Kalkflagellater

Gophyrocapse oceanica

Kalkflagellater (eller coccolithophorider) er gulalger. Fytoplankton og nanoplankton; encellede havlevende organismer i størrelsen 15-100 mikrometer med en overflade af kokkolitter, kalkplader i størrelsen 2-25 mikrometer. Fortidige kalkflagellaters kokkoliter udgør en stor del af kridtet i Danmarks undergrund.

Fytoplankton Emiliania huxleyi* blomstrer i den engelske kanal i 1999
Kalkflagellater blomstrer i Beringshavet i 1998
Coccolithus pelagicus

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Cwall99 lg.jpg
Under certain conditions, en:Emiliania huxleyi can form massive blooms which can be detected by satellite remote sensing. What looks like white clouds in the water, is in fact the reflected light from billions of coccoliths floating in the water-column.

en:Landsat image from 24th July en:1999, courtesy of Steve Groom, en:NEODAAS, Plymouth Marine Laboratory. This bloom attracted considerable coverage in the UK media.

Coccolithophore bloom.jpg
NASA SeaWiFS image taken on April 25, 1998, showing the en:coccolithophore en:bloom in the en:Bering Sea. This is not a false-color image: the greenish color is caused by the high concentration of en:phytoplankton. NB Subsequent research suggests that this image, and others from the area showing bright waters early in the year, probably show resedimented particles not an active coccolithophore bloom (Broerse et al. 2003, Continental Shelf Research, 23, 1579-1596).
Gephyrocapsa oceanica color.jpg
Forfatter/Opretter: Photo by NEON ja, colored by Richard Bartz, Licens: CC BY-SA 2.5
Gephyrocapsa oceanica KAMPTER from Mie Prefecture, Japan. The image was taken by means of a scanning electron microscope (JEOL JSM-6330F), hence the colors are artificial. Scale bar = 1.0 μm.
Coccolithus pelagicus.jpg
Forfatter/Opretter: Richard Lampitt, Jeremy Young, The Natural History Museum, London, Licens: CC BY 2.5

Coccolithus pelagicus ssp. braarudii.

Coccolithus pelagicus; coccosphere. Location: N. Atlantic; 48N, -20E; 3200m

image sets Taxa - Coccolithophores - London NHM/Roscoff