Abstract
The anostracan, Chirocephalus diaphanus Pr?vost, 1803 presents variation in the timing of hatching, since embryos can fall free of the shell and remain in a quiescent state in a small cocoon formed by the hatching membrane. The co-occurrence of free-swimming and quiescent nauplii in a spring hatching was investigated by comparing the cyst behaviour of two local populations colonizing a short- and a long-lived mountain pool. In each pool, a constant number of ovigerous females was collected at the beginning and end of their life cycle. Immediately after deposition, the cysts were removed, counted, and subsequently stored in the laboratory for hatching tests. There were significant differences between the two biotopes in the frequency of pre-hatched nauplii. This confirms the ecological importance of the state of suspended development referred to as quiescence, suggesting that it plays a fundamental role in microevolutionary processes in Anostraca.
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