Bleaching is when higher than average water temperatures force coral to expel the algae that provide them with nutrients and color. The primary cause of this bleaching event is likely to be elevated sea temperature and solar radiation, exacerbated by lowered salinity on inshore and some offshore reefs in the central GBR. 98 of the Great Barrier Reef has been affected by coral bleaching Nov 15, 2021. La Grande barriera corallina(in ingleseGreat Barrier Reef) è la più grande estensione di corallo nel mondo, composta da oltre 2 900 barriere coralline singole e da 900 isole si estende per 2 300 km, su una superficie di circa 344 400 km². Ground-truth surveys of 23 reefs, which experienced bleaching in intensities ranging from none to extreme, showed that the aerial survey data are likely to be underestimates of the true extent and intensity of bleaching on the GBR. Fewer offshore reefs (14%) showed high levels of bleaching while none showed extreme levels of bleaching. Of inshore reefs 67% had high levels of bleaching (>10% of coral) and 25% of inshore reefs had extreme levels of bleaching (>60% of coral). Broad-scale aerial surveys conducted of 654 reefs (∼23% of reefs on the GBR) in March and April 1998, showed that 87% of inshore reefs were bleached at least to some extent (>1% of coral cover) compared to 28% of offshore (mid- and outer-shelf) reefs. Mild bleaching commenced in late January and intensified by late February/early March 1998. The Great Barrier Reef (GBR) experienced its most intensive and extensive coral bleaching event on record in early 1998.
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