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H ii regions in galaxies are the sites of star formation and thus particularplaces to understand the build-up of stellar mass in the universe. The lineratios of this ionized gas are frequently used to characterize the ionizationconditions. We use the Hii regions catalogue from the CALIFA survey (~5000 H iiregions), to explore their distribution across the classical [OIII]/Hbeta vs.[NII]/Halpha diagnostic diagram, and how it depends on the oxygen abundance,ionization parameter, electron density, and dust attenuation. We compared theline ratios with predictions from photoionization models. Finally, we explorethe dependences on the properties of the host galaxies, the location withinthose galaxies and the properties of the underlying stellar population. Wefound that the location within the BPT diagrams is not totally predicted byphotoionization models. Indeed, it depends on the properties of the hostgalaxies, their galactocentric distances and the properties of the underlyingstellar population. These results indicate that although H ii regions are shortlived events, they are affected by the total underlying stellar population. Onemay say that H ii regions keep a memory of the stellar evolution and chemicalenrichment that have left an imprint on the both the ionizing stellarpopulation and the ionized gas

Imprints of galaxy evolution on H ii regions Memory of the past uncovered by the CALIFA survey