Climate Change Impacts on Seagrass Species in Intertidal Meadows

Research conducted by scientists at Edith Cowan University has provided new insights into the effects of climate change on seagrass species in intertidal meadows. The study, which was supported by the Queensland Government, Queensland Government Smart Futures, Microsoft, and Edith Cowan University, investigated the response of five seagrass species to prolonged elevated water temperatures. The findings suggest that these species are vulnerable to ocean warming and marine heat waves, with some species, such as Halophila ovalis and Halophila spinulosa, being sensitive to temperatures exceeding 10 degrees C above ambient.

Key Takeaways:

• The study examined the effects of prolonged elevated water temperatures on five intertidal seagrass species, including Zostera muelleri, Halophila ovalis, Halodule uninervis, Halophila decipiens, and Halophila spinulosa.
• The research found that all species negatively responded to elevated water temperatures, but with notable interspecific variations in their reactions to prolonged warming stress.
• Two Halophila species, H. ovalis and H. spinulosa, are sensitive to temperatures exceeding 10 degrees C above ambient, while Halodule uninervis is the most tolerant of elevated water temperature.
• The study offers an initial understanding of how climate change might impact these seagrass species, whose ecological functions are not easily replaceable once lost.
• The research highlights the importance of effective management and restoration of seagrass species in intertidal meadows to mitigate the effects of climate change.

Statistics:

• 50 cm: The depth to which heat can penetrate substrate in intertidal seagrass meadows.
• 10 degrees C: The temperature threshold above which Halophila ovalis and Halophila spinulosa become sensitive.
• 30 days: The duration for which the seagrass species were exposed to elevated water temperatures.
• 5 species: The number of intertidal seagrass species examined in the study.

Sources:

• Varying Vulnerabilities: Seagrass Species Under Threat From Prolonged Ocean Warming. Limnology and Oceanography, 2025.
• Reports from Edith Cowan University Provide New Insights into Climate Change (Varying Vulnerabilities: Seagrass Species Under Threat From Prolonged Ocean Warming). Global Warming Focus, 2025.