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Cretaceous傍ertiary extinction event

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Author Topic: Cretaceous傍ertiary extinction event  (Read 1548 times)
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Quasar
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« on: June 29, 2009, 01:13:25 pm »

Extinction patterns

Even though the boundary event was severe, there was significant variability in the rate of extinction between and within different clades. Because atmospheric particles blocked sunlight, reducing the amount of solar energy reaching the Earth's surface, species that depended on photosynthesis declined or became extinct. Photosynthesizing organisms, including phytoplankton and land plants, formed the foundation of the food chain in the late Cretaceous as they do today. Evidence suggests that herbivorous animals died out when the plants they depended on for food became scarce; consequently, top predators such as Tyrannosaurus rex also perished.[8]

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