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Datoteka:Alsomitra macrocarpa seed (syn. Zanonia macrocarpa).jpg

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Sažetak

Opis

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."
Datum
Izvor Alsomitra macrocarpa seed (syn. Zanonia macrocarpa)
Autor Scott Zona from Miami, Florida, USA

Licenciranje

w:bs:Creative Commons
pripisivanje
Ova datoteka je licencirana pod Creative Commons Attribution 2.0 generičkoj licenci.
Slobodni ste:
  • da dijelite – da kopirate, distributirate i prenosite djelo
  • da remiksate – da prilagodite djelo
Pod sljedećim uslovima:
  • pripisivanje – Morate pripisati odgovarajuće autorske zasluge, osigurati link ka licenci i naznačiti jesu li napravljene izmjene. To možete uraditi na bilo koji razumni način, ali ne tako da se sugerira da davalac licence odobrava Vas ili Vašu upotrebu njegovog djela.
This image was originally posted to Flickr by scott.zona at https://www.flickr.com/photos/12017190@N06/5616740256. It was reviewed on 4 maj 2011 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

4 maj 2011

Licenciranje

w:bs:Creative Commons
pripisivanje dijeli pod istim uslovima
Ova datoteka je licencirana pod Creative Commons Attribution-Share Alike 2.0 generičkom licencom.
Slobodni ste:
  • da dijelite – da kopirate, distributirate i prenosite djelo
  • da remiksate – da prilagodite djelo
Pod sljedećim uslovima:
  • pripisivanje – Morate pripisati odgovarajuće autorske zasluge, osigurati link ka licenci i naznačiti jesu li napravljene izmjene. To možete uraditi na bilo koji razumni način, ali ne tako da se sugerira da davalac licence odobrava Vas ili Vašu upotrebu njegovog djela.
  • dijeli pod istim uslovima – Ako mijenjate, transformišete ili nadograđujete ovaj materijal, morate ga objaviti i distribuirati samo pod istom ili sličnom licencom poput ove.
This image was originally posted to Flickr by scott.zona at https://www.flickr.com/photos/12017190@N06/5616740256. It was reviewed on 4 maj 2011 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

4 maj 2011

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Alsomitra macrocarpa engleski

objavljeno u

Flickr engleski

datum objavljivanja: 13 april 2011

media type engleski

image/jpeg

checksum engleski

e933543cea67eb79a5e9629b3ac02855b7fb74cd

metoda određivanja: SHA-1 engleski

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9.075.237 Bajt

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2.620 piksel

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trenutno11:44, 4 maj 2011Smanjeni pregled verzije na dan 11:44, 4 maj 20113.940 × 2.620 (8,65 MB)RicReis{{Information |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

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