L24 Life pelagic

L24 Life pelagic - Geol 107 L24 10/19/11 70% of the planet...

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Geol 107 L24 10/19/11 1 Life in the Surface Open Ocean Pelagic Life in an infinite volume of water. . 70% of the planet is ocean Open ocean - pelagic Seventy per cent of the world±s surface is covered by open ocean. Pacific Ocean is the largest and holds half the world±s water, the next largest is the Atlantic Ocean, followed by the Indian Ocean. Marine life is heavily concentrated in the top 200m. PLANKTON Phytoplankton in Open Ocean Ecosystems Types of phytoplankton (autotrophs) Cyanobacteria (blue Ͳ green algae) Diatoms (siliceous shells) Silicoflagellates (siliceous shells) Coccolithophores (carbonate shells Coccolithophores (carbonate shells) Key factors in phytoplankton growth Nutrients Light Temperature Means of staying afloat in photic zone Plankton and Predation There are two basic ways for phytoplankton to avoid getting eaten: By their small size (hard to see) By their translucent color (hard to see)
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Geol 107 L24 10/19/11 2 Zooplankton in Open Ocean Ecosystems Types of zooplankton (heterotrophs) Foraminifera (carbonate shells) Radiolarians (siliceous shells Radiolarians (siliceous shells) Copepods and Krill (Arthropoda) Key factors in zooplankton growth Must efficiently find food Must maintain position in water column Must avoid predators
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This note was uploaded on 11/21/2011 for the course ECON 404 taught by Professor Carrillo during the Spring '11 term at USC.

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L24 Life pelagic - Geol 107 L24 10/19/11 70% of the planet...

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