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Aldrovanda forming turions

Started by Guest_Cecilia_* , Aug 15 2005 15:40 PM

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#1
Guest_Cecilia_*

Posted 15 August 2005 - 15:40 PM

Guests

Hi,

In May I received a few strands of Aldrovanda (strain unknown). To prevent them from going "extinct" they were set up in different environments (outside in a small sunny pond, inside in aquaria with/without fish and with/without DIY CO2-injection). To my great surprise, the strands placed in a jar (5L) with peat as bottom substrate on a NW windowsill have really thrived. The other portions look OK, but not more.
However, after a period of bad weather (less light) all the strans in the now qiite full jar has formed turions (not the other ones). So my question is: should I take the turions off and put them in the refrigerator over the winter (seems a bit odd to start winter dormancy in August) , or should I wait until the plant dies off? Can turions form as a result of nutritient depletion due to "massive" growth?

Cecilia (apologies for my bad english)

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#2
Alexander Nijman

Posted 20 September 2007 - 03:58 AM

Full Members
249 posts

Location:The Netherlands
Interests:Plants, gardening, travel.

Aldrovanda from Europe should be winterhardy. They grow as far north as near Lake Ladoga on 60 degrees latitude north. Aldrovanda from that provenance should be hardy in most parts of Sweden I guess. They grow in shallow microhabitats of just a few cm of water and the turions survive do in the ice. If you look at the pictures carefully of Lubomir Adamec you can see that Aldrovanda grows in those shallow microhabitats in Poland and Hungary. In those continental climates it can get far below minus 20 in cold winters!

Asiatic Aldrovanda is also found near Lake Khanka and the Khingansky Zapovednik in the Far East of Russia. During the winter the temperature in the Amur Vally can get below minus 40 celcius!
See the Ramsar papers of those to sites.

Regards,

Alexander