Acute Toxicity of Sodium Chloride, Nitrates, Ortho-Phosphates, Cadmium, Arsenic and Aluminum for Juveniles of the Freshwater Pearl Mussel: Margaritifera Margaritifera (L.1758)

Environments

Tiare Belamy¹  Alexia Legeay¹  Magalie Baudrimont¹  Bruno Etcheverria¹  Marie-Ange Cordier¹  Pierre-Yves Gourves¹ 

[1] University Bordeaux, UMR EPOC CNRS 5805, F-33120 Arcachon, France;

关键词: juvenile freshwater pearl mussel;    nutrients;    metals;    sensitivity;    acute toxicity test;   

DOI  :  10.3390/environments7060048

来源: DOAJ

【 摘 要 】

The freshwater pearl mussel (FWPM) Margaritifera margaritifera (L.1758) is critically endangered in Europe and ecotoxicological studies on the species are scares. Here, 96 h acute toxicity tests were conducted at 16 °C with sodium chloride (NaCl), nitrates (NO₃⁻), ortho-phosphates (PO₄³⁻), cadmium (Cd), aluminum (Al) and arsenic (As) on 13- to 28-month-old post-parasitic juveniles. The experimental protocol was developed according to conditions described in a standard guide and was modified in order to assess toxicity thresholds for the Dronne River. Results showed that juveniles were tolerant to concentrations of Al, Cd, As, PO₄³⁻, NO₃⁻ and NaCl, largely higher than those found in the Dronne river, since 96 h EC50s (effective concentrations) were >954 µg/L for Al; >110 µg/L for Cd; >127 µg/L for As; >5.01 mg/L for PO₄³⁻; between 1000 and 1500 mg/L for NO₃⁻ and were 1.19 and 1.33 g/L for NaCl. Moreover, the use of a substrate in experiments was found not to affect juvenile responses and younger juveniles seemed more sensitive than older individuals. This study thus provides new data about the tolerance of FWPM to environmental pollution and suggests that pollutant concentrations in the river are significantly lower than levels affecting them.

【 授权许可】

Unknown