File:Udotea flabellum (mermaid's fan alga) Bahamas.jpg
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[edit]DescriptionUdotea flabellum (mermaid's fan alga) Bahamas.jpg |
Udotea flabellum (Ellis & Solander, 1786) - mermaid's fan alga on shallow, aragonitic sandy seafloor. Udotea is a calcareous green alga - the fan-shaped blade has tiny particles of aragonite (CaCO3 - calcium carbonate). After the alga dies and the soft parts decay away, the aragonitic portions become clay- & silt-sized seafloor sediments. A significant percentage of shallow seafloor and shoreline sediments in the Bahamas is from calcareous algae. Many carbonate petrologists suggest that ancient fine-grained limestones (micritic limestones; micrites) are diagenetically altered deposits of calcareous green algae. Classification: Chlorophyta, Caulerpales, Halimedaceae Locality: shallow seafloor just west of North Point Peninsula, southeastern Graham's Harbour, northeastern San Salvador Island, eastern Bahamas |
Date | |
Source | Udotea flabellum (mermaid's fan alga) (San Salvador Island, Bahamas) 2 |
Author | James St. John |
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This image, originally posted to Flickr, was reviewed on 28 December 2014 by the administrator or reviewer Leoboudv, who confirmed that it was available on Flickr under the stated license on that date. |
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current | 00:48, 28 December 2014 | ![]() | 1,417 × 1,291 (617 KB) | Tillman (talk | contribs) | Cropped 28 % horizontally and 12 % vertically using CropTool with lossless mode. |
00:47, 28 December 2014 | ![]() | 1,965 × 1,467 (919 KB) | Tillman (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/1,000 sec (0.001) |
F-number | f/4.9 |
ISO speed rating | 80 |
Date and time of data generation | 10:13, 22 June 2010 |
Lens focal length | 18.6 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 01:53, 18 December 2014 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 10:13, 22 June 2010 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 9.9686668031948 |
APEX aperture | 4.5855635130041 |
APEX exposure bias | 0 |
Maximum land aperture | 4.5855635130041 APEX (f/4.9) |
Metering mode | Pattern |
Flash | Flash did not fire, auto mode |
Supported Flashpix version | 1 |
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Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Manual white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |
Supported Flashpix version | 1 |
Image width | 1,965 px |
Image height | 1,467 px |
Date metadata was last modified | 20:53, 17 December 2014 |
IIM version | 2 |