Effects of temperature, salinity and food level on the life history traits of the marine rotifer Synchaera cecilia valentina, n. subsp. |
| |
Authors: | Oltra Rafael; Todolf Rafael |
| |
Institution: | Área de Ecología, Facultad de Ciencias Biológicas Universitat de València 46100 Burjassot (Valencia), Spain |
| |
Abstract: | A strain of the marine rotifer Synchaeta cecilia valentina,n. subsp., isolated from the Hondo of Elche Spanish Mediterraneancoastal lagoon at 22 salinity, was cultured in the laboratoryin 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 cellsml1) on the life history traits of this rotifer werestudied in life tables performed with replicated individualcultures. Temperature and salinity had a significant negativeeffect (P < 0.001) on the average lifespan (LS) and on thenumber of offspring per female (R0) The effect of food levelon LS is unclear, whereas R0 is greater at 20°C with thelower concentration of algae and at 24°C with the higheralgal concentration. The maximum values of LS and R0, 5.6 daysand 9.2 offspring per female, respectively, were recorded at20°C, 25 o salinity and low food concentration. There isalso a clear negative effect on the intrinsic growth rate (r)due to salinity. The effect of temperature depends on the foodlevel and, as occurs with R0 the maximum values of r occur withthe lower algal concentration at 20°C, whereas at 24°Cthey are obtained with the higher algal concentration. Theser values, from 1.04 to 1.10 day1, were reached at 24°C,salinities of 2025 and with high food concentration. |
| |
Keywords: | |
本文献已被 Oxford 等数据库收录! |
|