Albayrak Serhat, Balkis Hüsamettin, Zenetos Argyro, Kurun Ayşegül, Kubanç Cüneyt
Istanbul University, Faculty of Science, Department of Biology, 34118 Vezneciler, Istanbul, Turkey.
Mar Pollut Bull. 2006 Jul;52(7):790-9. doi: 10.1016/j.marpolbul.2005.11.022. Epub 2006 Jan 18.
The macrofauna in the north Marmara Sea were identified and evaluated with univariate measures and biotic indices (BENTIX, AMBI). As expected, the diversity and species' variety decreased as the sediments became muddier and as the stress increased. The AMBI index failed to detect the spatial differentiation of the EcoQ between the sites whereas, the BENTIX index succeeded (in 70% of the cases) in producing an ecologically relevant classification reflecting the environmental pressures. Results suggested that risks of reduced species' richness and diversity from organic loading and other associated stressors in sediments should be relatively low at TOC concentrations < about 6 mg/g, high at concentrations>about 22 mg/g, and intermediate at concentrations in-between. It is suggested that these TOC critical points may be used as a general screening-level indicator for assessing the EcoQ in association with reduced biodiversity over coastal areas receiving organic wastes and other pollutants from human activities. It is further suggested that both assignment of species to ecological groups and classification scales for biotic indices (AMBI, BENTIX) for sites in the Mediterranean Sea should be readjusted so as to be closer related to environmental variables.
利用单变量测量和生物指数（BENTIX、AMBI）对马尔马拉海北部的大型底栖动物进行了识别和评估。正如预期的那样，随着沉积物变得更泥泞以及压力增加，多样性和物种种类减少。AMBI指数未能检测出各站点之间生态质量（EcoQ）的空间差异，而BENTIX指数成功地（在70%的情况下）进行了生态相关分类，反映了环境压力。结果表明，对于沉积物中有机负荷和其他相关压力源导致物种丰富度和多样性降低的风险，在总有机碳（TOC）浓度<约6毫克/克时应相对较低，在浓度>约22毫克/克时较高，在两者之间的浓度时处于中间水平。建议这些TOC临界点可作为一个通用的筛选水平指标，用于评估在接收来自人类活动的有机废物和其他污染物的沿海地区与生物多样性降低相关的生态质量。进一步建议，应重新调整地中海地区各站点生物指数（AMBI、BENTIX）的物种生态组划分和分类尺度，使其与环境变量的相关性更强。
