Parental and personal experience drive personality formation and individual niche diversification in group-living...

The idea of individual niche specialization suggests that individuals should diversify in their realized niches to mitigate inter-individual conflict. We tested the hypothesis that parental and early-life diet experiences drive individual foraging specialization and animal personality formation in plant-inhabiting predatory mites Phytoseiulus persimilis and Phytoseiulus macropilis. Both species are specialized predators of herbivorous spider mites. Adult females and males, whose parents had been exposed to either prey eggs or mobile prey, and/or who themselves had experienced either eggs or mobile prey during juvenile development, were tested for their prey life stage preference, and exploration and activity patterns. Parental and/or personal experience of a given prey life stage exerted species- and sex-dependent effects on the adult predators' mean and individual foraging phenotypes, with parental plus early-life effects being the strongest. Repeatability in activity and exploration was linked to prey life stage preference, pointing at co-variation of personality formation and individualized foraging niches.