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Spatiotemporal variability in Terminos Lagoon (Mexico) waters during the 2009–2010 drought reveals upcoming trophic status shift in response to climate change

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Abstract

The 2009–2010 El Niño was accompanied by a severe drought strongly impacting Mexico as well as Central America, the Caribbean, and the southern USA. The present work aims at assessing how such a major climatic event impacted the hydrological typology of transitional waters in Terminos Lagoon, one of the largest shallow tropical lagoons fringing the Gulf of Mexico. Spatiotemporal inter-comparison of hydrological conditions was conducted by pairing a reference multiparametric dataset (14 hydrological parameters versus 34 sampling stations) averaged over the October 2008 to July 2010 period with each sampling occurrence dataset and running Principal Component Analyses (PCA), setting the reference-survey dataset as active variables and each sampling occurrence dataset as non-active (supplementary) variables. It revealed that the exceptional deficit in freshwater supply to the lagoon during the 2009–2010 El Niño drastically reduced hydrological diversity and lowered the trophic status of the lagoon. Short-term shifts in environmental status are common in transitional waters and responsible for temporary shifts in community structure but climate change projections show a significant long-term decrease in the freshwater discharge at the regional scale that will impact Terminos Lagoon as well as other coastal lagoons of Mexico and Central America. When combined with sea level rise, such a decrease will result in a long-term shift in hydrological conditions with a subsequent increase in salinity and a decrease in the diversity of environmental conditions affecting trophic status, will have a long-term impact on the biota.

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Acknowledgments

We are especially thankful to Instituto de Ciencias del Mar y Limnologia, Universidad Nacional Autónoma de México (ICML-UNAM) for providing access to their field station in Ciudad del Carmen, to the French Research Vessel Antea, and to the Mexican Comisión Nacional del Agua (CONAGUA) for providing online access to long-term series of river discharges and precipitation through their databases “Banco Nacional de Datos de Aguas Superficiales” (BANDAS) and “Base de datos climatologica nacional – Sistema CLICOM”, respectively.

Funding

This work was supported by the Institut de Recherche pour le Développement (IRD), the Centre National de la Recherche Scientifique (CNRS), the Université de Lille, the Universidad Autónoma Metropolitana-Iztapalapa (UAM-I), the French National Program Ecosphère Continentale et Côtière — Dynamique et Réactivité des Interfaces Littorales (EC2CO-DRIL), and the European FEDER Fund under project 1166-39417.

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Correspondence to Renaud Fichez.

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Editor: Erika Coppola

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Fichez, R., Linares, C., Chifflet, S. et al. Spatiotemporal variability in Terminos Lagoon (Mexico) waters during the 2009–2010 drought reveals upcoming trophic status shift in response to climate change. Reg Environ Change 19, 1787–1799 (2019). https://doi.org/10.1007/s10113-019-01519-2

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  • DOI: https://doi.org/10.1007/s10113-019-01519-2

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  1. Christian Grenz