Utricularia benthamii traps : 無料・フリー素材/写真
Utricularia benthamii traps / jeans_Photos
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
|---|---|
| 説明 | In this photo you can see the "bladder traps" of this Utricularia near the edge of the container. Two types of bladder are visible. One that floats in/or above the waterline on long stalks. Others are visible under the water. Usually these are buried in the wet soil catching insects. I have pulled these out of the mud. Some of these traps were in very wet mud under the water, others were sitting on the top of mud.The water was approx. 20-50mm deep."Utricularia are carnivorous and capture small organisms by means of bladder-like traps. Terrestrial species tend to have tiny traps that feed on minute prey such as protozoa and rotifers swimming in water-saturated soil. The traps can range in size from 0.2 mm to 1.2 cm.[2] Aquatic species, such as U. vulgaris (common bladderwort), possess bladders that are usually larger and can feed on more substantial prey such as water fleas (Daphnia), nematodes and even fish fry, mosquito larvae and young tadpoles. Despite their small size, the traps are extremely sophisticated. In the active traps of the aquatic species, prey brush against trigger hairs connected to the trapdoor. The bladder, when "set", is under negative pressure in relation to its environment so that when the trapdoor is mechanically triggered, the prey, along with the water surrounding it, is sucked into the bladder. Once the bladder is full of water, the door closes again, the whole process taking only ten to fifteen milliseconds." Much more information Here: en.wikipedia.org/wiki/UtriculariaPhotos from 4 October 2016 |
| 撮影日 | 2016-10-04 13:39:37 |
| 撮影者 | jeans_Photos , Perth, Australia |
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| カメラ | NIKON D7100 , NIKON CORPORATION |
| 露出 | 0.005 sec (1/200) |
| 開放F値 | f/18.0 |
| 焦点距離 | 105 mm |