For pathways for invasive species spread, you first have to look at the pathway into Canada, how it's getting here in the first place, and then once it's in Canada, the pathway of how it spreads through the country.
For the firewood pathway analysis we did, we were looking at spread within Canada—assuming that an invasive species is already established in one part, how it may spread to other parts of Canada through the human-facilitated transport of firewood.
We basically looked at firewood producers in Canada and firewood vendors. It's a big network of stores, from Canadian Tire and big box stores to the roadside sellers who might not be regulated. It's hard to capture where people might be obtaining this firewood and then where they might be bringing it.
We looked at networks of infrastructure, where campgrounds are located, what species' firewood they might be bringing, what regulations are currently in place.