University of Missouri study challenges assumptions about biodiversity near Earth’s first reef systems.

Over the past decade, the fast-growing seaweed Caulerpa prolifera has taken over seagrass in Florida’s Indian River Lagoon. While this seaweed provides some habitat, it supports fewer marine species than the original seagrass, signaling a decline in biodiversity. Now, scientists are closely monitoring an unexpected player: small, green sap-sucking sea slugs that feed on C. prolifera and have surged in number. Their presence is prompting new questions about habitat loss, potential pathways for ecosystem recovery, and the uncertain future of marine life in a seagrass-depleted environment.

New research from the University of Georgia’s Odum School of Ecology and Marine Extension and Georgia Sea Grant suggests there may be elevated levels of mercury in Georgia and South Carolina waters.