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Minor Hotels celebrates International Chef’s Day with South African Chefs making…As tropical and subtropical coral reefs succumb to bleaching due to climate change in many parts of the world, the idea that they could take refuge in cooler, temperate seas has offered cause for hope.
TATEYAMA, Japan — The late summer heat was no concern for University of Tokyo professor Nina Yasuda and her student research team, who descended on Tateyama, an aging resort town on the southeastern tip of Tokyo Bay, armed with snorkels, flippers, GPS devices and tools for DNA analysis one early September day. Their objective was under the waves: Tateyama’s growing coral communities.
As this biodiversity crisis unfolds, the idea that tropical and subtropical corals could take refuge in cooler, temperate seas has offered cause for hope. That idea seemed to fit into a larger, global phenomenon of “,” in which species associated with the tropics are becoming more abundant poleward as temperatures rise, often leading to drastic ecosystem changes. A 2011, for example, claimed to show the first large-scale evidence of “the expansion of tropical species ranges to temperate areas.
As in many parts of the world, Japan’s subtropical coral reefs in the Ryukyu Archipelago, the country’s southernmost extent, have experienced bleaching. A 2017 government survey, for example, found that 70% of coral in the Ryukyu Archipelago’s Sekisei Lagoon hadfrom a major bleaching event the previous year. Although bleaching isn’t necessarily fatal if temperatures return to a habitable level, extended periods of high temperatures can be devastating.
Another researcher, University of the Ryukyus professor James Reimer, told Mongabay he observed various changes to coastal ecosystems during a survey of coral communities in the Ryukyu Archipelago and temperate Shikoku and Honshu that he completed earlier this year. Mirroring Mezaki, he said what’s happening is not just temperate coral “range expansion, but it is a changing of an ecosystem — or changing of many ecosystems into many other ecosystems.
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