Vertical migration of phytoplankton in lake Atitlan
DOI:
https://doi.org/10.54495/Rev.Cientifica.v27i1.75Keywords:
Bacillariophyta, environmental conditions, abundance, diversity, Aulacoseira sp, Ceratium spAbstract
The diel vertical migration of phytoplankton is the movement algae do in the water column as part of their lifecycle or as a result of environmental conditions. In this study we evaluate the diel vertical migration of phytoplankton in a 24-hour period in July 2015 and February 2017, to understand the vertical migration of phytoplankton in the lake. A 24-hour monitoring was carried out, recording in situ physicochemical parameters and collecting phytoplankton samples at different depths (0, 5, 10, 15, 20 and 30 m) and at different times of the day (5:00, 8:00, 12:00, 16:00, 19:00 and 22:00 hours). The most diverse taxonomic groups were diatoms (Bacillariophyta)
and green algae (Chlorophytas), and the most abundant algae were Aulacoseira sp. and Ceratium sp. In July 2015, 17 genera were registered, belonging to five taxonomic groups. During the 24-hour period evaluation a decrease in the population of diatoms was registered, also an increase of cyanobacteria around midday and an increase in dinoflagellates in the evening and night at higher depths. In February 2017, 20 genera were registered, with a dominance above 75% of diatoms. The populations of Charophytes, green algae and dinoflagellates kept stable during the day and at different depths, and cyanobacteria presented a very low abundance. In general, the observed behavior of the phytoplankton in the sampled periods was due to existing environmental conditions, particularly the photoperiod, temperature and the radiation.
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