Weaker sharks are less effective hunters, which can upset the balance of the ecosystem, say authors of study into impacts of hotter oceans

Baby sharks will emerge from their egg cases earlier and weaker as water temperatures rise, according to a new study that examined the impact of warming oceans on embryos.

About 40% of all shark species lay eggs, and the researchers found that one species unique to the Great Barrier Reef spent up to 25 days less in their egg cases under temperatures expected by the end of the century.

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