Influence of phytoplankton composition and stratification degree on gut pigment content of Ceriodaphnia sp. at dawn |
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Authors: | Echevarra, Fidel Bautista, Begoa Guerrero, Francisco Rodrguez, Valeriano |
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Affiliation: | Departamento de Biologa Animal, Vegetal y Ecologa, Facultad de Ciencias del Mar, Universidad de Cdiz 11510 Puerto Real, Cdiz 1Departamento de Ecologa, Facultad de Ciencias, Universidad de Mlaga 29071 Mlaga 2Departamento de Biologa Animal, Vegetal y Ecologa, Facultad de Ciencias Experimentales, Universidad de Jaen 23071 Jaen, Spain |
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Abstract: | Very short-term feeding activity of the cladoceran Ceriodaphniasp. was investigated in situ in a eutrophic reservoir in thesouth of Spain, using fluorimetric analysis of the gut pigmentcontent in periods when the water column was relatively mixedor strongly stratified. The results obtained in the mixed watercolumn showed a clear increase in gut pigment content at dawn,a period sampled with high frequency. The accumulation of thecladoceran at the depth of maximum concentration of phytoplankton,and the high gut pigment concentration in cladocerans at thatdepth just after dawn, suggested active feeding of Ceriodaphniaon phytoplankton at that time. During stratification, the abundanceof Ceriodaphnia was higher, but the gut pigment contents werevery low and they did not reflect any clear feeding patterns,with either time or depth. Changes in phytoplankton concentrationand composition between the relatively mixed and the stratifiedwater column suggest a shift in feeding activity from herbivorousto. |
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