Add to ORKGImmune traits are an important facet of an organism’s biology, as the threat of infection from pathogens is universal. We nonetheless observe a large degree of variation in measured immune traits, indicative of differences in immune investment between individuals. This thesis attempts to answer two questions around how individuals navigate immune investment. One, does mating environment impact immune investment in a species of water strider and two, is the sexual dimorphism observed in a commonly cited invertebrate immune metric related to the sexual size dimorphism commonly seen across this group? While a portion of chapter 1 could not be completed due to the pandemic, I do find evidence that water striders experience changes in mating env...