"Researchers with the University of South Florida say oyster reefs in Tampa Bay and along the Gulf Coast are facing a serious threat from changes to Florida's climate. Temperatures are increasing globally, and cold weather freezes and extremes in Florida are diminishing, which is a strong indicator that the state's climate is shifting from subtropical to tropical . . . In the water, researchers say they have noticed that mangroves were overtaking most oyster reefs in Tampa Bay and threaten the lives of other animals depending on oyster reef habitats . . . Shallow coast waters and remnant shorelines supported typical subtropical marine habitats for centuries in Tampa Bay, such as oyster reefs, seagrass beds, mud flats and salt marshes. However, a decrease in freezes allowed mangrove islands to replace previously dominant salt marsh vegetation and now have taken over oyster reef habitats that existed for centuries . . . The research team at USF says they found that 83% of tracked oyster reefs in Tampa Bay were fully converted to mangrove islands based on aerial images from 1938 to 2020. The rate of change has reportedly increased throughout the 20th century and after 1986, the Bay has seen a dramatic decrease in freezes, which is a factor that would typically get rid of mangroves naturally . . . Although mangroves provide benefits such as habitat for birds, certain ecosystems function specifically for oyster reefs as they improve water quality and coastal protection by reducing the impact of waves, researchers say. Oyster reefs can potentially be diminished or lost altogether as more reefs transition to mangrove islands and the loss of the oyster reefs' habitats will directly threaten reef-dependent species and wild oyster fisheries. . ."