Carbonate chemistry seasonality in a tropical mangrove lagoon in La Parguera, Puerto Rico

We investigated the seasonal carbonate chemistry variability within a semi-enclosed tropical mangrove lagoon in southwestern Puerto Rico. Biweekly measurements of seawater temperature, salinity, total alkalinity (TA), and dissolved inorganic carbon (DIC) were conducted from 2014 to 2018. We describe...

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Bibliographic Details
Published in:PLOS ONE
Main Authors: García-Troche, Erick M., Morell, Julio M., Meléndez, Melissa, Salisbury, Joseph E.
Format: Text
Language:English
Published: Public Library of Science 2021
Subjects:
Research Article
Ocean acidification
Online Access:http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8099052/
http://www.ncbi.nlm.nih.gov/pubmed/33951056
https://doi.org/10.1371/journal.pone.0250069
Description
Summary:We investigated the seasonal carbonate chemistry variability within a semi-enclosed tropical mangrove lagoon in southwestern Puerto Rico. Biweekly measurements of seawater temperature, salinity, total alkalinity (TA), and dissolved inorganic carbon (DIC) were conducted from 2014 to 2018. We describe the possible mechanisms driving the observed variability by correlating the DIC/TA ratio with pH and Ω(arg), suggesting that the mean pH (7.87 ± 0.09) and aragonite saturation state (Ω(arg), 2.96 ± 0.47) of the mangrove lagoon negatively affected calcification. The measured pCO(2) and DIC/TA ratios indicate that heterotrophic activity was the primary driver for persistent acidification, which reached its maximum expression during the wet season. We conclude that mangrove lagoons with limited seawater exchange and high carbon input will not mitigate ocean acidification.

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