gradients. Yet the degree to which genes and pathways can contribute to an organism's
fitness on such complex and variable natural resource landscapes remains poorly
understood. Here, we determine the gene‐by‐gene fitness of a generalist saprophytic
marine bacterium (Vibrio sp. F13 9CS106) on complex resources derived from its natural
habitats–copepods (Apocyclops royi) and brown algae (Fucus vesiculosus)–and as …