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Biochemical Responses of the Bivalve Mollusk Unio tumidus Inhabiting a Small Power Plant Reservoir on the Dniester River Basin, Ukraine

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Abstract

Hydropower plants (HPPs) can affect the hydrological regime. However, biochemical responses of aquatic animals for the evaluation of this disturbing are not applied yet. The specimens of Unio tumidus were sampled in a reservoir (R) of a small HPP as well as downstream from the dam (DS). Biochemical indexes in the digestive gland and alkali labile phosphates (ALP) in the gonads were examined. The R-mollusks showed low cholinesterase, catalase and caspase-3 activities, and metallothionein concentration, but elevated levels of zinc and copper, oxidized glutathione and protein carbonyls. Concentrations of lactate, pyruvate and ALP, activity of superoxide dismutase and glutathione S-transferase, and lipid peroxidation level were similar in both groups. Integrated biomarker response (IBR/n) index (n = 13) was 2.17 and 0.29 in the R- and DS-groups correspondingly. We suggest that using integrative biological response based on the biochemical markers of bivalve mollusks can be a valid early warning step in assessing ‘environmental flow’ impact.

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Data Availability

Experimental data, calculation of IBR, and the applied methods are available via the Mendeley Data by the following link: https://doi.org/10.17632/v5ygx7bpmc.1.

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Acknowledgements

This work has been granted by the Ministry of Education and Science of Ukraine (Projects M/70-2017, M/35-2018 and 132B for O. Stoliar). The authors are grateful to the Director of the National Nature Park Dniester Canyon Mr. Mykhaylo Shkilniuk for his assistance in the sampling in the Kasperivtsi area, to PhD St Oksana Horyn for the technical assistance in the trial and to English native biologist Dr. Inna Birchenko for the scientific editing, linguistic and phraseological improvement of this manuscript.

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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by VK, LG, VM, YR, AM, OS. The first draft of the manuscript was written by OS and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Oksana Stoliar.

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The authors declare that they have no conflict of interest. Informed consent was obtained from all individual participants included in the study.

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Khoma, V., Gnatyshyna, L., Martinyuk, V. et al. Biochemical Responses of the Bivalve Mollusk Unio tumidus Inhabiting a Small Power Plant Reservoir on the Dniester River Basin, Ukraine. Bull Environ Contam Toxicol 105, 67–75 (2020). https://doi.org/10.1007/s00128-020-02873-2

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  • DOI: https://doi.org/10.1007/s00128-020-02873-2

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