“ mohawk guy” and his band of neogene planktic foraminifer friends
Post on 23-Feb-2016
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“Mohawk Guy” and his Band of NeogenePlanktic 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
• 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
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)
Events that Changed Circulation
Geologic Time Scale
Distribution of forams in a typical tropical ocean
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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