Çinar Melih Ertan, Bakir Kerem
Ege University, Faculty of Fisheries, Dept. of Hydrobiology, 35100 Bornova, İzmir, Turkey.
Ege University, Faculty of Fisheries, Dept. of Hydrobiology, 35100 Bornova, İzmir, Turkey.
Mar Pollut Bull. 2014 Oct 15;87(1-2):171-179. doi: 10.1016/j.marpolbul.2014.07.061. Epub 2014 Aug 11.
Biotic indices are mainly aimed at assessing levels of deterioration caused by chemical or organic pollution. However, no biotic index to date has been developed to detect impacts of alien species on benthic communities. In this paper, a new biotic index, namely ALEX, is proposed to address the objectives of the Water Framework Directive and was tested in Mersin Bay (Levantine Sea, Turkey). Species were divided into four biogeographic groups, namely native species, casual species, established species and invasive species, and the metric considers the relative importance of these groups in samples. The index classified the ecological status of some stations which are shallow, and close to harbor and river mouths as bad or poor in February and October. The ALEX values were positively and significantly correlated with total nitrogen, silicate and silt percentage in sediment, and negatively correlated with depth and the distance from the harbor.
生物指数主要旨在评估由化学或有机污染导致的恶化程度。然而，迄今为止尚未开发出用于检测外来物种对底栖生物群落影响的生物指数。本文提出了一种新的生物指数，即ALEX，以实现《水框架指令》的目标，并在梅尔辛湾（土耳其黎凡特海）进行了测试。物种被分为四个生物地理组，即本地物种、偶见物种、定居物种和入侵物种，该指标考虑了这些组在样本中的相对重要性。该指数将2月和10月一些浅水区、靠近港口和河口的站点的生态状况分类为差或极差。ALEX值与沉积物中的总氮、硅酸盐和淤泥百分比呈显著正相关，与深度和离港口的距离呈负相关。
