Influence of phytoplankton composition and stratification degree on gut pigment content of Ceriodaphnia sp. at dawn

Very short-term feeding activity of the cladoceran Ceriodaphnia sp. was investigated in situ in a eutrophic reservoir in the south of Spain, using fluorimetric analysis of the gut pigment content in periods when the water column was relatively mixed or strongly stratified. The results obtained in the mixed water column showed a clear increase in gut pigment content at dawn, a period sampled with high frequency. The accumulation of the cladoceran...