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Thallium accumulation in different organisms from karst and lowland rivers of Croatia under wastewater impact

Mijošek, Tatjana; Filipović Marijić, Vlatka; Dragun, Zrinka; Ivanković, Dušica; Krasnići, Nesrete; Redžović, Zuzana; Veseli, Marina; Gottstein, Sanja; Lajtner, Jasna; Sertić Perić, Mirela; Matoničkin Kepčija, Renata; Erk, Marijana (2020) Thallium accumulation in different organisms from karst and lowland rivers of Croatia under wastewater impact. Environmental Chemistry, 17 (2). pp. 201-212. ISSN 1448-2517

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The aim of the present research was to investigate the bioaccumulation of Tl, technology-critical element, in fish intestine and muscle, gammarids and fish intestinal parasites, acanthocephalans, and to evaluate their potential as indicators of metal exposure in the aquatic environments. Moreover, total and cytosolic (metabolically available and potentially toxic fraction) Tl concentrations were measured and compared between intestine of brown trout (Salmo trutta Linnaeus, 1758) from the karst Krka River and Prussian carp (Carassius gibelio Bloch, 1782) from the lowland Ilova River. Since there is a scarcity of information on subcellular metal partitioning in the fish intestine, results on Tl concentrations in digested intestinal tissue, homogenate and cytosol represent preliminary data on Tl diet borne uptake in salmonid and cyprinid fish. In both rivers, samplings were performed upstream (reference site) and downstream (contaminated site) of the wastewater impact in autumn and spring. Total Tl concentrations were much higher in brown trouts than Prussian carps, as well as proportions of cytosolic Tl concentrations in intestinal tissue of brown trout (45-71%) than Prussian carp (32-47%), both showing species- and site-specific differences. Considering different bioindicator organisms, the most effective Tl accumulation was evident in acanthocephalans compared to the fish tissues and gammarids, confirming the potential of fish parasites as bioindicators of metal exposure. Trends of spatial and temporal Tl variability were mostly comparable in all indicator organisms and of total and cytosolic Tl concentrations in intestine of salmonid and cyprinid fish species, confirming their application as useful biological tools in metal exposure assessment.

Item Type: Article
Additional Information: This study was supported by the Croatian Science Foundation, within the project `Accumulation, subcellular mapping and effects of trace metals in aquatic organisms' AQUAMAPMET (IP-2014-09-4255). The authors are also grateful to the members of the Laboratory for Aquaculture and Pathology of Aquatic Organisms from the RuXer Bos.kovic ' Institute for help with the field work.
Uncontrolled Keywords: Ecotoxicology ; Trace metals ; Bioaccumulation
Subjects: NATURAL SCIENCES > Chemistry
NATURAL SCIENCES > Interdisciplinary Natural Sciences
Divisions: Division for Marine and Enviromental Research
Project titleProject leaderProject codeProject type
Akumulacija, unutarstanično mapiranje i učinci metala u tragovima u akvatičkih orbganizama-AQUAMAPMETMarijana ErkIP-2014-09-4255HRZZ
Depositing User: Tatjana Mijošek
Date Deposited: 28 Jul 2020 12:39
DOI: 10.1071/EN19165

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