Institute of Biology and Earth Sciences, University of the National Education Commission, Krakow, Podchorazych 2, 30-084 Krakow, Poland.
Littoral, Environnement et Sociétés (LIENSs), UMR 7266 CNRS - La Rochelle Université, 2 rue Olympe de Gouges, 17000 La Rochelle, France.
Sci Total Environ. 2024 Nov 25;953:175891. doi: 10.1016/j.scitotenv.2024.175891. Epub 2024 Aug 31.
Anthropogenic activity has disturbed the natural distribution and circulation of trace elements in the environment. This has led to increased background levels of numerous elements, causing global pollution. In this context, seabirds are relevant bioindicators of environmental contamination. This study focuses on the ecological factors that influence the concentrations of 14 trace elements in the blood of the chicks of three sympatric gull species from the French coast of the English Channel. Between 2015 and 2017, 174 birds were sampled in the industrialised Seine Estuary (in the city of Le Havre and on Ratier Island) and in the remote Chausey Islands, 200 km to the west. We also considered the Se:Hg molar ratio using Hg concentrations in those birds. Ag and V concentrations were below the quantification limit in all cases, while the fraction of non-quantified samples was higher than 30 % for Cd, Cr and Ni. Among the elements quantified in the samples, the lowest concentrations were noted for Co and the highest for Fe, building the following order: Co < Cd < Ni < Mn ≤ Pb < Cr < Hg < Cu < Se < As < Zn < Fe. No unanimous scheme of concentrations among elements, species and sites existed. Similarly, different models were fitted and different factors were significant for different species and elements. We observed the biomagnification of As and the biodilution of Pb. Pb concentrations were also highest in the industrial site in the city of Le Havre. Despite the high proportion of non-quantified samples for Cd, Cr and Ni, we continued to notice higher concentrations in the marine environment of the Chausey Islands. Concentrations of some elements clearly revealed habitat dependence. In some cases the Se:Hg molar ratio was lower than 4, a threshold for diminishing Hg toxicity by Se.
人为活动扰乱了环境中微量元素的自然分布和循环。这导致了许多元素背景水平的升高，造成了全球性的污染。在这种情况下，海鸟是环境污染的相关生物指标。本研究关注影响三种英吉利海峡法国海岸滨鸟雏鸟血液中 14 种微量元素浓度的生态因素。在 2015 年至 2017 年期间，在工业化的塞纳河口（在勒阿弗尔市和拉蒂耶尔岛上）和偏远的绍塞群岛（位于西部 200 公里处）采集了 174 只鸟类样本。我们还考虑了这些鸟类中 Hg 浓度的 Se:Hg 摩尔比。Ag 和 V 浓度在所有情况下均低于定量限，而未定量样品的比例对于 Cd、Cr 和 Ni 则高于 30%。在所分析的样本中，Co 的浓度最低，Fe 的浓度最高，其顺序为：Co<Cd<Ni<Mn≤Pb<Cr<Hg<Cu<Se<As<Zn<Fe。元素、物种和地点之间不存在一致的浓度模式。同样，不同的模型适用于不同的物种和元素，并且不同的因素具有显著意义。我们观察到 As 的生物放大和 Pb 的生物稀释。Pb 浓度在勒阿弗尔市的工业区也最高。尽管 Cd、Cr 和 Ni 的未定量样品比例很高，但我们仍注意到绍塞群岛海洋环境中的浓度更高。一些元素的浓度清楚地揭示了生境依赖性。在某些情况下，Se:Hg 摩尔比低于 4，这是 Se 降低 Hg 毒性的阈值。
