Global flows of insect transport and establishment: the role of biogeography, trade, and regulations

Aim: Non-native species are part of almost every biological community worldwide, yet numbers of species establishments have an uneven global distribution. Asymmetrical exchanges of species between regions are likely influenced by a range of mechanisms, including propagule pressure, native species pools, environmental conditions, and biosecurity. While the importance of different mechanisms is likely to vary among invasion stages, those occurring prior to establishment are difficult to account for. We used records of unintentional insect introductions to test 1) whether insects from some biogeographic regions are more likely to be successful invaders, 2) whether the intensity of trade flows between regions determines how many species are intercepted and how many successfully establish, and 3) whether the variables driving invasion success differ pre- and post-introduction.
Location: Canada, mainland USA, Hawaii, Japan, Australia, New Zealand, Great Britain, South Korea, South Africa.
Met..., , , # Global flows of insect transport and establishment

This repository contains all the necessary files to carry out the analyses in ?Global flows of insect transport and establishment: the role of biogeography, trade, and regulations?. The code is available in the ?flows\_script? R script.

## The data uploaded are:

transport\_flows\_updated.csv - the number of insect species (\"richness\") intercepted during border inspections per unique combination of source country, destination, associated commodity class and decade intercepted. The variables in this file are:

* source: the ISO3 code of the source country
* years: the decade of port interception
* destination: the area of interception
* class: identity of 14 broad commodity classes insects were associated with during transport
* flow: the source and destination pair
* region: the biogeographic region of origin (errors corrected 31.10.23)
* richness: the number of intercepted species
* clim\_dist: the climatic dissimilarity between th...