 billion in 2022
- Economic cost of invasives in Great Lakes: $7 billion over 20 years
- Invasive rust Puccinia on wheat costs global $1 billion/year
- Invasive sea squirts cost Canadian aquaculture $300 million since 1999
- Invasive fruit flies cost Hawaii $200 million in exports yearly
Economic Impacts Interpretation
Geographic Distribution
- Lionfish off North Carolina coasts have increased 700% since 2010, with densities up to 10 times natural levels
- Over 6,500 non-native species established in the US, with 42% causing economic or ecological harm
- Invasive signal crayfish (Pacifastacus leniusculus) occupy 95% of UK freshwater sites, hybridizing with natives
- Common reed (Phragmites australis) in North America expands at 2-4% annually, covering 500,000 acres in Great Lakes
- European green crab (Carcinus maenas) densities reached 100 per trap in California bays by 2020
- The Great Lakes invasive species number over 180, introduced via ballast water primarily
- Cogongrass (Imperata cylindrica) infests 1.25 million acres in southeastern US
- Global trade in live animals introduces 10,000 potential invasive species annually
- In the Mediterranean, Caulerpa taxifolia covers 13,000 hectares since 1984
- In British Columbia, Europe I zebra mussel veligers detected, potential for Great Lakes spread
- Invasive algae Undaria pinnatifida covers 1,000 km of Australian coastline
- Invasive didymo (Didymosphenia geminata) fouls 1,000 km of New Zealand rivers
- Leafy spurge (Euphorbia esula) infests 5.7 million acres in northern plains US
- Eurasian collared-doves spread to 47 US states since 1982
- Port Orford cedar root disease spread by invasives threatens 70% of range
- Global invasive species database lists 17,495 species
- Killer algae (Caulerpa taxifolia) mats in California cover 2 acres
- Spotted knapweed (Centaurea stoebe) infests 4.5 million acres in Idaho alone
Geographic Distribution Interpretation
Management and Control
- US national parks spend $15 million yearly on invasive plant control, covering 1.5 million acres treated
- Biological control agents have been released against 230 invasive weeds in the US, with 50% success in suppression
- Early detection rapid response programs in the US prevent $100 million in annual invasive species damages
- Australia eradicates 80% of new invasive species detections within 5 years via border biosecurity
- In the Pacific Northwest, manual removal of English ivy covers 10,000 acres annually, restoring native forests
- Tamarix (saltcedar) removal in the Southwest US restored 200,000 acres of riparian habitat since 2000
- The US Fish and Wildlife Service has funded $200 million in invasive species projects since 1997 under NISA
- Herbicide use for invasive control on US highways totals 1.5 million gallons yearly
- Feral cat sterilization programs in Australia reduced populations by 40% on islands over 10 years
- In Florida, python removal challenges removed 6,000 snakes in 2021, reducing densities by 20% locally
- On Lord Howe Island, rats were eradicated in 2019, leading to 95% recovery of bird populations within 2 years
- Integrated pest management for invasives saves US agriculture $16 billion yearly
- US Coast Guard inspections prevented 2,500 potential invasive introductions via ballast water in 2022
- Sterile insect technique eradicated screwworm from US livestock, saving $900 million annually
- Rabbit hemorrhagic disease virus used in Australia killed 80% of feral rabbits in trials
- Gene drive technology trials for mice on islands show 90% population reduction
- Border inspections in EU intercept 25,000 invasive consignments yearly
- Feral swine eradications on 400 US properties since 2018 via aerial gunning
- CRISPR-edited sterile salmon prevent aquaculture escapes in trials
- Australia’s Biosecurity Act intercepts 99.5% of high-risk imports
- US states spend $500 million on feral hog control annually
- Biological control of water hyacinth reduced coverage by 94% in Lake Victoria
- US invasive species early warning system detects 100 new threats yearly
- Fipronil bait reduced crazy ant populations by 90% in Texas trials
- US ballast water management rule prevents 160 invasions yearly
- Drone-based herbicide application controls 1,000 acres of invasives daily in Australia
- Rust fungi biocontrol suppressed skeletonweed by 99% in Australia
- US Army Corps removes 20 million cubic yards of invasives from waterways yearly
- National Invasive Species Council coordinates 13 federal agencies
- Tamarisk leaf beetles defoliate 1 million saltcedar trees yearly in Southwest
Management and Control Interpretation
Species-Specific Statistics
- The invasive lionfish (Pterois volitans) has population densities exceeding 400 individuals per acre in some invaded reefs of the Atlantic
- Kudzu (Pueraria montana) covers approximately 7 million acres in the southeastern United States, spreading at a rate of 2,500 acres per day
- The brown tree snake (Boiga irregularis) has caused the extinction of 12 native bird species on Guam since 1940s introduction
- Giant African land snails (Lissachatina fulica) consume over 500 plant species and carry the rat lungworm parasite affecting humans
- Invasive Spartina alterniflora hybrids cover 50,000 acres in San Francisco Bay, reducing tidal flows by 30%
- Hemlock woolly adelgid (Adelges tsugae) has infested 50% of the hemlock range in the eastern US, killing trees within 4-10 years
- Invasive Phragmites australis displaces native vegetation along 1,000 miles of US Atlantic coast, altering bird habitats
- In Europe, the Asian hornet (Vespa velutina) has spread to 13 countries since 2004, killing 20-30% of managed honeybee colonies per attack
- Red imported fire ants (Solenopsis invicta) infest 320 million acres in the US, stinging 40% of population yearly
- Scotch broom (Cytisus scoparius) covers 1.1 million acres in the Pacific Northwest, reducing conifer regeneration by 90%
- Australian paperbark (Melaleuca quinquenervia) invaded 500,000 acres of Florida Everglades, altering hydrology
- Ficus microcarpa invades urban areas in Florida, displacing natives on 10,000+ acres
- Eurasian watermilfoil (Myriophyllum spicatum) chokes 500,000 acres of US waterways
- In Hawaii, coqui frogs (Eleutherodactylus coqui) reach densities of 91,000 per hectare
- Hydrilla verticillata forms mats up to 30 feet deep in US lakes
- Arundo donax (giant reed) uses 2x more water than natives in California
- Polyphagous shot hole borer infests 300,000 trees in California since 2003
- Miconia calvescens covers 10% of Tahiti's forests, shading out natives
- Thousand cankers disease killed 15 million walnut trees in western US
- Asian longhorned beetle quarantine spans 11 states, destroying 30 million trees potentially
- Canada thistle (Cirsium arvense) occupies 5 million acres in US prairies
- Cheatgrass (Bromus tectorum) covers 58 million acres in Great Basin, increasing fire frequency 4x
- Oriental bittersweet (Celastrus orbiculatus) girdles 75% of trees in invaded forests
- Invasive oaks (Quercus spp.) in South Africa hybridize, threatening fynbos biodiversity
- Invasive mosquitoes transmit 80% of Zika cases globally
Species-Specific Statistics Interpretation
Sources & References
- Reference 1USGSusgs.govVisit source
- Reference 2INVASIVESPECIESINFOinvasivespeciesinfo.govVisit source
- Reference 3USDAusda.govVisit source
- Reference 4APHISaphis.usda.govVisit source
- Reference 5HEARhear.orgVisit source
- Reference 6BLMblm.govVisit source
- Reference 7GLSCglsc.usgs.govVisit source
- Reference 8DOCdoc.govt.nzVisit source
- Reference 9GLFCglfc.orgVisit source
- Reference 10SFEIsfei.orgVisit source
- Reference 11GAOgao.govVisit source
- Reference 12ENVIRONMENTenvironment.gov.auVisit source
- Reference 13NAna.fs.usda.govVisit source
- Reference 14PHRAGMITESphragmites.netVisit source
- Reference 15IUCNiucn.orgVisit source
- Reference 16CAL-IPCcal-ipc.orgVisit source
- Reference 17LIONFISHlionfish.coastal.eduVisit source
- Reference 18ECec.europa.euVisit source
- Reference 19NPSnps.govVisit source
- Reference 20ARSars.usda.govVisit source
- Reference 21DOIdoi.govVisit source
- Reference 22AGRICULTUREagriculture.gov.auVisit source
- Reference 23FSfs.usda.govVisit source
- Reference 24FWSfws.govVisit source
- Reference 25FHWAfhwa.dot.govVisit source
- Reference 26DCCEEWdcceew.gov.auVisit source
- Reference 27MYFWCmyfwc.comVisit source
- Reference 28CEHceh.ac.ukVisit source
- Reference 29ENVIRONMENT-AGENCYenvironment-agency.gov.ukVisit source
- Reference 30SANBIsanbi.orgVisit source
- Reference 31FAOfao.orgVisit source
- Reference 32GREATLAKESRESTORATIONgreatlakesrestoration.usVisit source
- Reference 33CABIcabi.orgVisit source
- Reference 34BIRDLIFEbirdlife.orgVisit source
- Reference 35CDFAcdfa.ca.govVisit source
- Reference 36INVASIVEinvasive.orgVisit source
- Reference 37EPAepa.govVisit source
- Reference 38FSfs.fed.usVisit source
- Reference 39IPMCENTERSipmcenters.orgVisit source
- Reference 40RHSrhs.org.ukVisit source
- Reference 41IUCNREDLISTiucnredlist.orgVisit source
- Reference 42SELsel.usda.govVisit source
- Reference 43DCOdco.uscg.milVisit source
- Reference 44EDISedis.ifas.ufl.eduVisit source
- Reference 45NATUREnature.comVisit source
- Reference 46NRRInrri.umn.eduVisit source
- Reference 47NASnas.er.usgs.govVisit source
- Reference 48CIESMciesm.orgVisit source
- Reference 49FOODfood.ec.europa.euVisit source
- Reference 50GOVwww2.gov.bc.caVisit source
- Reference 51DPIdpi.nsw.gov.auVisit source
- Reference 52UCANRucanr.eduVisit source
- Reference 53MARKETSANDMARKETSmarketsandmarkets.comVisit source
- Reference 54MPImpi.govt.nzVisit source
- Reference 55GLRIglri.usVisit source
- Reference 56NATIONALFERALHOGMAPnationalferalhogmap.usVisit source
- Reference 57IWMIiwmi.cgiar.orgVisit source
- Reference 58NRCSnrcs.usda.govVisit source
- Reference 59SEAGRANTseagrant.umn.eduVisit source
- Reference 60DFO-MPOdfo-mpo.gc.caVisit source
- Reference 61TSUSINVASIVEStsusinvasives.orgVisit source
- Reference 62HDOAhdoa.hawaii.govVisit source
- Reference 63WEEDSweeds.org.auVisit source
- Reference 64CSIROcsiro.auVisit source
- Reference 65USACEusace.army.milVisit source
- Reference 66IDAHOINVASIVESidahoinvasives.orgVisit source
- Reference 67WHOwho.intVisit source
- Reference 68TAMARISKCOALITIONtamariskcoalition.orgVisit source





