Independent Scholar.
Escuela de Ciencias Básicas Tecnología e Ingeniería-ECBTI, Universidad Nacional Abierta y a Distancia-UNAD, Palmira, Colombia.
Water Environ Res. 2022 Jul;94(7):e10752. doi: 10.1002/wer.10752.
Changes in fauna and abiotic factors in estuaries are a consequence of their exploitation; thus, bivalve mollusks, as they filter, are widely used as environmental bioindicators. The aim of this study was to analyze the existence of seasonal variation in the concentration of total coliforms (TC) and thermotolerant coliforms (Ct), in addition to correlating the data obtained with the salinity and temperature in collection areas of Mytella falcata and the soft tissue cultivated in the Estuarine Complex of Cananéia. Two biweekly samples of water and tissue were taken, for 12 consecutive months, in nine cultivation areas of M. falcata. The analysis of the water samples showed that the Fisheries Institute, Mosquiteiro, and Itapitangui have high TC densities, with respective annual averages of 772.22, 592.67, and 563.75 most probable number (MPN).100 ml . The highest concentrations of TC and Ct occurred in the summer, in most areas. There was a decrease in both TC and Ct with increasing salinity. However, there was an increase in Ct with increasing temperature. The soft tissue showed TC densities from 9 to 26 MPN.100 ml and Ct densities from 6 to 14 MPN.100 ml , displaying the highest counts in the summer. Places where coliforms were found in high concentrations could indicate contamination, because Ct do not support higher salinities for a long time. PRACTITIONER POINTS: The general mean was 77.64 (total coliforms) and 39.35 (thermotolerant) MPN.100 ml . Annual average (thermotolerant) exceeded the permitted Brazilian limit in five points. Higher concentrations of total and thermotolerant coliforms occurred in the summer. In mollusk's tissue, concentrations of thermotolerant were 6.30 to 26.16 MPN.100 g . Coliforms' MPN varied with increasing salinity and temperature.
由于河口的开发利用，其动物群和非生物因素发生了变化；因此，滤食性双壳贝类被广泛用作环境生物标志物。本研究旨在分析总大肠菌群 (TC) 和耐热大肠菌群 (Ct) 浓度是否存在季节性变化，并将所得数据与 Mytella falcata 的采集区域的盐度和温度以及在 Cananéia 河口复合体中养殖的软体组织相关联。在 12 个月的时间里，每两周从 9 个 M. falcata 的养殖区采集两次水样和组织样。水样分析表明，渔业研究所、Mosquiteiro 和 Itapitangui 的 TC 密度较高，年平均分别为 772.22、592.67 和 563.75 最可能数 (MPN)100 ml。TC 和 Ct 的最高浓度出现在大多数地区的夏季。TC 和 Ct 随着盐度的增加而减少。然而，Ct 随着温度的升高而增加。软体组织的 TC 密度为 9 至 26 MPN.100 ml，Ct 密度为 6 至 14 MPN.100 ml，夏季计数最高。在高浓度发现大肠菌群的地方可能表明受到了污染，因为 Ct 不能长时间支持较高的盐度。从业人员要点：总大肠菌群的平均值为 77.64（总大肠菌群）和 39.35（耐热大肠菌群）MPN.100 ml。耐热大肠菌群的年平均值超过了巴西允许的 5 个限值。夏季总大肠菌群和耐热大肠菌群的浓度较高。在软体动物组织中，耐热大肠菌群的浓度为 6.30 至 26.16 MPN.100 g。大肠菌群的 MPN 随盐度和温度的增加而变化。
