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| Titel |
The response of calcifying plankton to climate change in the Pliocene |
| VerfasserIn |
C. V. Davis, M. P. S. Badger, P. R. Bown, D. N. Schmidt |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 9 ; Nr. 10, no. 9 (2013-09-30), S.6131-6139 |
| Datensatznummer |
250085341
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| Publikation (Nr.) |
 copernicus.org/bg-10-6131-2013.pdf |
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| Zusammenfassung |
| As a result of anthropogenic pCO2 increases, future oceans
are growing warmer and lower in pH and oxygen, conditions that are
likely to impact planktic communities. Past intervals of elevated
and changing pCO2 and temperatures can offer a glimpse
into the response of marine calcifying plankton to changes in
surface oceans under conditions similar to those projected for the
future. Here we present new records of planktic foraminiferal and
coccolith calcification (weight and size) from Deep Sea Drilling Project Site 607
(mid-North Atlantic) and Ocean Drilling Program Site 999 (Caribbean Sea)
from the Pliocene, the last time that pCO2 was similar to
today, and extending through a global cooling event into the
intensification of Northern Hemisphere glaciation (3.3 to 2.6 million years ago). Test weights of both surface-dwelling
Foraminifera Globigerina bulloides and thermocline-dwelling
Foraminifera Globorotalia puncticulata vary with
a potential link to regional temperature variation in the North
Atlantic, whereas in the tropics Globigerinoides ruber test
weight remains stable. In contrast, reticulofenestrid coccoliths
show a narrowing size range and a decline in the largest lith
diameters over this interval. Our results suggest no major changes
in plankton calcite production during the high pCO2 Pliocene or
during the transition into an icehouse world. |
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