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JOURNAL OF PLANKTON RESEARCH | VOLUME 16 | NUMBER 10 | PAGES 1441-1447 | 1994
© Oxford University Press

other

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

Fidel Echevarrìa, Begoña Bautista1, Francisco Guerrero2 and Valeriano Rodrìguez1

Departamento de Biología Animal, Vegetal y Ecología, Facultad de Ciencias del Mar, Universidad de Càdiz 11510 Puerto Real, Càdiz 1Departamento de Ecología, Facultad de Ciencias, Universidad de Málaga 29071 Málaga 2Departamento de Biología Animal, Vegetal y Ecología, Facultad de Ciencias Experimentales, Universidad de Jaen 23071 Jaen, Spain

Received on February 10, 1994; accepted on May 23, 1994 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 at the depth of maximum concentration of phytoplankton, and the high gut pigment concentration in cladocerans at that depth just after dawn, suggested active feeding of Ceriodaphnia on phytoplankton at that time. During stratification, the abundance of Ceriodaphnia was higher, but the gut pigment contents were very low and they did not reflect any clear feeding patterns, with either time or depth. Changes in phytoplankton concentration and composition between the relatively mixed and the stratified water column suggest a shift in feeding activity from herbivorous to.


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