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A strain of the marine rotifer  Synchaeta cecilia valentina , n. subsp., isolated from the Hondo of Elche Spanish Mediterranean coastal lagoon at 22‰ salinity, was cultured in the laboratory in 20 ml test tubes and fed with the alga  Tetrasemis suecica . The effect of two temperatures (20 and 24°C), four salinities (20,25,30 and 37‰) and two food levels (15 000 and 25000 cells ml −1 ) on the life history traits of this rotifer were studied in life tables performed with replicated individual cultures. Temperature and salinity had a significant negative effect (P &lt; 0.001) on the average lifespan ( LS ) and on the number of offspring per female (R 0 ) The effect of food level on  LS  is unclear, whereas R 0  is greater at 20°C with the lower concentration of algae and at 24°C with the higher algal concentration. The maximum values of  LS  and R 0 , 5.6 days and 9.2 offspring per female, respectively, were recorded at 20°C, 25‰o salinity and low food concentration. There is also a clear negative effect on the intrinsic growth rate ( r ) due to salinity. The effect of temperature depends on the food level and, as occurs with R 0  the maximum values of  r  occur with the lower algal concentration at 20°C, whereas at 24°C they are obtained with the higher algal concentration. These  r  values, from 1.04 to 1.10 day −1 , were reached at 24°C, salinities of 20–25‰ and with high food concentration.

Effects of temperature, salinity and food level on the life history traits of the marine rotifer Synchaera cecilia valentina , n. subsp.