Dominant phytoplankton species of the Ejidos de Xochimilco and San Gregorio Atlapulco Natural Protected Area, CDMX, Mexico, corresponding September 2018

• DOI: https://doi.org/10.22533/at.ed.813442408055

• Palavras-chave: Agua dulce, eutrofización, Fitoplancton, México, desarrollos masivos

• Keywords: Fresh water, eutrophication, Phytoplankton, Mexico, massive developments

• Abstract:

  In Mexico, knowledge of freshwater phytoplankton began in 1843 and its study has been growing gradually. Due to the contamination of water bodies, the proliferation of species has increased, so the objective of this work is to contribute to its knowledge. in the Ejidos de Xochimilco and San Gregorio Atlapulco Natural Protected Area, Mexico City. Integrated phytoplankton samples collected at eight sampling stations were obtained and fixed with Lugol at the final 1%. Subsamples of 0.1 mL were analyzed with the help of a Zeiss bright-field optical microscope. A total of 72 species and varieties belonging to five taxonomic groups were recorded: 21 to the Bacillariophyta Division, 28 to the Chlorophyta Division, 12 to the Euglenophyta Division, two correspond to the Cyanoprocaryota Division and one to the Phyrrophyta Division. 

  The dominant species were Hantzschia amphioxys, Lepocinclis acus, Ankistrodesmus falcatus, Aulacoseira granulata, Cocconeis placentula, Desmodesmus communis, Chlorella sp., Stephanocyclus meneghinianus, Leptolyngbya foveolarum, Chlorella vulgaris. No toxic events were observed.