Abstract
The effect of salinity on resting egg formation and hatching in the marine rotifer Brachionus plicatilis rotundiformis (S-type Hawaiian stock) was examined in 1986. B. plicatilis was cultured at three salinity levels. The average number of resting eggs produced at 8, 16 and 32 ppt ranged from 22 to 615 per 10 000 rotifers, or 29 to 413 per 1.0x108 Tetraselmis cells. Data on the rate of mictic female appearance, fertilization and fecundity of fertilized mictic females support these findings. Results indicated that the sexual reproduction of L- and S-type rotifers have opposing responses to salinity. After preservation for 2 mo at 5°C, simultaneous hatching of resting eggs was observed at six salinity levels at 30°C. Development time was extended and hatching rate decreased when eggs formed at 8 ppt were incubated at extremely high (40 ppt) or low (1 ppt) salinities. Hatching rates varied from 69 to 93%, and were influenced by the salinity present at the time of egg formation and incubation.
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Communicated by M. Anraku, Tokyo
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Hagiwara, A., Lee, C.S., Miyamoto, G. et al. Resting egg formation and hatching of the S-type rotifer Brachionus plicatilis at varying salinities. Mar. Biol. 103, 327–332 (1989). https://doi.org/10.1007/BF00397266
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DOI: https://doi.org/10.1007/BF00397266