Keywords
Nutrients
Autotrophic metabolism
Ecosystem health
How to Cite
Abstract
Buenavista Lagoon, located in La Guajira, Colombia, was studied to analyze its physicochemical characteristics and phytoplankton primary production. Parameters such as pH (8.6-8.8), salinity (34-36 psu), oxygen (5.5-8 mg L-1), nutrients (nitrates from 0.49-1.5 μg·L-1; phosphates from 1.6-5.1 μg·L-1) and temperature (26-27°C) were measured at two sampling stations. The lagoon exhibited typical tropical estuary conditions, with shallow depth (35-37 cm) and low transparency (photic zone 12-16 cm). Nutrient levels were high, indicating accumulation of Ranchería river´s contributions, with the lagoon acting as a reservoir. Net primary production (NPP) was high at both stations, with values from 1.7-2.6 gC·m-2·d-1, related to nutrient availability. Gross primary production (GPP) showed significant differences between stations according to the Mann-Whitney U test, with values from 2.5-3.4 gC·m-2·d-1, suggesting a production surplus. Respiration was lower than NPP. The autotrophic metabolic balance and high NPP levels evidence the ecological role of the lagoon as a nutrient source, increasing coastal productivity. It is concluded that Buenavista Lagoon presents adequate physicochemical conditions and high phytoplankton production, playing a valuable role in regional fertility.
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