These opalescent nudibranchs seem unfazed that the rust-colored bryozoan they are crawling over is an invasive species that’s taken up residence in Monterey Bay National Marine Sanctuary.
Watersipora subtorquata is a filter-feeding invertebrate that grows on hard surfaces like rocks, pier pilings, and ship hulls. It’s a problem along the West Coast, where it can harm native invertebrate species by smothering them or outcompeting them for space. Monterey Bay National Marine Sanctuary researchers continue to study Watersipora to understand how it is impacting the health of the sanctuary.
(Photo: Steve Lonhart/NOAA)
[Image description: Two opalescent nudibranchs crawling over a red invasive bryozoan.]
















