File:Padina jamaicensis (white scroll alga) (San Salvador Island, Bahamas) 2 (15860814380).jpg
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[edit]DescriptionPadina jamaicensis (white scroll alga) (San Salvador Island, Bahamas) 2 (15860814380).jpg |
Padina jamaicensis (Collins, 1901) - white scroll algae on shallow, aragonitic sandy seafloor. The chalky whitish appearance of this species of brown algae is the result of the presence of tiny particles of calcium carbonate (aragonite, CaCO3) on the surface of the blade. 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. Classification: Phaeophyta, Dictyotales, Dictyotaceae Locality: shallow seafloor just west of North Point Peninsula, southeastern Graham's Harbour, northeastern San Salvador Island, eastern Bahamas |
Date | |
Source | Padina jamaicensis (white scroll alga) (San Salvador Island, Bahamas) 2 |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15860814380. It was reviewed on 3 May 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
3 May 2015
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/250 sec (0.004) |
F-number | f/4.5 |
ISO speed rating | 80 |
Date and time of data generation | 14:38, 18 June 2012 |
Lens focal length | 14.303 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 02:09, 18 December 2014 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 14:38, 18 June 2012 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 7.96875 |
APEX aperture | 4.34375 |
APEX exposure bias | 0 |
Maximum land aperture | 4.34375 APEX (f/4.51) |
Metering mode | Pattern |
Flash | Flash did not fire, auto mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905349794 |
Focal plane Y resolution | 16,483.516483516 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Manual white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |
Supported Flashpix version | 1 |
Image width | 2,217 px |
Image height | 1,545 px |
Date metadata was last modified | 21:09, 17 December 2014 |
IIM version | 2 |