Université de Reims Champagne-Ardenne, UMR 02 SEBIO (Stress environnementaux et biosurveillance des milieux aquatiques), Reims, France; Université de Lorraine, CNRS, LIEC, F-57000, Metz, France.
Université de Lorraine, CNRS, LIEC, F-57000, Metz, France.
Environ Pollut. 2019 Feb;245:889-897. doi: 10.1016/j.envpol.2018.11.079. Epub 2018 Nov 25.
Measurements of biological responses on living organisms are essential in aquatic biomonitoring. In freshwaters, Dreissena polymorpha is an invasive bivalve commonly used in ecotoxicological studies and considered as a model organism. However, D. polymorpha abundances are declining while another species colonizes most of the freshwaters: Dreissena rostriformis bugensis. This species has already been studied in ecophysiology but there is still a lack of data concerning its responses to stressors before its use as a bioindicator of environmental pollution. This study aims to compare the responses of the two species exposed to metal stress. Responses at different levels of biological organization were targeted with measurement of sub-cellular and individual biomarkers following an exposure of up to 7 days to cadmium at 10 μg.L. At the individual level, the scope for growth (SFG) was measured. It corresponds to the energy allocated to growth and reproduction. D. polymorpha exhibits variations in biomarker measurements as well as in the SFG in presence of Cd. D. r. bugensis shows no variation in its responses at the different targeted levels. According to the present results, energy metabolism seems to have an essential role for these species when facing a metal stress. Different energy allocation strategies were evidenced between the two species, although the link with biochemical biomarkers is more evident for D. polymorpha than for D. r. bugensis.
对生物体的生物反应进行测量在水生生物监测中至关重要。在淡水中，多刺淡水螺是一种入侵双壳类动物，常用于生态毒理学研究，并被视为一种模式生物。然而，多刺淡水螺的数量正在减少，而另一种物种则在大多数淡水中大量繁殖：罗氏滨螺。该物种已经在生理生态学方面进行了研究，但在将其用作环境污染生物指标之前，对其应对胁迫的反应仍然缺乏数据。本研究旨在比较两种物种暴露在金属胁迫下的反应。通过测量暴露于 10μg/L 镉后长达 7 天的亚细胞和个体生物标志物，针对不同水平的生物组织进行了反应。在个体水平上，测量了生长范围（SFG）。它对应于分配给生长和繁殖的能量。多刺淡水螺在 Cd 存在下表现出生物标志物测量值和 SFG 的变化。罗氏滨螺在不同目标水平的反应没有变化。根据目前的结果，能量代谢似乎在这些物种面临金属胁迫时起着至关重要的作用。尽管对于多刺淡水螺来说，与生化生物标志物的联系比罗氏滨螺更明显，但两种物种之间存在不同的能量分配策略。
