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Allochthonous leaf litter is often the main resource base for invertebrate communities in ephemeral water-filled containers, and detritus quality can be affected by hydrologic conditions. The invasive mosquito  Aedes albopictus  utilizes container habitats for its development where it competes as larvae for detritus and associated microorganisms with the native  Aedes triseriatus . Different hydrologic conditions that containers are exposed to prior to mosquito utilization affect litter decay and associated water quality. We tested the hypothesis that larval competition between  A .  albopictus  and  A .  triseriatus  would be differentially affected by prior hydrologic conditions. Experimental microcosms provisioned with  Quercus alba  L. litter were subjected to one of three different hydrologic treatments prior to the addition of water and mosquito larvae: dry, flooded, and a wet/dry cycle. Interspecific competition between  A .  albopictus  and  A .  triseriatus  was mediated by hydrologic treatment, and was strongest in the dry treatment vs. the flooded or wet/dry treatments.  Aedes triseriatus  estimated rate of population change ( λ' ) was lowest in the dry treatment.  Aedes albopictus λ'  was unaffected by hydrologic treatment, and was on average always increasing (i.e., > 1).  Aedes triseriatus λ'  was affected by the interaction of hydrologic treatment with interspecific competition, and was on average declining (i.e., < 1.0), at the highest interspecific densities in the dry treatment. Dry treatment litter had the slowest decay rate and leached the highest concentration of tannin-lignin, but supported more total bacteria than the other treatments. These results suggest that dry conditions negatively impact  A .  triseriatus  population performance and may result in the competitive exclusion of  A .  triseriatus  by  A .  albopictus , possibly by reducing microbial taxa that  Aedes  species browse. Changing rainfall patterns with climate change are likely to affect competition between  A .  triseriatus  and  A .  albopictus , probably enhancing negative competitive effects of  A .  albopictus  on  A .  triseriatus  in areas that experience drought.

Prior Hydrologic Disturbance Affects Competition between Aedes Mosquitoes via Changes in Leaf Litter