The morphological and life-history data of two Daphnia species under different fish kairomone concentrations

Daphnia species can avoid predation by sensing fish kairomones and producing inducible defenses by altering the phenotype. However, the inducible response mechanisms of different Daphnia species to fish kairomones remain unclear. In this study, the morphological and life history strategy of two Daphnia species (Daphnia pulex and Daphnia sinensis) exposed to Aristichthys nobilis kairomones were studied. In the presence of fish kairomones, the two Daphnia species exhibited significantly smaller body length at maturity, smaller body length of offspring at the 10th instar, and longer relative tail spine of offspring. Nevertheless, other morphological and life history traits of the two Daphnia species differed. D. pulex showed a significantly longer relative tail spine length and shorter age at maturity after exposure to fish kairomones. The total offspring number of D. sinensis exposed to fish kairomones was significantly higher than that of the control group, whereas that of D. pulex was s..., , , # The morphological and life-history data of two Daphnia species under different fish kairomone concentrations

Data on morphological and life-history traits of two *Daphnia* species under different fish kairomone concentration treatments are given in “Morphological and life-history traits of two *Daphnia* species.xlsx”. In this table, “n/a” indicates a non-experimental fracture of the *Daphnia* tail spine during the experiment, invalidating the data.

 Data on morphological traits of offspring are given in “Morphological traits of offspring.xlsx”.

 Data on the intrinsic rate of the increase (*r*) of two *Daphnia* species are given in “The intrinsic rate of the increase (r) of two *Daphnia* species.xlsx”, where *x* is the age class (d), *lx* is the probability of surviving to age *x*, and *mx* is the fecundity at age *x*, and *r* is the intrinsic rate of the increase for the population (/d).