Resumen

SALCEDO-GARDUNO, M.G. et al. Influence of physicochemical parameters on phytoplankton distribution in the lagoon system of Mandinga, Mexico. Revista bio ciencias [online]. 2019, vol.6, e427.  Epub 02-Oct-2020. ISSN 2007-3380.  https://doi.org/10.15741/revbio.06.e427.

Coastal systems in Mexico shelter a variety of wildlife, the distribution of phytoplankton will depend on the relationship of physicochemical parameters, availability of nutrients and the presence of phytoplankton species that control primary productivity. The objective of this work was to determine the abundance of diatoms and dinoflagellates, and their relationship with physicochemical parameters, such as nitrates, phosphates, silicates and chlorophyll-a in the lagoon system of Mandinga, located on Mexico’s coast. Sample collection was performed monthly at five sites during North winds and dry seasons, showing the following results: maximum temperature values of 29.1±0.8 °C, salinity of 31.0±2.2 psu, dissolved oxygen levels 9.3±1.3 mg L-1. Plus, the concentration of chlorophyll-a was 14.6±5.6 mg m-³ in April, 2012; maximum monthly means for nitrate, silicate and phosphates were of 20.3±44.9, 256.2±25.2 and 2.9±4.2 µM, respectively. In regards of the physicochemical parameters, they were mainly recorded during March and April, 2012. Where forty-seven microalgae, thirty-one genera and sixteen species were identified; sorting in that time four dinoflagellates and twenty-seven diatoms. Given the above, it is important to mention that, some genera were known to produce Harmful Algal Blooms (HABs), including Pseudo-nitzschia. Canonical-Correlation Analysis (CCA) showed that the abundance and distribution of phytoplankton in the lagoon system of Mandinga accounted for 62.67 % of the variance (p = 0.0001) in the physicochemical parameters, such as silicates, dissolved oxygen, salinity and temperature.

Palabras llave : Coastal lagoons; diatoms; dinoflagellates; HABs; Pseudo-nitzschia.

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