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If you traverse some of Hawaiʻi's shorelines (specifically Oʻahu's south and east shores, parts of Maui and Hilo) and notice seaweed in the water, chances are they could be invasive and not native species. And this could have an adverse effect on the seafood we eat and the health of coral reefs.

Botanists from the University of Hawaiʻi at Mānoa have uncovered key survival strategies used by invasive seaweed species in nearshore ecosystems, potentially explaining their dominance over native Hawaiian limu in certain habitats. Nearshore ecosystems extend up to 300 feet offshore, encompassing the shallow coastal waters where land and ocean environments interact and many marine species live and feed.

An October 2024 study published in Scientific Reports found that invasive species such as "gorilla ogo" and "spiny seaweed" thrive in areas with submarine groundwater discharge, where daily tidal cycles create extreme salinity (salt level) fluctuations.

"Understanding how invasive seaweed outcompetes native limu is crucial to furthering our knowledge about reefs and ocean environments," said Veronica Gibson, a postdoctoral researcher at the UH Mānoa Hawaiʻi Institute of Marine Biology and Heʻeia National Estuarine Research Reserve, and UH Mānoa School of Life Sciences Ph.D. graduate.

"These spring-fed coastal areas are unique ecosystems that connect our land use practices directly to ocean health, and what happens to limu—which forms the base of our marine food web—affects everything from the fish we catch to the overall health of our coral reefs."

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