Evidence of sewage input to inner shelf sediments in the NE coast of Brazil obtained by molecular markers distribution.
Evidence of sewage input to inner shelf sediments in the NE coast of Brazil obtained by molecular markers distribution.
复制标题
DOI：
10.1016/j.marpolbul.2014.11.011
复制
发表时间：
2015-01
影响因子：
5.8
通讯作者：
R. Carreira;A. Albergaria-Barbosa;M. L. P. M. Arguelho-M.-L.-P.-M.-Arguelho-15624682;C. A. Garcia
中科院分区：
文献类型：
--
作者：
R. Carreira;A. Albergaria-Barbosa;M. L. P. M. Arguelho-M.-L.-P.-M.-Arguelho-15624682;C. A. Garcia
粪甾烷醇（5β-胆甾烷-3β-ol）和其他粪便类固醇被用作标记物，以追踪污水流入巴西东北部塞尔希培州和阿拉戈斯州沿岸大陆架的情况。陆架浅层区域（<50 m 深度）的表面沉积物样本是在四个河流系统附近收集的，这些系统的流域表现出不同程度的人类影响。在受塞尔希培河影响的地区观察到最高的粪甾烷醇浓度（58.6 ± 74.6 ng g−1；最大值为 184.1 ng g−1），而在瓦扎-巴里斯河（18.9 ± 23.6 ng g−1）和皮奥伊/雷亚尔河（12.3 ± 6.7 ng g−1）河流中粪甾烷醇浓度最高接近该方法的检测限。在巴西东北部最大的圣弗朗西斯科河附近，几乎不存在粪甾烷醇。本研究的结果在基于粪甾烷醇的诊断比率的支持下表明，当沿海地区缺乏卫生设施时，即使像塞尔希培河这样的小型河流也可以有效地将污水中产生的有机物输出到研究区域的内陆架。
Coprostanol (5β-cholestan-3β-ol) and other fecal steroids were used as markers to trace the input of sewage to the shelf along the coast of Sergipe and Alagoas States, in NE Brazil. Surface sediment samples in shallow regions (<50 m depth) on the shelf were collected adjacent to four fluvial systems, whose drainage basins exhibit distinct levels of human influence. Highest coprostanol concentrations were observed in the area under influence of the Sergipe River (58.6 ± 74.6 ng g−1; maximum of 184.1 ng g−1), whereas in the Vaza-Barris (18.9 ± 23.6 ng g−1) and the Piaui/Real (12.3 ± 6.7 ng g−1) rivers the levels of coprostanol were near the method’s limit of detection. Nearby the São Francisco River, the largest in the NE Brazil, coprostanol was virtually absent. The findings of the present study, supported by coprostanol-based diagnostic ratios, revealed that, when sanitation is lacking in the coastal region, even a small-sized river like the Sergipe River can effectively contribute to the export of sewage-derived organic matter to the inner continental shelf in the studied region.