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JOURNAL OF PLANKTON RESEARCH | VOLUME 19 | NUMBER 6 | PAGES 693-702 | 1997
© Oxford University Press

research-article

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

Rafael Oltra and Rafael Todolf

Área de Ecología, Facultad de Ciencias Biológicas Universitat de València 46100 Burjassot (Valencia), Spain

Received on August 6, 1996; accepted on January 23, 1997 A strain of the marine rotifer Synchaeta cecilia valentina, n. subsp., isolated from the Hondo of Elche Spanish Mediterranean coastal lagoon at 22{per thousand} 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{per thousand}) 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 < 0.001) on the average lifespan (LS) and on the number of offspring per female (R0) The effect of food level on LS is unclear, whereas R0 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 R0, 5.6 days and 9.2 offspring per female, respectively, were recorded at 20°C, 25{per thousand}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 R0 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{per thousand} and with high food concentration.


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