Photo: Supplied / Jean Thoral

A newly-named 'darkwave' phenomenon - where underwater light is blocked by sediment and other murk - can wreak havoc on marine ecosystems, New Zealand-led research has found.

The short-term events - which affect the entire underwater food chain - could increase in frequency as the climate warms, because many of them are driven by storms that churn up sediment or cause run-off from land.

University of Waikato researchers analysed up to 16 years of data from the Hauraki Gulf, the East Cape and California, and

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