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Ten Plants That Put Meat on Their Plates
In addition to the well-known Venus flytrap, many other plant species feed on bugs or crustaceans
By Sarah Zielinski
Smithsonian.com, January 08, 2010
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(Royal Botanic Gardens, Kew in England)
Venus flytrap
The Venus flytrap (Dionaea muscipula) is probably the best known of the more than 600 species of carnivorous plants, which absorb nutrients from prey rather than through their roots. The flytrap grows in the wild only in wet pine savannas of the U.S. Carolinas, a habitat slowly disappearing because of land development. Despite its name, the Venus flytrap catches more ants, beetles and other crawling things than flies.
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Poaching the Venus Flytrap
Researchers are able to track Venus flytrap plants that were stolen from protected areas
Comments
Is there a genus of actively trapping carnivorous plants called Utricularia spp. ? ( bladderwort ) This would seem to contradict the statement in the description of waterwheel that only two species do this .
Posted by Bob Dalrymple on January 22,2010 | 09:45AM
Bladderworts are more like lobster traps in which bugs fly in and then become trapped.
Posted by Sarah Zielinski on January 27,2010 | 07:10AM
Actually the bladderwort is active in capturing its prey. The closed bladder when its trigger is stimulated by a small animal suddenly opens creating a suction which pulls in the animal and traps it. Digestion occurs and the bladderwort receives some nutrition. I found some in a lake on Mt. Desert Island in Maine once.
Posted by Sinclair Hamilton on February 8,2010 | 07:48AM
I suggest reading the wikipedia article (http://en.wikipedia.org/wiki/Utricularia#Trapping_mechanism) to be clear about the trapping mechanism. It is neither like a venus fly trap nor is it at all like a lobster trap. The plant does not activate it in response to stimuli as is the case with the venus fly trap or waterwheel. Rather, it uses suction to maintain a vacuum in its bladders which are sealed with sets of fine hair-like triggers. A small disruption in the trigger disrupts the seal, causing the water to rush into the bladder. Then the same suction action which created the vacuum also serves to keep the prey trapped there.
This is entirely different from a lobster trap which is just based on having a large opening for the entrance side which leads to a small opening on the inside. But it is also not like a venus fly trap or waterwheel where the plants actually move themselves in response to stimuli. I would probably describe the bladderwort's trap as "active" because of its dynamic nature (and to contrast it against plants which trap only via sticky substances, which it clearly does not do), but it isn't the same as the other two mentioned.
That said, I do still fault the original sentence because I would argue that some sundews should also count as active. Although they use a sticky substance to ensnare their prey, many also actively curl around their prey in order to maximize the contact and hence minimize the possibility of escape. Without this curling motion they are not as effective.
Posted by Keith Irwin on February 10,2010 | 01:27PM
I was disappointed at the omission of Utricularia. However they do not actively trap; the trap while sophisticated is purely mechanical and works even when the plant cells are killed.
Posted by jon w on February 10,2010 | 02:16PM
There are also Venus flytraps in the marshy bogs of the Blue Hill reservation in eastern Massachusetts, along with pitcher plants.
Posted by mofembot in france on February 11,2010 | 11:06AM