Faculty of Natural Resources, Behbahan Khatam Alanbia University of Technology, Behbahan, Iran; Bushehr Provincial Office of the Department of Environment (DOE), Bushehr, Iran.
Faculty of Natural Resources, Behbahan Khatam Alanbia University of Technology, Behbahan, Iran; Faculty of Natural Resources, Sari Agricultural Sciences and Natural Resources University, Sari, Iran.
Mar Pollut Bull. 2020 May;154:111126. doi: 10.1016/j.marpolbul.2020.111126. Epub 2020 Apr 2.
The Persian Gulf, the most important marine ecosystem, and its islands are negatively impacted by development and pollution. Different types of pollution, especially heavy metals in these habitats, may create risks to birds, influencing reproductive performance, survival, and behaviors. Heavy metals (Cd, Pb, Cr) were analyzed in two long-lived and top food web-level sea birds, Lesser (Thalasseus bengalensis) and Greater Crested Tern (Thalasseus bergii). The research was carried out during 2018 on Nakhiloo Island, located in Dayyer-Nakhiloo Marine National Park, northeastern Persian Gulf, Iran. The nests were selected randomly, and 40 eggs of colonially-nesting terns (20 eggs T. bengalensis and 20 eggs T. bergii; a single egg per nest) were collected. The concentration of heavy metals in eggshells and egg contents was studied to investigate whether bioaccumulation varies between the eggshells and egg contents and also varies in both species. There were significant differences in the amounts of Cd between eggshell and egg content in the Greater and Lesser Crested Tern. This difference was not significant in the concentrations of Pb between the eggshell and egg content in the Tern species. Concentration of Cr did not appear to accumulate in the egg content and was below detection limit. There were significant differences in the concentrations of Cd in the eggshells and egg content between the Greater and Lesser Crested Tern. The results serve to improve understanding and to evaluate the dynamics of heavy metals in eggshells and egg content in various avian species.
波斯湾是最重要的海洋生态系统之一，其岛屿受到开发和污染的负面影响。不同类型的污染，尤其是这些栖息地中的重金属，可能会对鸟类产生风险，影响其繁殖性能、生存和行为。本研究分析了两种长寿且处于食物网顶端的海鸟——小燕鸥（Thalasseus bengalensis）和大凤头燕鸥（Thalasseus bergii）体内的重金属（Cd、Pb、Cr）。研究于 2018 年在伊朗波斯湾东北部的 Dayyer-Nakhiloo 海洋国家公园的纳基卢岛进行。随机选择鸟巢，采集了 40 枚繁殖燕鸥（20 枚小燕鸥和 20 枚大凤头燕鸥；每个鸟巢一枚蛋）的卵。研究了蛋壳和卵内容物中重金属的浓度，以调查生物积累是否在蛋壳和卵内容物之间存在差异，以及在这两个物种之间是否存在差异。大凤头燕鸥和小燕鸥的蛋壳和卵内容物中 Cd 的含量存在显著差异。在燕鸥物种的蛋壳和卵内容物中，Pb 的浓度差异不显著。Cr 似乎没有在卵内容物中积累，并且低于检测限。大凤头燕鸥和小燕鸥的蛋壳和卵内容物中 Cd 的浓度存在显著差异。该结果有助于提高对各种鸟类蛋壳和卵内容物中重金属动态的理解和评估。
