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GCN egg laying material

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Caudata View Drop Down
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    Posted: 11 Jan 2011 at 1:27pm

What do people think the likelihood is of GCN laying eggs on dead leaves in the base of woodland ponds with little or no aquatic macrophyte growth? I have never come across it however it seems a distinct possibility to me.

Any thoughts or experience?

Thankyou.  

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will View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote will Quote  Post ReplyReply Direct Link To This Post Posted: 12 Jan 2011 at 4:15pm
Hi

often done in woodland ponds - see photo

cheers

Will


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Matt Harris View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Matt Harris Quote  Post ReplyReply Direct Link To This Post Posted: 12 Jan 2011 at 5:22pm
I think they'll lay on pretty much anything, I've seen them on dead leaves and even stones where there were no leaves. The poroblem is of course that these eggs may be more vulnerable to predation than those safely wrapped up in a leaf.
Local Authority Ecologist
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Caudata View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Caudata Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jan 2011 at 11:18am

Thanks alot for these replies. Greatly appreciated.

Do either of you know if there is a reference to this in any scientific papers or books etc. Just so I can reference any of this in reports.

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will View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote will Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jan 2011 at 4:27pm
sorry mate, don't know of any references - just a lifetime misspent at the water's edge!
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Noodles View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Noodles Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jan 2011 at 2:30pm
I would imagine that UV levels and temperatures would be
much lower at the base of a shaded pool. Possibly also
higher predation rates as a result of bottom dwelling
inverts, a weaker protective leaf barrier and a more
conspicuous contrast in egg colour/increased risk of
bacterial/fungal infection. In short I doubt it would be
the selected choice for GCN oviposition.

Having said all that I have found eggs on decaying
leaves. Newly fallen ones after heavy winds are commonly
used as are many other objects such as the fibrous roots
of Sallow scrub.

Try poking a few (say Crack Willow) twigs with leaves on
the end into the silt and check them at a later date.
This may save on the hard search!, depending on what the
survey is for.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Caudata Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 2011 at 9:37am
Thanks for the responses. I am doing some management plans for HLS on some ponds, which are as I described heavily shaded, with no vegetation. So was just considering the possibilities of GCN using them. They scored quite high index scores (other than vegetation and shade), so after this info I will possibly advise a GCN survey before any work is carried out.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ewan Quote  Post ReplyReply Direct Link To This Post Posted: 21 Jan 2011 at 6:30pm
Hi
I've found this quite often. If you can't see the usual spawn plants, or even any aquatic plants, then scoop your net gently along the surface sediment of the pond and carefully pick through the dead leaves looking for eggs. Generally they will still be folded over. I've found them in the dead leaves of various broadleaved tree sp as well as in mushy dead leaves of various emergent reeds- iris/sparganium/typha etc.
Good luck.

Ewan Shilland
Contract Research Scientist
Environmental Change Research Centre
University College London
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