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Rapid Colonization of Uranium Mining-Impacted Waters, the Biodiversity of Successful Lineages of Phytoplankton Extremophiles

  • Beatriz Baselga-Cervera
  • Camino García-BalboaEmail author
  • Héctor M. Díaz-Alejo
  • Eduardo Costas
  • Victoria López-Rodas
Environmental Microbiology

Abstract

Anthropogenic extreme environments are emphasized as interesting sites for the study of evolutionary pathways, biodiversity, and extremophile bioprospection. Organisms that grow under these conditions are usually regarded as extremophiles; however, the extreme novelty of these environments may have favor adaptive radiations of facultative extremophiles. At the Iberian Peninsula, uranium mining operations have rendered highly polluted extreme environments in multiple locations. In this study, we examined the phytoplankton diversity, community structure, and possible determining factors in separate uranium mining-impacted waters. Some of these human-induced extreme environments may be able to sustain indigenous facultative extremophile phytoplankton species, as well as alleged obligate extremophiles. Therefore, we investigated the adaptation capacity of three laboratory strains, two Chlamydomonas reinhardtii and a Dictyosphaerium chlorelloides, to uranium-polluted waters. The biodiversity among the sampled waters was very low, and despite presenting unique taxonomic records, ecological patterns can be identified. The microalgae adaptation experiments indicated a gradient of ecological novelty and different phenomena of adaptation, from acclimation in some waters to non-adaptation in the harshest anthropogenic environment. Certainly, phytoplankton extremophiles might have been often overlooked, and the ability to flourish in extreme environments might be a functional feature in some neutrophilic species. Evolutionary biology and microbial biodiversity can benefit the study of recently evolved systems such as uranium-polluted waters. Moreover, anthropogenic extremophiles can be harnessed for industrial applications.

Keywords

Uranium mining impacted waterbodies Phytoplankton Anthropogenic extreme environments Microbial biodiversity Facultative extremophiles Adaptation 

Abbreviations

UMIWs

uranium mining impacted water bodies

gen.

generations

Notes

Acknowledgments

ENUSA was instrumental in facilitating sampling. Pedro Caravantes, Antonio García-Sanchez, and José Mariano Igual provided invaluable assistance with sampling and chemical analyses. Thanks are given to Lara de Miguel Fernandez for her excellent technical support.

Authors’ Contributions

BB-C, CG-B, EC, and VL-R conceived and planned the experiments. BB-C and CG-B interpreted the results and worked in the manuscript, with a special interest in the conceptual model. BB-C and CG-B carried out sampling and experimentation. HMD aided in the interpretation of the results. HMD and EC performed the statistical analyses. BB-C wrote the manuscript with inputs from all authors. CG-G, EC, and VL-R supervised the project.

Funding Information

This study is supported by the Spanish Secretaría de Estado, Investigación, Desarrollo e Innovación, grant CTM-2013-44366-R.

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no conflict of interest.

Supplementary material

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High resolution image (TIF 13126 kb)

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Authors and Affiliations

  1. 1.Animal Science (Genetics), School of Veterinary MedicineComplutense University of MadridMadridSpain
  2. 2.Ecology, Evolution and Behavior DepartmentUniversity of MinnesotaSt. PaulUSA

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