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JOURNAL OF PLANKTON RESEARCH | VOLUME 7 | NUMBER 4 | PAGES 473-486 | 1985
© Oxford University Press

research-article

Variability of filter structures in eight Daphnia species: mesh sizes and filtering areas

Heinz Brendelberger1 and Walter Geller

Limnologisches Institut der Universität Konstanz D-7750 Konstanz, FRG 1Max-Planck-Institut für Limnologie Postfach 165, D-2320 Plön, FRG

Received on May 1, 1984; accepted on March 1, 1985 The morphology of the filtering apparatus of eight Daphnia species (62 individuals of all size classes) was investigated by scanning electron microscopy. In the majority of animals the intersetular distances (=mesh sizes) showed a normal distribution and the mean values were between 0.2 and 1.0 µm. The total filtering area increased approximately proportionally to the second power of the body length. Absolute values were bctwecn 0.063 and 2.6 mm2, with open portions of between 64% and 77% of the total area. In the relationship between mesh size and filtering area three types of allometric growth can be distinguished: (i) with increasing body length the mesh size remains small, but filtering area (FA) increases considerably (D. magna); (ii) both mesh size and FA increase with body length (D. pulicaria); and (iii) FA remains small but the mean mesh size becomes larger (D. cucullata).


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