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Eutrophic temperate and sub-tropical lakes often exhibit a marked vertical structure during the warm season thatinvolves important spatial differences of physical, chemical and biological variables. Therefore, zooplankton isexposed to a highly heterogeneous environment in the vertical dimension. In this work, We analyze the depth-distribution of the cladoceran Daphnia ambigua in the eutrophic, monomictic lake El Plateado at midday and midnight,along with its relationship with the vertical distribution of water temperature and dissolved oxygen concentration. Wealso attempt to define whether or not this population exhibits a diel vertical migration. The results show significantchanges in the day/night vertical distribution of D. ambigua during its growing season, with the exception of the lastdate. Also, the data revealed that average depth selected by D. ambigua becomes shallower with time, and the amplitudeof the vertical migration decreases throughout the season. During the period of lake stratification, temperature appearspositively correlated, and oxygen negatively correlated to the frequency of D. ambigua. It is suggested that oxygenconcentration plays a crucial role in modulating the vertical migration behavior of D. ambigua in lake El Plateado, whichhas important consequences for understanding the atypical pattern of population dynamics exhibited by this species.Key words: Chile, Daphnia, depth-selection, diel vertical migration, zooplankton.

Depth-selection patterns and diel vertical migration of Daphnia ambigua (Crustacea: Cladocera) in lake El Plateado