File:Gracilaria tikvahiae (graceful redweed) (Cayo Costa Island, Florida, USA) 1 (23689886804).jpg
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editDescriptionGracilaria tikvahiae (graceful redweed) (Cayo Costa Island, Florida, USA) 1 (23689886804).jpg |
Gracilaria tikvahiae McLachlan, 1979 - graceful redweed in Florida, USA (January 2016). Rhodophytes are red algae - they are the most common and widespread of marine macroalgae, but they often go unnoticed because of their frequently-dull coloration and nondescript growth forms. About 4000 species of red algae are known in the Holocene - most of them are marine, plus some freshwater forms. Rhodophytes are known in the fossil record. The oldest reported fossil red algae are from the upper Mesoproterozoic (~1.2 Ga) of northern Canada. Red algae vary in coloration - not all are reddish-colored. Rhodophytes can be red, pink, pale pinke, lavender, purple, brownish-red, whitish, and yellowish. Fleshy red algae are usually weed-like to mossy to fuzzy in appearance. Calcareous red algae have skeletons with calcium carbonate (CaCO3 - calcite or aragonite). Calcareous red algae are important reef organisms - they include branching forms and crusts. Upon death, the hard part skeletal components of calcareous red algae become biogenic sediments in reef and peri-reef environments. Gracilaria tikvahiae is a common species of fleshy red alga that occurs in the western North Atlantic Ocean (= eastern coastal areas of Canada & America) and the Gulf of Mexico (Florida to Mexico). Classification: Rhodophyta, Rhodophyceae, Gigartinales (or Gracilariales), Gracilariaceae Locality: high tide strand line on marine beach at the southern tip of Cayo Costa Island, Gulf of Mexico coast of southwestern Florida, USA (vicinity of 26° 36' 48.74" North latitude, 82° 13' 19.91" West longitude) More info. at: en.wikipedia.org/wiki/Red_algae and en.wikipedia.org/wiki/Gracilaria and www.sms.si.edu/irlspec/Gracil_tikvah.htm and onlinelibrary.wiley.com/doi/10.1111/j.1529-8817.2004.0307... |
Date | |
Source | Gracilaria tikvahiae (graceful redweed) (Cayo Costa Island, Florida, USA) 1 |
Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/23689886804. It was reviewed on 14 August 2016 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
14 August 2016
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current | 17:31, 14 August 2016 | 4,000 × 3,000 (3.89 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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Camera manufacturer | Canon |
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ISO speed rating | 80 |
Date and time of data generation | 15:40, 5 January 2016 |
Lens focal length | 6.2 mm |
Image title | |
Width | 4,000 px |
Height | 3,000 px |
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Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 11:35, 11 January 2016 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 15:40, 5 January 2016 |
Meaning of each component |
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APEX aperture | 2.96875 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 2.96875 APEX (f/2.8) |
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Focal plane resolution unit | inches |
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File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Portrait |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 04:35, 11 January 2016 |
Unique ID of original document | 2FAF874C0EA888C90C818269AF1EA678 |
IIM version | 24,704 |