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Effects of a Light Crude Oil Spill on a Tropical Coastal Phytoplankton Community

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Abstract

Oiling scenarios following spills vary in concentration and usually can affect large coastal areas. Consequently, this research evaluated different crude oil concentrations (10, 40, and 80 mg L−1) on the nearshore phytoplanktonic community in the southern Gulf of Mexico. This experiment was carried out for ten days using eight units of 2500 L each; factors monitored included shifts in phytoplankton composition, physicochemical parameters and the culturable bacterial abundance of heterotrophic and hydrocarbonoclastic groups. The temperature, salinity, and nutrient concentrations measured were within the ranges previously reported for Yucatan Peninsula waters. The total hydrocarbon concentration (TPH) in the control at T0 indicated the presence of hydrocarbons (PAHs 0.80 μg L−1, aliphatics 7.83 μg L−1 and UCM 184.09 μg L−1). At T0, the phytoplankton community showed a similar assemblage structure and composition in all treatments. At T10, the community composition remained heterogeneous in the control, in agreement with previous reports for the area. However, for oiled treatments, Bacillariophyceae dominated at T10. Hydrocarbonoclastic bacteria were associated with oiled treatments throughout the experiment, while heterotrophic bacteria were associated with control conditions. Our results agreed with previous works at the taxonomic level showing the presence of Bacillariophyceae and Dinophyceae in oil-related treatments, where these groups showed the major interactions in co-occurrence networks. In contrast, Chlorophyceae showed the key node in the co-occurrence network for the control. This study aims to contribute to knowledge on phytoplankton community shifts during a crude oil spill in subtropical oligotrophic regions.

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Acknowledgements

The authors thank the members of the technical team of the CINVESTAV-IPN Research Institute, and the Laboratorio de Biodiversidad Marina y Cambio Climático (BIOMARCCA, ECOSUR) for their support. We would like to thank R.R. Raygosa-Barahona, O. González-Yam, V. Ceja-Moreno, J. Villafuerte, C. Mané-Gutiérrez, J. Romo, L. Cetina-Euán, G.I. Cruz-Trejo, I. Osorio-Moreno, A. Gamboa-Muñoz, R. Canul-Puc, R. Ochoa-Rosado, J.A. Martínez, S.M. Morales-Ojeda, and I. Medina-Gómez for their technical support in sampling and analyses of data. Marcia M. Gowing (Seattle, WA, USA) kindly improved the English style. We also thank the anonymous reviewers for their critical comments. The research was funded by the National Council of Science and Technology of Mexico—Mexican Ministry of Energy—Hydrocarbon Trust (fondo sectorial CONACyT-SENER-Hidrocarburos), project 201441 (Sectorial Research Funds 0020SRE-CONACYT S0018). This is a contribution of the Gulf of Mexico Research Consortium (CIGoM).

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Correspondence to Sébastien Putzeys.

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Putzeys, S., Juárez-Fonseca, M., Valencia-Agami, S.S. et al. Effects of a Light Crude Oil Spill on a Tropical Coastal Phytoplankton Community. Bull Environ Contam Toxicol 108, 55–63 (2022). https://doi.org/10.1007/s00128-021-03306-4

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  • DOI: https://doi.org/10.1007/s00128-021-03306-4

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