Thank you for your question.
The way that I understand SARA to work is actually that the prohibitions apply primarily to federal jurisdiction, and that the only way the federal government would ever step on a province's toes is if a province didn't have its own measures to effectively protect the habitat of that species and the species itself from harm or harassment.
As long as a province comes up with its own legislation to effectively protect a species and its habitat, and as long as it enforces that legislation, then there shouldn't be any instance in which the federal government ever actually does extend its jurisdiction into a province.