Rapid Changes in the Phytoplankton Community of a Subtropical, Shallow, Hypereutrophic Lake During the Rainy Season
| Autor: | Ofelia Yadira Lugo-Melchor, Danielle A. Orozco-Nunnelly, Adriana Pacheco, José de Anda, Harvey Shear, Misael Sebastián Gradilla-Hernández, Carolina Senés-Guerrero, Osiris Díaz-Torres |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
Microbiology (medical) Wet season microcystin lcsh:QR1-502 Subtropics 01 natural sciences Microbiology Algal bloom cyanobacteria lcsh:Microbiology 03 medical and health sciences Phytoplankton fish mortality Original Research 030304 developmental biology 0303 health sciences geography geography.geographical_feature_category biology Ecology 010604 marine biology & hydrobiology Cylindrospermopsis microalgae fungi Endorheic basin limiting nutrient biology.organism_classification Lake Cajititlán Environmental science Water quality Eutrophication physicochemical and environmental parameters |
| Zdroj: | Frontiers in Microbiology, Vol 12 (2021) Frontiers in Microbiology |
| DOI: | 10.3389/fmicb.2021.617151/full |
| Popis: | Lake Cajititlán is a small, shallow, subtropical lake located in an endorheic basin in western Mexico. It is characterized by a strong seasonality of climate with pronounced wet and dry seasons and has been classified as a hypereutrophic lake. This eutrophication was driven by improperly treated sewage discharges from four municipal wastewater treatment plants (WWTPs) and by excessive agricultural activities, including the overuse of fertilizers that reach the lake through surface runoff during the rainy season. This nutrient rich runoff has caused algal blooms, which have led to anoxic or hypoxic conditions, resulting in large-scale fish deaths that have occurred during or immediately after the rainy season. This study investigated the changes in the phytoplankton community in Lake Cajititlán during the rainy season and the association between these changes and the physicochemical water quality and environmental parameters measured in the lake’s basin.PlanktothrixandCylindrospermopsiswere the dominant genera of the cyanobacterial community, while the Chlorophyceae, Chrysophyceae, and Trebouxiophyceae classes dominated the microalgae community. However, the results showed a significant temporal shift in the phytoplankton communities in Lake Cajititlán induced by the rainy season. The findings of this study suggest that significant climatic variations cause high seasonal surface runoff and rapid changes in the water quality (Chlorophyll-a, DO, NH4+, and NO3–) and in variations in the composition of the phytoplankton community. Finally, an alternation between phosphorus and nitrogen limitation was observed in Lake Cajititlán during the rainy season, clearly correlating to the presence ofPlanktothrixwhen the lake was limited by phosphorus and to the presence ofCylindrospermopsiswhen the lake was limited by nitrogen. The evidence presented in this study supports the idea that the death of fish in Lake Cajititlán could be mainly caused by anoxia, caused by rapid changes in water quality during the rainy season. Based on our review of the literature, this is the first study on the phytoplankton community in a subtropical lake during the rainy season using high throughput 16S rRNA and 18S rRNA amplicon sequencing. |
| Databáze: | OpenAIRE |
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