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JOURNAL OF PLANKTON RESEARCH | VOLUME 16 | NUMBER 4 | PAGES 317-335 | 1994
© Oxford University Press

research-article

Seasonal variability of phytoplankton size structure in a hypertrophic lake

Carmen Rojo and Jaime Rodríguez1

1Dept Ecología, Fac. Ciencias, Universidad de Málaga E-29071 Teatinos, Málaga, Spain Dept Microbiología (Ecología), Fac. Biología, Universidad de Valencia E-46100 Burjasot, Valencia

Received on July 14, 1993; accepted on November 30, 1993 In this paper, we describe the time dynamics of phytoplankton size-biomass spectra over a 60 week period in a hypertrophic lake (El Porcal, near Madrid, Spain). Average total phytoplankton biomass was 59.5 mg l–1, and 58 taxa were present which had between 1.8 and 38.5 µm equivalent spherical diameter (ESD). Average biomass of pico-, nano- and microplankton was 0.04, 23 and 36.2 mg l–1, respectively. The average size–biomass spectrum was characterized by a higher amount of biomass in larger cells (biomass increase as the 0.59 power of body volume). The multivariate analysis generated five conspicuous groups of normalized biomass spectra which led to understanding of global dynamics as a time sequence of size structures in the studied lake. During a long equilibrium period, normalized biomass spectra change towards less negative slopes, i.e. an increase of larger cells. During the periods with a higher frequency of perturbations, the spectra evolve towards more negative slopes (increase of smaller cells). A comparison of this study with data from other aquatic systems suggests that the size–biomass spectrum is related to trophic state. In El Porcal Lake, size–spectrum descriptions are an adequate tool in the dynamic study of the phytoplankton community.


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