Abstract
Abstract Longitudinal (uplake–downlake) density gradients of age-0 gizzard shad Dorosoma cepedianum were common but inconsistent within and among years in four of five large (980–22,460-ha) Missouri reservoirs during 1992–1995. These densities were generally greater in uplake than in downlake areas in four reservoirs, but density gradients were not apparent in one reservoir that was altered by a thermal effluent discharged into a midlake area. Distribution of gizzard shad could not be attributed to temporal and spatial variation in water temperature, water clarity, or zooplankton density. Variable longitudinal gradients of gizzard shad density will complicate a mechanistic understanding of density effects on trophic relations in reservoirs and the development of sampling designs.
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