Frogs Pawn

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They look particularly unimpressed at having their photo taken, I don't think I would be either considering the circumstances.
Do you think @Reiver was out walking and stumbled over this site whilst looking for his doggin it? :tongue:
 

Candaules

Well-Known Member
Location
England / France
[QUOTE 2940014, member: 9609"]Is that why she is looking so bloated, is she full of eggs waiting to be fertilised ? It always amazes me how much spawn hey produce, it as if they can produce a greater volume than themselves, even double or treble.[/quote]
That's right. She carries a mass of eggs that are fertilized as they leave her body. The jelly around each egg expands when it absorbs water, hence the huge bulk.
It's good to know that there are still places where frogs breed, as so many ponds have been drained.
 

Doseone

Guru
Location
Brecon
[QUOTE 2939437, member: 9609"]A lot of noise in the pond this last couple of nights, RRRiiiibbbiiiiittt - RRRiibbbiiittt - RRiiiibbiiiiitt So sneaked out tonight and caught them at it.... All seems a bit early to me, strange weather and all that.

(i guess those interesting circles are rain drops)

frogpawn_5133_zps76989c2b.jpg
[/quote]

Is that the froggie position?
 

Candaules

Well-Known Member
Location
England / France
[QUOTE 2940097, member: 9609"]"eggs that are fertilized as they leave her body" So presumably as there is no spawn this morning then nothing must have happened last night. I had guessed the eggs would be fertilised insdie her then leave some time later ?[/quote]
Mating frogs can stay in 'amplexus' for a long time. (I once set up a camera hoping to catch the moment, and they waited more than 24 hrs, and I missed it.) It's partly a preemptive move to stop other males getting to the female. She will lay the eggs when she is ready, and he will only fertilize them then. No internal fertilization in amphibians.

For the curious: http://en.wikipedia.org/wiki/Amplexus

Edit: I've just read the wiki page properly, and there are a few, very obscure, amphibians that can fertilize internally
 

Candaules

Well-Known Member
Location
England / France
="You said earlier the bulk of the spawn comes from The jelly around each egg expanding when it absorbs water - presumably this water will contain some male sperm and that is the mechanism for the fertilisation.

The jelly starts off as a thin layer, partly so that the sperm can penetrate it. Oddly, amphibian eggs are very easy to fertilize. A pin-prick can start them developing, with no sperm present. This is sometimes used as a laboratory technique. I seem to remember that this fact featured in the plot of Jurassic Park: dinosaur DNA was implanted in amphibian eggs, and later the dinosaurs were able to produce offspring without the presence of males.
 
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