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“ Mohawk Guy” and his Band of Neogene Planktic Foraminifer Friends

“ Mohawk Guy” and his Band of Neogene Planktic Foraminifer Friends. Ocean Circulation. We have one big ocean, separated into a number of basins One thing can affect another, even if it is in another region. Changes in Ocean Circulation.

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“ Mohawk Guy” and his Band of Neogene Planktic Foraminifer Friends

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  1. “Mohawk Guy” and his Band of Neogene Planktic Foraminifer Friends

  2. Ocean Circulation • We have one big ocean, separated into a number of basins • One thing can affect another, even if it is in another region

  3. Changes in Ocean Circulation • Changes to ocean circulation patterns in the past have changed the temperature of ocean water • Surface water, deep ocean circulation and the location of the thermocline may be affected • Availability of nutrients may also be affected • ……This will result in a change to foram structure and distribution throughout time

  4. JOIDES ResolutionODP Leg 130, Hole 806 B • 0 19.11’ N, 159 21.69’ E • February 18, 1990 – February 22, 1990 • 230 samples examined (110 planktonic foraminifer species identified)

  5. Events that Changed Circulation

  6. Geologic Time Scale

  7. Distribution of forams in a typical tropical ocean

  8. Important Concepts – Biological/Environmental • Changes in a population can be triggered by environmental causes • seasonal changes, dissolved oxygen, pH, temperature, water clarity, salinity or depth • As one species becomes extinct, other species may move into that niche and replace it. • EX: hunting wolves to extinction can lead to an explosion in deer populations. • climactic changes can cause populations to move into different regions

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