Using the Daphnia model, we tested the hypothesis that individuals of the same species, but genetically different, exposed to the same chemical stress factor, are able to realize opposite life strategies - they can invest more resources in ongoing reproduction and produce newborns well prepared for a harmful condition or they can invest in their own safety and future reproductions and produce poor quality newborns. Over two generations, we differentiated females from three different clones (C1, To, Ks) by exposure to three different concentrations of sodium chloride. In the second generation, we collected detailed data on the life history of individuals: AFO (age at first ovulation in days), AFR (age at first reproduction in days), THE (time holding eggs in brood chamber), SFR (size at first reproduction), N Ne (number of first clutch neonates), Fe mass (mass of females before first reproduction), Cl mass (mass of first clutch neonates), Ne mass (mass of single neonate from first clutch), RE (reproductive effort of females), Gj (growth rate of females). Other columns in the table mean: name of clone (Clone), id of mothers (M No), id of females (No), maternal treatment (M TRT), females treatment (TRT). Treatments: H – high salt concentration, L – lower salt concentration, K – control animals.
(2023)