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Posts tagged “Vernal Pools

Spotted Salamander Larvae

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A few short weeks ago spotted salamanders gathered at vernal pools to breed and lay eggs.  Since then their eggs have started hatching, and gilled spotted salamander larvae can now be found in these pools. The larvae are major predators and consume many insects and crustaceans, including mosquito larvae and fairy shrimp.  During the next two or three months, these larvae will develop lungs, absorb their feathery gills and begin life as terrestrial amphibians, assuming the temporary pool they’re in doesn’t dry up prematurely. (The two appendages, one on either side of its body in front of the gills, help the larva balance itself until its legs develop.)

 


Spotted Salamanders Emerge From Hibernation

Under the stealth of a rainy night, subterranean-dwelling spotted salamanders migrated to their ancestral breeding pools this week.  Groups, or “congresses,” of males gather, followed by females. Once a female locates a congress of males, she eventually pairs up with one of them. The pair of salamanders then engages in a courtship dance ending with the male depositing a tiny white packet of sperm called a spermatophore on the bottom of the vernal pool. If he has sufficiently stimulated the female, she picks up this packet into her cloaca, or vent, and fertilization takes place. The next morning the only sign that spotted salamanders have been and gone are the unclaimed spermatophores scattered on the leaves that lie on the pool bottom.  


Wood Frogs Arrive at Vernal Pools

After noticing the sudden loud clacking chorus at a nearby temporary woodland vernal pool, I went down to investigate, and there were dozens of wood frogs floating on the surface, as they croaked their duck-like quacks in the hopes of attracting female wood frogs.  As far as I could determine, they were out of luck on this, their first day at the breeding pool, as I don’t believe the females have arrived yet.  One clue was the relatively small size of the floating frogs and it seemed as though every frog was calling (only males call).  Plus, time after time a wood frog would swim up to another wood frog and attempt to grasp it only to have the object of its desire utter a “release” chirp (a call made only when a male clasps another male) and swim rapidly away.