Planktothrix agardhii (Gomont) Anagnostidis&Komarek (1988) bloom in Yahuarcocha lake hypereutrophic

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María de Lourdes Guerra Cabezas
Miriam Steinitz-Kannan
Teresa Vegas Vilarrúbia

Abstract

Yahuarcocha, and its watershed have undergone a series of transformations over time. Much of the surrounding area has been and is used for agriculture. In 1972, an automobile racing track was built around the lake, which generated an urban zone destined basically for tourism and hotels.  In addition to the anthropogenic influence, the area has historically suffered from periods of rain and drought, which have had an impact on the lake's dynamics.  In 1977-78, the first limnological studies were carried out; the plankton consisted mainly of Chlorophyceae, Euglenophyceae and diatoms, with a small amount of cyanobacteria.  In those studies, blooms of Euglena sanguinea were evidenced in times of drought; events that turned the water red.  Since 2014, lake studies have found mainly blooms of the cyanobacteria Raphydiosis raciborskii.  Our studies of plankton collected in the years 2020 and 202a, in the dry and rainy season, show strong blooms of the cyanobacteria Planktothrix agardhii (Gomont) Anagnostidis & Komarek 1988. This was confirmed by metagenome analysis in 2021. This cyanobacteria can potentially impact the surrounding population including tourism.

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1.
Guerra Cabezas M de L, Steinitz-Kannan M, Vegas Vilarrúbia T. Planktothrix agardhii (Gomont) Anagnostidis&Komarek (1988) bloom in Yahuarcocha lake hypereutrophic. REMCB [Internet]. 2023May25 [cited 2024Jul.3];44(1). Available from: https://remcb-puce.edu.ec/remcb/article/view/958
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