Laboratório de Ecologia de Águas Continentais, Departamento de Ecologia e Zoologia, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Campus Universitário s/n, Trindade, Florianópolis, SC, CEP. 88040-970, Brazil.
Environ Monit Assess. 2011 Oct;181(1-4):347-61. doi: 10.1007/s10661-010-1833-5. Epub 2010 Dec 30.
Coastal lagoons are ecologically and economically important environments but a relative low number of studies were carried out in subtropical and permanently closed coastal lagoons. The present study aimed at assessing the temporal and spatial dynamic of trophic relevant water quality parameters in the small, deep and freshwater Peri coastal lagoon, South Brazil. During the 19 sampled months (March/2008-September/2009) spatial homogeneity (horizontal and vertical) was registered in all seasons for all variables, a condition related to the strong wind influence and low human occupation in the lagoon watershed. Seasonal variations of the water quality could be observed and they can be explained mainly by variation on temperature, wind forces and direction and rainfall, characteristic from the subtropical weather. Comparing this study with two others conducted in Peri lagoon in 1996 and 1998, no critical differences that evidence alteration in the water quality were found, but climate differences may have influenced in some small variations observed. The use of four trophic state indices indicated that indices designed for temperate lakes are inappropriate for the subtropical Peri lagoon. The lagoon was classified as oligotrophic for nutrients concentrations and meso-eutrophic for transparency and chlorophyll-a, which can be explained by the high densities and monodominance of the cyanobacterium Cylindrospermopsis raciborskii and the high recycling rates observed in warmer water bodies, when compared to the temperate ones.
滨海泻湖具有重要的生态和经济意义，但在亚热带和永久性封闭的滨海泻湖中，相关研究相对较少。本研究旨在评估巴西南部小型、深内陆淡水滨海泻湖营养相关水质参数的时空动态。在 19 个月的采样期间（2008 年 3 月至 2009 年 9 月），所有变量在所有季节均呈现出空间均一性（水平和垂直），这与泻湖流域强风和低人类活动的影响有关。可以观察到水质的季节性变化，这些变化主要可以归因于温度、风和降雨量的变化，这些变化是亚热带天气的特征。将本研究与 1996 年和 1998 年在 Peri 泻湖进行的另外两项研究进行比较，没有发现表明水质发生变化的关键差异，但气候差异可能对观察到的一些小变化产生了影响。使用四个营养状态指数表明，为温带湖泊设计的指数不适合亚热带的 Peri 泻湖。该泻湖的营养物质浓度呈寡营养型，透明度和叶绿素 a 呈中营养型，这可以用蓝藻 Cylindrospermopsis raciborskii 的高密度和单优势种以及在温暖水体中观察到的高再循环率来解释，与温带水体相比，温暖水体的再循环率更高。
