Costa Cibele Rodrigues, da Costa Monica Ferreira, Barletta Mário, Alves Luís Henrique Bezerra
Laboratório de Ecologia e Gerenciamento e de Ecossistemas Costeiros e Estuarinos. Departamento de Oceanografia, Universidade Federal de Pernambuco, Av. Arquitetura, s/n, Cidade Universitária, Recife, Pernambuco, 50740-550, Brazil.
Environ Monit Assess. 2017 Nov 9;189(12):628. doi: 10.1007/s10661-017-6343-2.
Waters entering the small estuaries of the Brazilian north-east originate from drainage basins that cross semi-arid and tropical rainforest areas at various levels of use and conservation. Such rivers are often under heavy demand for water supply and other services, such as effluent dilution. The present study examines four consecutive years (2006-2009) of water quality-monitoring data divided by season (rainy and dry) just before the Goiana River enters its estuary. The environmental variables are largely controlled by rainfall patterns. The water temperatures are consistently above 25 °C, which impairs dissolved oxygen levels (3.1 to 6.7 mg L) and may suggest eutrophication. By contrast, biochemical oxygen demand, percentage O saturation and total phosphorous (which are eutrophication indicators) do not show non-compliant levels, according to local legislation. Although the monitoring stations surround a municipal centre, the estuary is downstream from this area, the main uses of which are artisanal fisheries, nature conservation, leisure and aquaculture. Therefore, continuous monitoring and long-term analysis of the resulting water quality are important.
流入巴西东北部小河口的水流源于排水流域，这些流域跨越了处于不同利用和保护水平的半干旱和热带雨林地区。这类河流对供水及其他服务（如污水稀释）的需求往往很大。本研究考察了戈亚纳河进入河口之前连续四年（2006 - 2009年）按季节（雨季和旱季）划分的水质监测数据。环境变量在很大程度上受降雨模式控制。水温持续高于25°C，这会损害溶解氧水平（3.1至6.7毫克/升），可能表明存在富营养化现象。相比之下，根据当地法规，生化需氧量、氧气饱和度百分比和总磷（这些都是富营养化指标）并未显示出超标水平。尽管监测站环绕着一个市中心，但河口位于该区域的下游，该区域的主要用途是个体渔业、自然保护、休闲和水产养殖。因此，对由此产生的水质进行持续监测和长期分析很重要。
