nannoplankton


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nannoplankton

[¦nan·ō′plaŋk·tən]
(biology)
Minute plankton; the smallest (usually from 2 to 20 nanometers) plankton, including algae, bacteria, and protozoans. Also spelled nanoplankton.
References in periodicals archive ?
As well, the record shows that more than 90 percent of the calcareous nannoplankton species went extinct at that time, and that most life disappeared from the upper portions of the ocean for almost a half million years, an effect geochemists call the "Strangelove Ocean.
At the Cretaceous-Paleogene boundary, 93 percent of the nannoplankton went extinct," said Timothy J.
Low-diversity opportunistic organisms that appear when other nannoplankton disappear persisted in the Northern Hemisphere for 40 thousand years after the impact and this hemisphere then took 270 thousand years to recover.
The darkness caused by the collision would impair photosynthesis and reduce nannoplankton reproduction.
Nannoplankton with calcium-based shells were the primary photosynthetic producers in the oceans until 65 million years ago, at the boundary between the Cretaceous and Palaeogene periods.
To trace the geographical distribution of the extinctions, Timothy Bralower from Pennsylvania State University in University Park and his colleagues examined published records that analysed fossil nannoplankton at 17 sites spread across the globe.
They found that up to 98 percent of species went extinct in the northern oceans, whereas rates in the southern ocean were lower; the most southerly site at the time lost 73 percent of its nannoplankton species.