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Global perspectives on the ecology of invasive alien species: people, policy and nature
Helen Roy and many more
Non-Native (= Alien) Species
Henosepilachna argus
Species introduced (aided by humans) outside native range
Invasive Non-Native Species
Harmonia axyridis
Non-Native Species that threatens biodiversity, ecosystems or the way we live
Hottentot fig…home and away
Predation and competition leads to declines of native ladybirds
Roy et al (2012) Diversity and Distributions 18: 717-725
without harlequin
with harlequin- Competition- Predation
= 44% decline in distribution
Adverse effects on ecosystem function and resilience?
25% of first records during 2000–2005 were of species that had not been previously recorded anywhere as alien
Chapman D, Purse B V, Roy H E, Bullock J M. Global trade networks determine the distribution of invasive non-native species. Global Ecology Biogeography 2017;00:1–11.
Invasive Non-Native Species in context
@AlienCSI1
• 1506 established non-native plants
• 469 established non-native animals
• 273 established non-native species designated as having negative ecological or human impact:
– 101 (6.7%) established non-native plants
– 172 (36.7%) established non-native animals
Roy et al. (2014) Biological Invasions; Roy et al. (2017) Tracking changes in the introduction and distributions of non-native species in Great Britain. Final Report - Defra
Documenting invasions in Britain - GBNNSIP
B6 Invasive Non-Native Species
Horizon scanning…
Systematic examination of potential threats and opportunities within a given context
Horizon scanning to predict invasions
Horizon scanning…
…prioritising species for risk assessment
…implementing monitoring and action
Horizon scanning to predict invasions
GB Top 10 – Asian hornet
Vespa velutina
Terrestrial predator
Native to China
Arrived in pottery consignment Bordeaux, France in 2004
Citizen science for monitoring invasions
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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Nu
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f re
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2011 2012 2013 2014
Asian hornet – arrived September 2016
Horizon scanning to predict invasions
Informing the List of IAS of EU Concern
Horizon scanning to predict invasions
Foreign and Commonwealth Office’s Conflict, Stability and Security Fund
Grand Cayman
Saint Helena
Diego Garcia - BIOT
Top invadersFrequency of
occurrence
Perna viridis Asian green mussel 21
Wasmannia auropunctata little fire ant 18
Lissachatina fulica giant African land snail 14
Rattus norvegicus brown rat 13
Aedes albopictus Asian tiger mosquito 11
Pterois miles Lionfish 11
Magallana gigas Pacific oyster 11
Aedes aegypti yellow fever mosquito 10
Mytilus galloprovincialis Mediterranean mussel 10
Impacts across all UKOTs
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10
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80
Biodiversity Economic Human health
Nu
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of
Spe
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Invertebrate Marine Plant Vertebrate
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120
BC EC
F H L
Co
ns R
Oth
er Ag
Aq
BZA Pe
t
Farm Fo
r
FF
Ho
rt
Orn
Res
Live
Oth
er e
scap
e
CN
M
Bai
t
Foo
d
Co
n A
nim
Par
An
im
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lan
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Par
Pla
nt
Seed TT
THM
An
g
Co
nta
ine
r
Air
Ship
Mac
h
Lug
Org
Bal
last
Hu
ll
Veh
Oth
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ran
spo
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Wat
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Tun
Nat
Release Escape Contaminant Stowaway Corr Una
Nu
mb
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f IN
NS
CBD level I and II categories
Biodiversity impact Human health impact
Pathways across all UKOTs
Pathway Action Plans … Biosecurity
Monitoring and surveillance
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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
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2011 2012 2013 2014 2015
2016 2017 2018 2019
Closing thought …Where are all the microbes?
The list excluded garden plants, cultivated crops, pests of stored crops, human parasites and pests of human habitation unless they were thought likely to be foundin the wild. Microorganism (with the
exception of a small number of
marine phytoplankton) and
macrofungi were also not included.
Time to think about pathogens…
Invasions and wildlife disease…
Summary
• Importance of global collaborations
• Sharing information
• Engaging people
• Predicting invasions
