Temperature and age affect the life history characteristics and fatty acid profiles of Moina macrocopa (Cladocera)

Demographic responses and fatty acid profiles of Moina macrocopa were quantified under different temperature regimes (20 degrees C, 25 degrees C and 30 degrees C and diurnally variable 20-30 degrees C) and at fixed ration (10.65 mu g DWml(-1)) of Chlorella. Highest constant temperature (30 degrees C) reduced the density of M. macrocopa. The cladocerans under the fluctuating temperature regime too had lower population growth (about 50% lower than that at constant 25 degrees C). The survivorship of M. macrocopa was higher at 20 degrees C than that at 25 degrees C and 30 degrees C or at variable temperature regime. Gross and net reproductive rates were higher at 25 degrees C. At 20 degrees C, neonates had the highest proportion (67%) of myristic, palmitic and stearic acids while the adults had the lowest (26%) proportion. For both adults and neonates, palmitoleic, linoleic and linolenic comprised of 15-35% of the total fatty acids. Higher percentage (19%) of linoleic acid was present in adults than neonates (7%). Adults had linolenic acid level which was 3-times higher than in neonates. Linoleic and linolenic fatty acids decreased with increasing temperature for neonates and adults from 20 degrees C to 30 degrees C. The demographic responses and fatty acid profiles of M. macrocopa were discussed in relation to level and mode of temperature exposure. (C) 2015 Elsevier Ltd. All rights reserved.