[Odonata-l] FW: nymph update and other stuff

[Bob Glotzhober]

I am forwarding to the List Server a note from Linda Gilbert, along with
some questions. Linda is an interpretive naturalist with the Geauga
County Park District in northeastern Ohio and has really gotten into
dragonflies in the last couple of years. Linda has hatched out some
Aeshna eggs and reared them for 60 days so far. She will not be there,
but Larry Rosche will be sharing her images at our Ohio Odonata Society
annual meeting in Findlay, Ohio this Saturday. She has some neat
pictures. 

 

Her questions have to do with eggs laid in cattail stems that do not get
pushed down into the water over winter. If you have any insights or
facts to share, please be sure to send them both to her directly (she is
not on the list server), as well as to the list server.

 

Bob

 

====================

Robert C. Glotzhober             614/ 297-2633

Senior Curator, Natural History         bglotzhober at ohiohistory.org

Ohio Historical Society         Fax: 614/ 297-2546

1982 Velma Avenue

Columbus, Ohio  43211-2497

 

Visit the website of the Ohio Historical Society at:

  www.ohiohistory.org and check out our online collections catalog.

See or purchase Dragonflies and Damselflies of Ohio or the Cedar Bog
Symposium II at OHS's new E-Store:  http://www.ohiohistorystore.com/ 

Visit the Ohio Odonata website at:  
http://www.marietta.edu/~odonata/index.html

 

 

________________________________

From: Linda Gilbert [mailto:lkg38 at adelphia.net] 
Sent: Thursday, March 15, 2007 9:34 PM
To: Undisclosed-Recipient:;
Subject: nymph update and other stuff

 

Greetings everyone--

 

The nymphs are fine.  They are in their 8th instar and a little over 6mm
long.  60 days old.  So far so good.

 

On another related matter, I decided to check the clump of rush stems
from which I collected the dragon eggs last August.  The stems have been
exposed to the elements and burried under a foot or more of snow for the
past couple months.  Most of the snow has melted with this last milder
spell of weather, and I was interested to see if the remaining stems
that contained eggs had actually fallen into the water.  I relocated one
stem that had fallen over but was not submerged and took it in to look
at under the scope.  It was a surprise to see that at least one egg
showed signs of development.  An interesting thing I observed about this
particular stem was that it was moist inside--at least in the areas
surrounding the eggs where stems had been peeled back when the eggs were
laid.  The sections of the stem that did not have peelings was more dry,
though the inside stem tissue was still sort of spongy.  So moisture
must be the (or one of the)  requirement for development to begin
whether or not the stem is actually submerged.  What happens if the
stems don't fall in the water--do the eggs develop and hatch anyway as
long as they are moist and the nymphs crawl out and drop???  Do we know?
Attached is a powerpoint slide with pictures of the clump and the
embedded egg.

 

Cheers,

Linda

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