RE: [AGA-Member] SYMPOSIUM ON AQUATIC PLANTS January 2006 Brussels

[Faruk Gençöz <fgencoz@metu.edu.tr>]

The location theory is interesting and seems to have evolutionary base. I
myself observe the same location spesificity in lakes and rivers here in
Turkey although not exactly as it is  mentioned in the theory. The
evolutionary explanations summerize million years of life experince and I
think this kind of viewpoint surpasses little individual variations.
Sometimes I see vallisneria or sagittaria species in the middle of a deep
river and find a huge colony of myriophyllum or potamogeton species in very
shallow sections. On the other hand I agree with the location theory that
different collonies of one specific species tend to be located in the
similar environmental conditions (e.g. light, speed of stream, depth) in the
same river.

Another interesting thing is that crypto melting seems a unique phenomena
among cryptos not among rosette plants. Other rosette plants which should
share the same location (according to the location theory) do not show an
immediate decay reaction. I never saw any echinodorus melted in one day
though vallisneria sometimes gets brown within one night.


Faruk


-----Original Message-----
From: aga-member-bounces@thekrib.com
[mailto:aga-member-bounces@thekrib.com]On Behalf Of Heather J Gladney
Sent: 22 Eylül 2005 Perþembe 09:29
To: Aquatic Gardeners Association Member Chat
Subject: Re: [AGA-Member] SYMPOSIUM ON AQUATIC PLANTS January 2006
Brussels


Faruk Gençöz wrote:

> I remember the article. Thanks.
>
> "might be adaptation to flood/dry cycles with sudden water-level and
> water chemistry changes?"
>
> This seems to be a very rational argument, if melting actually occurs
> in the wild. I wonder if someone actually observed such an event in
> the wild. I also want to know why this plant has a unique adaptation
> skill unlike what the stem plants regularly do.

I recall reading in a sometimes-unreliable older aquarium book that
these types occupy different depth and "width" zones along the stream
banks, where the small rosettes would be growing up on shady banks,
while the stem plants are out in deeper water but more direct sun (where
the water imposes a clearing between the trees that overhang the smaller
plants on the banks, is the theory).  It seems to me that too might have
appeared in one of the recent articles, possibly remarks by Diana Walstad??
Stem plants were cited as being in reliably deeper water than the
rosettes like smaller "groundcover" crypts, and when the crypts are
suddenly plunged in deep, different water after being grown emersed (dry
season in the wild) or semi-emersed (as they often are being grown
before sale in aquarium shops) then the CO2 difference alone might be
enough signal to tell them it's no use flapping leaves out there in the
flood, you won't get any light anyway, it's time to live on food stored
in the rhyzomes.
It's a theory.  I'm not sure how you'd go about proving it, but there's
probably some people who might've worked on issues like this (say,
"dry-matter productivity in diferent seasons," etc.) on plants in the wild.
Hope this is some help!

>
>
> ----- Original Message ----- From: "Heather J Gladney"
> <hgladney@comcast.net>
> To: "Aquatic Gardeners Association Member Chat" <aga-member@thekrib.com>
> Sent: Wednesday, September 21, 2005 10:45 PM
> Subject: Re: [AGA-Member] SYMPOSIUM ON AQUATIC PLANTS January 2006
> Brussels
>
>
>> Weren't there comments in the magazine awhile back (I believe in a
>> travel article with pictures showing crypts on-site?!?  There may
>> have been more than one reference?) suggesting that it might be
>> adaptation to flood/dry cycles with sudden water-level and water
>> chemistry changes?  Speculation by the aquarists, as best I recall,
>> no proof of it.
>> Anybody remember?
>> Heather
>>
>> Faruk Gençöz wrote:
>>
>>> "Cryptocoryne melting" might be a good title for an aquarist to
>>> submit a paper to the symposium. Has anyone encountered an example
>>> to crypto melting in their natural habitat? And would you have an
>>> idea about the ecological role of crypto melting? I am not
>>> questioning the role of regular melting seen among aquatic vascular
>>> plants. In this case, the lower portion of the stem decays so that
>>> the living upper part separates itself from the lower part to travel
>>> down the river. This way seems very practical and functional to find
>>> a suitable new place to reproduce and to enlarge the original
>>> colony. Crypto melting seems to be a liltle different. It occurs
>>> very fast and in general only the roots remain alive. So, rather
>>> than trying to survive in another place, this plant seems to try to
>>> re-generate possibly a more resistant generation. Why is that
>>> difference?
>>>
>>> Faruk
>>>
>>> ----- Original Message ----- From: "Faruk Gençöz" <fgencoz@metu.edu.tr>
>>> To: <aga-member@thekrib.com>
>>> Sent: Wednesday, September 21, 2005 10:19 PM
>>> Subject: [AGA-Member] SYMPOSIUM ON AQUATIC PLANTS January 2006 Brussels
>>>
>>>
>>>> ANNOUNCEMENT OF UPDATED WEBSITE
>>>> http://www.vub.ac.be/APNA/aquaticplantsymposium2006/welcome.html
>>>> REDUCED FEE FOR MSC STUDENTS
>>>> DEADLINE 01.11.2005
>>>> UPDATED PAYMENT INSTRUCTIONS
>>>>
>>>> International symposium on aquatic vascular plants: 25 years after
>>>> (Brussels 11-14 January 2006)
>>>>
>>>> On 11-14 Januari 2006, an International Symposium on Aquatic
>>>> Vascular Plants will be organised again at the Vrije Universiteit
>>>> Brussel, 25 years after its first edition. The aim is to bring
>>>> together aquatic plant scientists and ecologists from all over the
>>>> world, with emphasis on the following topics:
>>>> Molecular phylogeny and evolution
>>>> Phylogeography and patterns of distribution
>>>> Molecular ecology of populations
>>>> Survival strategies, dispersal and establishment
>>>> Autoecology and relationships with environment
>>>> Vegetation analysis and remote sensing applications
>>>> Biotic interactions and stable isotope applications
>>>>
>>>> Original contributions on aquatic vascular plants from freshwater,
>>>> brackish water and coastal zones are welcomed.  New insights using
>>>> DNA, stable isotopes, remote sensing, modelling etc. are envisaged
>>>>
>>>> 25 years ago on 23-25 January 1981, an International Colloquium on
>>>> Aquatic Vascular Plants was held in Brussels. The colloquium was
>>>> attended by 140 plant scientists and ecologists from 15 countries
>>>> and 70 presentations were scheduled.  The topics covered at that
>>>> time were pollination mechanisms, morphological variation and
>>>> development, cytology, photosynthesis, growth and reproductive
>>>> strategies, primary production, nutrient cycling, decomposition,
>>>> community analysis, distribution, conservation, introductions and
>>>> weeds.
>>>>
>>>> Important deadlines
>>>> 01.11.2005 Registration and payment
>>>> 01.11.2005 Abstract submission
>>>> More information at
>>>> http://www.vub.ac.be/APNA/aquaticplantsymposium2006/welcome.html
>>>> Responsible organisation: VUB APNA (Prof. dr. Ludwig Triest)
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> Prof. dr. Ludwig TRIEST
>>>> Algemene Plantkunde en Natuurbeheer (APNA)
>>>> (Plant Science and Nature Management)
>>>> Vrije Universiteit Brussel
>>>> Pleinlaan 2
>>>> B-1050 Brussel
>>>> Tel : +32 02 629 34 21
>>>> Fax : +32 02 629 34 13
>>>> ltriest@vub.ac.be
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