Hydra hymanae: regulation of the life cycle by time and temperature.

@article{Davison1976HydraHR,
  title={Hydra hymanae: regulation of the life cycle by time and temperature.},
  author={John Davison},
  journal={Science},
  year={1976},
  volume={194 4265},
  pages={618-20}
}
Hydra hymanae, a hermaphroditic freshwater coelenterate, reproduces asexually at 24 degrees C and sexually at 15 degrees C. The appearance of gonads begins 12 days after transfer from 24 degrees to 15 degrees C and is complete 35 days after the temperature transition. Testes appear before eggs. Fifty percent of the mature embryos maintained at 15 degrees C hatch by day 61, but they have a low level of survival. Fifty percent of the mature embryos pretreated for from 5 to 25 days at 4 degrees C… CONTINUE READING

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