The study tests 3 hypotheses: a) that late Miocene to early
Pliocene constriction and complete closure of the Central American
Seaway (CAS), caused decreased productivity in the Caribbean, b)
reduced paleoproductivity resulted in decreased diversity in the
Caribbean and, c) this decreased availability of food (reduced
paleoproductivity) was responsible for larger mean test size in the
three most common benthic foraminiferal species Epistominella
exigua, Oridorsalis umbonatus and Globocassidulina subglobosa. The
hypotheses are tested by applying correlation analysis to 7 groups
of paleoceanographic proxies, 3 indices of diversity measures and
mean test size data from the Caribbean ODP Site 999, to 47 core
samples between 8.3-2.5 Ma.Study concludes: a) the gradual closure
of the CAS led Caribbean diversity and paleoproductivity to
decrease abruptly at 7.9 Ma, when the nutrient-rich Pacific deep
waters were cut off, and then, again with the complete closure of
the seaway at 4.2 Ma, b) Caribben diversity and paleoproductivity
are positively correlated and, c) that the availability of food
influences mean test size; lower availability and decreased
abundances lead to larger test size.
General
Imprint: |
Lap Lambert Academic Publishing
|
Country of origin: |
Germany |
Release date: |
July 2011 |
First published: |
July 2011 |
Authors: |
Sreepat Jain
|
Dimensions: |
229 x 152 x 9mm (L x W x T) |
Format: |
Paperback - Trade
|
Pages: |
144 |
ISBN-13: |
978-3-8454-1156-9 |
Categories: |
Books >
Earth & environment >
Earth sciences >
General
|
LSN: |
3-8454-1156-2 |
Barcode: |
9783845411569 |
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