global perspectives on the ecology of invasive alien
TRANSCRIPT
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Global perspectives on the ecology of invasive alien species: people, policy and nature
Helen Roy and many more
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Non-Native (= Alien) Species
Henosepilachna argus
Species introduced (aided by humans) outside native range
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Invasive Non-Native Species
Harmonia axyridis
Non-Native Species that threatens biodiversity, ecosystems or the way we live
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Hottentot fig…home and away
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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?
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25% of first records during 2000–2005 were of species that had not been previously recorded anywhere as alien
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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.
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Invasive Non-Native Species in context
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@AlienCSI1
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• 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
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B6 Invasive Non-Native Species
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Horizon scanning…
Systematic examination of potential threats and opportunities within a given context
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Horizon scanning to predict invasions
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Horizon scanning…
…prioritising species for risk assessment
…implementing monitoring and action
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Horizon scanning to predict invasions
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GB Top 10 – Asian hornet
Vespa velutina
Terrestrial predator
Native to China
Arrived in pottery consignment Bordeaux, France in 2004
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Citizen science for monitoring invasions
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Asian hornet – arrived September 2016
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Horizon scanning to predict invasions
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Informing the List of IAS of EU Concern
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Horizon scanning to predict invasions
Foreign and Commonwealth Office’s Conflict, Stability and Security Fund
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Grand Cayman
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Saint Helena
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Diego Garcia - BIOT
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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
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Impacts across all UKOTs
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CBD level I and II categories
Biodiversity impact Human health impact
Pathways across all UKOTs
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Pathway Action Plans … Biosecurity
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Monitoring and surveillance
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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.
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Time to think about pathogens…
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Invasions and wildlife disease…
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Summary
• Importance of global collaborations
• Sharing information
• Engaging people
• Predicting invasions