Thallium in spawn, juveniles, and adult common toads Bufo bufo living in the vicinity of a zinc-mining complex, PolandReport as inadecuate




Thallium in spawn, juveniles, and adult common toads Bufo bufo living in the vicinity of a zinc-mining complex, Poland - Download this document for free, or read online. Document in PDF available to download.

Environmental Monitoring and Assessment

, 187:4141

First Online: 25 November 2014Received: 25 April 2014Accepted: 03 November 2014

Abstract

A breeding population of the common toad Bufo bufo living in the vicinity of a Zn-Pb smelting works in Bukowno, Poland was studied for the presence of thallium. Tl concentration was measured in the bottom sediments of the spawning pond, in the laid eggs, in juveniles after metamorphosis, and in the selected tissues of the adult individuals. A very high concentration of Tl was detected in the spawn 13.97 ± 8.90 mg-kg d.w

In 50 % of the spawn samples, levels exceeded 20 mgTl-kg d.w. The issue of maternal transfer of thallium from females to oocytes is discussed. Due to a significant accumulation of thallium, spawn analysis can be used as a sensitive indicator of the presence of this element in the environment and may replace more invasive methods that involve the killing of adult animals. In those regions that are abundant in Zn-Pb ores, the spawn of amphibians may be a very important source of thallium contamination for predators. From among all tissues of the Bukowno adult toads, the livers have shown the highest accumulation of thallium mean 3.98 mg-kg d.w. and maximum value—18.63. For as many as 96.5 % of livers, concentrations exceeded 1.0 mgTl-kg d.w. which is treated as indicative of poisoning.

KeywordsThallium Pollution Toads Trace elements Amphibians Maternal transfer  Download fulltext PDF



Author: Krzysztof Dmowski - Monika Rossa - Joanna Kowalska - Beata Krasnodębska-Ostręga

Source: https://link.springer.com/







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