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The microbial community in a green turtle nesting beach in the Mediterranean: application of the Biolog EcoPlate approach for beach pollution

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Abstract

This study aims to characterize the microbial community and its relationship with heavy metal pollution in the beaches of Sugözü, an important nesting site for the green turtle. Heavy metal concentrations of sand samples from subregions of Sugözü were determined using ICP-MS. The microbial community was analyzed using the Biolog® EcoPlate. The relationship between microbial catalytic activity and heavy metal levels were analyzed using canonical correspondence analysis. Levels of 27Al, 57Fe, 55Mn, and 52Cr were quite high (4332.34, 13,764.77, 590.98, and 48.21 mg/kg, respectively). The microbial community in subregions with high levels of metals was found to use carboxylic acid as a carbon source. Bioactivity, substrate utilization, diversity, and evenness values indicated negative correlations concentrations of 27Al, 56Fe, and 52Cr (−0.820, −0.508, and −0.560, respectively). It was also found that microbial diversity decreased in the subregions where heavy metal concentration increased. Embryonic deaths were found highest at early stage (0.1 to 0.2 eggs) and lowest at middle stage for whole study sites by inspecting a total 6408 eggs of 63 green turtle nests. The Biolog EcoPlate was firstly applied to determine pollution, and our findings clearly demonstrate the applicability and effectiveness of this method in assessing nesting beaches.

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Acknowledgements

We thank Fatih Fazlıoğlu, PhD., and Matthew Haworth, PhD., for linguistic advice and criticism and Sevda Türkiş, PhD., and Davut Canlı, PhD., for statistical suggestions and volunteers of Sea Turtle Conservation Project supported by BIL (BOTAŞ International Limited Co., Turkey). We also thank Seaturtle.org team for MapTool. The authors also would like to thank anonymous reviewers for their contribution to the manuscript.

Funding

This research was partially funded by Giresun University Scientific Researches Project Coordination Department (FEN-BAP-A-150219-11).

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EDC, NI, and OC conceived the study. OC provided the framework for sample collections and provided in situ documentation. EDC and NI analyzed the samples, and EDC, NI, and OC wrote the manuscript.

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Correspondence to Esra Deniz Candan.

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Not applicable. None of the experiments involved here sacrifice animals, and therefore, an approval from an institutional animal research ethics committee is not required.

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Not applicable. This manuscript does not contain any individual person’s data in any form.

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The authors declare no competing interests.

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Responsible Editor: V. V.S.S. Sarma

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Candan, E.D., İdil, N. & Candan, O. The microbial community in a green turtle nesting beach in the Mediterranean: application of the Biolog EcoPlate approach for beach pollution. Environ Sci Pollut Res 28, 49685–49696 (2021). https://doi.org/10.1007/s11356-021-14196-8

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  • DOI: https://doi.org/10.1007/s11356-021-14196-8

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