Anomalous shifts in tropical Pacific planktonic and benthic foraminiferal test size during the Paleocene/Eocene thermal maximum
Articolo
Data di Pubblicazione:
2006
Citazione:
Anomalous shifts in tropical Pacific planktonic and benthic foraminiferal test size during the Paleocene/Eocene thermal maximum / K. Kaiho, K. Takeda , M. R. Petrizzo, J. Zachos. - In: PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY. - ISSN 0031-0182. - 237:2(2006), pp. 456-464.
Abstract:
Paleocene–Eocene warming and changes in oceanic hydrography should have significantly impacted the ecology of marine microorganisms, both at the surface and on the seafloor. We analyzed several key characteristics of foraminifera from two Shatsky
Rise (ODP Leg 198) cores spanning the P/E boundary including the maximum test diameters of the largest calcareous trochospiral benthic foraminifera and largest shallow-dwelling planktonic foraminifera, and the stable carbon and oxygen isotope ratios of benthic foraminifera and bulk samples. We also qualitatively constrained changes in bottom water dissolved oxygen concentrations
by quantifying changes in benthic species abundances. We find warming synchronous with an unusual increase in the size of surface-water planktonic in contrast to deep-water benthic foraminifera which decrease in size. We suggest that a decline in bottom water dissolved oxygen is the primary mechanism responsible for the size reduction of Pacific deep-sea benthic foraminifera, whereas the contemporaneous size increase of surface-water planktonic foraminifera is attributed to an increase in thermal stratification and decrease in local nutrient supply.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Benthic foraminifera; Planktonic foraminifera; Size; Dissolved oxygen; Nutrient; Stable isotope; Paleocene; Eocene
Elenco autori:
K. Kaiho, K. Takeda , M. R. Petrizzo, J. Zachos
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