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- W2041330795 abstract "The iterative evolutionary radiation of planktic foraminifers is a well-documented macroevolutionary process. Here we document the accompanying size changes in entire planktic foraminiferal assemblages for the past 70 My and their relationship to paleoenvironmental changes. After the size decrease at the Cretaceous/Paleogene (K/P) boundary, high latitude assemblages remained consistently small. Size evolution in low latitudes can be divided into three major phases: the first is characterized by dwarfs (65–42 Ma), the second shows moderate size fluctuations (42–14 Ma), and in the third phase, planktic foraminifers have grown to the unprecedented sizes observed today. Our analyses of size variability with paleoproxy records indicate that periods of size increase coincided with phases of global cooling (Eocene and Neogene). These periods were characterized by enhanced latitudinal and vertical temperature gradients in the oceans and high diversity (polytaxy). In the Paleocene and during the Oligocene, the observed (minor) size changes of the largely low-diversity (oligotaxic) assemblages seem to correlate with productivity changes. However, polytaxy per se was not responsible for larger test sizes." @default.
- W2041330795 created "2016-06-24" @default.
- W2041330795 creator A5003760755 @default.
- W2041330795 creator A5061627377 @default.
- W2041330795 creator A5068753434 @default.
- W2041330795 date "2004-09-01" @default.
- W2041330795 modified "2023-10-17" @default.
- W2041330795 title "The evolutionary history of size variation of planktic foraminiferal assemblages in the Cenozoic" @default.
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