GSC102 TEST 2 F ORDOVICIAN

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7 Terms

1
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Ordovician snapshot

Gondwana crossed the South Pole, Iapetus closing, warm early, late cooling and glaciation, GOBE

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High sea level, Why did marine diversity increase

Widespread shallow seas, so more habitat

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Increasing oxygen, Why did marine diversity increase

Supports bigger, more active animals

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Nutrient Delivery, Why did marine diversity increase

More productivity, so bigger food webs

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Increasing ecological complexity, Why did marine biodiversity increase

More niches and more predator-prey interactions

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Extinction chain

Gondwana at South Pole → glaciation → sea-level fall → habitat loss

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Why can rapid change cause extinction even in successful groups?

Adapted to old conditions, can’t adapt or migrate fast enough