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Source page: |
http://commons.wikimedia.org/wiki/File:Alsomitra_macrocarpa_seed_(syn._Zanonia_macrocarpa).jpg |
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Summaryedit
Description |
Kebun Raya, Bogor, Indonesia. A bit of flowery prose from an essay that I wrote in 2001 on wind-dispersed seeds & fruits: "Every now and then, field botanists are treated to transcendental moments when the light is golden, the air is fresh, interesting plants are at hand, and the hardships of field work just melt away. During those times, scientific insights arrive with astonishing clarity and grace. One such moment for me came on a sunny afternoon in the Kebun Raya Botanic Garden, in Bogor, Indonesia, some years ago. On that memorable day, I was transfixed as I watched dozens of winged seeds of Alsomitra macrocarpa (Cucurbitaceae, the squash family) glide to the ground in broad, lazy spirals. The seeds spilled out from a fruit hanging on the liana climbing on one of the enormous old trees in the garden. All the principles of aerodynamics as they relate to seed dispersal were manifest in that one lovely moment. "The gliding seeds of Alsomitra exhibit two kinds of motion: The forward gliding motion, which takes the seed on a helical, downward path, and phugoid oscillations, in which the gliding seed gains lift, stalls, drops briefly until it accelerates enough to generate lift, starting the process over again. Phugoid oscillations are well known to aviation engineers and model airplane fliers, because they can destabilize mechanized flight, but in the seeds of Alsomitra, phugoid oscillations add a graceful rhythm to the descent, and more importantly, slow the descent of the seeds giving them more time aloft. Time aloft is the sine qua non of successful dispersal by wind." |
Date | |
Source | Alsomitra macrocarpa seed (syn. Zanonia macrocarpa) |
Author | Scott Zona from Miami, Florida, USA |
Licensingedit
This file is licensed under the Creative Commons Attribution 2.0 Generic license. | ||
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This image was originally posted to Flickr by scott.zona at https://www.flickr.com/photos/12017190@N06/5616740256. It was reviewed on by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
Licensingedit
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This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license. | |
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This image was originally posted to Flickr by scott.zona at https://www.flickr.com/photos/12017190@N06/5616740256. It was reviewed on by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
EXIF data: | |
File name | alsomitra_macrocarpa_seed__syn._zanonia_macrocarpa_.jpg |
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Size, Mbytes | 8.8625361328125 |
Mime type | image/jpeg |
Camera manufacturer | Nikon |
Camera model | Nikon SUPER COOLSCAN 5000 ED |
Orientation of image | 1 |
Image resolution in width direction | 350 |
Image resolution in height direction | 350 |
Unit of X and Y resolution | 2 |
Exposure time | 0/1000000 sec (0) |
F number | f / 0 |
Compressed bits per pixel | 0 |
Exif version | 0220 |
Lens focal length | 0 mm |
Shutter speed | 0 |
Aperture | 0 |
Brightness | 0 |
Exposure bias | 0 |
Maximum lens aperture | 0 |
Supported Flashpix version | 0100 |
Color space information | 65535 |
Exif image width | 3940 |
Exif image length | 2620 |
Focal plane X resolution | 0 |
Focal plane Y resolution | 0 |
Exposure index | 0 |
Software used | Adobe Photoshop CS4 Macintosh |
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