School of Marine Sciences, School of Life Sciences, Zhuhai Key Laboratory of Marine Bioresources and Environment, Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Sun Yat-Sen University, Zhuhai, 519000, China.
Southern Laboratory of Ocean Science and Engineering (Guangdong, Zhuhai), Zhuhai, 519000, China.
Environ Sci Technol. 2020 Oct 20;54(20):13110-13120. doi: 10.1021/acs.est.0c02299. Epub 2020 Oct 8.
We examined spatiotemporal trends of diet compositions and their relationship with pollutant accumulation levels in 46 weaning Indo-Pacific humpback dolphins ( = 46) from 2004 to 2017 in the Pearl River Estuary (PRE) based on blubber fatty acid signatures using quantitative fatty acid signature analysis in R (QFASAR). Fifty-one potential prey species were tested, among which 13 had a mean relative proportion greater than 1% in dolphin diets. Bombay duck was the predominant prey species, followed by Dussumier's thryssa and mullet, whereas other prey species were present at considerably reduced proportions in diets. The proportion of larger fishes (Bombay duck and mullet) in the diet has exhibited a significant decreasing trend in recent years, whereas the smaller fish (Dussumier's thryssa) steadily increased over the whole period, possibly due to the severe impacts of climate change and other human stressors on large fishes in estuarine waters. The proportions of Bombay duck in the diet were significantly and positively correlated with hepatic Cr levels in dolphins, whereas the temporal change in Bombay duck consumption mirrored that in the hepatic levels of several per- and polyfluoroalkyl substances, because Bombay duck was the most contaminated species among all the prey fishes.
我们使用 R 中的定量脂肪酸特征分析（QFASAR），根据鲸脂脂肪酸特征，检查了 2004 年至 2017 年间在珠江口（PRE）的 46 头断奶期印度洋-太平洋驼背豚（=46）的饮食成分的时空趋势及其与污染物积累水平的关系。测试了 51 种潜在的猎物物种，其中 13 种在海豚饮食中的平均相对比例大于 1%。母鸭是主要的猎物物种，其次是 Dussumier's thryssa 和鲻鱼，而其他猎物物种在饮食中存在的比例明显降低。饮食中大鱼（母鸭和鲻鱼）的比例近年来呈显著下降趋势，而小鱼（Dussumier's thryssa）在整个期间则稳步增加，这可能是由于气候变化和其他人为压力源对河口水域大型鱼类的严重影响。母鸭在饮食中的比例与海豚肝脏中的铬含量呈显著正相关，而母鸭的消费变化与几种全氟和多氟烷基物质的肝脏水平变化一致，因为母鸭是所有猎物鱼类中受污染最严重的物种。
