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espanolEn este trabajo, se reporta un raro florecimiento fitoplanctonico otonal en un lago somero de la region semiarida pampeana (Argentina). La biomasa fitoplanctonica presento un solo pico otonal, seguido dos meses mas tarde por un pico en la clorofila. El pico de biomasa coincidio con un debil pastoreo sobre la comunidad fitoplanctonica (dominada por la poco pastoreada Planktothrix agardhii (Gomont) Anagnostidis & Komarek) junto con una reduccion de la limitacion por N en el otono. El pico de clorofila ocurrio cuando las algas aumentaron su contenido de clorofila probablemente debido a la reduccion de la radiacion solar y la baja transparencia del agua. Esto indicara que la estacionalidad del fitoplancton en esta area particular depende de multiples factores bioticos y abioticos. EnglishIn 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 & Komarek) 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.

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