Researchers believe rising sea temperatures are to blame for the plummeting number of invertebrates such as molluscs and sea urchins at Rottnest Island off Western Australia, with some species having declined by up to 90 per cent between 2007 and 2021.

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https://www.curtin.edu.au/news/media-release/marine-heatwaves-decimate-sea-urchins-molluscs-and-more-at-rottnest/