School of Marine Sciences, Zhuhai Key Laboratory of Marine Bioresources and Environment, Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Pearl River Estuary Marine Ecosystem Research Station, Ministry of Education, Sun Yat-Sen University, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519082, China; State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, 510275, China.
School of Marine Sciences, Zhuhai Key Laboratory of Marine Bioresources and Environment, Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Pearl River Estuary Marine Ecosystem Research Station, Ministry of Education, Sun Yat-Sen University, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519082, China.
Environ Pollut. 2024 Oct 15;359:124559. doi: 10.1016/j.envpol.2024.124559. Epub 2024 Jul 15.
Contaminant accumulation in organisms can be influenced by both biological traits and environmental conditions. However, delineating the main factors affecting contaminant burdens in organisms remains challenging. Here, we conducted an initial investigation into the impact of diet and habitat on the accumulation of short- (SCCPs) and medium-chain chlorinated paraffins (MCCPs) in Indo-Pacific humpback dolphins (2003-2020, n = 128) from the Pearl River Estuary (PRE), a highly polluted estuary in China. The detected levels of SCCPs (5897 ± 3480 ng g lw) and MCCPs (13,960 ± 8285 ng g lw) in blubber samples of humpback dolphin are the highest among recorded values marine mammals. Both SCCPs and MCCPs exhibited biomagnification factor values exceeding 1, suggesting their biomagnification potential within the dolphins and their diet. Quantitative diet analysis using the dolphin fatty acid signatures revealed that humpback dolphins inhabiting the western PRE consumed a larger proportion of carnivorous fish than those from the eastern PRE. However, spatial analysis showed that humpback dolphins in the western PRE contained lower SCCP/MCCP concentrations than those from the eastern PRE. Based on these findings we suggest that, compared to diet differences, spatial variations of SCCPs/MCCPs in humpback dolphins may be predominantly influenced by their space-use strategies, as the eastern PRE is closer to the pollutant discharge source and transfer routes.
生物体内污染物的积累既受生物特征又受环境条件的影响。然而，明确影响生物体内污染物负荷的主要因素仍然具有挑战性。在这里，我们初步研究了饮食和栖息地对珠江口（中国高度污染的河口）中华白海豚（2003-2020 年，n=128）体内短链（SCCPs）和中链氯化石蜡（MCCPs）积累的影响。在中华白海豚的鲸脂样本中，检测到的 SCCPs（5897±3480ng g lw）和 MCCPs（13960±8285ng g lw）含量是记录到的海洋哺乳动物中最高的。SCCPs 和 MCCPs 的生物放大因子值均超过 1，表明它们在海豚体内及其饮食中有生物放大的潜力。使用海豚脂肪酸特征进行定量饮食分析表明，栖息在珠江口西部的中华白海豚比栖息在东部的中华白海豚摄入了更大比例的肉食性鱼类。然而，空间分析显示，栖息在珠江口西部的中华白海豚体内的 SCCP/MCCP 浓度低于栖息在珠江口东部的中华白海豚。基于这些发现，我们认为，与饮食差异相比，中华白海豚体内 SCCP/MCCP 的空间变化可能主要受其空间利用策略的影响，因为珠江口东部更接近污染物排放源和传输途径。
