Vancouver Island bat roost remains resilient despite disease threats

The largest known bat maternity roost on Vancouver Island remains resilient following its first official population check of the season. Volunteers at the North Oyster Community Centre recorded an average of 1,936 bats on June 10, consisting of 1,810 little brown myotis emerging from a renovated attic and 126 bats located in nearby bat boxes.

While the initial count shows a slight decrease compared to the 2025 high of 2,085 bats, officials from the North Oyster and Area Historical Society indicate the numbers remain within a normal range. The colony is particularly significant as the little brown myotis is highly susceptible to white-nose syndrome, a deadly fungal disease that has devastated bat populations across North America. To date, there have been no recorded cases of the fungus on Vancouver Island.

Researchers noted that maintaining these healthy populations provides a vital baseline for future comparison should the disease reach the region. Additionally, these bats provide ecological benefits to local communities by naturally controlling insect populations, such as mosquitoes.