Dynamics of an autumn phytoplankton bloom in a hypereutrophic urban lake in the semiarid Pampean region (Argentina)

Authors

  • Alberto Pilati Facultad de Ciencias Exactas y Naturales, Universidad Nacional de La Pampa, Uruguay 151, 6300, Santa Rosa, La Pampa, Argentina
  • Santiago Andrés Echaniz Facultad de Ciencias Exactas y Naturales, Universidad Nacional de La Pampa, Uruguay 151, 6300, Santa Rosa, La Pampa, Argentina
  • Alicia María Vignatti Facultad de Ciencias Exactas y Naturales, Universidad Nacional de La Pampa, Uruguay 151, 6300, Santa Rosa, La Pampa, Argentina
  • Graciela Inés Bazán Facultad de Ciencias Exactas y Naturales, Universidad Nacional de La Pampa, Uruguay 151, 6300, Santa Rosa, La Pampa, Argentina
Keywords: Phenological shifts; Hypereutrophic shallow lake; Planktothrix agardhii; Zooplankton; N-limitation

Abstract

In this paper we report a rare autumm phytoplankton bloom in a shallow lake of the semiarid Pampean area of Argentina. Phytoplankton biomass peaked only once during the autumn, followed 2 months later by a chlorophyll peak. The biomass peak might have been the result of a weak grazing pressure on the phytoplankton community (dominated by the nongrazeable Planktothrix agardhii (Gomont) Anagnostidis & Komárek) coupled with a reduction in the N-limitation towards the autumm. The chlorophyll peak took place when phytoplankton cells increased their chlorophyll content probably due to a reduction of solar irradiance and low water transparency. This findings indicate that phytoplankton seasonality in this particular area may depend on multiple biotic and abiotic factors.

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Published
26-03-2020
How to Cite
Pilati, A., Echaniz, S. A., Vignatti, A. M., & Bazán, G. I. (2020). Dynamics of an autumn phytoplankton bloom in a hypereutrophic urban lake in the semiarid Pampean region (Argentina). Anales de Biología, (42), 21–30. Retrieved from https://revistas.um.es/analesbio/article/view/analesbio.42.03
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Articles