Coral Invasion Threatens Tokyo Bay Ecosystem
A coral species native to southern Japan, Acropora squarrosa, has spread to Tokyo Bay, creating a vibrant coral reef near the Boso Peninsula. This northward expansion is attributed to rising ocean temperatures caused by global warming.
The coral's presence poses a threat to the existing ecosystem. Its rapid growth has led to the decline of abalone and turban shells, which feed on seaweed. Additionally, the table-shaped corals block sunlight, further impacting seaweed growth and affecting fisheries.
Experts believe that the Kuroshio current is carrying coral eggs and larvae from southern waters to Tokyo Bay. This, coupled with the prolonged meandering of the current since 2017, has facilitated the transfer of 40 to 50 coral species to the area.
Meanwhile, rising ocean temperatures in southern Japan are causing coral bleaching, a phenomenon where corals expel photosynthetic cells and turn white. This has led to the death of coral colonies in areas like Amami-Oshima island.
The contrasting situations in Tokyo Bay and southern Japan highlight the complex impact of climate change on marine ecosystems. While some areas experience coral proliferation, others face the risk of coral extinction.
Experts emphasize the need for urgent action to mitigate climate change and slow the rate of ocean warming. This includes reducing carbon dioxide emissions and implementing other measures to protect marine ecosystems.