Fossil study helps pinpoint extinction risks for ocean animals: When it comes to ocean extinctions, range size matters most

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What makes some ocean animals more prone to extinction? An analysis of roughly 500 million years of fossil data for marine invertebrates reveals that ocean animals with small ranges have been consistently hard hit, whereas population size has little effect. This means that reductions in range size -- such as when a species' habitat is destroyed or degraded -- could mean a big increase in long-term extinction risk, even when remaining populations are large, the authors say....
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