Frog Porn

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jmchaffie

jmchaffie

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Noticed this pair of upland chorus frogs in amplexus, or the mating clasp, in a small vernal pool yesterday. Female body length is ~1 inch long - quarter sized. The pool- actually no more than a 4 foot long “puddle” - also contained eggs, presumably from this same species. #5 is a ~3x mag image of the eggs (w/ a Raynox lens); you can just begin to make out the developing cell mass inside.
Long Creek Park, Winston Salem, NC
Olympus OM-D E-MI Mark iii w/ Olympus 60mm, Raynox
Focus bracket, natural light, ~ 1/20 - 1/400 sec at f/5.6, iso 200, 15 jpg images stacked with Focus Stacker 1.5.

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Nice shots. Thanks for sharing. Haven't checked recently but I believe in Canada all frogs are "at threat" or "endangered." A true shame; beautiful animals. Grew up with a marsh behind our house (we called it a swamp then :) ) and the frog songs were incredible (and LOUD) there were so many frogs of three or four different types, at least. The bullfrogs were so big.
 
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jmchaffie said:
Noticed this pair of upland chorus frogs in amplexus, or the mating clasp, in a small vernal pool yesterday. Female body length is ~1 inch long - quarter sized. The pool- actually no more than a 4 foot long “puddle” - also contained eggs, presumably from this same species. #5 is a ~3x mag image of the eggs (w/ a Raynox lens); you can just begin to make out the developing cell mass inside.
Long Creek Park, Winston Salem, NC
Olympus OM-D E-MI Mark iii w/ Olympus 60mm, Raynox
Focus bracket, natural light, ~ 1/20 - 1/400 sec at f/5.6, iso 200, 15 jpg images stacked with Focus Stacker 1.5.

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Beautiful. Nice job. Thanks for sharing!
 
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jmchaffie said:
Noticed this pair of upland chorus frogs in amplexus, or the mating clasp, in a small vernal pool yesterday. Female body length is ~1 inch long - quarter sized. The pool- actually no more than a 4 foot long “puddle” - also contained eggs, presumably from this same species. #5 is a ~3x mag image of the eggs (w/ a Raynox lens); you can just begin to make out the developing cell mass inside.
Long Creek Park, Winston Salem, NC
Olympus OM-D E-MI Mark iii w/ Olympus 60mm, Raynox
Focus bracket, natural light, ~ 1/20 - 1/400 sec at f/5.6, iso 200, 15 jpg images stacked with Focus Stacker 1.5.

View attachment 34736

View attachment 34737

View attachment 34738
View attachment 34739

View attachment 34741
Click to expand...
Great series John, the first series of eggs (shot no 4) are only recently fertilised, and shot 5 shows the embryos at stage 7 (approx. 32-cell stage) using the Gosner (1970) staging table for frog eggs. It is great to see the individual cells and these are visible even with the naked eye. So much easier to study embryology with frog eggs than humans!!
 
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Marion Anstis said:
Great series John, the first series of eggs (shot no 4) are only recently fertilised, and shot 5 shows the embryos at stage 7 (approx. 32-cell stage) using the Gosner (1970) staging table for frog eggs. It is great to see the individual cells and these are visible even with the naked eye. So much easier to study embryology with frog eggs than humans!!
Click to expand...

Many thanks for supplying the relevant developmental information, Marion. I faintly remember the word "blastula" from college embryology which, I believe, is synonymous with stage 7. Very surprised this kind of detail could be detected in eggs bobbing around in pond water!
 
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